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Investigation of observational plate length and diffraction point for DRTM

After the Great East Japan earthquake, the radio communication networks have been more important than ever in the world and more sophisticated performance of the networks is required. To design and construct high performance radio communication network links, the field estimation is significantly important. We have developed and proposed discrete ray tracing method (DRTM), Uchida method that enables us to estimate propagation characteristics along land surface structure. However the method still requires a certain time to compute field intensities in case of long path or complicated land surface structure. We have studied to shorten computation time and to save computer memory by considering the discretisation rate of the terrain surface with equal interval size of linear piece wise strips. We have realised that intense sampling points are needed at the edge point like a mountain summit to estimate the field intensities in shadow areas following the summit. In this paper, we consider the discretisation rate at the mountain summit by checking accuracy of numerical results of electromagnetic (EM) wave analysis by DRTM and we compare the results with rigorous solutions given by the Bessel and Hankel functions.