Six-degree-of-freedom fixed-time rendezvous docking control method for spacecraft

Abstract

The invention discloses a six-degree-of-freedom fixed-time rendezvous docking control method for a spacecraft. Installation errors of a booster are taken into consideration. The method comprises the steps that under the situation that the installation errors of the booster existing in a service spacecraft are taken into account, a six-degree-of-freedom rendezvous docking motion model of the service spacecraft and a rolling target spacecraft is constructed, wherein the model comprises the motion descriptions of the relative position and relative attitude between the two spacecrafts; based on the established rendezvous docking motion model in which the installation errors of the booster are taken into account, and by using related motion variations, a new fixed time sliding surface is obtained; a fixed time rendezvous docking controller is obtained based on the sliding surface, and an installation error angle of the booster is estimated by constructing new adaptive rules. The method hasthe advantages of fixed time characteristics, high controlling precision, parameter overestimation preventing and the like, and the method is suitable for a six-degree-of-freedom spacecraft rendezvousdocking control mission with higher timeliness demands.

Description

technical field [0001] The invention relates to the technical field of spacecraft control, and is mainly applied to six-degree-of-freedom motion control in spacecraft rendezvous and docking, and specifically relates to a spacecraft six-degree-of-freedom fixed-time rendezvous and docking control method considering propeller installation deviation. Background technique [0002] At present, with the development of aerospace technology, countries have launched a large number of spacecraft. How to realize the rendezvous and docking of the service spacecraft and the tumbling target spacecraft is an important guarantee for the service spacecraft to complete on-orbit maintenance. At the same time, rendezvous and docking operations often have time constraints, requiring the completion of related tasks within a certain period of time; in addition, considering that there are propeller installation deviations in the service spacecraft in practice, the six freedoms in the rendezvous and d...

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Problems solved by technology

[0003] There are not many studies on the six-degree-of-freedom rendezvous and docking control of the service spacecraft and the tumbling target spacecraft, and the current research mainly includes two problems: (1) Most of the control strategies considering the six-degree-of-freedom rendezvous and docking cannot ensure the correlation. The operation is completed within a specified time period, which is less feasible in actual operation; (2) The existing adaptive control strategy used to deal with the installation deviation of the spacecraft propeller is prone to parameter overestimation or conservative The situation will lead to a large deviation between the estimated value of the parameter and the actual value

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