Under-actuated spacecraft hovering asymptotic control method losing radial control

Abstract

The invention provides an under-actuated spacecraft hovering sliding mode control method losing radial control, which establishes a dynamics model by targeting the hovering control problem of the driving spacecraft. The under-actuated spacecraft hovering asymptotic control method comprises steps of analyzing system energy control performance under an under-actuated condition of losing radial control acceleration on the basis of the dynamics model, providing a hovering orientation feasible set under the condition, and adopting a sliding mode control method to design the close-loop control law under the radial under-actuated condition with the model as the controlled object. The under-actuated controller can drive the tracing spacecraft to gradually advance to and maintain steady at the feasible hovering orientation, the closed loop system has good robustness and dynamic performance on the external perturbation and the model error, and solves the under-actuated spacecraft hovering control problem which losses the radial control acceleration.

Description

technical field [0001] The present invention relates to a flight control method of a spacecraft, and more specifically relates to an asymptotically stable control method for hovering of an underactuated spacecraft lacking radial control. Background technique [0002] The hovering of a spacecraft refers to keeping its relative position relative to a certain target spacecraft in space unchanged by exerting a continuous control force on the tracking spacecraft. Hovering technology has broad application prospects in space missions. For example, hovering over asteroids can provide effective high-resolution scientific observations. In addition, the hovering of the earth orbiting spacecraft keeps the tracking spacecraft relatively stationary to the target spacecraft, which is conducive to close-range operations such as space maintenance and space observation, and reduces the difficulty and risk of space mission operations. The existing hovering control methods of spacecraft all as...

AI Technical Summary

Problems solved by technology

Although formation flying and hovering belong to the category of relative motion of spacecraft, their orbital properties are different, so the corresponding controller designs are different.

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