Analysis of field intensity distribution in inhomogeneous propagation environment based on two-ray model

Authors:
Junichi Honda;Kazunori Uchida;Masafumi Takematsu
Affiliations:
Surveillance and Communications Department, Electronic Navigation Research Institute, Cyofu, Japan;Department of Intelligent Information System Engineering, Fukuoka Institute of Technology, Fukuoka, Japan;Department of Intelligent Information System Engineering, Fukuoka Institute of Technology, Fukuoka, Japan
Venue:
Journal of Mobile Multimedia
Year:
2012

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Abstract

This paper is concerned with an analysis of field intensity distribution caused by sensor nodes located on inhomogeneous terrestrial surfaces. First, we introduce 1-ray and 2-ray models with two modification factors to estimate the field intensity distribution. One of the two factors is an amplitude modification (α) and the other is a distance order of propagation (β). By using the two factors, we can calculate field intensity distributions in complicated natural environment such as random rough surface. Then, we propose an estimation formula for analyzing electric fields in inhomogeneous propagation environments based on the conventional two models. Next we introduce an algorithm for radio communication distance based on the 1-ray and 2-ray models. In the numerical examples, we show the field intensity distribution caused by sensor nodes located randomly on inhomogeneous terrestrial surfaces, using 2-ray models. Finally, we discuss how many sensor nodes are needed to cover the field area in order to construct networks.