一种基于Deramp处理的空时自适应处理方法  

A Space-time Adaptive Processing Method Based on Deramp Processing

作　　者：李学仕[1] 孙光才[1] 邵鹏[1] 吴玉峰[1] 邢孟道[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2014年第11期2659-2665,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金优秀青年基金(61222108);国家自然科学青年基金(61301292;61101245);中央高校基本科研业务费专项(K5051302058;K5051302046)资助课题

摘　　要：在多通道合成孔径雷达动目标检测(SAR-GMTI)系统中,直接利用传统的后多普勒空时自适应处理(PD-STAP)技术进行杂波抑制会导致3个问题。第一,由于动目标径向速度引起的多普勒偏移会导致动目标出现谱卷绕,直接利用匹配滤波的方法对动目标聚焦会出现虚假目标。第二,在信号下采样的情况下,动目标聚焦位置会出现脉冲重复频率(PRF)的偏差,从而导致一个动目标可能出现在多个位置,使得动目标检测变得复杂。第三,利用传统的PD-STAP技术进行杂波抑制会导致很大的计算复杂性。基于此,该文提出一种基于Deramp处理的空时自适应处理方法进行杂波抑制处理,可以有效解决上述问题。该文最后通过仿真实验验证了该方法的有效性。In multichannel Synthetic Aperture Radar-Ground Moving Targets Indication （SAR-GMTI） systems, three problems are led by utilizing the conventional Post Doppler-Space-Time Adaptive Processing （PD-STAP） technique. Firstly, the target Doppler spectrum is wrapped because of the Doppler shift caused by the cross-track velocity of the moving target. The ambiguities are appeared if directly using the matched filtering. Secondly, in the case of the signal undersampling, a Pulse Repeating Frequency （PRF） shifting is caused in the azimuth direction for a moving target in the focused image. This makes the moving target detection much more complicated and challenging. Thirdly, the traditional PD-STAP technique also has a high computational complexity. To overcome these problems, a novel space-time adaptive processing method based on Deramp processing is proposed. Simulation results validate the effectiveness of the proposed algorithm.

关 键 词：合成孔径雷达 Deramp处理 后多普勒空时自适应处理(PD-STAP) 动目标检测 动目标成像 

分 类 号：TN957.51[电子电信—信号与信息处理]