A Fault Diagnosis Method for Ship Integrated Navigation System Based on Information Fusion

Abstract

The invention discloses an information fusion based fault diagnosis method for a vessel integrated navigation system. A fault recognition framework of the vessel integrated navigation system is determined; basic probability assignment of faults is output by multiple groups of sensors and are taken as evidences for fault diagnosis; conflict coefficients, evidence support degrees, evidence certainty degrees, evidence decision-making degrees and evidence weight among the evidences are calculated; the evidences are subjected to weighting average processing according to the evidence weight, and weighted average evidences are obtained; the weighted average evidences are fused according to the conflict coefficient and an improved Dempster fusion rule, and an ultimate fusion result is output; the ultimate fusion result is judged according to the policy rule, and a diagnosis result is output. Conflicts among the evidences can be accurately measured, the evidences can be subjected to weighting average processing according to the evidence weight, influences of conflicting evidences on the fusion result can be reduced, the fusion rule can be improved through the conflict coefficient, and the reasonable fusion result can be obtained.

Description

technical field [0001] The invention belongs to the field of equipment fault diagnosis, in particular to an information fusion-based fault diagnosis method for a ship's integrated navigation system. Background technique [0002] With the development of high-tech navigation, it has become a necessary development trend to deploy integrated navigation systems on ships. In terms of performance or function, the performance of the integrated navigation system is more complete than that of a single navigation device. Even when working in an environment with relatively harsh conditions, the position provided by the integrated navigation system is relatively accurate, the accuracy is high, and the robustness is also strong. Just because the integrated navigation system has such powerful functions, once it fails, the consequences will be unimaginable. The emergence of fault diagnosis technology provides a new way to improve the reliability and navigation accuracy of integrated navig...

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