视场网状分区域建模的星敏感器标定方法  

Star tracker calibration method based on the model of net zone-division field of view

作　　者：金荷 毛晓楠 孙少勇[1,2] 余路伟 周琦 张晴 Jin He Mao Xiaonan Sun Shaoyong Yu Luwei Zhou Qi Zhang Qing(Shanghai Institute of Spaceflight Control Technology, Shanghai 200233, China Research and Development Center of Infrared Detection Technology, China Aerospace Science and Technology Corporation, Shanghai 200233, China School of Computer Science and Information Engineering, Shanghai Institute of Technology, Shanghai 201418, China)

机构地区：[1]上海航天控制技术研究所,上海200233 [2]中国航天科技集团公司红外探测技术研发中心,上海200233 [3]上海应用技术大学计算机科学与信息工程学院,上海201418

出　　处：《红外与激光工程》2017年第10期196-203,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金(61401281);上海市自然科学基金(14ZR1440700)

摘　　要：星敏感器标定是基于更高精度的测量基准对光学系统内方位元素进行建模与最优化解算的过程。针对大视场星敏感器光学系统误差分布非理想轴对称的实际情况,提出了一种采用视场网状分区域建模的内方位元素最优化解算方法。首先,在补偿了星敏感器与标定系统初始对准误差后,基于针孔模型计算主点和焦距;然后,在视场分区域建模思想的指导下,采用多项式拟合结合双线性插值的方法修正畸变;最后,提出了基于测角误差的标定精度评价准则。经实验室标定与外场观星验证,x轴与y轴标定残差较全局建模法分别降低了35%和20%,证明了该方法的有效性。Based on the measuring benchmark of higher precision, the inner orientation elements of star tracker were modeled and optimized. Because of the fact that the error of the optical system with large FOV is not ideally axial symmetry, a calibration model based on net zone-division field of view and the corresponding optimization method was proposed to calculate inner orientation elements of star tracker. Firstly, the principle point and focal length were resolved based on pinhole model after the compensation of initial alignment error. Then, the polynomial combined with bilinear interpolation was used to correct the optical distortion under the guidance of zone-division modeling theory. Finally, measurement angle error was applied to the accuracy evaluation of calibration, A calibration experiment in lab and a real sky test validated the proposed method with the residual error of x axis decreased by 35% and y axis decreased by 20%.

关 键 词：大视场星敏感器 分区域校正 双线性插值 测角误差 初始对准误差 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]