顾及光行差改正的遥感卫星成像模型及验证  

Construction and Verification of Imaging Model for Optical Remote Sensing Satellite Considering the Correction of Aberration of Light

作　　者：张宏伟[1] 张炳先[1,2] 侯作勋 彭呈祥[1] ZHANG Hongwei;ZHANG Bingxian;HOU Zuoxun;PENG Chengxiang(Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China;Key Laboratory for Advanced Optical Remote Sensing Technology of Beijing, Beijing 100094, China)

机构地区：[1]北京空间机电研究所,北京100094 [2]先进光学遥感技术北京市重点实验室,北京100094

出　　处：《航天返回与遥感》2019年第4期112-121,共10页Spacecraft Recovery & Remote Sensing

摘　　要：结合光学遥感卫星的几何特性和成像机理,系统地分析了光行差效应对光学遥感卫星对地观测精度的影响。根据光行差效应影响的机理与特点,文章推导出了严格的光行差模型,并通过一个变换矩阵将该模型引入到传统共线方程模型中,实现了模型中光线真方向向量与视方向向量之间的转换。在实验阶段,通过两组实验对本模型的精度和有效性进行了对比验证,首先基于不同侧摆角的模拟影像对比分析了传统模型和本模型的定位精度,然后,结合几何定标的补偿效应,对比分析了两种初始模型及定标后的精化模型在不同侧摆角下的定向精度,进而验证各模型对光行差的改正效果。实验结果表明,文中方法可以有效的补偿卫星影像由光行差引起的几何误差,提高敏捷光学卫星大侧摆成像时的定位精度。According to the geometric characteristics and imaging mechanism of optical remote sensing satellites, the effect of aberration of light (AOL) on the geometric ground observation accuracy of the optical satellites is analyzed systematically. And then the rigorous correction model of AOL is deduced according to the mechanism and geometric characteristics of AOL effect. With the support of a transform matrix, the constructed AOL correction model is introduced into the traditional imaging model which is established according to the collinearity relationship between imagery point and ground point, thus implementing the transformation between true direction vector and viewing direction vector of the light in the imaging model. In experimental stage, the accuracy and availability of the presented imaging model is verified by two experiments. Firstly, the positioning accuracy comparison between the traditional imaging model and the presented one under different side-swing angles are done. Secondly, the orientation accuracy comparison of both models before and after geometric calibration are finished by combining the compensation effect of geometric calibration, thus verifying the correction performance of these models for AOL. The good experimental results indicate that the proposed model is effective, which can improve the positioning accuracy of satellite images with large side-swing angle for agile optical satellite.

关 键 词：光行差 严格成像模型 定位精度 几何定标敏捷光学卫星 航天遥感 

分 类 号：P237[天文地球—摄影测量与遥感]