Method for Reduction of Field Computation Time for Discrete Ray Tracing Method

Masafumi TAKEMATSU  Junichi HONDA  Yuki KIMURA  Kazunori UCHIDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.3   pp.198-206
Publication Date: 2014/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.198
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
Keyword: 
propagation characteristics,  Discrete Ray Tracing Method,  reduction of computation time,  ray searching,  approximate Fresnel function,  diffraction,  

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Summary: 
This paper is concerned with a method to reduce the computation time of the Discrete Ray Tracing Method (DRTM) which was proposed to numerically analyze electromagnetic fields above Random Rough Surfaces (RRSs). The essence of DRTM is firstly to search rays between source and receiver and secondly to compute electric fields based on the traced rays. In the DRTM, the method discretizes not only RRSs but also ray tracing procedure. In order to reduce computation time for ray searching, the authors propose to modify the conventional algorithm discretizing RRSs with equal intervals to a new one which discretizes them with unequal intervals according to their profiles. The authors also use an approximation of Fresnel function which enables us to reduce field computation time. The authors discuss the reduction rate for computation time of the DRTM from the numerical view points of ray searching and field computation. Finally, this paper shows how much computation time is reduced by the new method.