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Fukuoka tower plays an important role as master stations for several terrestrial digital broadcasting systems in Fukuoka area, which are going to completely replace the conventional analog broadcasting systems in 2011. The input power of the digital broadcasting system is reduced about one tenth of the old analog system, but the new system needs many relay stations to maintain high quality of services...
This paper is concerned with an approximation for diffraction function composed of a complex type of Fresnel function. The diffraction function is often used when we analyze the electromagnetic diffraction problems by using the discrete ray tracing method (DRTM). In this paper we introduce an approximate expression for the diffraction function in the form of simplified polynomial series resulting...
This paper is concerned with an analysis of the back scattering of an electromagnetic wave by a target moving along just above a random rough surface such as desert, hilly terrain, sea surface and so on. First we introduce the discrete ray tracing method (DRTM) for the field analysis of back scattering. Second we investigate the effect of clutter due to back scattering from the random rough surface...
An modified estimation algorithm for radio communication distance along random rough surfaces (RRS) is proposed in this paper. RRSs are generated by the convolution method, and its density functions are selected Gaussian, n-th order power law and exponential spectrum. First, electromagnetic fields are calculated numerically by using the Discrete Ray-Tracing Method (DRTM). Next, the conventional estimation...
This paper is concerned with the estimation of radio communication distance for wireless sensor networks when both the transmitters and receivers are arbitrarily distributed on a random rough surface such as desert, vegetation ground, sea surface and so on. First, we simulate electromagnetic wave propagation along the rough surface by using the discrete ray tracing method (DRTM). Second, we determine...
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