一种非均匀环境下多通道SAR动目标检测算法

Algorithm of Multichannel SAR Moving Target Detection in Nonhomogeneous Environment

针对非均匀环境中SAR-GMTI动目标检测性能下降的问题,提出了一种新的动目标检测算法。该算法首先通过广义内积(GIP)来修正杂波的协方差矩阵,从而达到抑制均匀杂波的目的,然后利用恒虚警(CFAR)检测技术提取动目标及强干扰目标,最后根据杂波抑制剩余信号的多普勒中心来剔除强干扰目标。理论分析及实验结果表明,该方法不仅能够很好地抑制均匀杂波,且能剔除强干扰目标,适用于强干扰存在的非均匀环境。

This paper proposes a new moving target detection algorithm to deal with the performance loss in moving target detection under non-homogeneous environment in SAR-GMTI systems. The algorithm firstly fixes the clutter covariance matrix by generalized inner product（ GIP） to deliberately suppress homogeneous clutter,and then extracts the moving target detection and strong interference target through the constant false alarm（ CFAR）. Finally,it eliminates the strong interference target according to the Doppler center of the suppressing clutter residual signal. Theoretical analysis and experimental results show that the proposed method can not only effectively suppress homogeneous clutter,but also eliminate interference target,applicable to the non-homogeneous environment with strong interference.