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Near-Field imaging : a study of the SNR issue
Applied Math| Speaker: | Gregoire Dervaux, Stanford University |
| Location: | 693 Kerr |
| Start time: | Fri, May 21 2004, 4:10PM |
We investigate the use of near-field data collected by GPR for imaging the surface displacement induced by the propagation of a seismic wave used to detect the presence of landmines underground. The information carried by evanescent waves can be used to achieve subwavelength resolution, but since they decay rapidly this information is easily corrupted by noise. Using a simple propagating model for the scalar wave equation, the effect of noise is analyzed theoritically and is illustrated by numerical examples. The interest of the use of broadband signals for enhacing the resolution while reducing the level of noise is shown.