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 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}
The computational complexity of robust adaptive array with quadratic constraints is a critical problem in real time implementation. For coping with this problem, the Chua's (1988) nonlinear programming recurrent neural network is explored, which is used to solve the optimal solution of the robust adaptive array with quadratic constraints. The present approach converges within several times of the circuit time constant, thus particularly suitable to real time applications.
{"title":"A neural implementation of robust broadband adaptive array","authors":"G. Qiang","doi":"10.1109/ICR.1996.574465","DOIUrl":"https://doi.org/10.1109/ICR.1996.574465","url":null,"abstract":"The computational complexity of robust adaptive array with quadratic constraints is a critical problem in real time implementation. For coping with this problem, the Chua's (1988) nonlinear programming recurrent neural network is explored, which is used to solve the optimal solution of the robust adaptive array with quadratic constraints. The present approach converges within several times of the circuit time constant, thus particularly suitable to real time applications.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"6 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":"123975103","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}
This paper presents a signal processing method to remove the velocity vagueness and probability ambiguity of the random binary phase coded pulse signal (RBPC-PS) radar. From all the results analysed and discussed, we can conclude that because of the excellent specific property of the random signal and by adopting a reasonable signal processing scheme, the RBPC-PS radar system possesses a good resolution and accuracy in measuring the distance and the velocity of the target and good jamming immunity, and it can remove the distance and velocity vagueness caused by periods and extend the Doppler tolerance. From the results we can also see that the statistical method of the range sidelobe (RSL) suppression can reduce the RSL by over 30 dB thus avoiding the probability ambiguity, which makes the RBPC-PS radar system practical.
{"title":"The velocity vagueness and probability ambiguity remove of the random binary phase coded pulse signal radar","authors":"Sun Guangmin, Liu Guo-sui, G. Hong, Z. Xiaohua","doi":"10.1109/ICR.1996.574539","DOIUrl":"https://doi.org/10.1109/ICR.1996.574539","url":null,"abstract":"This paper presents a signal processing method to remove the velocity vagueness and probability ambiguity of the random binary phase coded pulse signal (RBPC-PS) radar. From all the results analysed and discussed, we can conclude that because of the excellent specific property of the random signal and by adopting a reasonable signal processing scheme, the RBPC-PS radar system possesses a good resolution and accuracy in measuring the distance and the velocity of the target and good jamming immunity, and it can remove the distance and velocity vagueness caused by periods and extend the Doppler tolerance. From the results we can also see that the statistical method of the range sidelobe (RSL) suppression can reduce the RSL by over 30 dB thus avoiding the probability ambiguity, which makes the RBPC-PS radar system practical.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"132 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":"123813402","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 novel approach to radar netting is presented. Based on the measured radar cross section (RCS) of interested targets and the coverage diagrams of the different radar in a radar network, the approach can be used to solve the problem of how optimally to locate the radar to achieve a satisfactory surveillance area and some highly concerned areas (i.e., core areas) inside. Several factors have been taken into account in this approach, such as local terrain around the radar, man-made interference, flying direction of target, etc. Simple examples are discussed for illustration. The radar netting optimization is of great importance in the networking technologies, since it is related directly to the optimal distribution of the detection and tracking performance in the surveillance area, and determines where data fusion may become feasible and where it is imperative.
{"title":"An approach to radar netting","authors":"Que Weiyan, Peng Ying-ning, Lu Dajin, Hou Xiuying","doi":"10.1109/ICR.1996.574538","DOIUrl":"https://doi.org/10.1109/ICR.1996.574538","url":null,"abstract":"A novel approach to radar netting is presented. Based on the measured radar cross section (RCS) of interested targets and the coverage diagrams of the different radar in a radar network, the approach can be used to solve the problem of how optimally to locate the radar to achieve a satisfactory surveillance area and some highly concerned areas (i.e., core areas) inside. Several factors have been taken into account in this approach, such as local terrain around the radar, man-made interference, flying direction of target, etc. Simple examples are discussed for illustration. The radar netting optimization is of great importance in the networking technologies, since it is related directly to the optimal distribution of the detection and tracking performance in the surveillance area, and determines where data fusion may become feasible and where it is imperative.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"11 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":"128208444","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}
In step frequency radar, the frequency of each pulse is increased in steps to achieve large effective bandwidth sequentially instead of instantaneously and thus easing the requirements on the analog to digital converter (ADC) and other hardware. This paper discusses the step frequency radar and its associated signal processing, and it investigates this type of radar with the ambiguity function. The mathematical expression is derived for the ambiguity function of step frequency radar receiver and processor. The processor functions included are range gating, weighting, fill pulses, and inverse discrete Fourier transform (IDFT). Ambiguity diagrams are plotted for step frequency receiver processor and comparison is made with traditional constant frequency radar.
{"title":"The ambiguity function of the step frequency radar signal processor","authors":"G. Gill, Jen-Chih Huang","doi":"10.1109/ICR.1996.574466","DOIUrl":"https://doi.org/10.1109/ICR.1996.574466","url":null,"abstract":"In step frequency radar, the frequency of each pulse is increased in steps to achieve large effective bandwidth sequentially instead of instantaneously and thus easing the requirements on the analog to digital converter (ADC) and other hardware. This paper discusses the step frequency radar and its associated signal processing, and it investigates this type of radar with the ambiguity function. The mathematical expression is derived for the ambiguity function of step frequency radar receiver and processor. The processor functions included are range gating, weighting, fill pulses, and inverse discrete Fourier transform (IDFT). Ambiguity diagrams are plotted for step frequency receiver processor and comparison is made with traditional constant frequency radar.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"1 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":"128869103","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}
Some probabilistic data association methods, which have been published in recent years, are equivalent to appropriate networks in the paper. According to the property and the feature of JPDA network structure, a fast, compact and effective data association is presented. The data association performance of the new comparing with other probabilistic data association methods. Making use of the new method and a new adapative Kalman filter presented by Zhu Ziqian (1992), a MTT system is developed and is simulated with several groups typical multitarget motion trajectory in an airborne radar MTT system.
{"title":"Iterated joint probabilistic data association","authors":"Zhu Ziqian","doi":"10.1109/ICR.1996.574488","DOIUrl":"https://doi.org/10.1109/ICR.1996.574488","url":null,"abstract":"Some probabilistic data association methods, which have been published in recent years, are equivalent to appropriate networks in the paper. According to the property and the feature of JPDA network structure, a fast, compact and effective data association is presented. The data association performance of the new comparing with other probabilistic data association methods. Making use of the new method and a new adapative Kalman filter presented by Zhu Ziqian (1992), a MTT system is developed and is simulated with several groups typical multitarget motion trajectory in an airborne radar MTT system.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"40 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":"129441221","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}
This paper introduces the harbour surveillance radar HSR-1128 developed by Nanjing Research Institute of Electronics Technology. The radar has been operating in Tanggu Harbour VTS Center in Tianjin for more than one year. This X-band radar utilizes frequency diversity, polarization diversity and time diversity to significantly suppress sea clutter, rain or snow clutter and radar interference. The system performance and operating principles of this radar are described; the advanced techniques it uses and the operating status are also stated.
{"title":"A new type of harbour surveillance radar with diversity processing","authors":"Yang Hanmin, Wu Mingmin","doi":"10.1109/ICR.1996.574552","DOIUrl":"https://doi.org/10.1109/ICR.1996.574552","url":null,"abstract":"This paper introduces the harbour surveillance radar HSR-1128 developed by Nanjing Research Institute of Electronics Technology. The radar has been operating in Tanggu Harbour VTS Center in Tianjin for more than one year. This X-band radar utilizes frequency diversity, polarization diversity and time diversity to significantly suppress sea clutter, rain or snow clutter and radar interference. The system performance and operating principles of this radar are described; the advanced techniques it uses and the operating status are also stated.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"11 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":"122757209","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}
For pt.I see ibid., p.755, 1996. The considerations on space-time adaptive processing for clutter rejection in air- and spaceborne radar presented in pt.I of this paper are continued. While in part I space-time processing algorithms were presented which are capable of adaptive real-time processing in this paper some consideration on frequency domain processing are made. Two new variants of the well-known space-time processors described in pt.I are presented. All processors presented in the two twin papers are compared in terms of computational complexity which is equivalent to the real-time processing capability. It is shown that frequency domain processing may yield some advantage over space-time processing.
{"title":"Real-time adaptive airborne MTI. II. Space-frequency processing","authors":"R. Klemm","doi":"10.1109/ICR.1996.574487","DOIUrl":"https://doi.org/10.1109/ICR.1996.574487","url":null,"abstract":"For pt.I see ibid., p.755, 1996. The considerations on space-time adaptive processing for clutter rejection in air- and spaceborne radar presented in pt.I of this paper are continued. While in part I space-time processing algorithms were presented which are capable of adaptive real-time processing in this paper some consideration on frequency domain processing are made. Two new variants of the well-known space-time processors described in pt.I are presented. All processors presented in the two twin papers are compared in terms of computational complexity which is equivalent to the real-time processing capability. It is shown that frequency domain processing may yield some advantage over space-time processing.","PeriodicalId":144063,"journal":{"name":"Proceedings of International Radar Conference","volume":"12 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":"127739813","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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