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时间:2020-06-03
《极化-空域联合抗机载雷达欺骗式主瓣干扰.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第7期电子与信息学报Vl01.36NO.72014年7月JournalofElectronics&InformationTechnologyJu1.2014极化一空域联合抗机载雷达欺骗式主瓣干扰文才王彤吴亿锋吴建新f西安电子科技大学雷达信号处理国防科技重点实验室西安710071)摘要:机载雷达欺骗式主瓣干扰不仅会引起大量虚警,还会污染空时自适应处理(STAP)器的训练样本,引起自适应方向图畸变,导致期望信号相消和杂波抑制性能下降。针对此问题,利用目标信号与干扰信号极化特性的差异,该文提出一种极化.空域联合自适应波束形成的方法来抑制欺骗式主瓣干扰。该方法
2、首先在多普勒清晰区挑选干扰样本,并采用特征融合技术估计干扰协方差矩阵,然后采用重叠滑窗的子阵合成方式进行极化一空域联合自适应波束形成,在抑制主瓣干扰的同时为后续杂波抑制保留了空域自由度,最后通过STAP抑制剩余的杂波。该算法可以有效滤除密集欺骗式干扰,减少由其引起的虚警,改善机载STAP雷达的杂波抑制性能。仿真结果验证了该方法的有效性。关键词:机载雷达;密集转发式干扰;极化一空域自适应波束形成;空时自适应处理中图分类号:TN959.73文献标识码:A文章编号:1009.5896(2014)07—1552—08DOI:10.3724/SP.J.1146.2013
3、.01739DeceptiveMainlobeJammingSuppressionforAirborneRadarBasedonJointProcessinginPolarizationalandSpatialDomainsWenCaiWangTongWuYi—-fengWuJian--xin(NationalKeyLaboratoryofScienceandTechnologyonRadarSignalProcessing,XidianUniversity,Xi’an710071,China)Abstract:Thedeceptivemalnlobejamm
4、ingofairborneradarnotonlycausesalargeamountoffalsealarmsbutalsocontaminatessamplesoftheSpace—TimeAdaptiveProcessor(STAP).Hence,theperformanceoncluttersuppressionisdegradedandsignalself-cancellationoccursduetothedistortedadaptivepattern.Apolarization-spaceadaptivebeamformingalgorithm
5、utilizingthepolarizationdifferencebetweenthetargetsignalandjammingisproposedforsuppressingthedeceptivemalnlobejamming.Firstly,theeigen—fusionbasedjammingcovariancematrixisestimatedbythesamplesobtainedfromclutter—freeDopplerzone.Then,thepolarization—spaceadaptivebeamformingalgorithmi
6、scarriedoutviasynthesizingsubarrayswithoverlappedwindow.Thisalgorithmhastheabilitytosuppressmainlobejammingandretainthespatialdegreeoffreedomforcluttersuppression.Finally,theSTAPisutilizedtosuppresstheresidualclutter.Theproposedmethodcaneficientlysuppressthedensedeceptivejamming,and
7、hence,reducethenumberoffalsealarms.TheperformanceofSTAPforcluttersuppressioncanalsobeimproved.Simulationresultsverifytheefectivenessoftheproposedmethod.Keywords:Airborneradar;Densedeceptionjamming;Polarization-spaceadaptivebeamforming;Space—TimeAdaptiveProcessing(STAP)1引言欺骗干扰甚至会使雷达跟
8、踪数据处理器饱和而无法正常工作。空时自
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