Information entropy as an identifier in rock mass structure determination using low-frequency radars

The procedure of revealing water-saturated areas near underground openings by the data of radars with resistive-loaded antennas is developed. The key identifying parameter (attribute) of the procedure is the information entropy showing specific character of function of distribution of radar trace amplitudes. It becomes possible to distinguish anomalies in the profiles using the attribute after amplitude equalization. The procedure of processing of traces is described and exemplified, and the reasons of the entropy parameter efficiency are explained. For the comparison, the author considers alternative identifying parameters that appear less efficient as against the entropy attribute either for their weak capability to reveal anomalous sections in profiles or for the low interference immunity.