俯冲弹道前斜视SAR图像几何校正算法研究  

A Study on Image Geometric Correction Algorithm Based on Missile-borne Squint SAR with Diving Maneuver

作　　者：刘高高[1] 张林让[1] 陈广峰[1] 刘昕[1] 刘楠[1] 张波[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《现代雷达》2012年第6期45-48,共4页Modern Radar

基　　金：国家自然科学基金资助项目(60672130)

摘　　要：弹载合成孔径雷达(SAR)的成像结果受飞行轨迹的影响,会出现严重的几何失真问题。文中首先根据导弹俯冲运动特点,使用高阶逼近模型建立了SAR的回波模型;然后分析俯冲弹道前斜视SAR的几何关系,利用矢量表达式建立了目标坐标与图像坐标的关系,提出了一种适用于俯冲弹道前斜视SAR图像的几何校正算法;最后通过仿真实验验证了该算法的有效性。The strong imaging distortion is a crucial problem in the focused image by the missile-borne synthetic aperture radar （SAR）. According to the characters of missile-borne SAR with diving maneuver, echo model of missile-borne SAR is established by using a high order range model. In terms of the crucial geometric distortion in this model, a geometric correction algorithm is proposed by the vector analyses between target coordinate and image coordinate. Last simulations are figured to illustrate the validi- ty of the geometric correction algorithm.

关 键 词：几何校正 图像失真 合成孔径雷达 矢量 级数反演法 

分 类 号：TN957.52[电子电信—信号与信息处理]