- journal_title：Geophysics
- Contributor：Karl J. Ellefsen ; Delphine Croizé ; Aldo T. Mazzella ; Jason R. McKenna
- Publisher：Society of Exploration Geophysicists
- Date：2009-
- Format：text/html
- Language：en
- Identifier：10.1190/1.3092776
- journal_abbrev：Geophysics
- issn：0016-8033
- volume：74
- issue：3
- firstpage：J13
- section：GROUND-PENETRATING RADAR
Green's functions for radar waves propagating in heterogeneous 2.5D media might be calculated in the frequency domain using a hybrid method. The model is defined in the Cartesian coordinate system, and its electromagnetic properties might vary in the x- and z-directions, but not in the y-direction. Wave propagation in the x- and z-directions is simulated with the finite-difference method, and wave propagation in the y-direction is simulated with an analytic function. The absorbing boundaries on the finite-difference grid are perfectly matched layers that have been modified to make them compatible with the hybrid method. The accuracy of these numerical Green's functions is assessed by comparing them with independently calculated Green's functions. For a homogeneous model, the magnitude errors range from 
through 0.44%, and the phase errors range from 
through 4.86%. For a layered model, the magnitude errors range from 
through 2.06%, and the phase errors range from 
through 2.73%. These numerical Green's functions might be used for forward modeling and full waveform inversion.