Telecommunications and Radio Engineering

ANALYSIS OF PULSED FIELDS REFLECTED FROM A LAYERED LOSSY MEDIUM USING ARTIFICIAL NEURAL NETWORK

ABSTRAKT

A solution is found to the problem in determining the thickness of a layered medium through the use of the pulsed e.m. field. The artificial neural network (ANN) is used in the time domain to treat analytically the pulsed field reflected from a layered medium whose electric characteristics are close to those of human shin. The normal incidence of a time-shaped plane wave in the Gaussian form of is discussed. The reflected e.m. field is calculated by the finite-difference time-domain (FDTD) method. Use is made of the amplitude value of a reflected-field electric component. As an example, the network is trained to determine the thickness of one of the layers. The consistency of such determination is examined in the presence of interferences, experimental errors and slight deviations of the medium's electric parameters.

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