Ould Isselmou, Yahya (2007) Geostatistical interpolation of radio-electric exposure levels. PhD thesis Géostatistique, GEOSC- Centre de Géosciences, ENSMP p.149.

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Abstract

Radioelectric norms give different limit values of the radioelectric exposure. Exposure levels

measured near radio and telecommunication antennas are very small compared to values

recommended by the “International Commission on Non-Ionizing Radiation Protection”. Today,

persons near radio transmitters are seeking for the evaluation of exposure levels and the probability

to exceed some threshold and not only the conformity to norms. Probabilistic framework with

geostatistical methods is proposed that permits this evaluation.

In this thesis we present an application of linear geostatistical methods, in particular the kriging

method, for the estimation of the radioelectric levels of exposure starting from the output of a

numerical model. The application of kriging with external drift to measurements obtained by a

dosimeter is presented in this thesis. In these case studies, the Cauchy variogram model shows a

good adequacy with the variability of the power density.

A final application aims to evaluate the probability with which the exposure can exceed a

determined threshold. We use two methods of non linear geostatistics, which require a Gaussian

random function framework.. The practical implementation of these methods involves a

transformation of the exposure to Gaussian values. A comparison between the probability of

threshold exceedance obtained by application of the two methods on measurements is presented.

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