Abstract
To improve the accuracy of testability modeling, the paper proposes an extended testability modeling method based on FTE (the enable relationship between faults and tests). The characteristics of FTE are analyzed, and corresponding mathematical definition is given. Besides, the graphic modeling method of the extended model of testability considering FTE is designed, and the acquisition method of the diagnosis matrixes considering FTE is also proposed. At last, using the traditional modeling method and an extended testability modeling method based on the enable relationship between faults and tests to model of the laser inertial navigation system.
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