SAR/GMTI方法的改进与动目标在雷达图像上的再定位处理

SAR雷达是一种高分辨成像雷达,GMTI是SAR的一种工作模式,主要用于地面动目标搜索及跟踪,而雷达图像则可为检测出的动目标提供地理定位参考。传统的GMTI方法对动目标速度估值不够准确,作者改进了原来的方法,提高了动目标速度估值准确性,更便于后续的航迹相关处理。当动目标轨迹得到后,其在雷达图像上因为多普勒效应产生了移位,本文介绍了通过频谱搬移将动目标在雷达图像上重新定位的方法,得到了真实的动目标轨迹。文章最后利用雷达实测数据进行处理,得到了较满意的结果。

The Improvement of SAR/GMTI and Relocation of the Moving Target on Radar Image

SAR is a type of radar for high resolution image. GMTI is one of the modes for SAR which is used to search and track for moving target and the radar images can provide reference for the target. Conventional GMTI method is not so good to estimate the velocity of the moving target accurately. The authors improve the method for more accurate estimated velocity which brings convenience for plot-track association. The trajectory of the moving target will be ill positioned on the radar image by Doppler effect. The paper presents a method which can relocation the target by spectrum moving. At last, some satisfying results based on the raw radar data are presented.