一种舰载雷达海杂波抑制方法
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摘要
舰载雷达在探测海面目标时由于强海杂波环境的影响,降低了雷达对海面目标的检测和定位跟踪性能。为了有效抑制海杂波、凸显有用目标,文中对海杂波的概率密度分布、时间相关性和频率相关性等特性进行了分析,并提出了雷达系统设计、自适应CFAR、扫描圈间积累和频率捷变等几种抑制海杂波的方法。实录雷达数据处理结果表明,文中的方法能显著提高舰载雷达的海面目标检测能力。
The detection for maritime targets in strong sea clutter is difficult for ship-borne radar. The sea clutter would significantly reduce the capability of radars in detecting and locating targets on the ocean surface. To suppress sea clutter effectively and distinguish useful targets, the probability density distribution, time correlation, frequency correlation of sea clutter are analyzed. Several methods are presented, such as radar system design, self-adapting CFAR, scan-to-scan accumulation and frequency agility. The result of processing real data shows that the proposed methods greatly improve the detection capability of ship-borne radar for maritime targets.
The detection for maritime targets in strong sea clutter is difficult for ship-borne radar. The sea clutter would significantly reduce the capability of radars in detecting and locating targets on the ocean surface. To suppress sea clutter effectively and distinguish useful targets, the probability density distribution, time correlation, frequency correlation of sea clutter are analyzed. Several methods are presented, such as radar system design, self-adapting CFAR, scan-to-scan accumulation and frequency agility. The result of processing real data shows that the proposed methods greatly improve the detection capability of ship-borne radar for maritime targets.
引文
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[12]吕江涛,肖靖,徐振来.相控阵雷达对海面目标的检测跟踪方法[J].现代雷达,2008,30(4):50-52.LU Jiangtao,XIAO Jing,XU Zhenlai.Detection and tracking method for sea targets in phased array radar[J].Modern Radar,2008,30(4):50-52.
[13]宋全祥.频率捷变雷达抗窄带杂波干扰和抑制海浪杂波的能力[J].现代雷达,1995,17(6):1-6.SONG Quanxiang.Ability of frequency agility radar to resist narrow-band clutter jamming and to reject sea wave clutter[J].Modern Radar,1995,17(6):1-6.
[2]RICHARDS M A.雷达信号处理基础[M].邢孟道,王彤,李真芳,等译.北京:电子工业出版社,2008.RICHARDS M A.Fundamentals of radar signal processing[M].XING Mengdao,WANG Tong,LI Zhenfang,el al Translate.Beijing:Publishing House of Electronics Industry,2008.
[3]吴三元,邱新军,马来群.海面RCS与雷达海上目标检测[J].火控雷达技术,2008(6):51-53.WU Sanyuan,QIU Xinjun,MA Laiqun.Sea surface RCS and radar maritime targets detection[J].Fire Control Radar Technology,2008(6):51-53.
[4]CHAN H C.Radar sea-clutter at low grazing angles[J].IEE Proceedings of Radar Sonar Navigation,1990,137(2):102-112.
[5]FAY F A,CLARKE J,PETERS R S.Weibull distribution applied to sea-clutter[C]//Proceedings of the IEE Conference of Radar.London:IEEE Press,1977:101-103.
[6]WARD K D,BAKER C J,WATTS S.Maritime surveillance radar I:radar scattering from the ocean surface[J].IEE Pro-ceedings of Radar Signal Process,1990,137(2):51-62.
[7]NOHARA T,HAYKIN S.Canadian east coast radar trials and the k-distribution[J].IEE Proceedings of Radar Signal Processing,1991(138):80-88.
[8]PANA G L,SORAGHAN J J.Small target detection in sea clutter[J].IEEE Transactions on Geoscience and Remote Sensing.2004,42(7):1355-1361.
[9]CRONEY J.Improved visibility of small targets in sea clutter[J].The Radio and Electronic Engineer,1966(32):135-148.
[10]RAVID R,LEVANON N.Maximum-likelihood CFAR for Weibull background[J].IEE Proceedings of Radar and Signal Processing,1992,139(3):256-264.
[11]GUIDA M,LONGO M,LOPS M.Biparametric CFAR procedures for log-normal clutter[J].IEEE Transactions on Aerospace&Electronic Systems,1993,29(3):798-809.
[12]吕江涛,肖靖,徐振来.相控阵雷达对海面目标的检测跟踪方法[J].现代雷达,2008,30(4):50-52.LU Jiangtao,XIAO Jing,XU Zhenlai.Detection and tracking method for sea targets in phased array radar[J].Modern Radar,2008,30(4):50-52.
[13]宋全祥.频率捷变雷达抗窄带杂波干扰和抑制海浪杂波的能力[J].现代雷达,1995,17(6):1-6.SONG Quanxiang.Ability of frequency agility radar to resist narrow-band clutter jamming and to reject sea wave clutter[J].Modern Radar,1995,17(6):1-6.