Multipath modelling for terrestrial VHF radio direction finding (U) / by William Read.: DR52-17/77-1996E-PDF

"This report details the development of computer models to investigate and explain the effects of multipath on VHF radio direction finding (DF). The motivation for this development was to help explain the large and small scale multipath effects which occur for changes in transmitter and receiver position, or for changes in frequency. This is particularly important when analyzing the capabilities of current wide and narrow band DF methods, or when developing new DF methods. The development of the computer models is based on representing the terrain and vegetation affecting the signal by a large number of small (relative to the signal wavelength) isotropic reradiators. Polarization effects are not accounted for. Although this kind of approach can quickly become a computationally daunting task, a number of simplifications are introduced which greatly simplify the calculations. Two examples have been included illustrating the use of the proposed approach in the analysis and modelling of real world measurements"--Abstract, page iii.

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