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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 |
Description
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.