To see the other types of publications on this topic, follow the link: FMCW.
Dissertations / Theses on the topic 'FMCW'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'FMCW.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Icoz, Dilsad. "Milimeterwave Fmcw Radar Design." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611385/index.pdf.
Full textAbstract:
In traffic radar system, Frequency Modulated Continuous Wave (FMCW) will be used since these radars are preferred in short distance and high range resolution systems.
The system to be constructed is not only a system operating with Doppler principle and detection of speedon the contrary a functional radar is planned to be produced. In various traffic radars in use, Doppler shift constituted by the targets causing high reflection within detection field is measured and the measured speed corresponding to this shift is seen to exceed the limits. In case of cars more than one, their speeds cannot be measured separately. In this FMCW Radar system, it is possible to identify the targets&rsquo
distance and speed. The speed information of the target will be specified by Doppler frequency and also as a result of position monitoring, the speed will be determined out of the position change occurring in the unit time. These features, in multi lane road, will be used both for different lanes and also for the cars moving at the same lane but in different ranges. The radar system designed in this study is an easy to use, low power consuming device which can be mounted into the car. Only the active part of the system is off the shelf products and the other RF cards are designed and produced. As a result, a low cost traffic radar will be produced
2
Brkic, Haris. "FMCW RFID backscatter localization." Thesis, Massachusetts Institute of Technology, 2021. https://hdl.handle.net/1721.1/130682.
Full textAbstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2021Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 47-48).
Due to applications in supply chain management, virtual reality, and asset tracking, there has been an increasing interest in accurate localization and motion tracking using radio-frequency identification (RFID) tags. In this thesis, we explore a one-shot radio-frequency identification based localization and motion tracking approach with high accuracy, low latency, and whose cost is much lower than the current state-of-the-art. We propose an implementation that uses frequency-modulated continuous-wave radar for backscatter channel estimation. Overall, our system contributes improvements in the sampling rate and cost of the current state-of-the-art one-shot estimation systems.
by Haris Brkic.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
3
Vural, Aydin. "Fmcw Radar Altimeter Test Board." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1219526/index.pdf.
Full textAbstract:
In this thesis, principles of a pulse modulated frequency modulated continuous wave radar is analyzed and adding time delay to transmitted signal in the laboratory environment performed. The transmitted signal from the radar has a time delay for traveling the distance between radar and target. The distance from radar to target is more than one kilometers thus test of the functionality of the radar in the laboratory environment is unavailable.
The delay is simulated regarding to elapsed time for the transmitted signal to be received. This delay achieved by using surface acoustic wave (SAW) delay line in the laboratory environment. The analyses of the components of the radar and the delay line test board are conducted.
4
Eriksson, Oscar. "Filterdesign och hårdvarukonstruktion för FMCW-radar." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7988.
Full textAbstract:
Den här högskoleavhandlingen beskriver designen av ett IF-filter samt hårdvarukonstruktion av en ny 77 GHz FMCW-radar demonstrator. Syftet med demonstratorn är att illustrera hur kisel germanium-, SiGe, teknologi kan användas istället för den mer vedertagna men dyrare gallium arsenik-, GaAs, teknologin. Den gamla radar-prototypen vilken Acreo AB utvecklat är funktionell men behöver konstrueras om för att bättre kunna utvärdera radarprestandan. I avhandlingen presenteras grundläggande radarteori och ekvationer för att underlätta förståelsen av de olika systemblocken. Rapporten beskriver också systemarkitekturen och hur dess funktionalitet kommer att testas. Det omdesignade IF-filtret har simulerats i en PSpice-simulator och ett prototypkort av detta har tillverkats för mätningar. Ett 4-lagers kretskort av hela systemet har tagits fram i Orcad Layout. Slutligen innehåller rapporten förslag på förbättringar till nästa demonstratorversion.
This bachelor thesis describes the design of an IF-filter and the hardware construction of a new version of a 77 GHz FMCW-radar demonstrator. The purpose of the demonstrator is to illustrate how the silicon germanium-, SiGe, technology could be used instead of the more conventional but also much more expensive gallium arsenide-, GaAs, technology. The old radar prototype that Acreo AB has developed is fully functional but needs to be redesigned to be able to evaluate the radar performance in a better way. The thesis presents the basic radar theory and equations to help understanding the construction of the system blocks. The report also describes the system architecture and how its functionality should be tested. The redesigned IF-filter has been simulated in a PSpice simulator and a prototype has been manufactured and measured. A 4-layer PCB-board of the whole system was done in Orcad Layout. Finally the report is concluded with suggestions on improvements for the next demonstrator version.
5
Kurt, Sinan. "Range Resolution Improvement Of Fmcw Radars." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608808/index.pdf.
Full textAbstract:
Frequency Modulated Continuous Wave (FMCW) radar has wide application areas in both civil and military use. The range resolution is a critical concept for these FMCW radars as for the other radar types. There are theoretical restrictions in the range resolution. In addition, the non-ideal properties of the modules used in the systems negatively affects the range resolution. The transmitter leakage, non-linear frequency sweep, FM to AM distortion and measurement errors are some of the critical non-ideal properties. The problems arising from these non-ideal properties further restrict the range resolution of FMCW radars. Another important concept for the range resolution that can be obtained from FMCW radars is the signal processing method. This thesis deals with the non-ideal properties of the system modules and techniques to reduce their effects on the range resolution. Furthermore, the signal processing methods used for FMCW radar signals and the possible improvement techniques for these methods are discussed. Moreover, a simple signal processing unit called zero crossing counter which can be used for short range FMCW radars is implemented and range resolution performance of this zero crossing counter is investigated by carrying out measurements on a prototype FMCW radar at 2200MHz.
6
Chen, Hung-Ruei. "FMCW radar jamming techniques and analysis." Thesis, Monterey California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37597.
Full textAbstract:
Approved for public release; distribution is unlimitedFrequency-Modulated Continuous-Wave (FMCW) radar is a type of Low Probability of Intercept radar system that is being heavily investigated in the military. Not only is its transmission difficult to be detected by enemy intercept receivers, but FMCW radar has the inherent capability of increasing coherent signal power while suppressing noise power during its receive signal processing. This thesis investigates the jamming effectiveness of selected jamming waveforms by injecting the interfering signals into the Lab-Volt Radar Training System (LVRTS). The jamming effect is evaluated based on the change in beat frequency due to the jamming. Due to the hardware limitations of the LVRTS, a MATLAB simulation model is also constructed for advanced electronic attack testing. The MATLAB model emulates the FMCW emitter digital signal processing response to coherent and non-coherent jamming signals under an anti-ship capable missile scenario. The simulation output is the target range and range rate, whose error measures quantify the jamming effectiveness. From the standpoint of electronic warfare, related subjects such as electronic warfare support measures and FMCW electronic protection are also discussed.
7
Zhang, X. "Modelling of FMCW ground penetrating radar." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760700.
Full text
8
Bas, Alon. "An ultra high resolution FMCW radar." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/8357.
Full textAbstract:
Bibliography: leaves 127-128.There is a great need for real-time non-intrusive measurements in industry. A short-range radar system can be used to make these measurements. A standard requirement for these type of applications is high resolution. This is a standard problem in radar. Using classical signal processing techniques, the range resolution is proportional to the bandwidth of the transmitted signal. This poses a serious problem in radar as very large bandwidths are required - typically lSOGHz for 1 mm range resolution. Alternative techniques have been sought which do not rely on large transmitted bandwidths, but which rely on large signal-to-noise ratio (SNR). Such techniques exist in modem spectral analysis eg. auto-regressive techniques. These techniques model the data. In other words, they assume a priori information. Linear frequency-modulated continuous-wave (FMCW) radar was utilized, since a pulsed radar would require very precise time measurements due to the short range (a few ns). The FMCW radar would have to be very linear for the modelling process to work properly. The frequency domain measurement of the received system data would then be proportional to range. An FMCW radar system was built and tested. The modem signal processing techniques were found to work well when injected with sinusoidal signals from signal generators. The hardware was also found to perform satisfactorily. However, amplitude modulation was observed in the mixing process and subsequently, the modelling process did not perform satisfactorily when interfaced to the hardware. Due to the amplitude modulation problem, two closely-spaced targets disrupted the high resolution properties of the modelling process. Nevertheless, a single target could be resolved within a resolution bin of better than 1 cm. A solution is proposed in chapter eight, however, it is out of the scope of this thesis.
9
Mohd, Isa F. N. "Antenna system design for FMCW avalanche radar." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1356841/.
Full textAbstract:
Avalanches pose a significant threat to human life and settlements, hence their study is key in formulating settlement risk zones. Validating models of avalanches, developed to predict their behaviour, are limited by the quality of current field data. University College London (UCL) has developed a sophisticated FMCW phased array raday with sub-metre range resolution for imaging avalanches. The radar is installed in a bunker in an avalanche test facility in Valleé de La Sionne (VDLS) and has been gathering data since winter 2009. Due to space constraint and destructive issues with the bunker, a design for compact, low-cost and directive antenna is crucial to be used with the avalanche radar. This thesis documents the theory, analysis, design and measurement of the compact, low-cost and directive antennas. First, the parameter and location of VDLS is scrutinized to determine the characteristics that needs to be fulfilled when designing the antennas. Some of the parameters that were looked into are the operating frequency, the beamwidth of the antenna and the effects of placing the antenna in an array. Then, the study of the first antenna, a multilayer microstrip patch antenna with novel feeding method is presented. The directive concept of the antenna is obtained using an array of 4 x 2 patches, with increased antenna height and a novel feeding technique. The antenna is then fabricated using Rogers RT Duroid 5880 and assembled to be measured and compared with the simulated version. The second antenna proposed in this thesis is an array of microstrip Yagi antenna. The directive concept of this antenna is achieved through the design of the microstrip Yagi antenna itself and applying the antenna in an array of linear arrangement. The antenna is then fabricated using Rogers RT Duroid 5880 and compared with the simulated version. Finally, the first antenna characteristics is being exploited in series of Matlab program to estimate the antenna performance in a sparsely-populated phased array system. It has been demonstrated experimentally and through measurement that the antenna system design is suitable for the application of FMCW avalanche radar.
10
Zhu, Qizhao, and Yaqi Wang. "FMCW radar implemented with GNU Radio Companion." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-52985.
Full textAbstract:
Continuous-wave frequency-modulated radar, or FMCW radar, is simple in design, small in size and weight and uses low transmitting power. The range resolution depends on the bandwidth. FMCWradar is used in applications ranging from guided weapons systems to vehicle collision avoidance systems. Measuring the distance to the target is the essential feature of FMCW radar. Firstly, this thesis introduces the basic structure of the FMCW radar and the principle formeasuring distance. Secondly, by using software-dened radio (SDR),FMCW radar can be implemented and congured with a reduced costand complexity. In this report, the radar is implemented by means ofthe software GNU Radio Companion with a test signal. HackRF may be used in future work with an osmocom source instead of the testsignal.
11
Rameez, Muhammad. "Interference Mitigation Techniques in FMCW Automotive Radars." Licentiate thesis, Blekinge Tekniska Högskola, Institutionen för matematik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19362.
Full textAbstract:
Radar has emerged as an important sensor for scenario perception in automated driving and surveillance systems. The exponential increase of radar units in traffic and their operating frequency limitations have given rise to the problem of mutual interference. Radar's performance degrades in the presence of interference, which can result in false alarms and missed detections. In the case of safety-oriented systems (such as automatic emergency braking, blind-spot detection and obstacle detection at level crossings), radar's degraded performance can result in accidents. Therefore, it is important to mitigate the effect of mutual interference to make modern radar applications safe and reliable. The goal of this work is to develop signal processing techniques for interference mitigation in frequency modulated continuous wave (FMCW) radars operating at 77-81 GHz. The thesis investigates radar interference suppression in the spatial domain, using antenna arrays. The interference is suppressed by placing notches in the antenna radiation pattern in the direction of the interference source by employing digital beamforming. The array aperture (size) determines the beam-width and notch resolution of the receiving antenna. Narrow notches are desirable since they lead to a smaller suppressed region in the radar's field of view. It is demonstrated that an extended virtual aperture in a multiple-input-multiple-output (MIMO) FMCW radar does not offer an improved notch resolution for interference suppression due to a non-coherent interference signal in the virtual aperture. Moreover, it is shown that the calibration mismatches of the receiving array completely change the final antenna beam-pattern compared to the theoretical one. Additionally, an adaptive beamforming approach of interference suppression based on the least mean squares (LMS) algorithm is presented, which is evaluated using outdoor measurements from a 77GHz FMCW radar. The results demonstrate that the proposed technique suppresses interference successfully, resulting in a signal to interference plus noise ratio (SINR) improvement. It is also shown that complex-baseband (IQ) receivers achieve better interference suppression compared to real-baseband receivers when spatial domain methods are employed. The final research publication deals with interference mitigation in the time-domain intermediate frequency signal. The disturbed samples in the received signal are detected, removed, and reconstructed based on an estimated autoregressive (AR) signal model. The baseband signal coherence in both fast- and slow-time makes it possible to perform signal reconstruction in both dimensions. With the help of outdoor measurements covering selected scenarios, it is demonstrated that by carefully selecting the signal reconstruction dimension, a better SINR and side-lobe suppression can be achieved.
12
Carlsson, Andreas. "Vindjämförelse mellan VAD-algoritm och FMCW-radar." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392767.
Full textAbstract:
I denna undersökning som mestadels koncentrerat sig på VAD-algoritmen och dess fördelar och nackdelar har till att börja med två för algoritmen särdeles viktiga parametrar undersökts. Totala antalet VAD-cirklar respektive andelen av dessa som i slutänden ger en vind som resultat har direkt studerats som en funktion av tiden och samtidigt indirekt mot de synoptiska väderförhållanden som rådde vid tidpunkten i fråga. Som en andra del av arbetet utfördes en mestadels relativ jämförelse där två till viss del olika radaralgoritmer jämfördes i samband med olika vädersituationer och olika tider på dygnet. Vad det gäller totala antalet cirklar visade sig en god korrelation mot det storskaliga vädret vilket främst kunde ses i samband med frontpassager medan ingen typ av regelbunden dygnsvariation kunde ses. Andelen cirklar som i slutänden gav godkänd vind som resultat visade istället en starkt regelbunden dygnskorrelation medan enbart en ytterst svag korrelation med vädret kunde ses. Den följande jämförelsen visade på två intressanta resultat i samband med natt- respektive dagmätningar samt mätningar utförda vid två högtryckssituationer. Den första jämförelsen visade på en markant större skillnad i mätresultat i samband med nattliga mätningar än vid mätningar i liknande vädersituationer utförda dagtid. Sammankopplat med resultatet som gavs i samband med andelen resultatgivande cirklar antyder detta att VAD-algoritmen i samband med nattliga mätningar ger ett relativt inkorrekt resultat. Ett andra intressant resultat gavs i det visade sig finnas en signifikant skillnad i resultaten vid de jämförelsen mellan resultaten från mätningarna utförda vid de två ovan angivna högtryckssituationerna.
13
Radzicki, Vincent R. "FMCW Subsurface Microwave Imaging with Hexagonal Antenna Arrays." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/578169.
Full textAbstract:
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CAGround-penetrating radar (GPR) imaging is typically conducted in the pulse-echo mono-static format with a simple CW pulse as the probing signal. Recently, the data-acquisition hardware has been extended to the use of linear multi-element arrays. This paper presents an advanced GPR imaging system with FMCW probing waveforms, with a seven-element hexagonal array and software-defined data-acquisition hardware. The use of FMCW probing signals is for the optimization of the information contents of the returned waveforms. The utilization of the hexagonal unit is to produce sub-images with direction-independent resolution capability. In this paper, mathematical analysis, system modeling, field experiments, and image reconstruction are included to illustrate the performance and capability of the engineering concepts.
14
Ash, M. "FMCW phased array radar for imaging snow avalanches." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1383579/.
Full textAbstract:
Radar has emerged as a useful tool for measuring avalanches to improve our knowledge of their behaviour. These measurements are used to refine and validate mathematical models of avalanches which are employed in the calculation of avalanche risk zones. However, current radar measurements do not provide a true representation of an entire avalanche flow due to their inadequate range resolution and lack of cross-range resolution. This thesis describes the development of an FMCW phased-array radar for use as a research tool to enable 2-D field measurements of avalanches in unparalleled detail. The design of the radar is presented in detail based on a review of the current avalanche remote sensors and applicable radar literature. The radar operates at 5.3GHz to illuminate dense centimetre-size blocks of snow. It is shown that the developed radar has a range resolution of 1.3m following processing, a 19x gain over other avalanche radar, and is sensitive to snow movements beyond 2.5km, sufficient to measure an entire avalanche flow. Additionally, methods of processing the radar data are developed. These include MTI processing using an IIR filter, avalanche front detection using OS-CFAR, and cohering of the array using low-quality phase synchronising sources within the field-of-view of the radar. The radar is now deployed in a bunker at well-equipped avalanche test site in Switzerland where it automatically records naturally occurring avalanches. This thesis describes two avalanches which were recorded by the radar during the 2010/11 winter. The collected data has been processed using the aforementioned processing techniques. The processing outputs are presented including single channel range-time images, velocity measurements of the avalanche fronts, and detailed 2-D images of the avalanches showing unprecedented detail. It is shown that there is the potential to extract velocity measurements of individual blocks of snow comprising the avalanche.
15
Stofberg, Anneke. "IQ reflected power canceller for an FMCW radar." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86640.
Full textAbstract:
Thesis (MEng)--Stellenbosch University, 2014.ENGLISH ABSTRACT: Large close range environmental reflections or poor isolation between the transmit and receive paths of an FMCW radar can overload the receiver. The In phase and Quadrature phase (IQ) Reflected Power Canceller (RPC) provides a solution to the problem by cancelling any close range reflections. In this study a procedure to optimise the design of an RPC is developed and the performance limits of a practical RPC is investigated in depth. There are four focus areas in the evaluation and design of the IQ Reflected Power Canceller. First, an analysis was performed on a theoretical IQ Reflected Power Canceller, which provided insight into how the system functioned and made it possible to identify practical application issues that would arise during the design. The next focus area was the IQ Reflected Power Canceller’s dynamic range. Equations, based on the power and noise characteristics of each component in the canceller, were derived. From these equations, a system, with an optimised dynamic range, could be developed. Next, the IQ Reflected Power Canceller’s feedback loop stability was investigated. The canceller is an active negative feedback control system but, in order to obtain the negative feedback, the feedback signal has to be phase shifted by 180 degrees to the phase of the input signal. An analysis of the canceller’s RF phase contribution resulted in an equation that can be used to manage the nett RF phase in the feedback loop. The evaluation model of the IQ Reflected Power Canceller produced favourable results. The tests performed on the system included measuring the level of cancellation that can be achieved, whether the dynamic range corresponds to the predicted values and the amount of RF phase error that can be introduced in the feedback path while maintaining a stable system. The IQ Reflected Power Canceller was found to perform well in the evaluation. It provided a cancellation of more than 45 dB for close range reflections and the canceller remained stable across a wide range of RF centre frequencies (1 GHz). This means that the FMCW radar’s frequency modulation bandwidth will not be limited because of the IQ Reflected Power Canceller. The evaluation clearly showed that the modulator in the feedback loop is the critical element that determines the dynamic range of the radar with an RPC.
AFRIKAANSE OPSOMMING: Onvoldoende isolasie tussen die sender en ontvanger van ’n Frekwensie Gemoduleerde Kontinu Golf radar, sowel as groot weerkaatsings vanaf voorwerpe in die omgewing van die radar, veroorsaak dat die ontvanger versadig. Hierdie beperking veroorsaak dat die radar ’n verminderde dinamiese bereik het, en daarmee ook dat die radar se maksimum teiken-afstand verminder word. Die IQ Gereflekteerde Drywingskanselleerder kan as ’n oplossing gebruik word teen hierdie ongewenste refleksies. Hierdie navorsing poog om ’n kanselleerder te evalueer met die eind doel gestel daarop om ’n praktiese stelsel aanmekaar te sit. Die kanselleerder word geëvalueer deur na vier fokus areas te kyk. Eerstens word ’n ideale model opgestel, wat ’n beter begrip van die kanselleerder bewerkstellig. Uit hierdie ideale model, is daar praktiese oorwegings wat die kanselleerder affekteer, geïdentifiseer. Ten einde die dinamiese bereik van die radar ontvanger te verbeter, word ’n metode afgelei wat gebruik word om die kanselleerder se dinamiese bereik te optimeer. Hierdie metode neem die maksimum drywingsbeperkinge van die komponente in die kanselleerder in ag. Die kanselleerder is ’n aktiewe terugvoer beheerstelsel, en aangesien ’n sommeerder in die terugvoer lus gebruik word, moet die fase deur die lus met 180 grade geskuif word om sodoende ’n kansellerende sein by die ontvangde sein te tel. Die RF fase foute in die kanselleerder word geanaliseer deur ’n nie-ideale model van die kanselleerder op te stel. Hierdie nie-ideale model maak dit moontlik om die effek van ’n RF fase fout op die kanselleerder se stabiliteit te ondersoek. ’n Praktiese kanselleerder is ontwerp uit die inligting wat versamel is gedurende die evaluasie, en ’n werkende stelsel is aanmekaar gesit. Met hierdie praktiese kanselleerder is die hoeveelheid drywing-onderdrukking wat bereik kan word, gemeet. Die dinamiese bereik van die kanselleerder is ook bepaal en vergelyk met die teoreties berekende waardes. Die aannames oor die effek van die RF fase fout in die kanselleerder, is bevestig deur metings te neem. Goeie resultate is met die kanselleerder behaal. ’n Kansellasie van meer as 45 dB is gemeet vir naby-geleë refleksies. Die kanselleerder het ook stabiel gebly oor ’n wye band van senter-frekwensies (1 GHz). Dus sal die Frekwensie Gemoduleerde Kontinu Golf radar se modulasie bandwydte nie beperk word as gevolg van die kanselleerder nie. Uit die evaluasie is daar gevind dat die modulator die kritieke element in the kanselleerder se terugvoer lus is, dus bepaal die modulator die dinamiese bereik van die radar met ’n kanselleerder.
16
Zhang, Ao. "Object Detection from FMCW Radar Using Deep Learning." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42512.
Full textAbstract:
Sensors, as a crucial part of autonomous driving, are primarily used for perceiving the environment. The recent deep learning development of different sensors has demonstrated the ability of machines recognizing and understanding their surroundings.
Automotive radar, as a primary sensor for self-driving vehicles, is well-known for its robustness against variable lighting and weather conditions. Compared with camera-based deep learning development, Object detection using automotive radars has not
been explored to its full extent. This can be attributed to the lack of public radar datasets.
In this thesis, we collect a novel radar dataset that contains radar data in the form of
Range-Azimuth-Doppler tensors along with the bounding boxes on the tensor for dynamic road users, category labels, and 2D bounding boxes on the Cartesian Bird-EyeView range map. To build the dataset, we propose an instance-wise auto-annotation algorithm. Furthermore, a novel Range-Azimuth-Doppler based multi-class object detection deep learning model is proposed. The algorithm is a one-stage anchor-based detector that generates both 3D bounding boxes and 2D bounding boxes on Range-AzimuthDoppler and Cartesian domains, respectively. Our proposed algorithm achieves 56.3% AP with IOU of 0.3 on 3D bounding box predictions, and 51.6% with IOU of 0.5 on 2D bounding box predictions. Our dataset and the code can be found at https://github.com/ZhangAoCanada/RADDet.git.
17
Raimundo, Xavier Zage. "FMCW signals for radar imaging and channel sounding." Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11205/.
Full textAbstract:
A linear / stepped frequency modulated continuous wave (FMCW) signal has for a long time been used in radar and channel sounding. A novel FMCW waveform known as “Gated FMCW” signal is proposed in this thesis for the suppression of strong undesired signals in microwave radar applications, such as: through-the-wall, ground penetrating, and medical imaging radar. In these applications the crosstalk signal between antennas and the reflections form the early interface (wall, ground surface, or skin respectively) are much stronger in magnitude compared to the backscattered signal from the target. Consequently, if not suppressed they overshadow the target’s return making detection a difficult task. Moreover, these strong unwanted reflections limit the radar’s dynamic range and might saturate or block the receiver causing the reflection from actual targets (especially targets with low radar cross section) to appear as noise. The effectiveness of the proposed waveform as a suppression technique was investigated in various radar scenarios, through numerical simulations and experiments. Comparisons of the radar images obtained for the radar system operating with the standard linear FMCW signal and with the proposed Gated FMCW waveform are also made. In addition to the radar work the application of FMCW signals to radio propagation measurements and channel characterisation in the 60 GHz and 2-6 GHz frequency bands in indoor and outdoor environments is described. The data are used to predict the bit error rate performance of the in-house built measurement based channel simulator and the results are compared with the theoretical multipath channel simulator available in Matlab.
18
Scherr, Steffen [Verfasser]. "FMCW-Radarsignalverarbeitung zur Entfernungsmessung mit hoher Genauigkeit / Steffen Scherr." Karlsruhe : KIT Scientific Publishing, 2017. http://www.ksp.kit.edu.
Full text
19
Svensson, Johan. "High Resolution Frequency Estimation in an FMCW Radar Application." Thesis, Linköpings universitet, Reglerteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148526.
Full textAbstract:
FMCW radars are widely used in the process industry for range estimation, usu- ally for estimating the liquid level in a tank. Since the tank system, often is an automatically controlled system, reliable estimates of the surface level are re- quired, e.g. to avoid the tank from pouring over or become empty. The goal of this thesis is to investigate methods which can distinguish fre- quencies closer to each other than the FFT resolution limit. Two properties are of interest, the accuracy and the resolution performance. Three such methods have been evaluated: one that tries to compensate for the leakage and interference of close frequencies, one subspace-based method and one deconvolution method. The deconvolution is performed with the iterative Lucy Richardson algorithm. The methods are evaluated against each other and against a typical FFT based algorithm. The methods sensitivity to amplitude differences is examined together with the robustness against noise and disturbances which appear due to imperfections in the radar unit. The deconvolution algorithm is the one that performs the best. The subspace-based method SURE requires prior knowledge of the number of ingoing frequencies which is difficult to know for real data from an FMCW radar. The leakage compensation method main weakness is the influence of the phase difference between close frequencies. The deconvolution algorithm is evaluated on some real data, and it is proven that it has better resolution performance than the FFT. However, the accuracy of the estimates are dependent on the number of iterations used. With a large num- ber of iterations, the algorithm finds peaks with small amplitude nearby the large peaks and they will thus interact and hence contribute to a worse accuracy even in the undisturbed case. If too few iterations are used in the deconvolution algo- rithm the resolution performance is about the same as the FFT algorithm. With a suitable choice of iterations about 40–50 mm, extra of continuous measurements are achieved. However, the estimation error of the gained resolution can in the worst case be about 40–50 mm.
20
Jordan, Darryn Anton. "Time-Offset Fractional-N PLLs for Heterodyne FMCW SAR." Doctoral thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33820.
Full textAbstract:
This text contains an investigation into the use of time-offset fractional-N phase locked loops (PLLs) for heterodyne frequency-modulated continuous-wave (FMCW) synthetic aperture radar (SAR) and the impact of spurii on such a system. Heterodyne receiver architectures avoid phenomena which limit the sensitivity of their homodyne counterparts, and enable certain inter-antenna feed-through suppression techniques. Despite these advantages, homodyne receivers are more prevalent owing to advantages in size, weight and cost. Designed to address this dilemma, the miloSAR is believed to be the only heterodyne FMCW SAR to employ a pair of time-offset fractional-N PLLs for waveform synthesis to enable low-cost heterodyning and simplify filter-based feed-through suppression. This system architecture is revealed to be susceptible to swept-offset spurii termed spur chirps which hinder the sensor's performance. While integer boundary spurs and phase detector harmonics infamously plague fractional-N PLLs, their resultant spur-chirps have not seen analysis in the context of FMCW SAR. Simulations and measurements reveal that these spurii significantly degrade SAR image quality in terms of peak sidelobe ratio, structural similarity index measure and root mean square error. To combat this, several suppression techniques were assessed, namely: time domain zeroing, PLL loop bandwidth reduction, and a novel method termed range-Doppler spur masking. A subset of these suppression techniques were applied to measured SAR data sets, including car-borne data measured in Iowa, USA and airborne data captured in Oudtshoorn, South Africa. These results show that the impact of spur chirps can be effectively quelled, meaning that time-offset fractional-N PLLs offer an attractive, low-cost approach to the implementation of heterodyne FMCW SAR.
21
Nordin, Daniel. "Optical frequency modulated continuous wave (FMCW) range and velocity measurements." Doctoral thesis, Luleå, 2004. http://epubl.luth.se/1402-1544/2004/43.
Full text
22
Zavrsnik, Miha. "Application of the FMCW method to quasi-distributed absorption sensors." Thesis, University of Strathclyde, 2000. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21176.
Full textAbstract:
We report on different addressing mechanisms for quasi-distributed absorption sensors based on the frequency modulated continuous wave (FMCW) method. The sensor units consist of open-path micro-optic cells constructed from GRIN lenses, each of differing lengths. Guided by initial simulations, two approaches are experimentally investigated and evaluated, namely reference arm addressing and coherence addressing. Reference arm addressing is accomplished by the selection of different length reference arms in a Michelson configuration where each reference arm corresponds to a certain sensing unit. Coherence addressing is achieved by the interferometric mixing of two signals originating from each cell (from the glass/air interfaces). For each method, we show theoretically and experimentally how individual cells can be addressed and the measured signals obtained by suitable choice of cell length, proper modulation of the source and appropriate signal processing. In order to improve sensitivity we present the theoretical analysis of a new scheme based on combining the (FMCW) technique with frequency modulation spectroscopy (FMS). Here we arrange for only one sideband of the rf-modulation to be attenuated by the absorption feature and a new signal, proportional to the absorbance, appears in the output spectrum at a frequency corresponding to the difference between the rf-modulation frequency and the beat frequency of a cell. The method is highly sensitive and applicable to a variety of chemical species with narrow absorption lines, such as in trace gas analysis. We present the mathematical analysis of the proposed method for single and multiple cell systems, using methane detection as an example.
23
Bleh, Daniela [Verfasser], and Oliver [Akademischer Betreuer] Ambacher. "W-Band FMCW MIMO radar demonstrator system for 3D imaging." Freiburg : Universität, 2017. http://d-nb.info/1143602803/34.
Full text
24
Jaeschke, Timo [Verfasser]. "Hochpräzise FMCW-Radarsysteme zur korrelationsbasierten Geschwindigkeitsmessung von Fluidströmungen / Timo Jaeschke." München : Verlag Dr. Hut, 2017. http://d-nb.info/1147674523/34.
Full text
25
Kaiser, Markus [Verfasser]. "Range-Doppler-Analyse von FMCW-Sekundärradar-basierten Lokalisierungssystemen / Markus Kaiser." München : Verlag Dr. Hut, 2015. http://d-nb.info/1076437702/34.
Full text
26
FREITAS, João Mario Mendes de. "Sensor de nível por micro-ondas e tecnologia RADAR-FMCW." reponame:Repositório Institucional da UNIFEI, 2013. http://repositorio.unifei.edu.br/xmlui/handle/123456789/922.
Full textAbstract:
Submitted by repositorio repositorio (repositorio@unifei.edu.br) on 2017-08-24T18:19:29Z
No. of bitstreams: 1
dissertacao_freitas_2013.pdf: 2164362 bytes, checksum: 8f3b184eb764afb1f5d729705291ebb0 (MD5)Made available in DSpace on 2017-08-24T18:19:29Z (GMT). No. of bitstreams: 1 dissertacao_freitas_2013.pdf: 2164362 bytes, checksum: 8f3b184eb764afb1f5d729705291ebb0 (MD5) Previous issue date: 2013-03
Este trabalho apresenta o desenvolvimento de um protótipo de medidor de nível para tanques e silos que utiliza a tecnologia radar na faixa de micro-ondas de 2,5 GHz modulado em frequência FMCW, para melhor entendimento quanto ao funcionamento dos dispositivos comerciais semelhantes. O equipamento foi desenvolvido a partir do estudo das características relacionadas à modulação, amplificação, transmissão, recepção, demodulação, com o objetivo de se conhecer mais profundamente a propagação das ondas eletromagnéticas na faixa de micro-ondas e a influência do meio para o seu funcionamento. Aborda-se a evolução histórica da tecnologia do radar aplicada aos sensores de nível, apresentando dispositivos semelhantes permitindo a visualização das vantagens na medida de nível em cada um deles. O trabalho também descreve a importância da aplicação deste dispositivo em silos, tanques e/ou processos industriais onde a medição deve ser sem contato físico com o produto, observando as exigências de cada meio de propagação. É apresentado o desenvolvimento teórico, com as características de cada módulo do sensor. O desempenho dos módulos do protótipo foi avaliado comparando valores previamente calculados com dados obtidos através de testes práticos em laboratório.
27
Tchekashkin, Ivan. "Design and implementation of a low-cost FMCW imaging radar." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/24299.
Full textAbstract:
Imaging radar systems have been predominantly developed using a coherent pulse radar approach, which is typically associated with expensive and complex hardware that usually requires a large amount of space. Hence, the use of such sensors is reserved to large organizations that can afford to purchase or develop them. This is unfortunate as there are numerous uses for imaging radar sensors in both military and civilian sectors. One of such uses lies in the agricultural sector and entails using imaging radar data to monitor crop development. As a result, a project was initiated at the University of Cape Town (UCT), in collaboration with droneSAR company, which aimed to develop a low-cost, compact, imaging radar that could be mounted on a small Unmanned Aerial Vehicle (UAV). The purpose of this research project is aimed at developing the first system prototype. The RadioCamera-S is the S-band FMCW radar, that was developed to test the architecture that could be utilised to enable the filtering of the feed-through and nadir components, which are typically the strongest returns in the spectrum. The prototype has two modes of operation that are aimed at shifting the unwanted signals outside of the pass band of the receiver. This is achieved by generating two identical L-FMCW waveforms that are offset by a chosen time period. This enables a shift of the spectrum by the frequency, which corresponds to the time offset. The capabilities of the proposed hardware were examined and the specifications for the ground based version were developed. The parameters that influence the wave-form design were discussed and the optimal values were chosen for the ground based radar system. Verification of the transmitter and receiver operation was carried out, which was followed by system tests that demonstrated that the feed-through signal could be attenuated by employing the first proposed mode of operation. RTI plots were generated and showed that the radar was capable of detecting the movement of a reflector in the observable scene.
28
Cassidy, Scott L. "Millimetre-wave FMCW radar for remote sensing and security applications." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7856.
Full textAbstract:
This thesis presents a body of work on the theme of millimetre-wave FMCW radar, for the purposes of security screening and remote sensing. First, the development of an optimised software radar signal processor will be outlined. Through use of threading and GPU acceleration, high data processing rates were achieved using standard PC hardware. The flexibility of this approach, compared to specialised hardware (e.g. DSP, FPGA etc…), allowed the processor to be rapidly adapted and has produced a significant performance increase in a number of advanced real-time radar systems. An efficient tracker was developed and was successfully deployed in live trials for the purpose of real-time wave detection in an autonomous boat control system. Automated radar operation and remote data telemetry functions were implemented in a terrain mapping radar to allow continuous monitoring of the Soufrière Hills volcano on the Caribbean island of Montserrat. This work concluded with the installation of the system 3 km from the volcano. Hardware modifications were made to enable coherent measurement in a number of existing radar systems, allowing phase sensitive measurements, including range-Doppler, to be performed. Sensitivity to displacements of less than 200 nm was demonstrated, which is limited by the phase noise of the system. Efficient compensation techniques are presented which correct for quadrature mixer imbalance, FMCW chirp non-linearity, and scanner drive distortions. In collaboration with the Home Office, two radar systems were evaluated for the stand-off detection of concealed objects. Automatic detection capability, based on polarimetric signatures, was developed using data gathered under controlled conditions. Algorithm performance was assessed through blind testing across a statistically significant number of subjects. A detailed analysis is presented, which evaluates the effect of clothing and object type on detection efficiency.
29
Mirando, Dinesh Amal. "Millimeter – Wave/Terahertz Chirped Michelson Interferometer Techniques for Sub Surface Sensing." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1484698597373738.
Full text
30
Korkmaz, Hakan. "Hmic Miniaturization Techniques And Application On An Fmcw Range Sensor Transceiver." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611813/index.pdf.
Full textAbstract:
This thesis includes the study of hybrid microwave integrated circuits (HMIC), miniaturization techniques applied on HMICs and its application on a frequency modulated continuous wave (FMCW) range sensor transceiver. In the scope of
study, hybrid and monolithic microwave integrated circuits (HMIC and MMIC) are introduced, advantages and disadvantages of these two types are discussed. Large
size of HMICs is the main disadvantage especially for military and civil applications requiring miniature volumes. This thesis is mainly devoted on miniaturization work of HMICs in order to cope with this problem. In this scope, miniaturization
techniques of some HMICs such as 3 dB hybrid couplers and stubs are examined and analyzed. Their simulation and measurement results cohere with original circuit
results. Nevertheless, considerable size reduction up to 80% is achieved. Moreover, planar interdigital capacitors (IDC), spiral inductors (SI) and their equivalent circuit
models are introduced. Design technique is discussed with illustrative electromagnetic (EM) simulations. Furthermore, FMCW radar is introduced with its
basic operation principles, brief history and usage areas. In addition, FMCW range sensor transceiver is designed with its sub‐
parts
power amplifier, low noise amplifier (LNA), coupler and front end. Multi technology based on chip transistors, interdigital capacitors, spiral inductors and hybrid couplers with wire&
#8208
bond connections is used in the design. As the result of using hybrid miniaturized components small layout size is achieved for the transceiver system with its all components.
31
Baccouche, Bessem [Verfasser]. "FMCW Terahertz Volumetric Imaging with Sparse Multistatic Line Arrays / Bessem Baccouche." München : Verlag Dr. Hut, 2018. http://d-nb.info/1153254271/34.
Full text
32
Radzicki, Vincent R. "Detection and Imaging of Micro-Periodic Motion with FMCW Sensing Systems." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596461.
Full textAbstract:
ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVMotion estimation is a problem that is encountered in a diverse range of technical fields. This paper demonstrates the development of a solution to the motion estimation problem in the context of imaging systems. First the general case of motion estimation is outlined followed by the special case of micro-periodic motion. The design of an FMCW microwave imaging system optimized for micro-periodic motion is then presented along with experiments and results that support the theory.
33
Halai, S. "Active target location using crossed-dipole based circular array FMCW radar." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1458264/.
Full textAbstract:
Active target location systems capable of measuring both range and bearing have niche applications, including maritime navigation where a seafaring vessel is manoeuvring in the vicinity of a harbour or an oil rig. Such systems can also be used to determine the location of other vessels for vessel-to-vessel personnel or material transfer. The usual approach is to combine FMCW radar with a mechanically or electrically steered beam, establishing both range and bearing to a target, respectively. The radar system described in this thesis is an innovative alternative approach, one that combines FMCW radar with a crossed-dipole antenna, which conveniently functions as a circular array, thereby simultaneously determining the range and bearing of an active target. By using phase mode excitation, neither mechanical nor electrical beam steering is required to locate the active target, as the receive antenna is able to monitor 360 in azimuth continually. However, due to the use of +1st and -1st order phase modes, the radar can only operate in an 180 sector unambiguously. The usual inherent problems with circular arrays being aected by multipath are also easily mitigated by the range resolution of the radar. This thesis describes in detail the development of a 2.44 GHz crossed-dipole antenna structure and its associated feed network. It also describes the first prototypes that led to its current form and goes on to discuss in detail the design and construction of the radar system and frequency shifted active target. Frequency shifting was implemented within the target to overcome the increased clutter power due to the omnidirectional receive antenna. However, firstly this thesis lays the foundation of radar theory, active targets, phase modes and basic antenna theory. Some of the literature associated with radars currently used in this type of scenario is also discussed. Appropriate analysis, modelling and experimental validation is conducted to assess system performance in relation to the predicted behaviour. The radar system was then tested in an open field, with the active target detected to a range of 125 m.
34
Crémona, Patrick. "Traitement du signal d'un radar FMCW à visée inclinée pour l'automobile." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT032H.
Full textAbstract:
La securite routiere reste une des preoccupations majeures de notre societe, et a l'aube du xxi siecle on espere beaucoup de l'electronique embarquee. Ces travaux de recherche montrent qu'avec un radar anticollision, dont la fonction principale est la detection d'obstacles presentant un danger imminent, on peut aussi envisager une caracterisation de la cible route, ce qui renforcerait considerablement la securite automobile. Le but de cette these est donc la mesure de la vitesse absolue du vehicule sur sol et la reconnaissance automatique de l'etat de la route (route seche / route mouillee) pour une meilleure appreciation de la distance de securite a conserver entre deux vehicules. Le manuscrit decrivant cette etude debute par une description des particularites requises pour un radar anticollision automobile, afin de justifier notre choix de developper un radar a ondes continues et a modulation lineaire de frequence (fmcw). Dans la seconde partie, on s'interesse a la cible route pour mieux cerner les mecanismes de reflexions qui interviennent dans le signal radar. On montre que la forme de la densite spectrale de puissance de l'echo radar change avec le type de revetement. La troisieme partie se consacre a la mesure vitesse sur sol du vehicule. On s'est attache a etudier diverses techniques d'analyse spectrale parametrique afin de mettre en evidence les methodes qui assurent une mesure vitesse fiable. Enfin dans la quatrieme et derniere partie, avec l'aide des methodes classiques de classification bayesienne et non bayesienne associees a un pretraitement de compression ou de dilatation spectrale pour compenser l'effet doppler, on reussit a reconnaitre divers revetements de routes
35
Kunert, Martin. "Radar FMCW automobile : une approche système globale avec des méthodes modernes." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT120H.
Full textAbstract:
Pour faire fonctionner un radar fmcw dans l'environnement automobile d'une facon robuste et efficace il faut deux niveaux de traitement de donnees, l'estimation de la frequence du signal et la discrimination et multi-pistage des cibles. Une multiplicite des implantations et les relations mutuelles sont presentees pour ces deux besoins et des nouvelles extensions sont developpees. Importance est mise sur les caracteristiques propres au radar fmcw et les similitudes avec les methodes modernes comme l'analyse avec des ondelettes et des reseaux de neurones. Un filtre de pistage multi-cible incite par des donnees et commande par des regles predefinies et une extraction des pics spectrales basee sur un reseau de neurones sont developpees et appliquees aux signaux enregistres sur la route avec beaucoup de succes et une robustesse accrue
36
Gale, Nicholas C. "FUSION OF VIDEO AND MULTI-WAVEFORM FMCW RADAR FOR TRAFFIC SURVEILLANCE." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1315857639.
Full text
37
Mackie, James David. "Compact FMCW Radar for GPS-Denied Navigation and Sense and Avoid." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4388.
Full textAbstract:
Location information is vital for any type of aircraft and even more crucial for Unmanned Aerial Systems (UAS). GPS is a readily available solution but signals can easily be jammed or lost. In this thesis, radar is explored as a backup system for self-localization when GPS signals are not available. The method proposed requires that an area be pre mapped by collecting radar data with known latitude and longitude coordinates. New radar data is then collected and compared to previously stored values. Channel matrices are stored at each point and are used as the basis for location comparisons. Various methods of matrix comparison are used and both simulation as well as experimental results are shown. The main results of this thesis show that position can be determined using channel matrices if the sensor is within a certain radius of previously stored locations. This radius is on the order of a wavelength or less. Using correlation matrix comparisons the radius of localization is broadened. A novel method using multiple channel and multiple frequency data proves to be successful and determines the position of an octorotor UAS with a mean position error of less than three meters. The design of a low-cost, compact, and light-weight FMCW radar for two applications is also presented. The first application is a novel radar based positioning system that utilizes multiple channel and multiple frequency information to determine position. The second application is a UAS sense and avoid system using a monopulse configuration. Without connectors or antennas, the radar weighs 45.7 grams, is 7.5 cm x 5 cm x 3 cm in size, and costs less than $100 when built in quantities of 100 or more (excludes antennas and connectors). It is tested using delay lines and corner reflectors and accurately determines the distance to close range targets.
38
Toverland, Anders. "Icke modellbaserad ekoföljning för radarnivåmätning." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5960.
Full textAbstract:
Denna rapport behandlar en fullständig metod för att följa, associera och klassificera ekospår. Vid radarnivåmätning ska ekon som härstammar ifrån samma fysikaliska objekt följas över tiden och klassificeras. Dagens radarnivågivare löser problemet genom konfiguration. Tankens geometri samt vilka störande objekt som finns anges vid installation.
Den framtagna metoden har delats upp i tre delmoment. Först binds individuella inmätta ekon samman till linjesegment. Dessa segment associeras samman till ekospår varefter dessa klassas fysikaliskt. Metoden kräver betydligt mindre konfiguration än den lösning som används för tillfället.
In this report a method for target tracking, association and classification of echo tracks in radar level gauges is discussed. In tank gauging echoes from the same physical object are called an echo track. The echoes must be tracked over time and classified. Currently radar level gauge units requires configuration to achieve classifications of echo
tracks. At installation tank geometry and disturbing echoes has to be registered.
The method has been divided into three parts. Firstly individual measured echoes are replaced by line segments. Association algorithms then create echo tracks from these segments. The third step is to classify these tracks physically. This method eliminates registering of disturbing echoes.
39
Ernst, Robert. "Vital Sign Radar : Development of a Compact, Highly Integrated 60GHz FMCW Radar for Human Vital Sign Monitoring." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31496.
Full textAbstract:
Supervision of human vital signs has always been an essential part in healthcare. Nowadays there is a strong interest in contact-less monitoring methods as they operate less static and offer higher flexibility to the people observed. Recent industrial development enabled radar functionality to be packed in single-chip solutions, decreasing application complexity and speeding up designs. Within this thesis, a vital sign radar prototype has been developed utilising a recently released 60GHz frequency modulated continous wave single-chip radar. The electronics development has been focused on compactness and high system integration. Special attention has been given to the onboard analogue signal filtering and digital data preprocessing. The resulting prototype radar is then tested and evaluated using test scenarios with increasing difficulty. The final experiments prove that the radar is capable of tracking human respiration rate and heartbeat simultaneously from a distance of 1m. It can be concluded that modern radar devices may be significantly miniaturised for e.g. portable operation while offering a wide variety of application possibilities including vital sign monitoring.
40
Svensson, Jonny. "Implementation of an FMCW Radar Platform With High-Speed Real-Time Interface." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6163.
Full textAbstract:
Acreo AB has developed a radar prototype used for illustrate how the SiGe technology could be used. The radar prototype needs further development with a fast interface and a more integrated design. The beginning of the report describes the radar technique theory and the composing equations. The theoretical background is used to explain each component of the system. The report continues by specifying the target of the next radar prototype. The chosen implementation is motivated and the mode of procedure is described in detail. Test benches were used to verify correct functionality and some limits were found. The report is concluded with test results and recommendations on further enhancements.
Acreo AB har utvecklat en radarprototyp för att illustrera hur SiGe teknologi kan användas. Prototypen behöver vidareutvecklas med ett snabbt digitalt interface och en kompaktare design. Rapporten inleds med att beskriva radarteknikens funktionalitet och de utgörande ekvationerna. Den teoretiska bakgrunden används för att förklara varje komponent som systemet utgörs av. Rapporten fortsätter med att specificera målet med nästa radarprototyp. Den valda implementationen motiveras och tillvägagångssättet beskrivs detaljerat. Testuppkopplingar verifierade korrekt funktionalitet och begränsningar insågs. Rapporten avslutas med en sammanfattning av uppnådda testresultat och rekommendationer på framtida förbättringar.
41
Undheim, Ruben. "Design of a Linear FMCW Radar Synthesizer with Focus on Phase Noise." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16787.
Full textAbstract:
The linear FMCW radar has become more popular in recent years mainly due toadvances in digital signal processing and the good performance of the radar at closeranges. What puts limits to the performance is mainly phase noise. Because trans-mission and reception happen simultaneously, the phase noise will limit the maxi-mum power that should be used and hence also the ability to detect weak targets.By ensuring during the design process that the phase noise is low, the radar’s perfor-mance will thus get better. This thesis describes the construction of a FMCW radarfrequency synthesizer where the focus is mainly on phase noise. The functionalityof the circuit is shown to be successful, but there is more phase noise than what ispredicted. Several causes for this are discussed. Important background theory aboutradars, phase noise and phase-locked loops is presented and several simulations areperformed in order to get a better understanding. The conclusion of the work isthat it is not very hard to build a synthesizer, but in order to tweak the phase noiseperformance to be as good as the linear theory tells it to be, careful attention mustbe paid during all stages of the design.
42
Hitzler, Martin [Verfasser]. "Breitbandige hochintegrierte FMCW-Radare bei 160 GHz für industrielle Anwendungen / Martin Hitzler." Ulm : Universität Ulm, 2019. http://d-nb.info/118734267X/34.
Full text
43
Radzicki, Vincent R., and Hua Lee. "Circular-Mode Synthetic Aperture Subsurface Imaging with MIMO FMCW Microwave Array System." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579666.
Full textAbstract:
ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NVThis paper describes the analysis and development of microwave subsurface synthetic-aperture imaging in the circular-scan mode with a four-antenna FMCW MIMO radar system. The objective is to improve the localization and correspondence capability of the imaging operation.
44
Lee, Michael, and Daniel Doonan. "Image Reconstruction and Resolution Enhancement Algorithm for FMCW Medical Ultrasound Imaging Systems." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595623.
Full textAbstract:
ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, NevadaThis paper presents an overview of the graduate research program on the design and development of the high-performance image reconstruction and resolution enhancement algorithm for an advanced medical ultrasound imaging system. The data acquisition is conducted with a micro flexible transceiver array, operating in the multi-static stepped-frequency FMCW mode. The objective of this system is to perform high-speed high-resolution image reconstruction for biomedical applications.
45
Goy, Philippe. "Détection d'obstacles et de cibles de collision par un radar FMCW aéroporté." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0156/document.
Full textAbstract:
Cette thèse, réalisée en partenariat avec Rockwell-Collins France, s'inscrit dans le cadre du développement d'un radar FMCW aéroporté de détection d'obstacles fonctionnant en bande X. Dans cette thèse, nous nous plaçons dans le contexte plus général de détection de cibles présentant un risque de collision avec le porteur radar dans du fouillis de sol. Les performances de détection des cibles d'intérêt diminuent grandement lorsqu'elles se retrouvent dans les zones de fouillis. Le principal objectif de cette thèse réside ainsi dans la conception de traitements en vue d'améliorer les capacités de détection et de reconnaissance de cibles présentant un risque de collision avec le porteur radar dans les zones de fouillis de sol. Dans un premier temps, nous effectuons une revue des traitements adaptés à la détection d'obstacles par un radar aéroporté FMCW: formation de faisceaux conventionnelle, compensation de migration distance, et création d'une cartographie distance-vitesse par double FFT. Dans un second temps, nous utilisons ensuite un traitement d'antennes adaptatif pour séparer en élévation le fouillis de sol et d'éventuels obstacles situés au-dessus du sol pouvant présenter un risque pour le porteur (câbles, pylônes, immeubles, ...). Dans la seconde partie de cette thèse, nous incluons une information supplémentaire sur le signal temporel d'une case distance avec un temps d'intégration plus long~: la variation de fréquence Doppler des cibles. Une cible de collision ou un câble ne changent pas de fréquence tandis qu'un élément au sol aura une variation connue dépendant de la vitesse du porteur et de son angle de vue. Cette information nous a tout d'abord permis de séparer le signal d'un pylône et d'un câble, pour ensuite séparer la cible de collision du fouillis de sol. Enfin, nous effectuons la détection adaptative d'une cible mobile de collision étendue en distance et noyée dans le fouillis de sol. Les algorithmes développés dans cette thèse ont été testés avec succès sur données expérimentalesThis thesis, in collaboration with Rockwell-Collins France, forms part of the development of an X-band FMCW airborne radar designed for obstacles detection and collision avoidance. More precisely, this thesis deals with the problem of detecting targets which exhibit a collision trajectory with the radar carrier, in presence of ground clutter. Target detection performances are highly degraded when the targets of interest fall into ground clutter. The main goal of this thesis is to develop signal processing methods to increase radar detection capacities and recognition for collision targets inside ground clutter. First, we give a brief review of signal processing methods for target detection using an airborne FMCW radar : conventional beamforming, range migration compensation, double-FFTs for Range-Doppler Map visualization. We then derive an adaptive antenna array processing to separate ground clutter and fixed hazardous obstacles above the ground (cables, pylons, buildings, ...) using their difference in elevation angle. In the second part of this thesis, we use a long integration time and include extra information on the time model of a range cell signal : Doppler frequency variation. A collision target does not exhibit Doppler frequency variation, whereas fixed obstacle or ground clutter exhibits a known variation depending on the carrier velocity and the aspect angle. We take advantage of this variation first to separate a cable from a pylon, and then separate collision target from ground clutter. We finally tackle the problem of adaptively detecting a collision mobile spread target in ground clutter region. The proposed algorithms in this thesis have been successively tested on experimental data
46
Ghetti, Gabriele. "Studio Sperimentale delle Prestazioni di un Radar FMCW per Applicazioni Indoor e Outdoor." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textAbstract:
La crescente domanda relativa ai sistemi di localizzazione e tracking a partire dal settore automotive fino a quello della difesa, ha aperto la strada verso una rivoluzione nelle tecnologie di detection e ranging. Tra i vari dispositivi sviluppati in tale ambito vi sono i sistemi radar, i quali possiedono alcuni vantaggi che li contraddistinguono da tutti gli altri tipi di sensori. Grazie al loro principio di funzionamento infatti, possono operare in qualsiasi condizione di luce, tempo atmosferico ed in ambienti con scarsa sicurezza operativa. Queste caratteristiche collocano i sistemi radar al centro di numerosi studi, laddove vi sia l’obbiettivo di implementare tecnologie di localizzazione accurate e sempre più economiche. Sono state proposte nel corso del tempo diverse categorie di sistemi radar, ognuna con i suoi pregi e difetti; nello specifico in questo elaborato si concentra l’attenzione sui sistemi radar FMCW, i quali utilizzano una particolare modulazione in frequenza del segnale. Nonostante tale tecnologia sia stata studiata ed implementata decine di anni fa, il radar FMCW ` e tutt’ora oggetto di studio, dal momento che in passato lo sviluppo delle tecnologie digitali non permetteva la rapida esecuzione di algoritmi con una determinata complessità computazionale. Si ricordano inoltre i notevoli progressi nel design di circuiti a radiofrequenza che hanno portato alla costruzione di radar ad onde millimetriche, che posso offrire un’accuratezza notevole rispetto ad altri tipi di radar. In questo lavoro di tesi si illustra innanzitutto una visione di principio dei sistemi radar FMCW. Successivamente viene descritta una teoria generale per l’analisi del segnale utilizzato dal radar. Infine si illustrano le campagne di misura e l'elaborazione dei dati.
47
Liau, Teh-Fu. "Digital signal processing for the detection of hidden objects using an FMCW radar." Thesis, Queen Mary, University of London, 1987. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1591.
Full textAbstract:
This thesis deals with the detection of hidden objects using a short-range frequency-modulated continuous wave (FMCW) radar. The detection is carried out by examining the estimated Power Spectral Density (PSD) functions of sampled returns, the peaks of which theoretically correspond to the reflecting surfaces of hidden objects. Fourier and non-Fourier PSD estimation algorithms are applied to the radar returns to extract information on the hidden surfaces. The Fourier methods used are Direct, Blackman-Tukey, Bartlett, and Smoothed Periodograms. The different PSDs are compared, and the validity of each PSD is then discussed. The study is new for this type of radar and the results are used as references for other PSD estimations. Non-Fourier methods offer many advantages. Firstly the Autoregressive Process (AR) is used for this particular application. As well as PSDs the noise spectra are also produced to show the performance of the chosen models. An alternative approach to the conventional forward-backward residuals ( e. g. Burg's method) or autocorrelation and covariance methods ( as those used in speech analysis ) is introduced in this thesis. The stability and good resolution of the PSDs is obtained by a better estimation of the autocovariance coefficients (ACF) from the data available : averaging two p-shifted ACF calculated by covariance method. Once the covariance coefficients are found, the Levinson-Durbin recursive algorithm is used to get the model parameters and the PSDs. Two other non-conventional methods are also attempted to show the image of hidden objects. They are Pisarenko Harmonic Decomposition method and Prony energy spectrum density estimation. In addition to the one-dimensional processing stated above, this thesis extends it to two-dimensional cases, which give more information on the shape of hidden objects.
48
Baer, Christoph [Verfasser]. "Massendurchflussmessung von pneumatisch geförderten Feststoffen auf Basis von hochpräzisen FMCW-Radarsystemen / Christoph Baer." München : Verlag Dr. Hut, 2015. http://d-nb.info/1074063694/34.
Full text
49
Zech, Christian [Verfasser], and Oliver [Akademischer Betreuer] Ambacher. "Untersuchung von Rauscheinflüssen auf die präzise Abstandsbestimmung von mmW FMCW-Radaren im Nahbereich." Freiburg : Universität, 2021. http://d-nb.info/123319710X/34.
Full text
50
BASTOS, Izabella Carneiro. "Proposta para melhoria da resolução em radares FMCW utilizados na medição de nível." reponame:Repositório Institucional da UNIFEI, 2010. http://repositorio.unifei.edu.br/xmlui/handle/123456789/1511.
Full textAbstract:
Submitted by Margareth Ribeiro (meg@unifei.edu.br) on 2018-08-06T12:28:23Z
No. of bitstreams: 1
dissertacao_0037072.pdf: 1288973 bytes, checksum: e775794fd0c6992235fb579d8be015bd (MD5)Made available in DSpace on 2018-08-06T12:28:23Z (GMT). No. of bitstreams: 1 dissertacao_0037072.pdf: 1288973 bytes, checksum: e775794fd0c6992235fb579d8be015bd (MD5) Previous issue date: 2010-08
Este trabalho explora um tipo específico de medidor de nível capaz de apresentar resultados confiáveis. Dedica-se à melhoria da resolução em medições de distância para sistemas industriais empregando radares de onda contínua com modulação em frequência (FMCW). Partindo desta opção, realiza-se um estudo do procedimento e aborda-se um método para tornar sua utilização mais ampla. As aplicações referem-se à medição de nível de tanques contendo substâncias sólidas ou líquidas.Este trabalho apresenta propostas consideradas na literatura e outras propostas pela autora e desenvolve simulações para demonstrar o método.