Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS1
Session:
Number:POS1-38
Three-dimensional FDTD Analysis of Radio Wave Propagation at Intersection Surrounded by Compound Walls in Residential Area for Inter-vehicle Communications Using 720MHz band
Kenji Taguchi, Ryosuke Aoyama, Suguru Imai, Tatsuya Kashiwa,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
The widespread use of automobiles has resulted in a correspondingly high number of car accidents, and this number shows no sign of any significant decline. Many accidents occur at poor-visibility intersections. To avoid such incidents, an inter-vehicle communication (IVC) system has been proposed. In Japan, with the changeover in terrestrial broadcasting from analog to digital broadcasting, part of 720 MHz band will be newly assigned to the IVC system. It is possible that this system can prevent car accidents at blind spots in such the intersections, because waves of 720MHz band have high diffraction effect relative to those of 5.8-5.9GHz band used in the dedicated short range communication system. Furthermore, it could potentially be adapted to prevent short-range emergency collisions. In Japanese residential areas, intersections are often surrounded by houses with compound walls that limit visibility at these intersections. We have previously investigated the basic impact of such compound walls on propagation characteristics of 720 MHz band at intersections in the two-dimensional space. However, in real life, the wall height and the ground may also influence these characteristics. In this paper, radio wave propagation characteristics at an intersection surrounded by compound walls are investigated for the IVC system using 720 MHz band. These characteristics in the three-dimensional space are obtained for the first time by using the finite-difference time-domain (FDTD) method. Specifically, we investigate the qualitative impact of wall thickness and height, the ground, and source locations on propagation loss. Furthermore, the power delay profile and power angle profile are analyzed to clarify the physical mechanism of radio wave propagation. These characteristics are important to design communication systems.