Autonomous spacecraft rendezvous control method based on finite time fast nonsingular terminal sliding mode

Abstract

The invention discloses an autonomous spacecraft rendezvous control method based on a finite time fast nonsingular terminal sliding mode. The method comprises the following steps: establishing an approximate relative motion kinetic model between a tracking spacecraft and a tracked spacecraft so as to describe an action relationship of real-time control input force and lumped uncertain interferenceacting on the tracking spacecraft on an actual relative position and an actual relative speed of the two spacecrafts; designing a finite time adaptive disturbance observer to estimate lumped uncertain disturbance according to the current actual relative position, the current actual relative speed and the real-time control input force to obtain a disturbance estimation value; and designing a control unit comprising a fast nonsingular terminal sliding mode surface so as to update the real-time control input force according to the interference estimation value, the current actual relative position and the current actual relative speed. Compared with an autonomous spacecraft rendezvous linear sliding mode control method, the control method provided by the invention can realize faster dynamicresponse characteristics and higher steady-state precision.

Description

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AI Technical Summary

Benefits of technology

The present invention proposes an adaptation type interferometer called Interceptor Sliding Mode (ISM) which helps improve the precision and efficiency of communication between different systems by releasing constraints during flight or after landing. It also includes algorithms like Adapted Loss Functional Theory (ALF), Time Division Multiplex Distance Estimation Algorithm(TDMAE). These techniques help reduce error accumulation over long periods of operation without requiring detailed knowledge about how these types of interfaces behave under complicated dynamic environments. Overall, this technology enhances overall performance and reliability of navigation and other applications involving multiple aircraft platforms.

Problems solved by technology

The technical problem addressed in this patented text relates to improving the efficiency at reconnecting two spaceships during spaceflight operations without causing delays caused by conventional autonomy systems.

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