Browsing by Author "Oğuz, U."
Now showing items 1-11 of 11
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Application of signal-processing techniques to dipole excitations in the finite-difference time-domain method
(Taylor & Francis, 2002)The applications of discrete-time signal-processing techniques, such as windowing and filtering for the purpose of implementing accurate excitation schemes in the finite-difference time-domain (FDTD) method are demonstrated. ... -
An efficient and accurate technique for the incident-wave excitations in the FDTD method
(Institute of Electrical and Electronics Engineers, 1998-06)An efficient technique to improve the accuracy of the finite-difference time-domain (FDTD) solutions employing incident-wave excitations is developed. In the separate-field formulation of the FDTD method, any incident wave ... -
Frequency responses of ground-penetrating radars operating over highly lossy grounds
(IEEE, 2002)The finite-difference time-domain (FDTD) method is used to investigate the effects of highly lossy grounds and the frequency-band selection on ground-penetrating-radar (GPR) signals. The ground is modeled as a heterogeneous ... -
Interpolation techniques to improve the accuracy of the plane wave excitations in the finite difference time domain method
(Wiley-Blackwell Publishing, Inc., 1997-11)The importance of matching the phase velocity of the incident plane wave to the numerical phase velocity imposed by the numerical dispersion of the three-dimensional (3-D) finite difference time domain (FDTD) grid is ... -
Modeling of ground-penetrating-radar antennas with shields and simulated absorbers
(IEEE, 2001)A three-dimensional (3-D) finite-difference time domain (FDTD) scheme is employed to simulate ground-penetrating radars. Conducting shield walls and absorbers are used to reduce the direct coupling to the receiver. Perfectly ... -
Optimization of the transmitter-receiver separation in the ground-penetrating radar
(IEEE, 2003-03)The finite-difference time-domain method is applied to simulate three-dimensional subsurface-scattering problems, involving a ground-penetrating-radar (GPR) model consisting of two transmitters and a receiver. The receiving ... -
Reducing the dispersion errors of the finite-difference time-domain method for multifrequency plane-wave excitations
(Taylor & Francis, 2003)We demonstrate the applications of discrete-time signal-processing (SP) techniques for the purpose of generating accurate plane waves in the finite-difference time-domain (FDTD) method. The SP techniques are used either ... -
Simulations of ground-penetrating radars over lossy and heterogeneous grounds
(IEEE, 2001)The versatility of the three-dimensional (3-D) finite-difference time-domain (FDTD) method to model arbitrarily inhomogeneous geometries is exploited to simulate realistic groundpenetrating radar (GPR) scenarios for the ... -
Three-dimensional FDTD modeling of a ground-penetrating radar
(IEEE, 2000)The finite-difference time-domain (FDTD) method is used to simulate three-dimensional (3-D) geometries of realistic ground-penetrating radar (GPR) scenarios. The radar unit is modeled with two transmitters and a receiver ... -
Transmitter-receiver-transmitter configurations of ground-penetrating radar
(Wiley-Blackwell Publishing, Inc., 2002)Three-dimensional ground-penetrating radar (GPR) geometries are simulated using the finite difference time domain (FDTD) method. The GPR is modeled with a receiver and two transmitters with arbitrary polarizations in order ... -
Transmitter-receiver-transmitter-configured ground-penetrating radars over randomly heterogeneous ground models
(Wiley-Blackwell Publishing, Inc., 2002)Ground-penetrating radar (GPR) problems are simulated using the finite-difference time-domain (FDTD) method. The GPR model is configured with arbitrarily polarized three antennas, two of which are transmitting antennas fed ...
