Near-field microwave sounding of nonlinear subsurface targets
A new method of the near-field sounding of subsurface inhomogeneities with nonlinear response on harmonics of the probing signal is propoded. This method is based on the solving the near-field inverse scattering problem. For the retrieval of the subsurface structure of complex permittivity and nonlinear susceptibility we used data of multifrequency or pulse measurements obtained with the scanning transceiver system operating in the bistatic configurationd. In this paper, results of sounding with the pulse mono-sinus signal of silicon targets in the sand medium are demonstrated.