Bibliografie tematiche / Radar

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Letteratura scientifica selezionata sul tema "Radar"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 marzo 2025

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Articoli di riviste sul tema "Radar"

Liu, Yuhang, Yu Shen, Lili Fan, Yonglin Tian, Yunfeng Ai, Bin Tian, Zhongmin Liu e Fei-Yue Wang. "Parallel Radars: From Digital Twins to Digital Intelligence for Smart Radar Systems". Sensors 22, n. 24 (16 dicembre 2022): 9930. http://dx.doi.org/10.3390/s22249930.

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Radar is widely employed in many applications, especially in autonomous driving. At present, radars are only designed as simple data collectors, and they are unable to meet new requirements for real-time and intelligent information processing as environmental complexity increases. It is inevitable that smart radar systems will need to be developed to deal with these challenges and digital twins in cyber-physical systems (CPS) have proven to be effective tools in many aspects. However, human involvement is closely related to radar technology and plays an important role in the operation and management of radars; thus, digital twins’ radars in CPS are insufficient to realize smart radar systems due to the inadequate consideration of human factors. ACP-based parallel intelligence in cyber-physical-social systems (CPSS) is used to construct a novel framework for smart radars, called Parallel Radars. A Parallel Radar consists of three main parts: a Descriptive Radar for constructing artificial radar systems in cyberspace, a Predictive Radar for conducting computational experiments with artificial systems, and a Prescriptive Radar for providing prescriptive control to both physical and artificial radars to complete parallel execution. To connect silos of data and protect data privacy, federated radars are proposed. Additionally, taking mines as an example, the application of Parallel Radars in autonomous driving is discussed in detail, and various experiments have been conducted to demonstrate the effectiveness of Parallel Radars.

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Protat, Alain, Valentin Louf, Joshua Soderholm, Jordan Brook e William Ponsonby. "Three-way calibration checks using ground-based, ship-based, and spaceborne radars". Atmospheric Measurement Techniques 15, n. 4 (21 febbraio 2022): 915–26. http://dx.doi.org/10.5194/amt-15-915-2022.

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Abstract. This study uses ship-based weather radar observations collected from research vessel Investigator to evaluate the Australian weather radar network calibration monitoring technique that uses spaceborne radar observations from the NASA Global Precipitation Mission (GPM). Quantitative operational applications such as rainfall and hail nowcasting require a calibration accuracy of ±1 dB for radars of the Australian network covering capital cities. Seven ground-based radars along the western coast of Australia and the ship-based OceanPOL radar are first calibrated independently using GPM radar overpasses over a 3-month period. The calibration difference between the OceanPOL radar (used as a moving reference for the second step of the study) and each of the seven operational radars is then estimated using collocated, gridded, radar observations to quantify the accuracy of the GPM technique. For all seven radars the calibration difference with the ship radar lies within ±0.5 dB, therefore fulfilling the 1 dB requirement. This result validates the concept of using the GPM spaceborne radar observations to calibrate national weather radar networks (provided that the spaceborne radar maintains a high calibration accuracy). The analysis of the day-to-day and hourly variability of calibration differences between the OceanPOL and Darwin (Berrimah) radars also demonstrates that quantitative comparisons of gridded radar observations can accurately track daily and hourly calibration differences between pairs of operational radars with overlapping coverage (daily and hourly standard deviations of ∼ 0.3 and ∼ 1 dB, respectively).

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Luong, David, Sreeraman Rajan e Bhashyam Balaji. "Quantum Monopulse Radar". Applied Computational Electromagnetics Society 35, n. 11 (5 febbraio 2021): 1430–32. http://dx.doi.org/10.47037/2020.aces.j.351184.

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We evaluate the feasibility of a quantum monopulse radar, focusing on quantum illumination (QI) radars and quantum two-mode squeezing (QTMS) radars. Based on their similarity with noise radar, for which monopulse operation is known to be possible, we find that QTMS radars can be adapted into monopulse radars, but QI radars cannot. We conclude that quantum monopulse radars are feasible.

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Oh, Soo Young, Kyu Ho Cha, Hayoung Hong, Hongsoo Park e Sun K. Hong. "Measurement of Nonlinear RCS of Electronic Targets for Nonlinear Detection". Journal of Electromagnetic Engineering and Science 22, n. 4 (31 luglio 2022): 447–51. http://dx.doi.org/10.26866/jees.2022.4.r.108.

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The conventional radar technology is based on linear detection—i.e., the same transmit and receive frequencies are used. However, with linear radars, difficulties arise when detecting electronic objects with relatively small radar cross section (RCS). To overcome these limitations, a nonlinear radar that can detect nonlinear responses (i.e., harmonic and intermodulation) scattered by electronic devices due to nonlinear interaction can be utilized. Nonlinear radars require a different analysis from linear radars for analyzing RCS. In this paper, we present an experimental analysis of the nonlinear RCS of various electronic devices. Unlike linear radars, RCS in nonlinear radars is determined by the amount of nonlinear responses backscattered to the radar. Therefore, we derive a radar equation accustomed to harmonic radars that consists of nonlinear RCS. We then obtain and analyze the nonlinear RCS of various targets from the measured harmonic responses of the targets based on the nonlinear radar equation.

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Lakshmanan, Valliappa, Travis Smith, Kurt Hondl, Gregory J. Stumpf e Arthur Witt. "A Real-Time, Three-Dimensional, Rapidly Updating, Heterogeneous Radar Merger Technique for Reflectivity, Velocity, and Derived Products". Weather and Forecasting 21, n. 5 (1 ottobre 2006): 802–23. http://dx.doi.org/10.1175/waf942.1.

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Abstract With the advent of real-time streaming data from various radar networks, including most Weather Surveillance Radars-1988 Doppler and several Terminal Doppler Weather Radars, it is now possible to combine data in real time to form 3D multiple-radar grids. Herein, a technique for taking the base radar data (reflectivity and radial velocity) and derived products from multiple radars and combining them in real time into a rapidly updating 3D merged grid is described. An estimate of that radar product combined from all the different radars can be extracted from the 3D grid at any time. This is accomplished through a formulation that accounts for the varying radar beam geometry with range, vertical gaps between radar scans, the lack of time synchronization between radars, storm movement, varying beam resolutions between different types of radars, beam blockage due to terrain, differing radar calibration, and inaccurate time stamps on radar data. Techniques for merging scalar products like reflectivity, and innovative, real-time techniques for combining velocity and velocity-derived products are demonstrated. Precomputation techniques that can be utilized to perform the merger in real time and derived products that can be computed from these three-dimensional merger grids are described.

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Perelygin, B. V., e A. M. Luzbin. "Construction of a continuous radar field of a hydrometeorological monitoring system based on a geometric approach". Radiotekhnika, n. 191 (22 dicembre 2017): 173–80. http://dx.doi.org/10.30837/rt.2017.4.191.17.

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The concept of a continuous radar field generated by a system of meteorological radars is considered. To accommodate meteorological radars, it is proposed to apply a geometric approach, which consists in arranging meteorological radar stations at the vertices of various polygons and which greatly simplifies the construction of the required radar field. Quantitative indicators for estimating the quality of the radar field and the results of their calculations for various variants of constructing the radar field are proposed.

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Johnston, Paul E., James R. Jordan, Allen B. White, David A. Carter, David M. Costa e Thomas E. Ayers. "The NOAA FM-CW Snow-Level Radar". Journal of Atmospheric and Oceanic Technology 34, n. 2 (febbraio 2017): 249–67. http://dx.doi.org/10.1175/jtech-d-16-0063.1.

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AbstractA vertically pointing radar for monitoring radar brightband height (BBH) has been developed. This new radar utilizes frequency-modulated continuous wave (FM-CW) techniques to provide high-resolution data at a fraction of the cost of comparable pulsed radars. This S-band radar provides details of the vertical structure of precipitating clouds, with full Doppler information. Details of the radar design are presented along with observations from one storm. Results from a calibration using these storm data show the radar meets the design goals. Eleven of these radars have been deployed and provide BBH data in near–real time.

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BHAT, G. S., J. VIVEKANANDAN e D. PRADHAN. "Evolution of Radar Meteorology in India and the latest trends". MAUSAM 76, n. 1 (16 gennaio 2025): 55–64. https://doi.org/10.54302/mausam.v76i1.6497.

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Weather radar is an indispensable tool in the continuous monitoring and warning of extreme events including tropical cyclones and thunderstorms. The India Meteorological Department (IMD) has been operating radars since 1949. The evolution of radar meteorology in India may be divided into three broad phases, namely, the 1950s (phase-I), then up to the year 2000 (phase-II), and thereafter (phase-III). During phase-I, radars were imported and installed in cities to aid aircraft operations. Photographs of radar scopes were analysed to provide a broad understanding of temporal evolution and spatial extent of precipitating clouds in different parts of the country and seasons. During phase-II, storm warning (X-band) and cyclone warning (S-band) radars with more power and range were installed, and some of them were indigenous. Phase-III ushered in the era of digital Doppler weather radars in India. Interfacing between numerical models and radars started in phase-III including assimilation of radar winds and model verification. Installation and operation of weather radars outside IMD also started in phase-III. Important areas where more work needs to be done include a well-trained workforce in radar meteorology, radar calibration and data standardization, radar area coverage and networking, algorithms for quantitative precipitation estimation using polarimetric products, assimilation of radar products in numerical models, research on cloud physics and dynamics, applications of AI/ML in storm and severe weather nowcasting.

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Wang, Dingyang, Sungwon Yoo e Sung Ho Cho. "Experimental Comparison of IR-UWB Radar and FMCW Radar for Vital Signs". Sensors 20, n. 22 (23 novembre 2020): 6695. http://dx.doi.org/10.3390/s20226695.

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In this paper, we compare the performances of impulse radio ultra-wideband (IR-UWB) and frequency modulation continuous wave (FMCW) radars in measuring noncontact vital signs such as respiration rate and heart rate. These two type radars have been widely used in various fields and have shown their applicability to extract vital signs in noncontact ways. IR-UWB radar can extract vital signs using distance information. On the other hand, FMCW radar requires phase information to estimate vital signs, and the result can be enhanced with Multi-input Multi-output (MIMO) antenna topologies. By using commercial radar chipsets, the operation of radars under different conditions and frequency bands will also affect the performance of vital sign detection capabilities. We compared the accuracy and signal-to-noise (SNR) ratios of IR-UWB and FMCW radars in various scenarios, such as distance, orientation, carotid pulse, harmonics, and obstacle penetration. In general, the IR-UWB radars offer a slightly better accuracy and higher SNR in comparison to FMCW radar. However, each radar system has its own unique advantages, with IR-UWB exhibiting fewer harmonics and a higher SNR, while FMCW can combine the results from each channel.

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Vidal, Luis E., Ulises Román Concha, Justo Solís, José Piedra, Carlos Chávez, Dominga M. Cano e Juan C. Woolcott. "Implementation of a Transportable Radar Mode S of Monopulse Secondary Surveillance (MSSR-S) for the Peruvian Civil Aviation Surveillance". Telecom 4, n. 4 (3 ottobre 2023): 693–708. http://dx.doi.org/10.3390/telecom4040031.

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This article describes the process of implementing a transportable radar MSSR-S for Peruvian civil aviation (ACP) to minimize the operational impact in emergencies that affects air traffic without causing structural damage and restore data from the radar in a short time. In recent years, ACP has shown constant falls in the radars, causing radar data to be lost for long periods of time and putting air safety at risk due to the lack of maintenance and overlapping radar coverage of more than three radars. The deployment of the transportable radar in Mode S of Monopulse Secondary Surveillance (MSSR-S) has allowed for work that involves the prolonged stoppage of the radar to be carried out and provided coverage to eight more radars during maintenance and modernization, covering the areas without coverage in the Peruvian air space (EAP). For the implementation, this was divided into three SPRINTs using the SCRUM methodology; the first sprint refers to the equipment and radar coverage study, the second the implementation and service test phase, and the third the operational analysis phase with the eight modernized radars. As a result of the implementation and integration with the other ACP radar systems, they were able to operate together, providing highly reliable radar data, performing a continuous analysis of radar performance through the PASS software, complying with the thresholds established by ICAO and EuroControl, and guaranteeing that the systems operate under perfect conditions and with full coverage at all time.

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Tesi sul tema "Radar"

Geladakis, Dimitrios N. "Comparison of the step frequency radar with the conventional constant frequency radars". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA328272.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1996.
"December 1996." Thesis advisor(s): Gurnam S. Gill. Includes bibliographical references (p. 45). Also available online.

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Karlsen, Jan Sigurd. "Radar målfølging". Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10444.

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Kongsberg Defense & Aerospace (KDA) benytter radarer av typen phased array i deres luftvernsystemer. På bakgrunn av nødvendige egenskaper som elektronisk styring av radarstråle tas denne radartypen også i bruk i denne oppgaven. En tilgjengelig signalkilde fra radaren er SNR data som brukes for utbedring av målfølgingen. På bakgrunn av valgt radar er det fremlagt beskrivelser for hvordan oppstart og avslutning av målfølging kan gjennomføres. Metoder for generering av observasjonsdata og observasjonsstøy er tilpasset SNR data innhentet fra radaren. Observasjonsdata er generert ved monopulsbasert og vinkelbasert metode i form av Amplitude Comparison Monopulse (ACM) og Sequential Lobing (SL). Observasjonsstøy er generert ved Bartons, NOAHs og vinkelstøybasert metode, der sistnevnte er utledet fra SL algoritmen. Samtlige metoder er beskrevet matematisk og funksjonelt. To forskjellige typer algoritmer basert på Kalman-filter (KF) er brukt for estimering. Disse benytter forskjellige metoder for å følge manøvrerende mål. Utvidet KF, Extended Kalman-filter (EKF), er satt i sammen med en manøverdeteksjonsalgoritme og Samvirkende multiple modeller, Interacting Multiple Modell (IMM), filter benytter sannsynlighetsberegninger for å skille mellom en hastighetsmodell og en akselerasjonsmodell. Sammensetninger av målfølgealgoritmer basert på modeller for observasjonsdata, observasjonsstøy og estimering er implementert i Matlab 2007a og simulert i manøvrerende miljø med ulik grad av akselerasjon og manøvrerbarhet. Det er vist at det mulig å generere tilstrekkelig nøyaktige observasjonsdata ved å benytte SNR data fra radar med vinkelbasert metode. Monopulsbasert metode gir større avvik i form av bias og er dermed uegnet for bruk med filtrene som brukes for estimering. Observasjonsstøy lar seg tilnærme med tilstrekklig nøyaktighet ved NOAHs og vinkelstøybasert metode. Bartons metode avhenger for lite av differansen i SNR dataene og genererer dermed for unøyaktige støydata for estimatorene. På bakgrunn av resultater fra ulike projeksjoner og statistiske beregninger er det vist at EKF og IMM filteret fungerer godt som estimatorer. IMM filteret gir noe bedre resultater ved manøvre grunnet bedre manøverhåndteringsmetoder. Allikevel fremgår det av konsistenstesten at IMM filteret er optimistisk ved harde manøvre, noe som kan skyldes en dårlig tilpasset akselerasjonsmodell. Både EKF og IMM filteret ble realisert med variabel målestøy i form av generert observasjonsstøy, og dette viste seg å gi vesentlig større nøyaktighet i estimatene. Det er altså vist at en fullstendig målfølgealgoritme lar seg realisere med tilgjengelige SNR data fra radarer av typen phased array, og at nøyaktigheten kan forbedres ved å innføre variabel målestøy basert på de samme SNR dataene.

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Gouveia, Carolina Teixeira de Sousa. "Bio-Radar". Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23811.

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Mestrado em Engenharia Eletrónica e Telecomunicações
Nesta dissertação é desenvolvido um protótipo de um bio-radar, cujo foco é a aquisição e processamento do sinal respiratório em tempo real. O sistema do bio-radar permite medir sinais vitais com precisão, baseando-se no princípio do efeito Doppler, que relaciona as propriedades do sinal recebido com a variação da distância percorrida desses sinais. Essa distância está compreendida entre as antenas do radar e a caixa torácica do paciente. No contexto deste projeto, é apresentado o modelo matemático do bio-radar e é também desenvolvido um algoritmo que visa extrair o sinal respiratório tendo em consideração a sensibilidade dos sinais envolvidos tal como o modo de operação do sistema. O protótipo em tempo real desenvolvido nesta dissertação usa um front-end baseado em Software Defined Radio (SDR) e os sinais por ele adquiridos são processados no software LabVIEW da National Instruments.
In this dissertation, a prototype of a bio-radar was developed with focus in the real-time acquisition and processing of the respiratory signal. The bio-radar system can measure vital signals accurately by using the Doppler e ect principle that relates the received signal properties with the distance change between the radar antennas and the person's chest-wall. In this framework, a mathematical model of the bio-radar is presented. Also, an algorithm for respiratory rate extraction is proposed having in mind the acquired signal's sensitivity and the system's operation. The real-time acquisition system is developed using a front-end based in SDR and the acquired signals are processed using the LabVIEW software from National Instruments.

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Yong, Siow Yin. "Radar polarimetry". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FYong.pdf.

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Fabry, Frédéric. "Precipitation estimates by radar : a zenith pointing radar perspective". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59887.

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Data collected from zenith pointing radar is used to study the range dependence of some meteorological radar errors associated with different sampling methods between radar and gauges in stratiform precipitation. Errors due to the vertical variation of reflectivity such as those related with the bright band or with snow growth cause a much larger bias in radar estimates than those due to beam filling or gradients. The maximum useful range varies with the bright band height and the elevation angle program used, a CAPPI giving superior results especially for snow. The sudden changes in bright band height over short distances and the large scatter of its thickness limit the accuracy of current corrections for the vertical variation of reflectivity based on scanning radar data. The possibility of using a zenith pointing radar to obtain this correction is discussed.

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Löhner, Andreas. "Ein Beitrag zum Verbessern der azimutalen Auflösung vorwärtsschauender Radarsysteme mit synthetischer Apertur /". Düsseldorf : VDI-Verl, 1999. http://www.gbv.de/dms/bs/toc/300868324.pdf.

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Lane, Andrew. "Real-time weather radar correlation using a vertically pointing radar". Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244841.

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Frankford, Mark Thomas. "EXPLORATION OF MIMO RADAR TECHNIQUES WITH A SOFTWARE-DEFINED RADAR". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306526246.

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Ahmed, Atheeq. "Human Detection Using Ultra Wideband Radar and Continuous Wave Radar". Thesis, Linköpings universitet, Kommunikationssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-137996.

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A radar works by radiating electromagnetic energy and detecting the reflected signal returned from the target. The nature of the reflected signal provides information about the target’s distance or speed. In this thesis, we will be using a UWB radar and a CW radar to help detect the presence and rough location of trapped survivors by detecting their motions. Range is estimated in the UWB radar using clutter removal with SVD and for the dual frequency CW Radar using STFT and median filtering. The effect of the algorithm parameters on their performance was analyzed. The performance of the implemented algorithms with regards to small motion detection, distance estimation and penetration capability was analyzed. Both systems are certainly capable of human detection and tracking.

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Ravichandran, Kulasegaram. "Radar imaging using two-dimensional synthetic aperture radar (SAR) techniques /". abstract and full text PDF (UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1446797.

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Thesis (M.S.)--University of Nevada, Reno, 2007.
Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2008]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.

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Libri sul tema "Radar"

S, Hall P., a cura di. Radar. London: Brassey's (UK), 1991.

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Olafson, Richard. Radar. Victoria, B.C: Ekstasis Editions, 1990.

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International, Conference Radar (1997 Edinburgh Scotland). Radar 97. [London: IEE, 1997.

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Kirk, Andy. Radar Chart. 1 Oliver’s Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2016. http://dx.doi.org/10.4135/9781529776942.

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Lanzagorta, Marco. Quantum Radar. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-031-02515-0.

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Cherniakov, Mikhail, a cura di. Bistatic Radar. Chichester, UK: John Wiley & Sons, Ltd, 2008. http://dx.doi.org/10.1002/9780470985755.

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Hanssen, Ramon F. Radar Interferometry. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/0-306-47633-9.

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Cherniakov, Mikhail, a cura di. Bistatic Radar. Chichester, UK: John Wiley & Sons, Ltd, 2007. http://dx.doi.org/10.1002/9780470035085.

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Lynn, Paul A. Radar Systems. London: Macmillan Education UK, 1987. http://dx.doi.org/10.1007/978-1-349-18748-5.

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Raghavan, S. Radar Meteorology. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0201-0.

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Capitoli di libri sul tema "Radar"

Schroeder, Manfred R. "Radar". In Acoustics, Information, and Communication, 329–36. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05660-9_17.

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Chaturvedi, Prakash Kumar. "Radar". In Microwave, Radar & RF Engineering, 333–53. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7965-8_9.

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Lertes, Erwin. "Radar". In Funkortung und Funknavigation, 60–83. Wiesbaden: Vieweg+Teubner Verlag, 1995. http://dx.doi.org/10.1007/978-3-663-12124-4_4.

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Unger, H. G. "Radar". In Hochfrequenztechnik in Funk und Radar, 201–20. Wiesbaden: Vieweg+Teubner Verlag, 1988. http://dx.doi.org/10.1007/978-3-663-12417-7_9.

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Unger, H. G. "Radar". In Hochfrequenztechnik in Funk und Radar, 229–48. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-663-10313-4_10.

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Terheyden, Karl, e Gerhard Zickwolff. "Radar". In Navigation, 120–250. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-21924-9_3.

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Abraham-Inpijn, Luzi. "Radar". In Tandarts in de knel, 155–61. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1442-3_16.

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Barkeshli, Kasra, e Sina Khorasani. "Radar". In Advanced Electromagnetics and Scattering Theory, 213–29. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11547-4_5.

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Shekhar, Shashi, e Hui Xiong. "RADAR". In Encyclopedia of GIS, 943. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_1070.

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Kozlov, Anatoly Ivanovich, Yuri Grigoryevich Shatrakov e Dmitry Alexandrovich Zatuchny. "Radar". In Radar and Radionavigation, 1–32. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6191-5_1.

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Atti di convegni sul tema "Radar"

O'Connell, Barbara J. "Ice Hazard Radar". In SNAME 9th International Conference and Exhibition on Performance of Ships and Structures in Ice. SNAME, 2010. http://dx.doi.org/10.5957/icetech-2010-179.

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Ships transiting polar regions would benefit from a marine ice navigation radar that could help them differentiate between dangerous multi-year ice and thick first-year ice. Conventional marine radars are designed for target detection and avoidance. Enhanced marine radars provide a higher definition image of the ice that the vessel is transiting through and may help the user to identify certain ice features, but they cannot distinguish first year ice from old ice. This paper presents one approach for the automated identification of sea ice types by a marine radar using cross-polarization technology.

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Shapiro, Jeffrey H. "Laser Radar System Theory*". In Optical Remote Sensing. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ors.1985.tub3.

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Coherent laser radars represent a true translation to the optical frequency band of conventional microwave radar concepts. Moreover, the emerging technology of compact CO2 laser radars may be capable of resolving targets in any combination of the modalities of space, angle, range, and velocity. As a result, the development of laser radar system theory as an analytic tool for the design and performance evaluation of such systems must function on a variety of levels. In this paper, three of these levels will be reviewed.

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Yoshikado, Shin, e Tadashi Aruga. "Investigation of Conceptual Synthetic Aperture Infrared Laser Radars". In Coherent Laser Radar. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/clr.1995.wa1.

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Synthetic aperture radars(SAR) have widely been used for high-resolution imaging of the earth's and planets' surfaces. In microwave remote sensing fields, aperture synthesis usually means the signal processing for obtaining an image of the area sequentially illuminated by the radar wave emitted from a single moving real aperture. It is a technique now in well-established stages for radio wavelengths.

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Eberhard, Wynn L., Janet M. Intrieri e Graham Feingold. "Lidar and Radar as Partners in Cloud Sensing". In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/orsa.1997.omb.1.

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Clouds are important to radiative transfer and climate, so information on their structure and microphysics is in great demand. The improving technology of lidars and radars can meet many of these important observational needs. Lidar and radar can individually provide valuable but limited information on cloud properties. An amalgam of measurements by lidar, radar, spectrometer, infrared radiometer, microwave radiometer, and standard meteorological measurements yields a wealth of geometrical, microphysical, and radiative information unattainable by a single instrument (Sassen 1995; Intrieri et al. 1995). In this paper we describe how simultaneous measurements by lidar and radar give complementary information on the bulk structure of clouds and synergistic information on cloud microphysical properties.

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Ribeiro, Eric O., Taina S. Ruchiga e Jose A. M. Lima. "A Brazilian Northeast Coast Wave Data Comparison: Radar vs Buoy". In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10290.

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Wave buoys are well known by its accuracy in measuring sea surface elevations while wave radars were developed later. Buoy’s motions are considered direct wave measurements while microwave radars use remote sensing for tracking the sea surface. Due to sensitivity to winds, sea surface roughness, rain, etc, it is a good practice to check radar data against buoys records. Even both systems installed being 6 km apart in a deep water region offshore northeast Brazilian shelf, there were differences in wave directional spectral parameters calculated by both equipments. The wave measurements at Sergipe and Alagoas basin were in good agreement in terms of significant wave height. Hs correlation was 91% and bias was only 0.06 m. A particular behavior of radar Hs when compared to buoy Hs was overestimation in high sea states and underestimation in low ones. Tp1 correlation was 69%, bias was 0.02 s and linear regression coefficient was 0.64. The worst correlated parameter was peak direction Dp1 with 60% of correlation for E-ESE directional band. Time series matched each other and showed the typical regional wave climate with Hs 1.0–2.0 m, Tp 6–10 s and Dp1 from E-ESE. The distinction between radar and the buoy directions is related to radar susceptibility to SE trade winds during Spring and Summer seasons. However, the difference did not diverge from prevailing wave regional climate.

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Steinvall, Ove. "Performance of coherent and direct detection laser radars for hard target applications". In Coherent Laser Radar. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/clr.1995.tha1.

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The first laser range finder (1961) used direct detection and since then a great number of direct detection system have become operational. Work on coherent laser radars began after the discovery of the CO2 laser by Patel in 1964. Since then coherent laser radars have been developed for range finding, wind measurements, vibration sensing, obstacle avoidance and advanced imaging. There are however very few operational coherent laser radars probably due to complexity and high costs. The main advantages of coherent detection over direct detection systems are instantaneous Doppler and shot noise limited detection. Many of laser radar functions can also be realized with direct detection. The direct detection systems are in general simpler. Recent development of efficient short wavelength laser sources might change this in favor of coherent systems but it might also lead to efficient direct detection systems. In this talk we will investigate performance for hard target laser radars using either type of detection. System examples for range finding, target imaging and obstacle avoidance/terrain following will be analyzed. Important parameter variations beside the system parameters include target/background characteristics, atmospheric attenuation and turbulence.

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Schiryy, Andrey. "USING OF EXPERIENCE IN THE DEVELOPMENT OF RADAR CAD IN THE DEVELOPMENT OF ALGORITHMS FOR ADAPTING OVER-THE-HORIZON RADARS TO THE IONOSPHERIC ENVIRONMENT". In CAD/EDA/SIMULATION IN MODERN ELECTRONICS 2021. Bryansk State Technical University, 2021. http://dx.doi.org/10.30987/conferencearticle_61c997ef58db34.29284003.

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The possibility of using the experience and developments gained during the creation of the radar CAD to the tasks of developing algorithms for adapting over-the-horizon radars to the ionospheric environment is discussed. Special attention is paid to the experience of complex radar simulation.

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Pijević, Darko, Aleksandar Ristić, Dragan Nikolić, Dejan Ivković e Zvonko Radosavljević. "An example of VHF radar signal processing". In 11th International Scientific Conference on Defensive Technologies - OTEX 2024, 381–85. Military Technical Institute, Belgrade, 2024. http://dx.doi.org/10.5937/oteh24068p.

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Track While Scan (TWS) radars are generally used in defense systems, which supervise the positions of the target and generate the measurements, scan by scan. They measure a target's coordinates, determine its trajectory, and predict its next location. The selection and adaptation of the technical requirements of the optimal hardware for processing and displaying the radar image is related to several serious challenges, such as the availability and price of components on the market, the type of modulation, frequency agility, shielding from interference, computational complexity of processing, type and technology of the antenna system. In the paper, a complete example of coherent hardware processing (reception and transmission) of signals for VHF band radar is proposed. The proposed hardware generates trigger signals, modulates the transmit signal, transmits via a semiconductor HPA transmitter and then at the reception receives signals in the analog domain, converts them, processes them and displays the radar image on the monitor. The numerical experiments have shown the possibility of signal processing in real time on the selected platform showed the justification of the application.

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Yao, I., E. M. Hauser, C. A. Bouman e A. M. Chiang. "Hybrid Signal Processor for Wideband Radar*". In Picosecond Electronics and Optoelectronics. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/peo.1985.wb2.

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The signal processing task for radar systems with large instantaneous bandwidth and wide range coverage stresses the throughput rate of conventional digital processors. In this paper, a hybrid analog signal processor for wideband pulse-Doppler radar1 is described. It offers the potential of a compact, high-throughput processor. In the processor, three types of analog signal processing devices are incorporated. They are: (1) a surface-acoustic-wave (SAW) convolver2 to perform programmable pulse compression for radar signals with 200-MHz instantaneous bandwidth in order to provide target range information with 0.75-m resolution, (2) optoelectronic sample-and-hold (S/H) circuits3 to perform the range gating function and the buffering of the sampled data into the Doppler processor, and (3) charge-coupled-device (CCD) matrix-matrix-product (MMP) chips4 to perform Doppler Fourier analysis in order to provide target velocity information.

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Schulz, P. A., e S. R. Henion. "Frequency-chirped solid state laser radars". In Coherent Laser Radar. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/clr.1991.wc1.

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Solid-state laser developments, including diode laser pumping, miniaturization, and new materials, have made compact, efficient, and long-lived lasers in the 1 to 2 μm range available.[1] In addition, high-quantum-efficiency receivers operating at room temperature exist in this range. Consequently, solid-state laser radars are being considered for many applications. For single-pulse coherent radar the product of the range resolution ΔR and the velocity resolution Δv, referred to as the product resolution, is equal to cλ/4, where λ, is the wavelength of the radiation. This product resolution improves (decreases) with decreasing wavelength (Fig. 1) providing further argument for the relatively short wavelength of the solid-state laser.

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Rapporti di organizzazioni sul tema "Radar"

Goodman, Nathan A. Cognitive Radar. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2010. http://dx.doi.org/10.21236/ada518604.

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Reed, John. Random Radar. Fort Belvoir, VA: Defense Technical Information Center, novembre 2007. http://dx.doi.org/10.21236/ada480122.

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Liang, Qilian. Studies on Radar and Non-radar Sensor Networks. Fort Belvoir, VA: Defense Technical Information Center, giugno 2006. http://dx.doi.org/10.21236/ada449291.

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Liang, Qilian. Compressive Sensing for Radar and Radar Sensor Networks. Fort Belvoir, VA: Defense Technical Information Center, dicembre 2013. http://dx.doi.org/10.21236/ada594976.

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Haimovich, Alexander M. MIMO Radar: A Multi-Sensor Spatially Diverse Radar Architecture. Fort Belvoir, VA: Defense Technical Information Center, agosto 2008. http://dx.doi.org/10.21236/ada495118.

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Robinson, S. D., e Y. Michaud. Ground penetrating radar. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/210372.

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Pilon, J. A. Ground Penetrating Radar. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/133641.

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Robinson, S., M. Burgess e S. Wolfe. Ground penetrating radar. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/299323.

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Martone, Anthony, David McNamara, Gregory Mazzaro e Abigail Hedden. Cognitive Nonlinear Radar. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2013. http://dx.doi.org/10.21236/ada570993.

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Sparrow, David A. Modeling Radar Clutter. Fort Belvoir, VA: Defense Technical Information Center, maggio 1991. http://dx.doi.org/10.21236/ada240965.

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