基于符合性证据链的航电系统工程试验方法

Engineering test method for avionics system based on conformity evidence chain

为形成逻辑严密、可追溯的适航符合性验证资料,提出一种基于符合性证据链的航电系统工程试验方法,并对实现中的关键问题进行分析研究。以自动飞行控制系统的工程试验为例,设计与实现了基于自动飞行控制系统适航验证需求的验证平台。在验证方案设计中,针对复杂验证环境中部分参数不确定性描述问题,提出一种基于分类概率多场景分析的验证方案设计方法,基于适航验证需求,对飞行数据进行筛选,通过对筛选后的飞行数据进行统计特性分析、随机抽样与合并缩减,生成包含发生概率的确定性场景,描述验证环境中部分参数的不确定性。在验证数据分析中,针对多场景多参数条件下的适航符合性判断问题,提出基于加权Dempster-Shafer证据理论的适航符合性评估方法,以确定性场景发生概率为权重,进行证据融合,避免部分小概率场景对融合结果的干扰。基于实际飞行数据,自动飞行控制系统的自动飞行模式工程试验结果表明,所提方法有效可行。

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.