A relative position adaptive control method for a spacecraft approaching a space tumbling target

Abstract

The invention discloses a relative position self-adaptive control method for a spacecraft approaching a space tumbling target. A new relative position dynamics model is established under the target system, and the desired position variable is transformed into a constant value. The controller design does not need complex coordinate changes, the design process is simple, and, for the uncertainty of the spacecraft mass and the approximation process In order to solve the problem of path and velocity constraints in the system, design adaptive laws and potential functions of path constraints and velocity constraints without local minimums, construct intrusive and invariant adaptive controllers, avoid potential collision problems in the approach process, and relax the conventional The dependence of the control algorithm on the accurate value of the spacecraft mass realizes fast and accurate relative position tracking control, enabling the spacecraft to quickly and accurately approach the space tumbling target under the condition of mass uncertainty, and always follow the path and speed The double constraint enables the spacecraft to complete the task of approaching the space tumbling target safely and reliably.

Description

technical field [0001] The invention relates to the technical field of autonomous rendezvous and docking control of spacecraft, in particular to a relative position adaptive control method for a spacecraft approaching a space tumbling target, which is mainly applied to spacecraft approaching under conditions of mass uncertainty and path and speed constraints Space tumbling target mission. Background technique [0002] With the vigorous development of aerospace technology, the technology of spacecraft in-orbit service is becoming more and more mature. It has strong advantages and potential application value. In emerging space missions, such as on-orbit refueling of spacecraft, on-orbit repair of faulty spacecraft, recovery and treatment of scrapped satellites, and cleanup of space junk, etc., it has shown great potential. Significant advantage. [0003] In recent years, international space agencies such as NASA and the European Space Agency have been accelerating the resear...

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Problems solved by technology

However, it does not consider the possibility that the orbiting spacecraft may collide with the tumbling target or the target's spaceborne accessories when it is approaching the space tumbling target, so this control method cannot strictly guarantee the safety of the mission

[0006] In order to realize autonomous obstacle avoidance and safe approach of space tumbling targets and tracking spacecraft, patent CN109765919A proposes a control method for close-range safe operation of spacecraft based on the equal collision probability line method. By determining the collision probability, calculating the obstacle avoidance control force, However, the uncertainty of the mass of the spacecraft is not considered, and the parameter selection process is relatively complicated. Considering the limited processing power of the spacecraft's on-board computing equipment, it poses a huge challenge to the actual on-orbit application.

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