Diagnostic quantification method with consideration of incomplete failure of spacecraft control system

Abstract

The present invention discloses a diagnostic quantification method with the consideration of a incomplete failure of a spacecraft control system. A diagnostic quantification problem is transformed into a multivariate distribution similarity judgment problem in mathematical statistics, and an equivalent space model of the incomplete failure is obtained. Then concrete judgment criteria of the detectability and isolability of the incomplete failure are given. Finally, according to the judgment criteria, a diagnostic quantification index of the incomplete failure is proposed by using a Bhattacharyya distance, and an analysis result is obtained based on the diagnostic quantification index. The influence of system uncertainty in spacecraft control system on-orbit actual work is considered, according to the obtained result, a designer can conveniently understand weak links of the system, the guide of the design of a diagnosis algorithm and system configuration is facilitated, thus the fault diagnosis ability of the spacecraft control system can be improved to the maximum at a ground design stage, and finally a target of improving the system overall comprehensive design ability is achieved.

Description

technical field [0001] The invention belongs to the technical field of spacecraft control, and in particular relates to a diagnosability quantification method considering non-complete failure faults of a spacecraft control system. Background technique [0002] Due to the complexity of the spacecraft structure and the inevitable impact of the space environment (including: high and low temperature differences, electromagnetic interference, space particle radiation, etc.), the reliability of each subsystem and component will be reduced, which is easy to induce failure, and the failure occurs Difficult to repair afterwards. Compared with other subsystems, due to the complex working mode of the spacecraft control system, the probability of failure increases sharply; at the same time, due to the importance of undertaking tasks, once a failure occurs, it will cause great harm. [0003] Due to the seriousness of the problems caused by the failure of the spacecraft control system an...

AI Technical Summary

Problems solved by technology

[0012] The technical problem of the present invention is to overcome the deficiencies of the prior art, provide a diagnosable quantification method considering the non-complete failure of the spacecraft control system, and overcome the inability of the existing method to give quantitative results and the influence of uncertainty , cannot be applied to incomplete failure faults and other deficiencies

Images