提高星图正确匹配率的新方法  

A New Method for Improving Star Map Right-Matching

作　　者：刘美莹[1,2] 汶德胜[1] 冉晓强[1,2] 

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院研究生院,北京100039

出　　处：《电光与控制》2009年第9期40-43,共4页Electronics Optics & Control

基　　金：国家自然科学基金(60532070)

摘　　要：在CCD星敏感器中,快速而可靠的星图识别算法成为星敏感器确定姿态的最关键部分。针对星图识别中误匹配点的存在,提出了一种新的剔除误匹配点的方法—累积偏差法,选取合适的判定阈值对实验数据进行筛选,并结合最小二乘曲面拟合法对实验数据进行误差分析,实验结果表明,采用此方法,可以很好地剔除星图识别中的误匹配点,在赤经(α)和赤纬(δ)方向拟合偏差平均值可达到5.267 2,″星图正确匹配概率大大提高。For star sensors in CCD, a fast and reliable star map identification algorithm is the most critical part for determining star sensor attitude. Since mismatching is existed in star map identification, a new method, cumulative departure method, was proposed to eliminate the mismatching points. The appropriate value was selected to filtrate the experimental data, and the error of the experiment data was analyzed with the least square surface fitting method. The experimental results showed that the mistaken matching points of the star map can be removed effectively by using this method; the average fitting error is 5. 267 2″ in the direction of α and δ, and the correct matching probability of star map is greatly improved.

关 键 词：星敏感器 星图识别 曲面拟合 误差分析 

分 类 号：V447[航空宇航科学与技术—飞行器设计]