Determining method for ultrahigh-accuracy attitude of spacecraft multi-stage compound control system

Abstract

A determining method for ultrahigh-accuracy attitude of a spacecraft multi-stage compound control system. The determining method comprises the following steps: (1) establishing an attitude constraintmodel between a star and a load as well as between the load and a fast reflective mirror of the spacecraft multi-stage compound control system; (2) establishing a relative attitude quaternion model between the star and the load as well as between the load and the fast reflective mirror; (3) judging whether a star guiding sensor has a measured value or not; (4) establishing a load attitude estimation error state equation if the star guiding sensor has no the measured value, estimating a load attitude by adopting a Kalman filtering method, and realizing determination on high accuracy of the loadattitude; (5) establishing a star attitude estimation error state equation, and realizing determination on high accuracy of a star attitude by adopting the Kalman filtering method; (6) estimating a load sight attitude by adopting a measured value qfm of the star guiding sensor if the star guiding sensor has the measured value; (7) establishing the load attitude estimation error state equation, estimating the load attitude by adopting the Kalman filtering method, and realizing the determination on high accuracy of the load attitude; (8) establishing the star attitude estimation error state equation.

Description

technical field [0001] The invention belongs to the field of attitude control of spacecraft, and relates to an ultra-high-precision attitude determination method for multi-level compound control of a spacecraft, which realizes high-precision determination of attitude for multi-level compound control of a spacecraft. Background technique [0002] With the continuous improvement of astronomical observation requirements, the design ideas and practices of contemporary astronomical optical telescope control systems have undergone revolutionary changes. That is, the development from a single-level control system to a multi-level composite control system has greatly improved the control performance of astronomical optical loads. The spacecraft multi-level compound control system was born to meet the demand for high-precision attitude control of this type of optical load. The spacecraft multi-level composite control system refers to the spacecraft platform with three super control ...

AI Technical Summary

Problems solved by technology

[0004] 1. The existing measurement configuration cannot realize the multi-level attitude measurement of the spacecraft

[0005] The conventional measurement configuration in the current attitude determination system is that the star sensor and gyroscope can only realize the attitude measurement of the spacecraft star, a

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