An ultra-high-precision attitude determination method for multi-stage composite control of spacecraft

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, and cannot directly measure the payload and the attitude information of the fast mirror, let alone obtain the relative attitude between the star and the payload. - The relative pose between the mirrors

[0006] 2. Existing attitude estimation methods cannot accurately realize multi-level attitude estimation of spacecraft

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