Input-limited finite time attitude cooperative tracking fault-tolerant control method

Abstract

The invention discloses an input-limited finite time attitude cooperative tracking fault-tolerant control method, and belongs to the technical field of multi-spacecraft formation flight. In order to reduce communication paths and avoid resource waste, a communication topological structure which has less communication traffic, comprises a directed spanning tree taking a navigator as a root node andonly has a part of followers capable of obtaining navigator information is adopted among spacecraft formation members. In order to enable a following spacecraft which cannot obtain pilot informationto obtain reference information, a distributed finite time state observer is designed to observe the pilot information. Considering communication bandwidth limitation, actuator fault and saturation, system uncertainty and external interference, based on a finite time algorithm, a redundant fault-tolerant algorithm, an adaptive algorithm and a saturation function, a finite time attitude cooperativetracking fault-tolerant control strategy is perfected, and the robustness and practicability of the control system are further improved.

Description

technical field [0001] The invention belongs to the technical field of multi-spacecraft formation flight, and in particular relates to a limited-time attitude cooperative tracking fault-tolerant control method with limited input. Background technique [0002] Spacecraft formation flight is a main mode for multiple spacecraft to work together, and spacecraft attitude coordination is an important basis for spacecraft formation flight. To achieve tasks that are difficult for a single spacecraft such as synthetic aperture imaging, gravity field measurement, three-dimensional imaging, satellite capture, space-based interferometry, and long-distance communication. One of the hotspots of research. [0003] With the continuous deepening of space exploration, the space tasks undertaken by spacecraft in orbit are becoming more and more diverse and complex. The time or coordination rate required for multi-spacecraft to complete attitude coordination has become an important indicator o...

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Problems solved by technology

[0004] At the same time, due to the long-term operation of the spacecraft in orbit in harsh space environments such as strong radiation and high and low temperature, various failures may occur. If the failures cannot be handled in time during the orbital operation, the attitude control performance will be obvious. decline or complete loss, resulting in the failure of the entire mission, resulting in huge economic losses

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