GRACE-FO卫星星敏感器/加速度计安装矩阵校准  

SCA/ACC alignment algorithm for GRACE-FO

作　　者：黄志勇 李姗姗[1] 李世忠 王傲明 黄令勇 朱雷鸣 潘星辰 牛晗晗 HUANG ZhiYong;LI ShanShan;LI ShiZhong;WANG AoMing;HUANG LingYong;ZHU LeiMing;PAN XingChen;NIU HanHan(The Institute of Geospatial Information,Information Engineering University,Zhengzhou 450001,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;School of Artificial Intelligence,Sun Yat-sen University,Zhuhai 519000,China)

机构地区：[1]信息工程大学地理空间信息学院,郑州450001 [2]地理信息工程国家重点实验室,西安710054 [3]中山大学人工智能学院,珠海519000

出　　处：《地球物理学进展》2024年第1期87-99,共13页Progress in Geophysics

基　　金：国家自然科学基金面上项目和青年项目(42174007,42204009)联合资助。

摘　　要：为了对GRACE-FO卫星入轨后的星敏感器安装矩阵进行校准,本文从相对安装矩阵校准和星敏感器/加速度计绝对安装矩阵校准两方面来实现星敏感器定标.通过统计卫星自发射以来的星敏间的四元数观测值,估计了星敏感器间的相对安装矩阵偏差.将相对安装矩阵偏差应用于星敏主光轴夹角计算和融合定姿,均表明本文采用的相对安装矩阵估计算法的正确性.利用卫星在KBR天线相位中心定标期间的俯仰和偏航机动信号,以星敏感器计算的卫星角加速度为观测值,以加速度计角加速度作为基准值,基于最小二乘算法估计星敏感器/加速度计绝对安装矩阵偏差,在估计时考虑加速度计轴间非正交性因子.获得的星敏感器/加速度计安装矩阵绝对偏差在横滚、俯仰、偏航三个方向分别为0.07°、0.19°、-0.07°,估计精度为0.01°、0.04°、0.04°.同时,研究表明星敏感器/加速度计安装矩阵偏差量与加速度计轴间非正交因子具有很强的耦合特性,同时估计两种参数可以避免参数估计时的耦合效应.In order to calibrate the star sensors installation matrix of GRACE-FO satellite in orbit,this paper realizes the calibration of star sensor from two aspects,relative installation matrix calibration and absolute installation matrix calibration of SCA/ACC.By counting the quaternion observations between star sensors since launch,the relative installation matrix deviation between star sensors is estimated.The relative installation matrix deviation is applied to the calculation of inter-boresight angles of star sensors and the fusion attitude,which shows that the relative installation matrix estimation algorithm adopted in this paper is correct.Using the pitch and yaw maneuvering signals of the satellite during KBR antenna phase center calibration,the angular acceleration calculated by the star sensors are taken as the observed value and the angular acceleration of the accelerometer is taken as the reference value.The absolute installation matrix deviation of the SCA/ACC is estimated based on the least square algorithm,and the non-orthogonal factor between the accelerometer axis is considered in the estimation.The absolute deviation of the installation matrix of the SCA/ACC is 0.07°,0.19°and-0.07°in the three directions of roll,pitch and yaw,respectively,and the estimated accuracy is 0.01°,0.04°and 0.04°.At the same time,there is a strong coupling property between the deviation of the SCA/ACC installation matrix and the axis non-orthogonal factor of the accelerometer,and the coupling effect can be avoided by estimating two parameters at the same time.

关 键 词：星敏感器 加速度计 GRACE-FO GRACE 定标 校准 

分 类 号：P228[天文地球—大地测量学与测量工程]