On-orbit refueling spacecraft attitude control method

Abstract

The invention provides an on-orbit refueling spacecraft attitude control method, and the method comprises the steps: firstly calculating an error amount through a given target attitude and actual attitude; secondly calculating an auxiliary variable and a selection reaching law, introducing an inertia self-adaption law and a control gain self-adaption law, and building a self-adaption sliding mode attitude control law; thirdly taking an absolute value of a sliding mode and a first-order differential thereof as the input of a fuzzy adjuster so as to effectively inhibit the vibration of sliding mode control, taking the thickness of a sliding mode boundary layer as the output of the fuzzy adjuster, building a self-adaption sliding mode attitude control law with a fuzzy boundary layer, and carrying out the online adjustment of the thickness of the sliding mode boundary layer through the fuzzy adjuster. A closed-loop system controlled through the method can enable the actual attitude to be stably adjusted to a target attitude, and achieves the good robustness and control precision for a rotational inertia time varying effect and external disturbance. The method provides an effective means for the engineering implementation of the on-orbit refueling spacecraft attitude control.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to an attitude control method of an on-orbit refueling spacecraft. Background technique [0002] On-orbit refueling of spacecraft refers to the rendezvous and docking with the spacecraft that needs to be replenished with propellant through a spacecraft carrying propellant, and then the propellant is transferred from the propellant to the propellant through the connected pipeline. The process of tank transfer to the target spacecraft's propellant tanks. On-orbit refueling technology has many advantages: through on-orbit refueling of application satellites, it can save the launch cost caused by carrying a large amount of propellant for the initial launch, prolong the service life of satellites, and avoid the huge cost of repeated launches of replacement satellites The cost has a high economic value; through the on-orbit refueling of the space mobile spacecraft, the large-sc...

AI Technical Summary

Problems solved by technology

However, in actual engineering, it is often necessary to adjust the attitude of the spacecraft at a large angle. At the same time, it is difficult to accurately model the moment of inertia of the system during the refueling process, and the effectiveness and control accuracy of the control method are difficult to guarantee.

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