Experimental Determination of Propagation Paths for the ETC System--Equipment Development and Field Test--

Katsuyuki HANEDA  Jun-ichi TAKADA  Takeo IWATA  Yoshitaka WAKINAKA  Takeshi KUNISHIMA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E87-A   No.11   pp.3008-3015
Publication Date: 2004/11/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Intelligent Transport System
ETC,  DSRC,  propagation,  short range wireless communication,  measurement system,  path determination,  3-D unitary ESPRIT,  SAGE algorithm,  

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Electronic Toll Collection (ETC), an application of Dedicated Short Range Wireless Communication (DSRC), had suffered from wrong operations due to multipath problems. To solve this problem, we proposed to apply a simple configured path determination scheme for the ETC system. The system consists of a vector network analyzer, low-noise amplifier, and X-Y positioner and achieves an automatic measurement of the spatial transfer function with emphasis on accurate measurement and reproducibility. For the reliable identification of the propagating paths, 3-D Unitary ESPRIT and SAGE algorithms were employed. Having developed the system, field experiments at the toll gate of the highway was carried out. In the measurements, we could determine many propagation paths so that the dominant propagation phenomena at the toll gate was identified. They included a ground-canopy twice reflected wave, which was a potential path that caused wrong operation. Consequently, their reflection coefficients and polarization characteristics were investigated. From the results, applicability of the path determination system for short range on-site measurement was confirmed.