Comparative study between EMTR technique and a GA-based method for modeling EM radiation source in the Near Field

Abstract

This paper presents a comparative study between two different methods used in modeling electromagnetic transient disturbances of power electronic systems. The first method is the Electromagnetic Time Reversal (EMTR) technique based on time domain analysis. The second one is the frequency inverse method based on Genetic Algorithms (GA). The two methods are using the near field scanning technique. Moreover, both algorithms are established on the resolution of an inverse problem and they employ magnitude-only data. The obtained equivalent radiation models are compared with initial pattern for both simulation and experimental test cases. The frequency-time evaluation is discussed. The comparison between the two proposed methods shows that the EMTD method is more suitable for studying power electronics radiation and that it can provide an accurate equivalent model in a reduced time.

Time domain sources identification in the near field: comparison between electromagnetic time reversal and genetic algorithms-based methods

“…The GA-based method has shown good performances in the identification of radiating sources in both FD and TD [2,3,11,19]. Fig.…”

“…Theoretically, GA simulates the evolution in a population using a particular selection criterion in order to find an optimal solution. A GA procedure is carried out as follows: Coding: It is the genetic representation of each individual in the population (can be a potential solution). Fitness function: It reflects how close the solution is to the optimal solution of the problem. Genetic operators: Such as the crossover and the mutation, allowing the research field exploration by obtaining new individuals in the population from those existing. Genetic parameters: Such as the population size, the generations number, crossover and mutation probability. The GA‐based method has shown good performances in the identification of radiating sources in both FD and TD [2, 3, 11, 19]. Fig.…”

“…Moreover, experimental measurements have been carried out using a TD test bench. For validation purposes, a comparative study between TD EMTR-based method and a conventional FD optimisation method based on GA has been carried out in [19] using a mono turn coil. Based on FD magnetic field modelling, characterisation of transient disturbances has required an iterative process in order to cover the whole frequency spectrum of the measured radiated field.…”

Characterization of Radiating Sources in the Near Field Using EMTR Technique: A Parametric Study

“…In EMC studies, while measuring radiated emissions, the distance of scan is a very important parameter. Indeed, in the literature, researchers have investigated the NF scanning technique in order to obtain an accurate representation of the DUT [2][3][4][5][6][7][8][9]. NF measurement has interesting advantages in terms of cost, accuracy, and application range.…”

“…The EMTR-based method is based on a full time domain (TD) analysis. For validation purposes, in [9], a comparative study has been carried out between the proposed method and a conventional genetic algorithm based method. Indeed, EM inverse method is based on the identification of a set of magnetic equivalent dipoles in the near field region.…”