Spacecraft automatic rendezvous obstacle avoidance method and system

Abstract

The invention discloses a spacecraft automatic rendezvous obstacle avoidance method and system. The method comprise the steps of solving the shortest Euler distance under the ellipsoid, constructing atarget attraction potential function, constructing an obstacle avoidance potential function under the sigmoid function, designing a controller based on a speed artificial potential function, and designing a suboptimal speed artificial function controller based on the state dependent Riccati equation. The method is applicable to spacecraft automatic rendezvous obstacle avoidance control, and can calculate the distance between the spacecraft and a target spacecraft or an obstacle more accurately through determining the shortest Euler distance under the ellipsoid, thereby being capable of more accurately controlling the trajectory of the spacecraft, and reducing unnecessary fuel consumption; and meanwhile, the sigmoid function is introduced into the aerospace field for the first time to define the obstacle avoidance potential function so as to form the overall potential function and thus design appropriate control laws, thereby being capable o more accurately controlling the trajectory of the spacecraft when being away from or getting close to the obstacle, and having more accurate flight trajectory and higher response speed.

Description

technical field [0001] The present invention relates to the technical field of spacecraft autonomous rendezvous, in particular to a method and system for spacecraft automatic rendezvous and obstacle avoidance. Background technique [0002] Since the 1980s, relevant units have proposed the rail express train plan, among which the rail express train plan mainly has the following significance: [0003] (1) Extend the life of the satellite and improve the survivability of the satellite in orbit. Orbit express satellites have the ability of "self-maintenance and maintenance" and "mutual maintenance and maintenance", which can greatly improve and prolong the viability and lifespan of satellites in orbit; [0004] (2) Perform future maintenance missions to save satellites in distress. In the next few years, all existing space shuttles in the United States will be decommissioned, and the task of maintaining important US spacecraft in orbit in the future will naturally fall to new ...

AI Technical Summary

Problems solved by technology

Obviously, the traditional method will cause redundancy in the description of obstacles and reduce the control accuracy

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