长相关积累STAP处理的星载SAR-GMTI  

Spaceborne SAR-GMTI with Long CPI Multi-channel STAP

作　　者：杨凤凤[1] 王敏[1] 梁甸农[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《现代雷达》2008年第2期71-75,共5页Modern Radar

摘　　要：目前多通道STAP多应用在短相干脉冲积累(CPI)模式的非成像体制雷达地杂波抑制,而对长CPI的SAR成像体制下的讨论较少。文中首先分析两种体制下STAP采用的不同信号模型,研究CPI对回波统计特性的影响和两种体制目标功率谱的差异。然后讨论SAR成像体制下STAP的应用,分析空时去相干性的影响。指出星载非平稳杂波环境中长CPI多普勒后处理的优势:既能有效降低杂波秩,减小样本支持数,同时减弱对空时去相关源的敏感性,又可得到动目标SAR图像。最后给出仿真实例。Multi-channel STAP for short coherent pulses integrated(CPI) non-imaging radar system′s clutter suppression was discussed widely,and for SAR imaging radar system deficiently.The difference of the signal models for two systems was analyzed firstly,and the effects of CPI on clutter statistical character and power spectrum were discovered.Then the STAP processing in Doppler domain for SAR was discussed,and the decorrelation sources′ effects on the processing were analyzed.The post-Doppler processing decreased ...

关 键 词：空时自适应处理 多通道SAR 地面动目标检测 相干积累 杂波秩 

分 类 号：TN958[电子电信—信号与信息处理]