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

Abstract

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 caliberation compensation is conducted on the installation matrix, a large amount of measurement information does not need to be stored, the vector of the installation relation quaternion is filtered directly, but not a three-axis euler angle, and an error introduced by reverse triangle resolving is avoided.

Description

Technical field [0001] The invention relates to an on-orbit real-time calibration method for an installation matrix of a high-precision star sensor. Background technique [0002] As the most accurate attitude sensor at present, the star sensor has been widely used in space missions. The traditional star sensor starlight comes from a single field of view, limited by the field of view, and the angular distance between the stars is small. As a result, the calculated attitude angle accuracy of the optical axis is an order of magnitude lower than that of the other two axes, resulting in inconsistent three-axis attitude accuracy. When stray light enters the field of view, or is affected by space radiation, the stable and reliable output attitude may not be possible. [0003] In order to further improve the performance of star sensors, the concept of multi-field star sensors has appeared abroad in recent years. Such as the Hydra star sensor from Sodern in France, the FSC-701 star sensor...

AI Technical Summary

Problems solved by technology

The measured installation relationship calculated directly from the quaternions output by each probe contains error components of different frequencies, so filtering and denoising cannot be done simply. If this value is directly used without processing, the measurement error will cause the fusion result to fail to meet the requirements.

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