Abstract :
Accurate modelling of the propagation modes arising from vegetation media depends, on the one hand, on the physical parameters specific to the tree, such as size, shape, orientation and moisture contents of leaves, branches and trunk. On the other hand, the parameters of the radio link associated with the operational frequency, directions of transmit and receive antennas, their heights, beamwidths and polarisation add extra complexity to the characteristics and understanding of the scattering modes from single trees. We describe the development of a novel method, which will enable accurate modelling of leaves, trunk and branches. The method is aimed at studying the propagation modes arising from interaction with single trees at 20 GHz, using the finite difference time domain (FDTD) technique. It is proposed as a means of accurately computing electromagnetic scattering by arbitrary-shaped relatively complex metal or dielectric objects excited by an external plane wave
Keywords :
dielectric bodies; electromagnetic wave scattering; finite difference time-domain analysis; microwave propagation; radar cross-sections; 20 GHz; FDTD; FDTD based model; SHF; antenna height; beamwidths; bistatic RCS prediction; branches; dielectric objects; electromagnetic scattering; external plane wave excitation; finite difference time domain; leaf moisture content; leaves; metal objects; operational frequency; polarisation; propagation modes modelling; radio link parameters; receive antenna direction; scattering modes; transmit antenna direction; tree orientation; tree parameters; tree shape; tree size; trunk; vegetation media;
