Spacecraft close-distance safe operation control method based on equal collision probability line method

Abstract

The invention discloses a spacecraft close-distance safe operation control method based on an equal collision probability line method. The method is used for realizing autonomous obstacle avoidance and safe approach of a target spacecraft and a tracking spacecraft, and comprises the following steps: establishing a coordinate system and a relative kinetic equation, performing uncertainty propagation analysis, calculating collision probability, establishing an equal collision probability line method, calculating and analyzing obstacle avoidance control force, determining parameter selection standards, calculating tracking control force and total control force. Taking uncertain factors into consideration, the spacecraft close-distance safe operation control method based on the equal collisionprobability line method still has the advantages of small calculated amount and guaranteed real-time performance; a set of parameter selection principle of an equal collision probability line gradient estimation method is established, so that the parameters in the potential function can be conveniently selected; and meanwhile, by improving the LQR controller, higher control precision and robustness can be obtained.

Description

technical field [0001] The invention relates to the technical field of spacecraft motion control, in particular to a control method for close-range safe operation of spacecraft based on the equal collision probability line method. Background technique [0002] In recent years, on-orbit failures of spacecraft have been increasing. In order to reduce the probability of on-orbit failures, extend the working life of spacecraft, and improve work performance, more and more on-orbit services are applied to spacecraft. As a basic technology supporting on-orbit service, distance operation needs to meet strict safety requirements for close-range operation of spacecraft. [0003] At present, the Artificial Potential Function (APF) method is usually used to ensure the safety of close-range operation of the spacecraft. This method has the characteristics of simple calculation and easy theoretical proof, but because the artificial potential function does not consider the influence of unce...

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Problems solved by technology

[0005] Although the existing methods can reduce the amount of calculation of the collision probability to a certain extent, the amount of calculation is still large, and it is difficult to ens

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