Star sensor calibration method based on pitching rolling and rotating table and nonlinear optimization

Abstract

The invention discloses a star sensor calibration method based on a pitching rolling and rotating table and nonlinear optimization. According to the method, firstly, a star sensor calibration system based on the pitching rolling and rotating table and nonlinear optimization is built, wherein the system comprises a parameter initial value estimation module, a parameter recording module, a parametersolving module, a parameter optimization module and a parameter determining module. The method sequentially comprises the following steps of estimating the focal length of the star sensor and the initial value of the main point; recording the mass centric coordinates of the star point light spots in a star sensor measuring coordinate system and the direction vector of parallel light in the star sensor measuring coordinate system after the rotation; solving the angle distance cosine value of the star point light posts in different coordinate systems; building optical parameters of a target function optimized star sensor; judging whether the algorithm meets the iteration termination conditions or not through the star point light spot re-projection errors for determining the final optimization parameters. The method has the advantages that the optical parameters of the star sensor are calibrated; meanwhile, the rotation matrix between the pitching rolling and rotating table and the starsensor can be eliminated.

Description

technical field [0001] The invention relates to a calibration method for a star sensor, in particular to a calibration method for a star sensor based on a pitch-roll table and nonlinear optimization. Background technique [0002] The star sensor is the most important attitude measurement sensor in the spacecraft at present, and its accuracy directly affects the attitude positioning accuracy of the spacecraft, so it is particularly important to calibrate its optical parameters. The optical parameters of the star sensor mainly include its principal point and focal length. Usually, in the development process of the star sensor, there will be errors in the principal point and focal length. These errors will affect the accuracy of the centroid positioning of the star sensor and reduce the star map The accuracy of the recognition algorithm affects the attitude positioning accuracy of the star sensor. [0003] The traditional method of calibrating the star sensor by rotating the p...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a star sensor calibration method based on pitch and roll table and nonlinear optimization, to solve the problem of relatively large optical parameter errors of traditional star sensors

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