机载广域监视SAR地面运动目标检测和参数估计方法

摘要

A method of moving target detection, localization and velocity estimation used for Wide Area Surveillance (WAS) radar system is proposed in this paper. Firstly, based on the geometry of wide area surveillance SAR, the image signatures of moving target is derived, which shows that it will shift not only in azimuth direction but in range direction. Then, it presents the ways of clutter suppression and moving target detection based on sub-aperture. Finally, an approach of parameter estimation is pro-posed for WAS SAR mode, and the trajectory of moving target is formed in this mode. Computer simulation results validate the effectiveness of the method proposed in this paper.%提出了一种机载广域监视SAR地面运动目标检测和参数估计方法。首先，基于斜视SAR的空间几何模型推导了地面运动目标成像的特征，得出运动目标不仅在方位向发生偏移，而且在距离向也会产生位移；然后，利用子孔径方法实现杂波抑制和运动目标的检测；最后，提出了广域监视SAR模式下运动目标的参数估计方法，并得到了该模式下运动目标的成像轨迹。计算机仿真验证了本文提出的机载广域监视SAR系统可以实现运动目标的检测和目标运动轨迹的形成。