基于星载视频SAR的海上运动目标监视方法

Maritime Moving Target Monitoring Method Based on Spaceborne Video SAR System

摘要:

传统 SAR处理方法已无法满足日益复杂的战场环境,在监测、跟踪感兴趣区域内的机动目标和场景变化方面存在不足。针对此情况,提出了一种基于星载视频 SAR(Video SAR)的海上运动目标监视方法,通过对目标区域持续观测获得全面的目标态势信息。首先,分析了视频 SAR工作原理,采用数据重叠复用的方式来保证 SAR视频产品的流畅度；结合图像配准,再利用不同帧图像之间动目标主体位置偏差和阴影变化反演动目标速度,同时改进传统后向投影(Back Projection,BP)算法,使其适用于视频 SAR的高效性要求；最后,通过计算机仿真验证了该方法的精确性和有效性。

Abstract:

Traditional SAR processing method have been unable to meet the increasingly complex battlefield environment,especially on detecting and tracking moving target. For this situation, in this paper, a new method to monitor moving targetat sea, spaceborne video SAR, which could realize continuous observation over the interesting area to obtain all-around tar.get information was introduced. Firstly, the video SAR theory was analyzed and it was necessary to use echo data overlappattern to ensure fluency of video. Secondly, through image registration and parameter inversion, moving target’s azimuth and range information could be obtained. Then traditional back projection(BP) imaging algorithm was improved to meet vid.eo SAR’s high effectiveness. This BP algorithm could not only save resources, but also improve computing efficiency. Final.ly the simulation results justified the superiority of the new method and the extracting accuracy in movement information.