A Spacecraft Adaptive Fault-Tolerant Attitude Tracking Control Method with Specified Tracking Performance

Abstract

The invention discloses a spacecraft adaptive fault-tolerant attitude tracking control method with specified tracking performance. The method comprises steps: a kinematic model and a dynamic model ofthe spacecraft are built based on a certain amount of external disturbance on the spacecraft; based on the dynamic model of the spacecraft and based on unknown system fault on a spacecraft executor, an unknown actuator fault system model is built; based on the unknown actuator fault system model, a conversion error and a performance function are designed, and thus, the tracking error of the spacecrafts tends to be arbitrarily small minimum residual set under the specified tracking performance and the maximum overshoot; and the effects of the fault are compensated by estimating the boundary offault uncertainty, an adaptive fault-tolerant controller is designed, and the system tends to asymptotic stability. The method of the invention realizes high-precision system attitude tracking controlon the premise of ensuring the robustness of the system.

Description

technical field [0001] The invention belongs to the technical field of spacecraft control, and relates to a spacecraft adaptive fault-tolerant attitude tracking control method with specified tracking performance, which is mainly applied to the attitude tracking control of spacecraft. Background technique [0002] Attitude tracking control of spacecraft is a very important issue for many space missions, such as earth observation, near space monitoring, and space on-orbit service. In the past research, scholars have adopted various control schemes, such as high-order sliding mode control, finite time control, and robust backstepping control. But the core idea of ​​these methods is to have actuators that are functioning normally, and each actuator has a rigid body spacecraft that responds perfectly to a given control signal. In fact, although scientific researchers have taken various measures to improve the reliability of spacecraft, in harsh space environments, such as spacec...

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Problems solved by technology

In fact, although scientific researchers have taken various measures to improve the reliability of spacecraft, in harsh space environments, such as spacecraft actuators exposed to weightlessness, low temperature, and strong radiation for a long time, Coupled with the aging and wear of its own components, it is possible to cause the actuator to fail, and it is more likely to cause the paralysis of the entire control system, resulting in huge economic losses and safety problems.

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