CRITERIA OF THE VARIATIONS SIGNIFICANCE IN THE SENSORS SIGNALS OF THE ELECTRONIC EQUIPMENT TOLERANCE CONTROL BUILT-IN SYSTEM

The built-in system for monitoring and diagnostics of electronic equipment is considered. The performance indicators of the electronic device are modeled by complex time functions of the monitored parameters that display the state of the equipment functional units. A complex criterion for estimating the significance of variations in the sensors signals of functional control points of a controlled object is proposed. The decision on the state of the object under control is based on the results of measurements of its output characteristics and is made on the basis of the combination of two criteria - level and informational. The estimate of the significance of the parameter level characterizes the magnitude of the emissions of the output signal and is constructed on the basis of the likelihood ratio in accordance with the criterion of the minimum probability of an erroneous solution. The informational criterion is based on the principle of the maximum of Jain's entropy and gives an estimate of the information amount obtained when measuring the output characteristic of a monitoring object. Estimates of the monitored signal variations significance for the distribution laws of random variables which most commonly used in the problems of electronic equipment reliability are obtained.

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