一种基于双通道DPCA的SAR-GMTI杂波抑制方法  

A Clutter Suppression Approach for SAR-GMTI Based on Dual-channel DPCA

作　　者：王肖洋 高贵[1] 周石琳[1] 邹焕新[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073

出　　处：《雷达学报（中英文）》2014年第2期241-248,共8页Journal of Radars

基　　金：国家自然科学基金(41171316)资助课题

摘　　要：偏置相位中心天线技术(DPCA)作为空时自适应信号处理(STAP)技术的特殊形式,在合成孔径雷达地面动目标指示(SAR-GMTI)领域得到了广泛的应用。杂波抑制的能力直接决定了GMTI的性能,传统的复图像域DPCA技术对于地杂波抑制能力有限,特别是广泛分布着强散射静止地物的城市区域。该文利用干涉相位对DPCA幅度进行非线性加权,提出了一种加权DPCA杂波抑制方法,该方法降低了通道间残差相位对DPCA杂波抑制的影响。实验结果表明:该文方法在杂波抑制能力上优于传统DPCA方法。The Displaced Phase Center Antenna （DPCA） technology, a particular form of Space Time Adaptive Processing （STAP）, has been widely used in Synthetic Aperture Radar Ground Moving Target Indication （SAR-GMTI）. The GMTI performance depends on the capability of clutter rejection but the traditional DPCA technology operated in the complex image domain does not have the appropriate clutter rejection capability for urban areas with strong scattering stationary objects. Hence, interferometry phase is used to weight the DPCA magnitude nonlinearly, and a weighted DPCA clutter rejection approach is proposed, which reduces the interference from residual phase difference. The experimental results suggest that the new approach can improve the clutter rejection compared with the conventional DPCA.

关 键 词：空时自适应信号处理(STAP) 偏置相位中心天线(DPCA) 合成孔径雷达(SAR) 地面动目标检测(GMTI) 杂波抑制 

分 类 号：TN958[电子电信—信号与信息处理]