A Spacecraft Relative Position Control Method Based on Finite Time Distributed Velocity Observer

Abstract

A method for controlling the relative position of a spacecraft formation based on a finite-time distributed velocity observer belongs to the field of relative position control of a spacecraft formation. The present invention firstly represents the communication topological relationship among formation members according to the dynamic model of the relative position of the spacecraft and uses graph theory; then designs a finite-time distributed velocity observer; The control method for the crew members to reach their desired positions while avoiding collisions during flight. This method realizes the finite-time estimation of the spacecraft velocity, and can independently design the controller, which is suitable for the relative position control of the spacecraft when the velocity information is missing. The distributed finite-time velocity observer is used to provide timely and accurate velocity estimation information, which not only ensures The relative positions between the spacecrafts reached the desired value, and collisions were avoided at the same time.

Description

technical field [0001] The invention belongs to the technical field of relative position control of spacecraft formations, and in particular relates to a relative position control method of spacecraft based on a finite-time distributed velocity observer. Background technique [0002] With the development of aerospace science and technology, spacecraft formation technology has become a new model for performing tasks such as deep space exploration and earth observation. In order to ensure the smooth implementation of the above tasks, multiple spacecraft need to fly in formation in a specific configuration, so relative position control is the most basic requirement in the field of spacecraft formation. Usually the spacecraft flying in orbit can obtain position and velocity information from the measurement of ground target references and known beacons, or use on-board navigation instruments for autonomous sidetracking. However, considering that the velocity of the spacecraft ca...

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Problems solved by technology

[0005] The object of the present invention is to provide a method for controlling the relative position of spacecraft based on a finite-time distributed velocity observer, solve the problem of relative position control of spacecraft formations without velocity measurement information, realize the relative position control of spacecraft formations and avoid the Collision in

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