A Moving Target Velocity Estimation Method Based on the MC-MASA SAR Mode

Remote Sensing

Wei Liu¹  Wei Yang²  Chunsheng Li²  Jie Chen²  Yamin Wang² 

[1] Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK;School of Electronic and Information Engineering, Beihang University, Beijing 100191, China;

关键词: multi-channels and multiple azimuth squint angles (MC-MASA);    synthetic aperture radar (SAR);    velocity estimation;    DPCA;    ATI;   

DOI  :  10.3390/rs13091632

来源: DOAJ

【 摘 要 】

Imaging position shift based on the multiple azimuth squint angles (MASA) mode is effective for target azimuth velocity estimation, whereas accuracy is low when target range velocity is high. In this paper, the estimation problem for both target azimuth and range velocities is considered based on the multi-channels MASA (MC-MASA) mode. Firstly, the acquisition geometry of MC-MASA mode and Doppler characteristics of a moving target are analyzed in detail, especially in squint mode. Then, for better moving target estimation, the stationary background clutter is removed using the displacement phase center antenna (DPCA) technique, and the failure in range velocity estimation with sequential SAR images is also discussed. Furthermore, a modified along-track interferometry (ATI) is proposed to preliminarily reconstruct the azimuth-and-range velocity map based on the MC-MASA mode. Since the velocity estimation accuracy is dependent on squint angle and signal-to-clutter ratio (SCR), the circumstances are divided into three cases with different iteration estimation strategies, which could expand the scene application scope of velocity estimation and achieve a high estimation accuracy along both azimuth and range directions. Finally, the performance of the proposed method is demonstrated by experimental results.

【 授权许可】

Unknown