高速机动、大视场、线扫等均会引起弹载大视场线列扫描红外图像的几何畸变, 从而影响巡飞弹的整体战术效能。利用探测器像面参数、坐标变换、地表模型、物像共线方程和墨卡托地图投影模型分别建立了相机的像方坐标方程、位姿变换方程、物像转换方程和物方地图投影方程, 进而构成了从像面坐标系到地图坐标系的完整严格成像模型, 利用Matlab对该模型进行静态仿真, 确定航高、摆扫角度、地表模型等模型参数造成的几何畸变特性的强度, 为弹载几何畸变校正算法的工程优化提供了依据。

Serious geometric distortion in IR linear scanning image will affect the tactical efficiency of patrol missiles, which is generated from high speed maneuvering, large filed of view(LFOV), pendulum scanning of the missile-borne image. The strict imaging model was constructed by converting the pixel serial numbers of infrared image into certain map projection coordinates of the surfacial scene, which was composed of four equations. Image plane coordinates equation was built by pixel parameters of infrared chip surface. Image spacial coordinates equation was built to transform image plane coordinates into earth-centered earth-fixed(ECEF) coordinates. The surfacial object coordinates equation was built in ECEF system by collinear equation and the earth surface model. The last map coordinates equation was built by certain map projection model form the object ECEF coordinates. The static simulation of geometric distortion was implemented in Matlab to ascertain the effect of model parameters such as navigation height, pendulum angle, the earth model and so on. The results could be used as the basis for the engeering optimization of geometric distortion cerrection algorithm.