High-precision star sensor installation matrix in-orbit real-time calibration method

• Main Authors: MAO XIAONAN, JIN HE, WANG YANQING, ZHENG XUNJIANG, LI XINPENG
• Format: Patent
• Language: Chinese; English
• Published: 13.10.2017
• Subjects: GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING

The invention relates to a high-precision star sensor installation matrix in-orbit real-time calibration method. The method comprises the steps that actual measurement installation relation quaternion is resolved, the vector part of the installation relation quaternion is subjected to filtering and calibration, and an installation matrix is resolved by means of the calibrated installation relation quaternion. Accordingly, on the condition that no accurate prior information exists, filter is given by measuring a residual sequence to achieve criterion convergence, if convergence is conducted, a decay factor takes 1, and a parameter R is estimated online so as to avoid criterion convergence failure; if divergence is conducted, the decay factor is resolved in real time, the weight of current beat in the filtering process is adjusted, and the problem that due to the fact that a model is inaccurate, the filer performance is lowered or even divergence is conducted can be effectively solved. Accordingly, real-time ca