系统级电磁敏感性综合评估模型研究

Comprehensive evaluation model of system-level electromagnetic susceptibility

针对系统级电磁敏感性建立综合评估模型,提出3个描述参数,分别为误差阈值、系统失效概率和告警时间。首先,通过分析电磁干扰造成系统相关性能指标产生误差的原理,进行误差建模和阈值求解,实现了电磁敏感性的量化预测;其次,在此误差阈值条件下,利用故障树分析系统失效概率,建立失效概率模型;最后,在系统失效的前提下建立了系统告警时间模型。以某多点定位接收系统为例进行仿真验证,结果表明,该模型预测得到的干扰阈值与实测数据的平均误差在工程允许范围内。与经典的Volterra行为级模型对比,该综合评估模型不仅可以达到敏感性阈值预测的效果,还能从理论上评估在当前环境下系统的失效概率以及失效时间的数学期望。

A system-level electromagnetic susceptibility comprehensive evaluation model is established,and three description parameters including error threshold,system failure probability and alarm time are proposed.First,by analyzing the principle of electromagnetic interference caused errors of system-related performance indicators,error modeling and threshold solving are carried out to realize the quantitative prediction of electromagnetic susceptibility.Then,under this error threshold condition,the fault tree is applied to analyze the system failure probability and establish the failure probability model.Finally,the system alarm time model is established under the premise of system failure.Taking a multi-point positioning receiving system as an example,the experimental simulation verification results show that the average error between the interference threshold predicted by the proposed model and the measured data is within the engineering allowable range.Compared with the classic Volterra behavioral model,the proposed comprehensive evaluation model can not only achieve the effect of predict sensitivity threshold,but also theoretically evaluate the probability of system failure and the mathematical expectation of failure time in the current environment.