Composite anti-interference controller comprising measurement and input time delay for flexible spacecraft

Abstract

The invention discloses a composite anti-interference controller comprising measurement and input time delay for a flexible spacecraft and relates to attitude control of the flexible spacecraft under time-varying delay and multi-source interference. The method comprises the following steps of: establishing a dynamical model of the flexible spacecraft; constructing a composite anti-interference controller comprising measurement and input time delay, estimating and performing feed-forward compensation on the anti-interference controller according to an interference observer comprising measurement time delay with interference design caused by vibration of flexible accessories, and designing a state feedback H8 controller to suppress the anti-interference controller according to the norm-bounded interference; designing gain of the interference observer to guarantee the stability of an interference estimated error dead time delay equation according to the 3 / 2 stability theorem; and finally, designing the gain of the state feedback H8 controller for a composite control system comprising measurement and input time delay based on a convex optimization algorithm, so that the system is stabilized, and a certain H8 performance is met. The composite anti-interference controller has the advantages of high interference resistance, convenience in design and the like and can be used for the attitude control of the flexible spacecraft comprising measurement and input time delay.

Description

technical field [0001] The invention relates to a flexible spacecraft attitude controller, in particular to a design of an anti-jamming attitude controller with time-varying time-delay in measurement and input, which can be used for a flexible spacecraft attitude with multi-time-varying time-delay and multi-source interference control. Background technique [0002] With the rapid development of aerospace technology, higher and higher requirements are put forward for spacecraft such as satellites and space stations, which makes the structure of the spacecraft more and more complex, often carrying large flexible solar panels, large antenna arrays, etc. Attachment, which brings great difficulty to the design of spacecraft attitude control system. [0003] Various advanced control methods have been applied to the attitude control of flexible spacecraft, such as sliding mode variable structure control, adaptive control, etc., among which the robust H ∞ The control method can ef...

AI Technical Summary

Problems solved by technology

Disturbance Observer and H ∞ The compound control method combining controllers has been studied a lot, but the current research rarely considers the time lag

However, time lag is an important factor affecting the accuracy and stability of the attitude control of flexible spacecraft. It will make the reliability of the control system worse, the stability will be reduced, the control effect will be poor, and it will even lead to the instability of the feedback control system. The safety of the spacecraft is extremely detrimental, where the measurement and input delays are the two main delays that exist in flexible spacecraft

Even if the current research considers the time delay, it often only considers the state time delay in the model. At present, there is no research on the compound control method that considers the measurement and input time delay. In addition, it is often assumed that the state time delay is known and constant. Conditions are too harsh, and the time delay in a flexible spacecraft should be time-varying

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