2-DIMENSIONAL ACTIVE IMAGING OF CONDUCTING OBJECTS BURIED IN A DIELECTRIC HALF-SPACE

A two-dimensional quasi-exact active imaging method for detecting the conducting objects buried in a dielectric half-space is proposed. In t his imaging method, an image function which is a projection of buried object to an arbitrary direction, is introduced exactly by taking acco unt of the presence of the planar boundary. The image function is synt hesized from the scattering fields which are measured by moving a tran smitting antenna (a current source) and a receiving antenna (an observ ation point) simultaneously along the ground surface. The scattering f ield is generated by the physical optics current assumed on the surfac e of buried object. Because the effectiveness of physical optics appro ximation has been confirmed for this problem, this is a quasi-exact ac tive imaging method. The validity of this imaging method is confirmed by some numerical simulations and an experiment.