Relevance analysis of aircraft equipment electromagnetic compatibility

System vulnerability is a theory that intends to explain, analyze chain fault. This paper analyzes the electromagnetic compatibility (EMC) vulnerability by the equipment topology. First, this paper delimits the concept of the EMC vulnerability system, the vulnerability source, the degree of vulnerability and so on. Second, this paper located the source of vulnerability equipment in some aircraft systems pre-design just by analyzing the vulnerability and network topology. And then, through the EMC network topology and analytic hierarchy process (AHP), this paper analyzes the relevance failure probability between airborne equipment. The algorithm could predict EMC problem by analyzing the antenna coupling, safety margin and so on. The algorithm can offered an important technical support for resolving the acute EMC problem.