Log in

Relevant bibliographies by topics / Low frequency radar

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Low frequency radar'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Low frequency radar.'

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.

Journal articles on the topic "Low frequency radar"

1

Costanzo, Sandra, Giuseppe Di Massa, Antonio Costanzo, et al. "Multimode/Multifrequency Low Frequency Airborne Radar Design." Journal of Electrical and Computer Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/857530.

Full text

Abstract:

This work deals with the design of multimode/multifrequency airborne radar suitable for imaging and subsurface sounding. The system operates at relatively low frequencies in the band ranging from VHF to UHF. It is able to work in two different modalities: (i) nadir-looking sounder in the VHF band (163 MHz) and (ii) side-looking imager (SAR) in the UHF band with two channels at 450 MHz and 860 MHz. The radar has been completely designed by CO.Ri.S.T.A. for what concerns the RF and the electronic aspect, and by the University of Calabria for what concerns the design, realization, and test of SAR

APA, Harvard, Vancouver, ISO, and other styles

2

Yurovsky, Yury, Vladimir Kudryavtsev, Semyon Grodsky, and Bertrand Chapron. "Low-Frequency Sea Surface Radar Doppler Echo." Remote Sensing 10, no. 6 (2018): 870. http://dx.doi.org/10.3390/rs10060870.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Baranov, G., R. Gabruk та I. Gorishna. "Features of Usіng Pulse-Doppler Radars for Determіnatіon Low-Altіtude Targets". Metrology and instruments, № 2 (3 травня 2019): 62–66. http://dx.doi.org/10.33955/2307-2180(2)2019.62-66.

Full text

Abstract:

In this paper, we analyzed the features of Doppler processing in radars. In ground based radars, the amount of clutter in the radar receiver depends heavily on the radar-to-target geometry. The amount clutter is considerably higher when the radar beam has to face toward the ground. Furthermore, radars employing high PRFs have to deal with an increased amount of clutter due to folding in range. Clutter introduces additional difficulties for airborne radars when detecting ground targets and other targets flying at low altitudes. This is illustrated in Fig. 10.5. Returns from ground clutter emana

APA, Harvard, Vancouver, ISO, and other styles

4

Rodriguez, Paul. "Solar radar astronomy with the low-frequency array." Planetary and Space Science 52, no. 15 (2004): 1391–98. http://dx.doi.org/10.1016/j.pss.2004.09.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Jacobi, Ch, C. Arras, D. Kürschner, W. Singer, P. Hoffmann, and D. Keuer. "Comparison of mesopause region meteor radar winds, medium frequency radar winds and low frequency drifts over Germany." Advances in Space Research 43, no. 2 (2009): 247–52. http://dx.doi.org/10.1016/j.asr.2008.05.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Berquin, Yann, Alain Herique, Wlodek Kofman, and Essam Heggy. "Computing low-frequency radar surface echoes for planetary radar using Huygens-Fresnel's principle." Radio Science 50, no. 10 (2015): 1097–109. http://dx.doi.org/10.1002/2015rs005714.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Javidi, Giti, and Ehsan Sheybani. "Data Visualization for Low-Frequency Inverse Synthetic Aperture Radar (ISAR)." International Journal of Interdisciplinary Telecommunications and Networking 10, no. 3 (2018): 1–8. http://dx.doi.org/10.4018/ijitn.2018070101.

Full text

Abstract:

The purpose of this article was to use ISAR to determine the distance between the receiving antenna and the transmitting antenna. Once a systematic approach has been determined, this article could be used on a spacecraft to locate debris in the path of the carrier. Using low frequency radar that has the transmitting pulse built within the converters, the authors transmitted the data and determined the distance between the two antennas according to the time delay of the radar. Using amplified signals, the relationship between the distance and the time delay for the radar were calculated for eac

APA, Harvard, Vancouver, ISO, and other styles

8

Imhoff, M. L., S. Carson, and P. Johnson. "A low-frequency radar experiment for measuring vegetation biomass." IEEE Transactions on Geoscience and Remote Sensing 36, no. 6 (1998): 1988–91. http://dx.doi.org/10.1109/36.729374.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Geiger, Martin, Christian Wegner, Winfried Mayer, and Christian Waldschmidt. "A Wideband Dielectric Waveguide-Based 160-GHz Radar Target Generator." Sensors 19, no. 12 (2019): 2801. http://dx.doi.org/10.3390/s19122801.

Full text

Abstract:

The increasing number of radar sensors in commercial and industrial products leads to a growing demand for system functionality tests. Conventional test procedures require expensive anechoic chambers to provide a defined test environment for radar sensors. In this paper, a compact and low cost dielectric waveguide radar target generator for level probing radars is presented. The radar target generator principle is based on a long dielectric waveguide as a one-target scenery. By manipulating the field distribution of the waveguide, a specific reflection of a radar target is generated. Two reali

APA, Harvard, Vancouver, ISO, and other styles

10

Aguirre, Roberto, Felipe Toledo, Rafael Rodríguez, Roberto Rondanelli, Nicolas Reyes, and Marcos Díaz. "Low-Cost Ka-Band Cloud Radar System for Distributed Measurements within the Atmospheric Boundary Layer." Remote Sensing 12, no. 23 (2020): 3965. http://dx.doi.org/10.3390/rs12233965.

Full text

Abstract:

Radars are used to retrieve physical parameters related to clouds and fog. With these measurements, models can be developed for several application fields such as climate, agriculture, aviation, energy, and astronomy. In Chile, coastal fog and low marine stratus intersect the coastal topography, forming a thick fog essential to sustain coastal ecosystems. This phenomenon motivates the development of cloud radars to boost scientific research. In this article, we present the design of a Ka-band cloud radar and the experiments that prove its operation. The radar uses a frequency-modulated continu

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Low frequency radar"

1

Moes, Henderikus Jan. "A low noise PLL-based frequency synthesiser for X-band radar." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1337.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Abd, Rashid Nur Emileen Binti. "Automatic vehicle classification in a low frequency forward scatter micro-radar." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3018/.

Full text

Abstract:

Forward Scattering Radar (FSR) is a special case of bistatic radar configuration where the desired radar signal is formed via the shadowing of the direct (transmitter-to-receiver) signal by the target body. FSR offers a number of interests including an inherent ability to detect stealth target, absence of signal fluctuations, reasonably simple hardware, enhanced target radar cross-section (RCS) compared to traditional radar and capability to use Inverse Synthetic Aperture algorithms for Automatic Target Classification (ATC). Of course as any system FSR has its own drawbacks and limitations. Th

APA, Harvard, Vancouver, ISO, and other styles

3

Rivera, Suaña Javier Alvaro. "Design of a Low-Noise Amplifier for Radar Application in the 5 GHz Frequency Band." Thesis, Högskolan i Gävle, Elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24570.

Full text

Abstract:

The purpose of this project was to design and manufacture a Low-Noise Amplifier (LNA) working at a 5 GHz frequency band, by using High Electron Mobility Transistor (HEMT) from Avago Technologies. To improve our design, it was necessary to build a two-stage amplifier; one stage to work in minimum noise sensitivity, and another stage to get the maximum gain achievable by the transistor. This thesis work was carried out as a part of the UAV (Unmanned Aerial Vehicle) system project developed by a research group at the Radio communication and Microwave Electronics department, UMH.The project was de

APA, Harvard, Vancouver, ISO, and other styles

4

Malan, Frederich T. "Reduction of the antenna coupling in a bi-static, FM-CW radar system." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18029.

Full text

Abstract:

Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: A well-known problem with FM-CW radar systems is the leakage of transmitter power into the receiver which leads to the making of close-in targets, and can severely limit the system dynamic range performance. This thesis considers two solutions to this radar system problem for a low frequency radar operating in the VHF band. The first method to suppress coupling is using separate transmit and receive antennas designed in such a way as to reduce coupling between them. The second is to design a negative feedback loop as part of

APA, Harvard, Vancouver, ISO, and other styles

5

Monk, Andrew Michael. "Exploration into the Use of a Software Defined Radio as a Low-Cost Radar Front-End." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8742.

Full text

Abstract:

Inspection methods for satellites post-launch are currently expensive and/or dangerous. To address this, BYU, in conjunction with NASA, is designing a series of small satellites called CubeSATs. These small satellites are designed to be launched from a satellite and to visually inspect the launching body. The current satellite revision passively tumbles through space and is appropriately named the passive inspection cube satellite (PICS). The next revision actively maintains translation and rotation relative to the launching satellite and is named the translation, rotation inspection cube sate

APA, Harvard, Vancouver, ISO, and other styles

6

Inácio, Ana Inês Silva. "Linearizing an L-band power amplifier for RADAR applications." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/13410.

Full text

Abstract:

Mestrado em Engenharia Eletrónica e Telecomunicações<br>This thesis attempts to improve the linearity, while keeping the efficiency, of a given power amplifier to be used in RADAR applications. The thesis is divided in three major parts: first, the theoretical analysis around the chosen linearization technique is done by mathematical deduc-tion and MATLAB simulations. In second place, ADS simulations with low-frequency dithering applied to an amplifier model, provided by the man¬ufacturer of the amplifier, are performed. The desired characteristics found during simulations will be used on the

APA, Harvard, Vancouver, ISO, and other styles

7

Lauterbach, Adam Peter. "Low-cost SiGe circuits for frequency synthesis in millimeter-wave devices." Australia : Macquarie University, 2010. http://hdl.handle.net/1959.14/76626.

Full text

Abstract:

"2009"<br>Thesis (MSc (Hons))--Macquarie University, Faculty of Science, Dept. of Physics and Engineering, 2010.<br>Bibliography: p. 163-166.<br>Introduction -- Design theory and process technology -- 15GHz oscillator implementations -- 24GHz oscillator implementation -- Frequency prescaler implementation -- MMIC fabrication and measurement -- Conclusion.<br>Advances in Silicon Germanium (SiGe) Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) technology has caused a recent revolution in low-cost Monolithic Microwave Integrated Circuit (MMIC) design. -- This thesis presents the design,

APA, Harvard, Vancouver, ISO, and other styles

8

Jansson, J. P. (Jussi-Pekka). "A stabilized multi-channel CMOS time-to-digital converter based on a low frequency reference." Doctoral thesis, Oulun yliopisto, 2012. http://urn.fi/urn:isbn:9789514299322.

Full text

Abstract:

Abstract The aim of this work was to improve the performance and usability of a digital time-to-digital converter (TDC) in CMOS technology. The characteristics of the TDC were improved especially for the needs of pulsed laser time-of-flight (TOF) distance measurement, where picosecond-level precision with a long µs-level measurement range is needed in order to approach mm-level measurement accuracy. Stability in the face of process, voltage and temperature variations, multiple measurement channels, alternative measurement modes, a high integration level, standard interfaces and simple usage we

APA, Harvard, Vancouver, ISO, and other styles

9

Thrivikraman, Tushar. "Analysis and Design of Low-Noise Amplifiers in Silicon-Germanium Hetrojunction Bipolar Technology for Radar and Communication Systems." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19755.

Full text

Abstract:

This thesis presents an overview of the simulation, design, and measurement of state-of-the-art Silicon-Germanium Hetro-Junction Bipolar Transistor (SiGe HBT) low-noise amplifiers (LNAs). The LNA design trade-off space is presented and methods for achieving an optimized design are discussed. In Chapter 1, we review the importance of LNAs and the benefits of SiGe HBT technology in high frequency amplifier design. Chapter 2 introduces LNA design and basic noise theory. A graphical LNA design approach is presented to aid in understanding of the high-frequency LNA design process. Chapter 3

APA, Harvard, Vancouver, ISO, and other styles

10

Bolucek, Muhsin Alperen. "Design And Implementation Of Low Phase Noise Phase Locked Loop Based Local Oscillator." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611353/index.pdf.

Full text

Abstract:

In this thesis, a low phase noise local oscillator operating at 2210 MHz is designed and implemented to be used in X-Band transmitter of a LEO satellite. Designed local oscillator is a PLL (Phase Locked Loop) based frequency synthesizer which is implemented using discrete commercial components including ultra low noise voltage controlled oscillator and high resolution, low noise fractional-N synthesizer. Operational settings of the synthesizer are done using three wire serial interface of a microcontroller. Although there are some imperfections in the implementation, phase noise of the prototy

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Low frequency radar"

1

Ferra, S. J. A low phase noise phase-locked loop up-converter for use on frequency hopping radar systems. 1987.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Jones, William John. Direct frequency synthesis using combined digital and analogue techniques: Application of combined digital and analogue techniques in the direct synthesis of frequency agile low-noise microwave signals for airborne radar and in generation of band-limited digital signals. 1988.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

(US), National Research Council. An Assessment of Potential Health Effects from Exposure to PAVE PAWS Low-Level Phased-Array Radiofrequency Energy. National Academies Press, 2005.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

An assessment of potential health effects from exposure to PAVE PAWS low-level phased-array radiofrequency energy. National Academies Press, 2005.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Low frequency radar"

1

Vignesh, R., G. A. Shanmugha Sundaram, and R. Gandhiraj. "Phase-Modulated Stepped Frequency Waveform Design for Low Probability of Detection Radar Signals." In Intelligent Systems, Technologies and Applications. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6095-4_14.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Varma, T. A. N. S. N., and Anjaneyulu Gera. "Frequency Hopping Patterns for Low Probability of Intercept (LPI) Radars Using Costas Arrays." In Lecture Notes in Electrical Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2818-4_43.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Eslami, Akbar. "Real-Time FMCW Radar X-Band Signal Acquisition and Visualization." In Strategic Innovations and Interdisciplinary Perspectives in Telecommunications and Networking. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8188-8.ch008.

Full text

Abstract:

The recent developments in the remote sensing technologies have resulted in large amounts of data transmitted from spaceborne sensors. To keep up with the volume, speed, and variety of these data, new data acquisition and visualization systems need to be developed. This chapter focuses on some design and development considerations for a real-time data acquisition and visualization of X-band in a frequency-modulated continuous wave (FMCW) radar. Relevant issues such as high-speed network, parallel data processing system, and large-scale storage system are discussed. Ideally, the acquisition system should be capable of concurrent processing at low cost and visualization technique should be in the same time scale with other conventional 2D visualization of X-band weather radars. Benefits of this type of radar are that it is not just safe and inexpensive, but also serves as a means in filling in gaps of higher-powered pulse-doppler radars when used in conjunction with them.

APA, Harvard, Vancouver, ISO, and other styles

4

Michael Wu, Chung-Tse, and Pai-Yen Chen. "Low-Profile Metamaterial-Based Adaptative Beamforming Techniques." In Modern Printed-Circuit Antennas. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.90012.

Full text

Abstract:

In this chapter, we will review recent research advances on beamforming and spatial multiplexing techniques using reconfigurable metamaterials (MTMs) and metasurfaces. This chapter starts by discussing basic principles and practical applications of transmission line-based metamaterials and planar metasurfaces, followed by their active versions that enable novel smart antennas with beam steering and beamshaping functions. We include detailed descriptions of their practical realizations and the integration with circuits and the radio-frequency (RF) frontend, which are used to adaptively and dynamically manipulate electromagnetic radiation. We summarize the state-of-the-art MTM/metasurface-based beamforming techniques and provide a critical comparison for their uses in the RF-to-millimeter-wave range in terms of cost, reconfigurability, system integratability and radiation properties. These techniques are expected to pave the way for the massive deployment of communication, radar, remote sensing and medical and security imaging systems.

APA, Harvard, Vancouver, ISO, and other styles

5

Ng, Wan Yeen, and Xhiang Rhung Ng. "The Design and Modeling of 30 GHz Microwave Front-End." In Advances in Monolithic Microwave Integrated Circuits for Wireless Systems. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-60566-886-4.ch009.

Full text

Abstract:

This chapter aims to discuss a millimeter wave integrated circuit (MMWIC) in frequency of 30 GHz especially switch (SPDT), medium power amplifier (MPA) and low noise amplifier (LNA). The switch is developed using a commercial 0.15 µm GaAs pHEMT technology. It achieves low loss and high isolation for millimeter wave applications. The circuit and layout drawing of SPDT switch are done by using Advanced Design System (ADS) software. The layout is verified by running the Design Rules Check (DRC) to check and clear all the errors. At the operating frequency of 30 GHz, the reported SPDT switch has 1.470 dB insertion loss and 37.455 dB of isolation. It also demonstrates 26.00 dBm of input P1dB gain compression point (P1dB) and 22.975 dBm of output P1dB. At a supply voltage of 3.0 V and 30 GHz operating frequency, this two-stage LNA achieves an associated gain of 21.628 dB, noise figure (NF) of 2.509 dB and output referred 1-dB compression point (P1dB) of -11.0 dBm, the total power consumptions for the LNA is 174 mW. At a supply voltage of 6.0 V and 30 GHz operating frequency, a 2-stage MPA achieves a linear gain (S21) of 13.236 dB, P1dB of 22.5 dBm, power gain of 11.055 dB and the PAE of 14.606%. The total power consumption for the MPA is 1.122 W. The 30 GHz LNA and PA can be applied in direct broadcast satellite (DBS), automotive radar transmitter and receiver.

APA, Harvard, Vancouver, ISO, and other styles

6

Aydin, Ali, Erdal Akyol, Mahmud Gungor, Ali Kaya, and Suat Tasdelen. "Geophysical Surveys in Engineering Geology Investigations With Field Examples." In Advances in Civil and Industrial Engineering. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2709-1.ch007.

Full text

Abstract:

This chapter focusses on geophysical survey techniques, employed in engineering geological investigations and it includes case studies. Goal of a geophysical study in an engineering geological research is to display discontinuities in the rock masses, physico-mechanical properties of soils and rocks, groundwater exploration, faults, landslides, etc. It is also helpful to learn type and thickness of soil, layer inclination. These techniques include engineering geological surface mapping, geotechnical drilling and in situ testing.Then the obtained geophysical field data are analyzed and interpreted in conjunction with the results of geological information.The most common geophysical methods namely seismic, magnetometric, vertical electrical sounding (VES), Very Low Frequency (VLF) Electromagnetics methods, ground penetration radar (GPR) provide sufficient information about the subsurface although they have their limitations, setting up the minimum tests requirements in relation to the type of the geological formations.

APA, Harvard, Vancouver, ISO, and other styles

7

M. Mansour, Mohamed, and Haruichi Kanaya. "Tunable Zeroth-Order Resonator Based on Ferroelectric Materials." In Multifunctional Ferroelectric Materials. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98475.

Full text

Abstract:

Tunable microwave devices have the benefits of added functionality, smaller form factor, lower cost, and lightweight, and are in great demand for future communications and radar applications as they can extend the operation over a wide dynamic range. Current tunable technologies include several schemes such as ferrites, semiconductors, microelectromechanical systems (MEMS), and ferroelectric thin films. While each technology has its own pros and cons, ferroelectric thin film-based technology has proved itself as the potential candidate for tunable devices due to its simple processes, low power consumption, high power handling, small size, and fast tuning. A tunable Composite Right Left-Handed Zeroth Order Resonator (CRLH ZOR) is introduced in this chapter and it relies mainly on the latest advancement in the ferroelectric materials. It is common that for achieving optimum performance for the resonant structure, this involves the incorporation of an additional tuning by either mechanical means (i.e. with tuning screws) or other coupling mechanisms. The integration between electronic tuning and High-Temperature Superconducting (HTS) components yields a high system performance without degradation of efficiency. This leads not only low-loss microwave components that could be fine-tuned for maximum efficiency but will provide a tunable device over a broadband frequency spectrum as well. The dielectric properties of the ferroelectric thin film, and the thickness of the ferroelectric film, play a fundamental role in the frequency or phase tunability and the overall insertion loss of the circuit. The key advantages of using ferroelectric are the potential for significant size-reduction of the microwave components and systems and the cabibility for integration with microelectronic circuits due to the utilization of thin and thick ferroelectric film technology. In this chapter, ZOR is discussed and the conceptual operation is introduced. The ZOR is designed and simulated by the full-wave analysis software. The response is studied using electromagnetic characteristics with the applied electric field, ferroelectric thickness, and the operating temperature.

APA, Harvard, Vancouver, ISO, and other styles

8

Amanathulla, Sk, and Madhumangal Pal. "L(h,k)-Labeling of Intersection Graphs." In Handbook of Research on Advanced Applications of Graph Theory in Modern Society. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9380-5.ch007.

Full text

Abstract:

One important problem in graph theory is graph coloring or graph labeling. Labeling problem is a well-studied problem due to its wide applications, especially in frequency assignment in (mobile) communication system, coding theory, ray crystallography, radar, circuit design, etc. For two non-negative integers, labeling of a graph is a function from the node set to the set of non-negative integers such that if and if, where it represents the distance between the nodes. Intersection graph is a very important subclass of graph. Unit disc graph, chordal graph, interval graph, circular-arc graph, permutation graph, trapezoid graph, etc. are the important subclasses of intersection graphs. In this chapter, the authors discuss labeling for intersection graphs, specially for interval graphs, circular-arc graphs, permutation graphs, trapezoid graphs, etc., and have presented a lot of results for this problem.

APA, Harvard, Vancouver, ISO, and other styles

9

Sabban, Albert. "Ultra-Wideband MM Wave System and RF Modules." In Innovations in Ultra-Wideband Technologies. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97853.

Full text

Abstract:

Compact wideband RF modules are crucial in mm-wave direction finding systems, radars, seekers, and communication systems. This chapter discusses new integrated wideband mm-wave RF modules. It also discusses the design and development of a compact wideband (18–40 GHz) frontend and a wideband (18–40 GHz) switch bank filter (SBF). The frontend electrical specifications determine the system signal-to-noise ratio and the system dynamic range. This chapter presents a low-cost integrated 18–40 GHz wideband compact frontend with a 47 dBm high power limiter. The frontend consists of two channels: a high gain and low gain channel. Wideband MMIC switches are employed to select the required channel. The gain of the high gain channel is around 27 dB with ±1 dB flatness. The noise figure of the module is around 9 dB. This chapter also presents a low-cost, integrated, 18–40 GHz wideband compact SFB module. The wideband SFB consists of three wideband side-coupled microstrip filters. The SFB MIMIC switches operate in the 18 to 40 GHz frequency range and are used to select the required filter. The insertion loss of each filter section is less than 11.5 dB ±1.5 dB. The novelty of this research is the development of compact, integrated wideband mm-wave RF modules for direction finding and communication systems.

APA, Harvard, Vancouver, ISO, and other styles

10

Posner, Michael I. "Integrating Technologies in the Study of Attentional Networks." In The Role of Technology in Clinical Neuropsychology. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190234737.003.0022.

Full text

Abstract:

The literature supports the idea that attention is not a unified concept, but involves separate mechanisms that support its varied functions (Petersen & Posner, 2012). One common taxonomy involves three such functions: obtaining and maintaining the alert state, orienting to sensory stimuli, and resolving conflict among competing responses. Each of the functions has a long history and has spawned tests designed to measure individual differences in attention. Many individual tests and batteries of tests are designed to measure attention. Tests of vigilance usually involve maintaining attention over long periods of time, originally simulating the job of scanning radar returns for low-probability targets (Mackworth, 1969; Parasuraman, 1985). Another approach is to require responses to infrequent events, as in the continuous performance test (Rosvold et al., 1956) or the serial response test (Manly et al., 1999). Vigilance varies with the diurnal rhythm and vigilance can be reduced by sleep deprivation. Collectively, the tests of performance during continuous tasks are often called measures of tonic alertness, which is thought to change rather slowly. It is also possible to cause phasic shifts of the level of alertness by the use of warning signals (Nickerson, 1967). A warning signal can bring a person from a relatively relaxed state to one fostering the very best performance within less than half a second. Recent fMRI studies have defined a default state in which a person is off task (Raichle, 2009). It seems likely that scalp electrodes recording direct current shifts following warning signals called the contingent negative variation (CNV) capture the shift from the default to the alert state. The most frequently studied area in attention research involves orienting to a sensory source that contains a target. For example, in a visual search, a target may be defined as a red triangle. If it appears in a field that contains other colored triangles and red forms other than triangles, one can ensure that the field is carefully searched until the target is found.

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Low frequency radar"

1

Morvan, Sylvain, and Olivier Vacus. "RCS analysis and classification in the Low Frequency domain." In 2014 International Radar Conference (Radar). IEEE, 2014. http://dx.doi.org/10.1109/radar.2014.7060261.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Tang, Liang, Yongfeng Zhu, Yingzhi Kan, and Qiang Fu. "Sparse frequency waveform design with low autocorrelation sidelobes." In 2016 CIE International Conference on Radar (RADAR). IEEE, 2016. http://dx.doi.org/10.1109/radar.2016.8059189.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Yilong Lu. "Low frequency radar phenomenology study in equatorial vegetation - preliminary results." In 2002 International Radar Conference (Radar 2002). IEE, 2002. http://dx.doi.org/10.1049/cp:20020251.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Cetiner, Ramazan, and Altunkan Hizal. "Discrete Scanning Low Energy-Time Product Linear Frequency Diverse Array Radar." In 2019 International Radar Conference (RADAR). IEEE, 2019. http://dx.doi.org/10.1109/radar41533.2019.171301.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kuschel, H., J. Heckenbach, St Muller, and R. Appel. "On the potentials of passive, multistatic, low frequency radars to counter stealth and detect low flying targets." In 2008 IEEE Radar Conference (RADAR). IEEE, 2008. http://dx.doi.org/10.1109/radar.2008.4720984.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Davis, J. L., A. P. Annan, G. Black, and C. D. Leggatt. "Geologic sounding using low-frequency radar." In 1985 SEG Technical Program Expanded Abstracts. SEG, 1985. http://dx.doi.org/10.1190/1.1892799.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Papa, Claudio, Giovanni Alberti, Giuseppe Salzillo, et al. "Multimode multifrequency low frequency airborne radar." In 2012 Tyrrhenian Workshop on Advances in Radar and Remote Sensing (TyWRRS 2012). IEEE, 2012. http://dx.doi.org/10.1109/tywrrs.2012.6381137.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Scmcykin, N., A. Dudnik, and V. Monahov. "Low frequency through-wall radar-detector." In 15th International Conference on Ground-Penetrating Radar (GPR) 2014. IEEE, 2014. http://dx.doi.org/10.1109/icgpr.2014.6970540.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Shanna Zhuang, Yapeng He, and Xiaohua Zhu. "Designing sparse frequency waveform with low range sidelobes for HFSWR." In 2011 IEEE CIE International Conference on Radar (Radar). IEEE, 2011. http://dx.doi.org/10.1109/cie-radar.2011.6159611.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Vulcan, A., and M. Bloch. "Low Noise Airborne Synthesizer for Frequency Agile Radar." In 41st Annual Symposium on Frequency Control. IEEE, 1987. http://dx.doi.org/10.1109/freq.1987.201072.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Low frequency radar"

1

Simms, Janet, Benjamin Breland, and William Doll. Geophysical investigation to assess condition of grouted scour hole : Old River Control Complex—Low Sill Concordia Parish, Louisiana. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41863.

Full text

Abstract:

Geophysical surveys, both land-based and water-borne, were conducted at the Old River Control Complex‒Low Sill, Concordia Parish, LA. The purpose of the surveys was to assess the condition of the grout within the scour region resulting from the 1973 flood event, including identification of potential voids within the grout. Information from the ground studies will also be used for calibration of subsequent marine geophysical data and used in stability analysis studies. The water-borne survey consisted of towed low frequency (16-80 MHz) ground penetrating radar (GPR), whereas the land-based surv

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!