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Multi-component georadar data and lateral resolution - Achaeological Case study
by
Luciana Orlando
University of Rome 'La Sapienza'
The georadar method is based on the propagation of electromagnetic waves and usually of the electromagnetic field generated, only one electrical component with parallel-broadside antenna setting is acquired. In the case we have three dimensional reflectors, i.e. in archaeological study, the radar data can be directly depending on the directionality of profiles respect to the geometry of reflector. This can produce a decrease on the quality of images of structures.
Moreover to reduce the time consuming task, the continuous mode acquisition is preferred to the steep mode. The continuous mode has the vantage to be fast and to more data in the time unit but has the disadvantage to acquire the data with a irregular spatial sampling. When processing and imaging procedure needs regularly spaced traces, the data are re-sampling regularly in space or wave number domains. This can leads to smeared geometries of the scattering objects producing a decrease of the effective lateral resolution of georadar image. Both this kind of smearing cannot be recovered by migration algorithm.
Here to test the effective amount of smearing produced acquiring the data in continuous mode and sampling only a component of E field scalar data with ‘pseudoscalar’ one are compared. Data acquired with parallel-broadside antenna in x and y directions are considered. Moreover re-sampling data using binomial horizontal filter and binning and stacking re-sampling are tested.
The data used are acquired in an archaeological site with 200 MHz center frequency antennas. Profiles 0.5 m spaced in the x direction and 1 m spaced in y direction with parallel-broadside antenna setting are available.
Date received: June 18, 2004
Copyright © 2004 by the author(s). The author(s) of this document and the organizers of the conference have granted their consent to include this abstract in Atlas Conferences Inc. Document # caon-02.