| Citation: | ZHONG L L，ZHANG Z X，CHEN Y G. Engineering test method for avionics system based on conformity evidence chain[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（5）：1500-1511 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0643
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In order to form logical and traceable airworthiness conformity materials, an engineering test method for an avionics system based on a conformity evidence chain is proposed, and the key problems in the implementation are analyzed and studied. A validation platform based on the specifications of an automatic flight control system’s airworthiness verification is built and implemented, using the engineering test of the system as an example. In the validation scheme, for the problem of describing the uncertainty of some parameters under complex validation scenarios, an authentication scheme based on classification probability multi-scene analysis is proposed. Based on the requirements of airworthiness verification, the flight data is filtered. To characterize the uncertainty of specific parameters under the validation scenario, a deterministic scenario with the occurrence probability is constructed by applying statistical characteristic analysis, random sampling, and merge reduction to the filtered flight data. A method for analyzing airworthiness compliance based on weighted Dempster-Shafer evidence theory is proposed, with the goal of addressing the issue of airworthiness conformity judgment in multi-scenario and multi-parameter conditions through validation data analysis. The occurrence probability of deterministic scenes is taken as the weight to conduct evidence fusion, and the interference of some small probability scenes on the fusion results is avoided. The suggested approach is practical and efficient, as demonstrated by the outcomes of the automatic flight mode engineering test conducted utilizing real flight data for the automatic flight control system.
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