恒星星像点亚像素质心提取算法研究  

作　　者：李品[1,2] 李如仁[1] 谢俊峰[2] 莫凡[2] 田世强[2] 孙毓晗[3] 

机构地区：[1]辽宁工程技术大学测绘学院,辽宁阜新123000 [2]国家测绘地理信息局卫星测绘应用中心,北京100000 [3]辽宁师范大学,辽宁大连123000

出　　处：《黑龙江科技信息》2017年第8期23-25,共3页Heilongjiang Science and Technology Information

基　　金：国家自然科学基金(41271394);青年自然科学基金(41301525);公益性测绘行业专项(201412001;201412007;201512012);基础测绘科技项目(1461501900202)

摘　　要：卫星星图中恒星像点质心定位是星敏感器定姿的基础。质心提取的精度将直接影响到星敏感器定姿的精度。本文首先介绍和分析当前常用的几种星像点质心提取算法,如灰度加权法、高斯积分法、高斯细分法、高斯曲面解析法等。并在此基础上,利用我国首颗民用立体测绘卫星——资源三号卫星APS星敏感器下传的星图,对比各种算法星象点质心提取精度。试验以恒星星对角距为准确参考来评价星像点质心提取精度,结果表明,相对于传统灰度加权法,高斯细分法(3×3窗口)和高斯曲面解析法(3×3窗口)的结果更优,所得到的角距误差平均值分别为-3.92″、-3.77″,标准差分别为16.80、16.96″。Center determination of star spots in the star image is the foundation of star sensor＇s attitude determination . The center＇s accuracy will directly affect the precision of star sensor＇s attitude. Firstly ,This paper introduces and analysis several kinds of star spots center extraction algorithm the current commonly used, such as gray weighting method, Gaussian integral method, Gaussian segmentation method, Gaussian surface analytic method, etc. And on this basis, use the Light spot in star image transmited by APS star sensor of ZY- 3,which is the China＇s first civilian stereo mapping satellite, compare with various algorithms star center extraction accuracy. Treat star di- agonal distance as reference to evaluate the accuracy of star center extraction in star image , the conclusions show that compared with the traditional gray weighted method,results of Gaussian segmentation method （3 × 3 window） and Gaussian surface analytic method （3 x 3 window） are better, the AVG of angle error are 3.92 ＂and3.77 ＂, and Std Dev are 16.80＂and 16.96＂.

关 键 词：星图 质心提取 亚像元 高斯质心 高斯细分 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]