一种干扰环境下的机载SAR慢动目标检测方法

A Method of Airborne SAR Slow-Moving Targets Detecting under Jamming Conditions

在电磁干扰的环境下,经典的合成孔径雷达(SAR)的成像和地面动目标检测算法的性能将会变差甚至失效,因此研究存在干扰时的高效可行的SAR动目标检测方法具有重要的实际意义。提出一种将自适应波束形成技术和杂波抑制干涉(CSI)技术相结合的阵列天线动目标检测方法。该方法首先采用自适应波束形成技术消除干扰,然后用CSI方法抑制地杂波并实现运动目标的检测。同时,采用不等间距偏置相位中心天线(DPCA)技术,消除了盲速区。从SAR天线结构和空间几何模型入手,详细分析了干扰抑制原理、杂波抑制和动目标检测原理并给出了其实现框图。最后通过计算机仿真,验证了该方法的可行性。

The imaging and moving targets detection capability of a Synthetic Aperture Radar （SAR） could be seriously limited or＇denied by an electromagnetic interference, so it is necessary to research on ground moving targets detection methods under jamming conditions. In this paper a method of detecting slow-moving ground targets using array antenna based on adaptive beamforming and Clutter Suppression Interferometry （CSI） is presented. It uses adaptive beamforming technique firstly to anti-jamming and uses CSI technique to suppress ground clutter and detect moving targets. Moreover, it uses Non-uniform displaced phase center antenna （DPCA） to eliminate the blind-speed regions. This paper analyze the theory of anti-jamming, suppressing clutter and moving target detection in detail based on SAR antenna structure and spatial geometry model of the system, then the realization steps were presented. Finally, computer simulation results validate its feasibility.