Complexity assessment method of electromagnetic environment for avionic systems

For the difficulty of quantitativeassessment of a battlefield electromagnetic environment, a method to evaluate the complexity of electromagnetic environments in avionic systems is proposed in this paper. Through the evaluation of the operating efficiency of each subsystem and devicewhich constitute the avionic system, the complexity of the electromagnetic environment in theavionic system is determined. The sensitivity test data of the subsystems and equipment are regarded as the evaluation object; thecomprehensivemultilevel fuzzy evaluation method is used inthe evaluation process; the Dempster-Shafer evidence theory is applied to deal with the assessment data, which avoids the impact of "uncertainty" factors on the results of the assessment, and makes the results more accurate and credible. The determination of weight is based on the "terminology for electromagnetic interference and electromagnetic compatibility" of GJB 72A-2002. In dealing with uncertain data, the result is improved by 15.7% as compared with previous methods. This method provides a new way to evaluate the complexity of abattlefield electromagnetic environment.