Strong interference resistance control method of flexible spacecraft attitude control system

Abstract

The invention relates to a strong interference resistance control method of a flexible spacecraft attitude control system, targeting a flexible spacecraft attitude control system having a nonlinear dynamic state, flexible vibration and measurement noise multi-source interference. The strong interference resistance control method of the flexible spacecraft attitude control system comprises steps of establishing a multi-source interference resistance model according to a nonlinear euler angle kinematics and posture dynamics of the flexible spacecraft to finish multi-source interference mathematic representation and modeling, designing an interference observer on the basis of mathematic representation and modeling to perform estimation on flexible vibration, designing an extended state observer to perform estimation on a system state and a non-linear dynamic state according to output of an interference observer, designing a strong interference resistance controller according to the interference observer and the extended state observer and solving an unknown gain on the basis of pole configuration to finish design of a strong interference resistance controller according to estimation values of the interference observer and the extended state observer. The strong interference resistance control method of the flexible spacecraft attitude control system is strong in interference resistance, high in control accuracy and can be applied to high accuracy control of the flexible spacecraft.

Description

technical field [0001] The invention relates to a strong anti-disturbance control method of a flexible spacecraft attitude control system, which can realize the simultaneous compensation of multiple disturbances and unknown nonlinear functions of the flexible spacecraft, and can be used in the high-precision attitude control of the flexible spacecraft. Background technique [0002] With the development of aerospace technology, precise space missions such as gravity gradient measurement, earth observation, laser communication, and space observation have put forward extremely high requirements on the attitude control accuracy of the spacecraft. For example, the "James Webb" representative The pointing accuracy of the next-generation space telescope is required to reach 0.004 arc seconds. The high-precision attitude requirements put forward extremely high requirements on the attitude control capability of the spacecraft. However, multi-source interference such as different chan...

AI Technical Summary

Problems solved by technology

[0006] The technical solution of the present invention is to provide a flexible spacecraft attitude control method that ignores model nonlinearity, poor anti-interference ability, low control accuracy, and is difficult to simultaneously compensate for multi-source interference in the existing flexible spacecraft attitude control method. The strong anti-disturbance control method of the spacecraft attitude control system proposes a strong anti-disturbance control method for flexible spacecraft with a double-loop nested architecture using DOBC in the inner loop and ADRC in the outer loop, which has strong interference cancellation ability and high control accuracy. Advantages, can be used for high-precision attitude control of flexible spacecraft

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