引入坐标映射原理的弹载SAR图像几何校正算法  

Missile-Borne SAR Image Geometry Correction Algorithm Introduced Coordinate Mapping

作　　者：叶晓明[1] 张国峰[1] 胡晓光[1] 

机构地区：[1]北京航空航天大学虚拟现实技术与系统国家重点实验室,北京100191

出　　处：《计算机辅助设计与图形学学报》2015年第2期201-207,共7页Journal of Computer-Aided Design & Computer Graphics

基　　金：虚拟现实技术与系统国家重点实验室开放基金(27064808)

摘　　要：针对弹载合成孔径雷达(SAR)在下压阶段采用频谱分析(SPECAN)算法时所得到的SAR图像存在几何失真的问题,提出一种基于坐标映射思想的高精度弹载SAR图像几何校正算法.首先根据弹载SAR下压阶段的三维几何关系建立点目标的回波模型;然后详细分析了适于下压阶段SPECAN算法的坐标映射原理,通过将SAR图像坐标系上的点逐一映射到空间地距坐标系中完成几何校正.仿真实验结果表明,文中算法是有效的,误差分析结果也表明该算法比其他算法精度高.In order to solve the image geometric distortion problem of missile-borne synthetic aperture radar（SAR） when using spectral analysis （SPECAN） algorithm during the down flight stage, a novel approach basedon coordinate mapping principle is introduced in this paper. According to the geometry of missile-borne SAR,echo model of point target is established. Then the coordinate mapping principle which is suitable for SPECANalgorithm during the down flight stage is analyzed in detail. Through mapping each point of the SAR image coordinatesystem to the spatial distance coordinate system, we finish the correction. Extensive simulation resultscorroborate the validity of the proposed method. Furthermore, compared with other correction algorithms, the erroranalysis indicates that the proposed algorithm of this paper is more accurate and superior.

关 键 词：弹载合成孔径雷达 下压阶段 频谱分析算法 坐标映射 几何畸变校正 

分 类 号：TN958[电子电信—信号与信息处理]