Intelligent Predictive Control Entry Guidance Method for Spacecraft

Abstract

The invention discloses a spacecraft intelligent predictive control entry guidance method. Firstly, considering the constraint conditions of the spacecraft's atmospheric entry, the guidance system is designed using the nonlinear model predictive control method, and the attenuation memory filter is introduced, and a prediction model correction method based on error information estimation is proposed. The robustness of the control system to model errors is enhanced. Then, using the guidance system as a guidance template, a sample data set is generated and a multi-layer neural network is trained offline to approximate the mapping relationship between the spacecraft's real-time flight status and guidance instructions. Finally, in the process of entering guidance, the trained neural network is used to replace the process of solving complex optimization problems and integral prediction, which reduces the time for online solution of guidance instructions. The simulation results show that the guidance method proposed by the present invention can meet the mission requirements in both accuracy and real-time performance of the guidance method in the presence of errors such as large model uncertainties.

Description

technical field [0001] The invention relates to the technical field of spacecraft guidance, in particular to a spacecraft intelligent predictive control entry guidance method. Background technique [0002] Atmospheric entry guidance is the prerequisite for a spacecraft to successfully land on a planet and conduct various scientific research and experiments. As the planet most similar to the Earth in the solar system, Mars has become an important target object for human deep space exploration. The atmosphere of Mars is very thin, with great uncertainty, and weather such as strong winds and dust often occurs. In the process of spacecraft entry, descent and landing, the atmospheric entry period lasts the longest, the working conditions are the worst, the state of the spacecraft changes rapidly, and the requirements for deceleration performance are also high. As the "Curiosity" Mars rover successfully achieved a soft landing on the surface of Mars by using a closed-loop guidan...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a spacecraft intelligent predictive control atmosphere entry guidance method, to solve the problem that the high-precision guidance and the fast solution of the command are difficult to meet simultaneously in the current guidance technology

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