We study the propagation of electromagnetic fields in forest media in a frequency band between 100 and 300 MHz. We develop an exact coherent model in order to compute the electromagnetic field of a received wave after multiple scattering from the elements of the medium, in and outside the forest. We propose simplifications for the model of the forest and approximations for the electromagnetic method to reduce the computing time. We use and simulate a DORT based method to detect and locate a hidden target in the medium. We develop this method to adapt it to a real configuration and we apply it to measurements in anechoic chamber.Index Terms-Decomposition of time-reversal operator (DORT), detection, experimental results, forest model, multiple scattering.

Propagation of electromagnetic waves in forest medium is examined in a frequency band of 100 to 300MHz. We propose a simplified model to represent the medium in this frequency band. We have developed an exact method to calculate the electromagnetic field received inside or outside the forest medium when the transmitter is placed among or in front of the trees. Comparisons between simulation and measurement made in anechoic chamber are done to test and validate the theoretical method.

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