一种基于滤波响应损失的多通道合成孔径雷达地面动目标检测方法

针对在非均匀杂波背景下,杂波抑制后孤立强杂波剩余能量导致动目标检测虚警率升高的问题,提出了一种基于滤波响应损失的多通道合成孔径雷达地面动目标检测(SAR-GMTI)方法。对多通道的合成孔径雷达(SAR)图像进行维纳匹配滤波处理,在杂波抑制残差图检测的基础上,根据滤波前后信号的能量差异设计了滤波响应损失检测量,对潜在目标进行二次检测,以剔除虚警。仿真与机载实测数据表明:该方法能在非均匀杂波背景下有效改善动目标的检测性能,可应用于运动平台雷达对地监视预警。

Multi-Channel SAR-GMTI Method Based on Filtering Response Loss in Heterogeneous Clutter Background

For ground moving target identification (GMTI) in heterogeneous clutter background, due to the isolated strong clutter residua after adaptive clutter rejection, most detectors based on the signal magnitude may detect many false alarms. In this paper, a multi-channel synthetic aperture radar (SAR) GMTI method based on the filtering response loss is proposed. For multi-channel SAR images, the Wiener filtering is first applied to suppress the clutter. Then, based on the magnitude-based detection, a filtering response loss test is designed to further remove false alarms according to the energy difference in the process of clutter rejection. The simulation results and airborne measured data validate the detection performance improvement of the proposed method in heterogeneous clutter background. The proposed method can be applied to airborne or space-based radar surveillance in the ground background.