FORWARD MODELING OF THE INTERNAL LAYERS IN RADIO ECHO SOUNDING USING ELECTRICAL AND DENSITY-MEASUREMENTS FROM ICE CORES

The measured density and conductivity of a 181 m ice core are used to calculate a profile of complex reflection coefficients. It is confirme d that the amplitude reflection coefficients due to the conductivity v ariations are negligible in comparison to the amplitude reflection coe fficients due to the density variations. Using the magnitudes of these reflection coefficients we obtain a profile of the expected power bei ng returned to the surface. The modeled power return is compared with the results of a short pulse electromagnetic reflection survey near th e drill site. We also convolve the profile of complex reflection coeff icients with a depth invariant input wavelet to produce a synthetic ra dargram for the top part of the ice sheet. The phase change given to w avelets reflecting from the conductivity variations has a negligible e ffect on the synthetic radargram. Using this simple model we are unabl e to match the positions of the internal layers in the synthetic radar gram with those in the reflection survey.