Multi-fault diagnosis method of spacecraft attitude control system

Abstract

The invention provides a multi-fault diagnosis method of a spacecraft attitude control system. The multi-fault diagnosis method comprises the steps: establishing a spacecraft attitude dynamic model and an attitude kinematics model; establishing a spacecraft augmented attitude dynamics model and an augmented attitude kinematics model based on the above models; designing an RBF neural network interference observer based on the augmented attitude dynamics model and the augmented attitude kinematics model, and estimating an interference value in the system; designing a robust fault detection observer, calculating a residual evaluation value, and selecting a fault detection threshold; according to the residual evaluation value and a fault detection threshold value, determining fault occurrenceparts comprising an actuator, a gyroscope, an attitude sensor or a plurality of parts; designing an RBF neural network fault isolation observer, reconstructing actuator faults, gyroscope faults and attitude sensor faults on the three axes, and selecting a fault isolation threshold; and finally determining a specific part with a fault according to the reconstructed fault value and the fault isolation threshold, thereby finishing multi-fault diagnosis.

Description

technical field [0001] The invention relates to the technical field of spacecraft fault diagnosis, in particular to a multi-fault diagnosis method for a spacecraft attitude control system based on a radial basis function (RBF) neural network observer. Background technique [0002] The attitude control system is a very important subsystem of the spacecraft, which is composed of many components. Whether the spacecraft attitude control system can work normally is often related to the success or failure of the entire space mission. Because the operating environment of the spacecraft in orbit is very complex and harsh, the key components of the attitude control system (reaction flywheel actuator, rate gyroscope, attitude sensor) will inevitably have various failures. The failure of the attitude control system will not only affect the on-orbit mission of the spacecraft, but may even cause casualties and economic losses. Therefore, safe and reliable fault diagnosis methods for spa...

AI Technical Summary

Problems solved by technology

These interference factors will make the system modeling inaccurate, which will lead to a decrease in the accuracy of fault diagnosis

Especially for small faults, the existence of interference will make it difficult to detect small faults

If a small fault cannot be detected in time and accurately, it will gradually evolve into a more serious fault, causing unpredictable losses or casualties

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