Calibrating of the in-orbit center-of-mass offset of gravity satellite by accelerometer data
A method for calibration of the in-orbit center-of-mass offset only on accelerometer data is proposed in order to address the issue of calibration of the in-orbit center-of-mass offset of gravity satel-lite.With ACC1A data as input,and the Butterworth filter is utilized to remove noise from the data.The linear acceleration and angular acceleration signals caused by the calibration maneuver of center-of-mass are extracted,and finally,the center-of-mass offset is calibrated using the least squares estima-tion.The method for calibration of the in-orbit center-of-mass proposed in this paper is validated using the accelerometer data from the GRACE-FO C satellite,and the center-of-mass offset since the satel-lite's launch is estimated.The results show that the calibration accuracy of all three axes is better than 10 μm.The RMS differences in the comparison of the center-of-mass offset results in the three-axis di-rection,obtained by using the proposed method and by calculating with attitude data,are respectively[9.6,9.3,7.9]μm,and the RMS of comparison with the center-of-mass offset published by JPL are re-spectively[7.4,3.8,4.7]μm.Different from the traditional method,because only accelerometer data is used,the proposed method can be used for calibration of the in-orbit center-of-mass in the case of da-ta failure of gyroscope and star camera.
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