解运动目标径向速度模糊的多通道干涉SAR/GMTI方法

A Multi-channel Interferometric SAR/GMTI Method for Solving Radial Velocity Ambiguity of Moving Target

针对常规的合成孔径雷达/地面运动目标检测(SAR/GMTI)系统目标径向速度过大导致的速度模糊问题,提出了一种解径向速度模糊的多通道干涉SAR运动目标检测方法。该方法通过设置4个不等间隔的接收通道并合理设计各通道间距,对两两子图像分别进行干涉对消处理,得到2个测速集合,这2个集合的交集元素即为目标速度的正确估计,从而有效解决速度模糊问题,实现对目标径向速度的精确估计。理论分析及计算机仿真验证了该方法的有效性。

In the conventional Synthetic Aperture Radar and Ground Moving Target Indication(SAR/GMTI) system,the excessively high azimuth velocity may cause velocity ambiguity.To solve the problem of radial velocity ambiguity of moving target,a kind of multi-channel interferometric of SAR/GMTI scheme is presented.By setting up four receiving channels with non-uniform intervals and designing each channel spacing reasonably,the method carries out interferometric cancellation respectively on the sub-images of two echo signals.Then,two velocity sets are obtained,and the intersection of the two sets is the correct estimation of the target velocity.Therefore,the problem of velocity ambiguity is solved and the radial velocity of the target is estimated correctly.The validity of the method has been demonstrated by analysis and computer simulation.