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.
Star sensorAccelerometerGRACE-FOGRACECalibrationAlignment
万方数据
维普
