空中运动目标检测方法

Study on Detection of Air Moving Targets

提出了一种基于星载SAR系统的空中运动目标检测方法。首先利用双通道DPCA技术实现对地面杂波的抑制,然后通过相邻相关法对运动目标进行检测。相邻相关处理能够起到对动目标回波信号进行降阶的作用,后利用改进的keystone变换实现动目标的走动校正,并沿方位相干积累能够实现在低信噪比情况下检测运动目标。同时由于经过相邻相关处理后动目标在二维平面中表现为一个尖峰,这使得后续采用传统的CFAR检测方法非常有利。最后通过仿真实验验证了所提方法的有效性。

Air moving targets detection method based on the spaceborne SAR system is proposed in this paper. First,the background clutter can be suppressed by using the DPCA technique.Then,the moving target detection can be performed by the adjacent correlation processing. As a result of this step,the envelope migration correction can be implemented and makes use of modified keystone transform to eliminate the effect of range walk. And it is beneficial to moving target detection by using the traditional CFAR test since the moving target is a single point in the two dimensional plane. Finally,the effectiveness of the proposed algorithm is validated with the simulation results.