星敏感器星点能量分布数学模型及其对精度的影响分析  

Analysis of the Star Image Energy Distribution Mathematical Model and Its Effect on the Accuracy for a Star Tracker

作　　者：张新宇[1] 郝云彩[1] 

机构地区：[1]北京控制工程研究所,北京100190

出　　处：《空间控制技术与应用》2013年第3期14-18,23,共6页Aerospace Control and Application

基　　金：国家自然科学基金资助项目(61174004)

摘　　要：为解决高斯能量分布与实际星点能量分布存在偏差的问题,推理了高斯能量分布模型的合理性并进行了仿真验证.针对星图去噪预处理建立了高斯去底能量分布数学模型,在此基础上根据采样中的饱和现象建立了高斯顶底均去能量分布数学模型,通过仿真分析比较了两种模型参数对于星点提取精度的影响特性,可以为提高星敏感器星点提取精度提供参考.There are deviations between the Gaussian energy distribution model and the actual distribution of the star spots. In order to solve this problem, the rationality of the Gaussian energy distribution model with the simulation verification is reasoned in this paper. Gaussian-bottom-cutting energy distribution model is established aiming at the denoising in star tracker preprocessing,and then Gaussian-tip-bottom- cutting is established according to the actual saturation in sampling. And the effect of the two models on the precision of the star centroid extraction are examined and compared accordingly through the simulation analysis. This can provide reference for improving the precision of the star spot centroid extraction.

关 键 词：星敏感器 星点质心 高斯分布 去噪 

分 类 号：V448.235[航空宇航科学与技术—飞行器设计]