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The work which we present takes place within the framework of mission SMOS ofthe ESA which will consist to send a radiometer (1.4 GHz) in space. The goal ofthe research which we propose is the improvement of the comprehension of theeffects of structure soil and litter. The effects of the litter andheterogeneities of the ground are probably important but still are veryignored. So we developed an experimental approach in laboratory and in situ.That makes it possible to take measurements for various configurations(frequency, temporal, polarization, incidence, Bi-statics, Brewster effect...)and in term of surface conditions(homogeneous or heterogeneous ground, more orless wet, presence of litter...). Measurements at the laboratory with waveguideenabled us to characterize the various components of the geological structure(ground, rocks) and to check the model of Dobson usually used.

Caract\'erisation \'electromagn\'etique de milieux h\'et\'erog\`enes  naturels - Application \`a la mesure de l'humidit\'e du sol par radiom\'etrie  micro-onde