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Electronic devices exposed to high level electromagnetic interference with certain amplitude will fail with a certain probability. Knowing this failure probability is essential when a system is being designed to withstand intentional electromagnetic interference (IEMI). Based on this knowledge additional redundancy can be included in order to reduce the risk. In previous investigations [1] failure probability was analyzed for the case where a device was illuminated from one direction only. If the device is illuminated from other (random) directions, then the failure probability will change. In this contribution it is discussed how the failure probability determined for one direction can be extended in order to include a random angle of incidence of the interference. The main focus of this contribution is on failure probability caused by pulsed wideband signals. However, the approach presented here can also be extended to narrowband signals.

Abstract. The complexity of modern systems on the one hand and the rising threat of intentional electromagnetic interference (IEMI) on the other hand increase the necessity for systematical risk analysis. Most of the problems can not be treated deterministically since slight changes in the configuration (source, position, polarization, ...) can dramatically change the outcome of an event. For that purpose, methods known from probabilistic risk analysis can be applied. One of the most common approaches is the fault tree analysis (FTA). The FTA is used to determine the system failure probability and also the main contributors to its failure. In this paper the fault tree analysis is introduced and a possible application of that method is shown using a small computer network as an example. The constraints of this methods are explained and conclusions for further research are drawn.