基于蒙特卡罗法的星载太阳辐照度光谱仪对日指向误差分析  

Analysis of sun pointing error of spaceborne solar spectroradiom⁃eter based on Monte Carlo method

作　　者：郭旭[1,2] 胡春晖 颜昌翔[1] 郭永飞[1] 马泽龙[1] 胡庆龙[1] GUO Xu;HU Chun-hui;YAN Chang-xiang;GUO Yong-fei;MA Ze-long;HU Qing-long(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春吉林130033 [2]中国科学院大学,北京100049

出　　处：《光学精密工程》2021年第3期474-483,共10页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.61805235)。

摘　　要：为保证光谱仪能够获取到有效太阳光谱数据,要求搭载光谱仪的二维转台能够长时间高精度跟踪太阳,而跟踪太阳的前提是转台实现精准指向,使太阳进入导行镜的有效视场。根据从卫星接收的太阳矢量和姿态数据对安装误差进行修正,计算修正后转台指向的参考值,并确保指向误差小于1°。在转台各个基准立方镜上建立坐标系,采用坐标变换法建立了对日指向的数学模型,通过运动学反解给出转台调整角度与轨道坐标系下太阳矢量的解析关系。然后,结合光谱仪的在轨运动形式,对其工作过程中的主要误差来源进行分析,并在MatLab平台上搭建基于蒙特卡罗法的指向误差模型。仿真结果表明指向误差优于0.35°。最后,在地面开展太阳指向模拟实验,测得春分轨道下指向误差低于0.16°,满足导行镜捕获视场需求。实验结果验证了数学模型的正确性及有效性,同时为光谱仪在轨工作提供了设计参考。To guarantee the efficient operation,that is,capture of solar spectral data,of a solar spectrora⁃diometer,the two-dimensional pointing turntable that carries the spectrometer should precisely track the sun over long periods.Highly precise sun pointing ensures that the sun stays in the effective field of vision of the guide telescope.Specifically,according to the solar vector and positioning data received from the satellite,the assembly error is corrected and the reference data for pointing are calculated after correction,ensuring that the pointing error is less than 1°.To accomplish this,coordinate systems were built into all the hexahedral reference prisms on the turntable.and the mathematical model of sun pointing was imple⁃mented using the transformation matrices of the coordinate systems.Further,the relationship between the turntable's angle of adjustment and the solar vector on the orbit coordinate system was derived using in⁃verse kinematics.then the main source of error during operation of the spectrometer was analyzed along with its mode of operation in orbit;from these analyses,the pointing error model was built based on the Monte Carlo method on MATLAB.The model was employed to perform a simulation and analysis of sun pointing.The simulation results demonstrate that the pointing error is less than 0.35°.Finally,the simula⁃tionwas performed to obtain the result that the pointing error under the vernal equinox orbit is less than 0.16°,meeting the requirement for the field of view of the guide telescope.The correctness and effective⁃ness of the mathematical model presented in this paper are validated based on the test results,which simul⁃taneously offer a design reference for the spectrometer.

关 键 词：星载光谱仪 坐标变换 运动学反解 蒙特卡洛 指向误差 

分 类 号：V447.[航空宇航科学与技术—飞行器设计]