A multiple automatic test system of microwave radar performance is presented. The composition of the test system is introduced, the testing principle and its characteristic is discussed in detail. This new test system can be used to test the microwave radar power, receiver sensitivity or noise, antenna radiation patterns, angle-tracking performance, range performance and the radar's zero range correction.
{"title":"A multiple automatic test system of microwave radar performance","authors":"Chen Shenjian, Hu Yunhua, Wang Zhiyun","doi":"10.1109/ICR.1996.574527","DOIUrl":"https://doi.org/10.1109/ICR.1996.574527","url":null,"abstract":"A multiple automatic test system of microwave radar performance is presented. The composition of the test system is introduced, the testing principle and its characteristic is discussed in detail. This new test system can be used to test the microwave radar power, receiver sensitivity or noise, antenna radiation patterns, angle-tracking performance, range performance and the radar's zero range correction.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125180036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The new method is called single-channel electroscan quasi-monopulse direction finding (DF) technique. It adopts the electroscan to control the commutation of the directional beams to obtain the directional pulse amplitude (PA) information. The PA/sub 0/ from an omni-directional channel is taken as a reference. The process of the PA difference among the directional beams is based on constant difference PA principle. By consulting the RF-/spl Delta/PA-DOA (direction of arrival) table in the memory, the direction of radar signal is obtained. The advantages of the method are synthesized from multi-beam, PA comparison and electroscan DF techniques. Thus the system configuration is optimized, the cost is reduced and the performance is enhanced.
{"title":"A new method to find the direction of radar signal","authors":"Li Jinrui, Fan Gouping, Mei Qing","doi":"10.1109/ICR.1996.574547","DOIUrl":"https://doi.org/10.1109/ICR.1996.574547","url":null,"abstract":"The new method is called single-channel electroscan quasi-monopulse direction finding (DF) technique. It adopts the electroscan to control the commutation of the directional beams to obtain the directional pulse amplitude (PA) information. The PA/sub 0/ from an omni-directional channel is taken as a reference. The process of the PA difference among the directional beams is based on constant difference PA principle. By consulting the RF-/spl Delta/PA-DOA (direction of arrival) table in the memory, the direction of radar signal is obtained. The advantages of the method are synthesized from multi-beam, PA comparison and electroscan DF techniques. Thus the system configuration is optimized, the cost is reduced and the performance is enhanced.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127830977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A lately developed and designed S-band 2D shipborne radar with full coherence for air and surface targets is introduced. Advanced techniques in modern radar such as the amplification chain transmitter, the chirp compression, the MTD signal processor and the interpulse frequency agility etc. are employed and the full coherence of the radar signal is realized. Seagull radar has high performance, perfect functions, relatively high reliability and maintainability, and therefore meets the needs of large and medium scale surface warships.
{"title":"A new Seagull shipborne search radar","authors":"Meng Xianfu, Shao You-mei, Shi Zhaochang","doi":"10.1109/ICR.1996.573821","DOIUrl":"https://doi.org/10.1109/ICR.1996.573821","url":null,"abstract":"A lately developed and designed S-band 2D shipborne radar with full coherence for air and surface targets is introduced. Advanced techniques in modern radar such as the amplification chain transmitter, the chirp compression, the MTD signal processor and the interpulse frequency agility etc. are employed and the full coherence of the radar signal is realized. Seagull radar has high performance, perfect functions, relatively high reliability and maintainability, and therefore meets the needs of large and medium scale surface warships.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115089155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Farina, F. Gini, M. Greco, F. Lombardini, P. Lombardo, K.J. Sangston, L. Verrazzani
An overview on a number of new theoretical findings is presented for the optimum and suboptimum radar detection of fluctuating targets against a composite disturbance, which is modeled as a mixture of coherent K-distributed and Gaussian distributed disturbance. The optimum coherent detector, which derives from the likelihood ratio test, is used as the performance bound. Starting from some of its possible different analytical formulations, the optimum detector is approximated to give a family of suboptimum detectors, with performance close to optimal. The adaptive implementation of these detectors is discussed and the adaptivity loss is evaluated. The detection schemes are then fed with recorded live clutter data, and their performance are analyzed in such environment. The validity of the theoretical analysis is thus assessed as well as the practicality of the suboptimum detection schemes presented.
{"title":"Radar detection of targets: new theoretical findings and results by processing recorded live data","authors":"A. Farina, F. Gini, M. Greco, F. Lombardini, P. Lombardo, K.J. Sangston, L. Verrazzani","doi":"10.1109/ICR.1996.573761","DOIUrl":"https://doi.org/10.1109/ICR.1996.573761","url":null,"abstract":"An overview on a number of new theoretical findings is presented for the optimum and suboptimum radar detection of fluctuating targets against a composite disturbance, which is modeled as a mixture of coherent K-distributed and Gaussian distributed disturbance. The optimum coherent detector, which derives from the likelihood ratio test, is used as the performance bound. Starting from some of its possible different analytical formulations, the optimum detector is approximated to give a family of suboptimum detectors, with performance close to optimal. The adaptive implementation of these detectors is discussed and the adaptivity loss is evaluated. The detection schemes are then fed with recorded live clutter data, and their performance are analyzed in such environment. The validity of the theoretical analysis is thus assessed as well as the practicality of the suboptimum detection schemes presented.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114752028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Firstly, this article compares the properties of two fashionable frequency synthesizers: the phase-locked frequency synthesizer and the analogue direct frequency synthesizer. It analyses the main problems of the direct microwave frequency synthesizer and offers some solutions according to the actual radar conditions. Secondly, it proves the correctness of the theoretical analysis through examples. Lastly, it foresees the prospects of the application of the direct microwave frequency synthesizer.
{"title":"Prospects of the application of direct microwave frequency synthesizer to radar","authors":"Wang Lanxin","doi":"10.1109/ICR.1996.573803","DOIUrl":"https://doi.org/10.1109/ICR.1996.573803","url":null,"abstract":"Firstly, this article compares the properties of two fashionable frequency synthesizers: the phase-locked frequency synthesizer and the analogue direct frequency synthesizer. It analyses the main problems of the direct microwave frequency synthesizer and offers some solutions according to the actual radar conditions. Secondly, it proves the correctness of the theoretical analysis through examples. Lastly, it foresees the prospects of the application of the direct microwave frequency synthesizer.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117069469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The high range resolution performance of frequency stepped radar signal under the influence of thermal noise, target fluctuation, frequency jitter and target motion is analysed; the minimum target velocity unit needed to be compensated is calculated.
{"title":"High range resolution performance of frequency stepped radar signal","authors":"L. Teng, M. Erke, Han Yueqiu","doi":"10.1109/ICR.1996.573817","DOIUrl":"https://doi.org/10.1109/ICR.1996.573817","url":null,"abstract":"The high range resolution performance of frequency stepped radar signal under the influence of thermal noise, target fluctuation, frequency jitter and target motion is analysed; the minimum target velocity unit needed to be compensated is calculated.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116130983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Uncompensated phase errors presented in synthetic aperture radar (SAR) signals can have a disastrous effect on reconstructed image quality. We present a new method by which arbitrary phase errors can be corrected. The proposed technique is based on a continuous wavelet transform (CWT) analysis of the SAR signal. An approximate explicit expression for CWT is derived under the condition of the radar signal and the mother wavelet being constricted in asymptotic forms. It is demonstrated that the frequency modulation information, which can be used for refocusing the SAR image, can be obtained from the arguments or the moduli of the wavelet coefficients. Finally some simulation results are presented in order to validate the proposed technique.
{"title":"A new synthetic aperture radar autofocusing approach","authors":"Bai Ping, Chen Zongzhi","doi":"10.1109/ICR.1996.574453","DOIUrl":"https://doi.org/10.1109/ICR.1996.574453","url":null,"abstract":"Uncompensated phase errors presented in synthetic aperture radar (SAR) signals can have a disastrous effect on reconstructed image quality. We present a new method by which arbitrary phase errors can be corrected. The proposed technique is based on a continuous wavelet transform (CWT) analysis of the SAR signal. An approximate explicit expression for CWT is derived under the condition of the radar signal and the mother wavelet being constricted in asymptotic forms. It is demonstrated that the frequency modulation information, which can be used for refocusing the SAR image, can be obtained from the arguments or the moduli of the wavelet coefficients. Finally some simulation results are presented in order to validate the proposed technique.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115136999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents a processing technique to be applied to nadir looking radar sensors to gain altimetric data with high precision. Pulse limited altimeters are considered as those in use for the mapping of a surface. High resolution is obtained by means of phase monopulse in the cross-track direction while synthetic aperture processing followed by a proper incoherent technique is proposed for the resolution in the along-track direction.
{"title":"Determination of the average height of a large region from nadir looking radar sensors","authors":"G. Fedele, G. Picardi, R. Seu","doi":"10.1109/ICR.1996.573788","DOIUrl":"https://doi.org/10.1109/ICR.1996.573788","url":null,"abstract":"The paper presents a processing technique to be applied to nadir looking radar sensors to gain altimetric data with high precision. Pulse limited altimeters are considered as those in use for the mapping of a surface. High resolution is obtained by means of phase monopulse in the cross-track direction while synthetic aperture processing followed by a proper incoherent technique is proposed for the resolution in the along-track direction.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123690536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The performance analysis of the MUSIC algorithm in the presence of channel frequency property mismatch is given. Theoretical relationships between the spatial spectrum and channel mismatch, and that between the resolution ability and channel mismatch are derived. The results show that the channel mismatch seriously degrades the MUSIC algorithm. The formulas were validated by computer simulation.
{"title":"The effect of channel mismatch on the spatial spectrum and resolution ability of MUSIC algorithm","authors":"S. Weimin, Ni Jin-lin, Liu Guo-sui, Zhang Guangyi","doi":"10.1109/ICR.1996.573781","DOIUrl":"https://doi.org/10.1109/ICR.1996.573781","url":null,"abstract":"The performance analysis of the MUSIC algorithm in the presence of channel frequency property mismatch is given. Theoretical relationships between the spatial spectrum and channel mismatch, and that between the resolution ability and channel mismatch are derived. The results show that the channel mismatch seriously degrades the MUSIC algorithm. The formulas were validated by computer simulation.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122034570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thinned stepped frequency waveforms were introduced in the past for the purpose of furnishing existing radar with a high range resolution capability, acceptable for imaging. This paper discusses the practical problems of calibrating and cohering the radar returns and, in particular, the application of the various adaptive beamforming algorithms for the special case of thinned stepped frequency waveforms.
{"title":"Adaptive beamforming of thinned stepped frequency waveforms applied to imaging","authors":"A. Freedman, B. Steinberg, R. Bose","doi":"10.1109/ICR.1996.574462","DOIUrl":"https://doi.org/10.1109/ICR.1996.574462","url":null,"abstract":"Thinned stepped frequency waveforms were introduced in the past for the purpose of furnishing existing radar with a high range resolution capability, acceptable for imaging. This paper discusses the practical problems of calibrating and cohering the radar returns and, in particular, the application of the various adaptive beamforming algorithms for the special case of thinned stepped frequency waveforms.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":" 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113951854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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