基于和差测角的多通道SAR动目标指示方法

A Novel Moving Target Indication Approach in Multi-channel SAR System Based on 2-D Angle Estimation

针对合成孔径雷达系统中运动目标由于速度的存在使其能量无法累积会造成目标散焦的问题,结合和差测角技术提出了一种杂波环境下的四通道合成孔径雷达运动目标指示方法。首先,利用空时自适应杂波抑制技术去除杂波的影响。然后,由于运动目标的非合作性,杂波抑制完成后得到的运动目标信号的能量分散于不同的距离或者方位单元内,利用二维和差测角技术来估计动目标的方位角和俯仰角,结合聚类技术将目标能量集中绘制到对应的分辨率网格中,完成回波内的运动目标能量累积,为动目标指示技术提供一种新的思路。最后,通过两组仿真实验结果验证本文所提出的动目标指示方法的有效性。

In SAR systems,it is necessary to consider that the energy of moving target in clutter cannot be accumulated caused by the velocity,which will lead to defocusing.For this issue,a novel four-channel SAR moving target indication approach under clutter is proposed by combining the sum-difference 2D angle estimation in this paper.Firstly,the sum-difference space-time adaptive clutter suppression technique is utilized to suppress the clutter.However,due to the non-cooperative of moving targets,the energy is dispersed among different bins.Therefore,this paper employs a 2D sum-difference angle measurement to gain estimation of 2D angle.At the same time,combines clustering techniques to concentrate the energy of moving target onto the corresponding resolution grid.Hence,according to the estimation of 2D angle,the energy accumulation is completed,which provides a new idea for moving target indication.Finally,some experiments are implemented to validate the proposed target detection approach.