星敏感器高阶畸变的观星标定模型(英文)  

Higher order distortion calibration model of the internal parameters of star tracker camera with the night sky observation

作　　者：王芳[1] 刘海波[1] 王振国[1] 

机构地区：[1]国防科学技术大学航天科学与工程学院,湖南长沙410073

出　　处：《红外与毫米波学报》2014年第1期84-89,共6页Journal of Infrared and Millimeter Waves

基　　金：Supported by National Natural Science of China(61205190)

摘　　要：由于恒星具有很高的姿态精度,使得观星标定成为星敏感器相机参数标定中不可缺少的一种方法.针对高阶非线性畸变情况下的星敏感器相机参数标定问题进行研究,基于星间距的不变性建立了一个两步标定模型.设计了一个紧致的递归均值滤波器来进行参数估计,该滤波器可以在不显著增加计算量的情况下提高参数估计的精度.实验结果表明,相比已有方法,所提出的方法能够实现更高精度的星敏感器相机标定.With the high accuracy of the stellar angular positions, the camera calibration with the night sky observation is a- vailable and indispensable. In order to estimate the camera parameters even with higher order nonlinear distortions, a two- step model and the corresponding iterative optimization based on the invariability of inter-star angle were developed in this paper. Furthermore, a compact recursive average filter was designed to improve the accuracy while not adding significantly computation time. The experimental results demonstrated that the proposed model can implement star tracker camera cali- bration with higher accuracy than the known method.

关 键 词：星敏感器 标定 高阶畸变 星间角 递归滤波 

分 类 号：P236[天文地球—摄影测量与遥感]