环境减灾卫星CCD影像精纠正方法研究  

Rectification Method of Linear CCD Image from HJ-1A/1B Satellites

作　　者：潘励[1] 何潇[1] 

机构地区：[1]武汉大学遥感信息工程学院,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2013年第6期631-636,共6页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2009AA122002-4);高等学校博士学科点专项科研基金资助项目(20110141110044)

摘　　要：针对环境减灾卫星配备的CCD传感器宽幅侧视观测特点,构建了一种在线阵传感器共线方程基础上的扩展几何模型。用多项式和分段Hermite插值拟合卫星外定向参数,用高次多项式拟合成像畸变,应用谱修正解法克服系统病态造成的不收敛问题。针对该模型对图像控制点分布的特殊要求,提出一种基于二分图匹配算法的控制点自动搜索策略。实验表明,本文模型对于环境减灾卫星CCD影像的几何纠正精度以及对求解所需条件数的要求,都优于现有的通用模型方法。According to the character of the CCD sensors which set up on HJ-1A/1B satel- lites, a new imaging model which is extended from the collinear equation for linear sensor is built. In this model, quadratic polynomial and Hermite interpolation polynomial are em- ployed for fitting the variation of the exterior orientation elements, and high-order polynomi- al is used as distortion model, plus engaging iteration method to solve the frequent problem, ill-conditioned system. Furthermore, we also present a method based on bipartite graph matching for correspondence points matching to meet the requirement of the distribution of control-points. The empirical results show that the proposed model compared with existing models such as quadratic polynomial and rational function model is able to achieve a higher accuracy, and requires for smaller condition number, that is sufficient for keeping pace with the demand of the research for global land cover.

关 键 词：环境减灾卫星 大视场角侧视观测 控制点分布优化 

分 类 号：P237.3[天文地球—摄影测量与遥感]