The Trajectory Reconstruction of Moving Target Based on Road Line in Multichannel WasSAR-GMTI

Multichannel wide-angle staring synthetic aperture radar ground moving target indication (WasSAR-GMTI) has attracted a lot of interest for its ability of moving target detection and trajectory reconstruction. However, the parameter estimation of moving target is easily affected by clutter and noise, which deteriorates the performance of the following geolocation. In this article, a novel approach for trajectory reconstruction of moving target based on road line is proposed. First, after performing multichannel calibration, a novel Doppler centroid estimation and correction method is proposed. This method is not dependent on attitude information of platform nor does it require scene uniformity as a prior condition, which has high robustness in complex environments. Then, the weighted adaptive matched filtering (WAMF) and the modified Gaussian mixture probability hypothesis density (GMPHD) are performed for velocity estimation and tracking. Finally, the error items affecting geolocation accuracy were analyzed in detail. Also, a novel two-step geolocation method based on road lines is proposed to correct geolocation errors, which can be applied in complex road networks. The proposed method only needs 1-D parameter searching, which has high efficiency. The real-measured WasSAR data processing results demonstrated the effectiveness and practicability of the proposed algorithm.