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 validity of the geometric correction algorithm.

国家自然科学基金资助项目