Electromagnetic Environment Measurement Procedure for a Moving Car

A dynamic electromagnetic environment such as automotive is difficult to be fully described due to its unpredictability. It is known that the interior of a car can behave as a reverberant space and should hence be characterized using statistical methods. The complexity of such environment in terms of both field magnitude and time variance is even higher considering that it is placed in a dynamic external environment, e.g. when the car is moving. The coupling of the external fields into the car chassis resembles the source stirring technique common for reverberation chambers. Following this principle, this paper discusses the effects of alterations in time, frequency, and space domains on the internal environment of a moving car, based on the ergodicity concept. These findings may help to understand the complexity of such an environment and find a conclusive way to characterize it in the future, especially for the needs of the risk-based electromagnetic compatibility.