分布式SAR系统中运动目标检测定位技术

GMTI and Location Based on Improved ESPRIT in Distributed Satellite SAR

摘要: 建立了分布式卫星SAR系统动目标检测定位和测速模型,提出了一种基于改进的ESPRIT算法的多通道动目标检测定位和测速方法。该方法用DPCA技术检测动目标,再利用改进的ESPRIT算法确定动目标数并定位,提取运动参数。理论和仿真结果表明该方法能正确检测动目标并确定运动参数,与传统FFT方法比较,尤其对于成像后在一个方位分辨单元内的多个动目标情况,该方法具有明显优越性。

Abstract: The model of detection, location and measuring velocity of the moving targets is constructed under the condition of distributed satellite SAR. A new multi-channel GMTI algorithm based on improved ESPRIT is proposed. At first, DPCA is employed to detect the moving targets. Then ESPRIT is used to precisely estimate their number and calculate the position and velocity. The theoretical analysis and simulation results show the new algorithm is effective and can not only detect the moving targets but also estimate their motion parameters precisely.