数字式太阳敏感器系统精度提升方法及验证  

A method and validation of system accuracy improvement for digital sun sensors

作　　者：谢任远 王北超 李爽 何益康 吴迪 孙朔冬 XIE Renyuan;WANG Beichao;LI Shuang;HE Yikang;WU Di;SUN Shuodong(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Shanghai Aerospace Control Technology Institute,Shanghai 201109,China)

机构地区：[1]南京航空航天大学航天学院,南京211106 [2]上海航天控制技术研究所,上海201109

出　　处：《中国空间科学技术》2023年第5期94-100,共7页Chinese Space Science and Technology

基　　金：空间智能控制技术国防科技重点实验室开放基金(2021-JCJQ-LB-010-04,HTKJ2019KL502019)。

摘　　要：研究了利用数字式太阳敏感器获取卫星姿态角的精度提升方法。针对使用数字太阳敏感器参数直接计算姿态角存在较大系统误差的情况,利用光线传播原理,给出了修正折射影响的非线性角度计算公式,并提出了控制系统软件解算非线性方程的两种方法,以及星上编程计算的具体实现方式。最后以实测的数据进行了验证,相比于之前的无修正角度,两种修正方法的计算精度均提升了约3.94°,相比于其他系统误差修正的多元函数拟合法,精度从0.04°提升至0.02°,从而验证了该修正方法在轨编程计算实现的可行性和提高系统精度的有效性。A method of improving the accuracy of the attitude angle of a satellite obtained by a digital sun sensor was studied.Due to large systematic errors in directly computing the attitude angle by the sun sensor,the equations of nonlinear angle computation to modify refraction effects were given by the light propagation principle.Two computational methods of solving the nonlinear equations by control system software were proposed,including the specific implementation of spaceborne programming and computation.Finally,actual validation was performed by measured data.Compared with the previous uncorrected angle,the accuracy is improved by approximately 3.94°.It is improved from 0.04°to 0.02°compared with the multivariate function fitting method of other system error correction.The feasibility of spaceborne programming computation and the effectiveness of improving system accuracy were verified.

关 键 词：数字式太阳敏感器 姿态精度提升 实测验证 修正折射 星上编程计算 

分 类 号：V423.4[航空宇航科学与技术—飞行器设计]