Diagnosability determining method of satellite control system based on transfer functions

Abstract

The invention discloses a diagnosability determining method of a satellite control system based on transfer functions. The method comprises the steps of: first, establishing a failure model of the satellite control system to obtain output transfer functions of failures; obtaining detectability conditions of various failures by judging whether the output transfer functions of failures are 0 or not through the failure transfer functions, and obtaining separability conditions of various failures by judging whether transfer functions corresponding to different failures are in linear correlation or not so as to obtain a diagnosability analyzing result of the satellite control system; and finally, calculating to obtain the failure detectability and the separability as well of the system failure detectability and the separability of a failure mode of the satellite control system by a diagnosability measurement calculation method. According to the diagnosability determining method of the satellite control system based on the transfer functions, detectability and separability judgment of the failure mode of the satellite control system are realized and the diagnosability of the satellite control system is measured.

Description

technical field [0001] The invention relates to a method for determining the diagnosability of a satellite control system, in particular to a method for determining the diagnosability of a satellite control system based on a transfer function, which belongs to the field of aerospace. Background technique [0002] At present, in order to improve the fault response capability of the satellite control system, scholars at home and abroad pay more attention to the research of fault diagnosis methods, while ignoring one of the basic problems-fault diagnosability analysis, that is, according to the current system configuration, it is judged whether the fault is Satisfying the diagnosability requirement, when it is not satisfied, no matter how advanced the fault diagnosis method is, it is of no avail. Researching fault diagnosability determination methods around the satellite control system can help designers understand whether some single-point faults or some faults that require sp...

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Problems solved by technology

[0003] Documents (a document is given here: 1.Steven X.Ding.Model-based Fault Diagnosis Techniques: Design Schemes, Algorithms and Tools.Springer.2008) discloses the fault diagnosability analysis method based on transfer function, insufficient The disadvantage is that the given method is only applicable to the open-loop system, and the feedback effect caused by the existence of the controller has not been considered. At the same time, this method is only studied for the general system. Compared with the satellite control system, this method lacks specific sex

For the satellite control system fault diagnosability determination method based on the transfer function provided by the present invention, there is no disclosed method with complete practical significance

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