Relative position self-adaptive control method for spacecraft approaching space rolling target

Abstract

The invention discloses a relative position self-adaptive control method for a spacecraft approaching a space rolling target. According to the invention, new relative position dynamic model is established under a target body system and an expected position variable is converted into a constant value; complex coordinate changes are not needed in the design of the controller; and the design processis simple. Moreover, in order to solve problems of spacecraft quality uncertainty and path and speed constraints in the approaching process, the method designs an adaptive law and a path constraint and speed constraint potential function without a local minimum value and an intruding and invariant self-adaptive controller is constructed, so that a potential collision problem in the approaching process is solved; the dependence of a conventional control algorithm on the accurate value of the spacecraft quality is relaxed and rapid and accurate relative position tracking control is realized; thespacecraft is made to rapidly and accurately approach a space rolling target under the condition of mass uncertainty; path and speed dual constraints are always followed, and the spacecraft is made to safely and reliably accomplish the task of approaching the space rolling target.

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...

AI Technical Summary

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.

Images