Method for adaptively identifying built-in test BIT false alarm of complex electronic system

Abstract

According to the method for adaptively recognizing the built-in test BIT false alarm of the complex electronic system, the BIT state can be accurately recognized, and the false alarm can be filtered out. According to the technical scheme, the method comprises the following steps: grouping fault features of complexity, hierarchy, correlation and uncertainty of an avionics system according to passing / non-passing test results; the system-level BIT false alarm filtering algorithm software judges a false alarm based on a maximum likelihood rule, and if a certain fault indication in a suspected false alarm set is inconsistent with two or more'passing test ', the fault indication is judged as the false alarm; if a certain passing test in the passing test set is inconsistent with a plurality of fault indications, determining that the passing test is missing detection; and processing residual suspected false alarms according to test confidence priori information, and performing judgment processing based on the test confidence for the condition that two test results are inconsistent: the test result with low confidence is false and the test result with high confidence is true, and sending the results into a false alarm or leak detection set.

Description

technical field [0001] The present invention relates to a method for self-adaptively identifying BIT (Built-in-Test) false alarms in complex electronic systems by using test correlation analysis. Background technique [0002] With the rapid development of modern avionics technology and the rapid improvement of functional requirements of avionics systems, the design of avionics systems continues to develop in the direction of integration and integration, and the complexity of modern avionics systems continues to expand. Difficulty increases, such as longer test time, increased maintenance and support costs, etc. For example, the test time becomes longer and the cost of failure increases. In order to simplify the design, BIT designers often need to make some assumptions. Because it is difficult to fully grasp the impact of the BIT working environment and actual working characteristics on the BIT, these assumptions may not be completely in line with the actual situation, resul...

AI Technical Summary

Problems solved by technology

①The threshold value is unreasonable

In fact, during the development of BIT, due to the impact of the harsh aviation airborne environment, the false alarm problem of the BIT system has always been a major problem plaguing the aviation system.

The main reason for the BIT false alarm is that the module BIT circuit itself is faulty, or there are defects in the BIT design, including: 1) The selection of the BIT test item itself is unreasonable

For example, the parameter selection for the internal test of the radio frequency signal is improper, some parameter tests are difficult in itself, and the accuracy of the internal test is even more difficult to meet the requirements, and it is easily affected by the disturbance of environmental factors. In this case, it is selected as the BIT Test items can easily lead to false alarms;

[0004] 2) The test tolerance selection of BIT is unreasonable

When the test tolerance is determined, various actual conditions of the real system and the accuracy of the in-machine test are not considered, and false alarms are prone to occur when the system is running;

[0005] 3) Failure to take effective BIT false alarm suppression measures

[0009] 1) The BIT design level of each module manufacturer is uneven, and there is a lack of effective verification methods for BIT anti-false alarm measures. The effect of BIT anti-false alarm measures shown in engineering practice is not satisfactory;

[0010] 2) The fault performance of complex electronic systems in the complex electromagnetic environment of the aircraft has a certain degree of randomness, and module manufacturers lack effective data accumulation for the cognition of fault laws, which makes it difficult to set reasonable BIT fault thresholds, and BIT false alarms inevitably exist

Therefore, the current method of relying on underlying modules to filter BIT false alarms inevitably has certain limitations.

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