tailieunhanh - Báo cáo hóa học: "Research Article Real-Time Propagation Measurement System and Scattering Object Identification by 3D Visualization by Using VRML for ETC System"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Real-Time Propagation Measurement System and Scattering Object Identification by 3D Visualization by Using VRML for ETC System | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 131576 11 pages doi 2009 131576 Research Article Real-Time Propagation Measurement System and Scattering Object Identification by 3D Visualization by Using VRML for ETC System Minseok Kim 1 Jun-ichi Takada 1 Tetsuo Ando 2 and Ryuji Soma2 1 Graduate School of Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan 2Nippon Expressway Research Institute Company Limited 1-4-1 Tadao Machida-shi Tokyo 194-8508 Japan Correspondence should be addressed to Minseok Kim mskim@ Received 25 April 2008 Accepted 27 September 2008 Recommended by Eylem Ekici In the early deployment of electric toll collecting ETC system multipath interference has caused the malfunction of the system. Therefore radio absorbers are installed in the toll gate to suppress the scattering effects. This paper presents a novel radio propagation measurement system using the beamforming with 8-elmenet antenna array to examine the power intensity distribution of the ETC gate in real time without closing the toll gates that are already open for traffic. In addition an identification method of the individual scattering objects with 3D visualization by using virtual reality modeling language will be proposed and the validity is also demonstrated by applying to the measurement data. Copyright 2009 Minseok Kim et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction In Japan electric toll collecting ETC system in the highway an application of dedicated short range wireless communication DSRC GHz interactive radio communication has been introduced since 2001 and it is currently installed in above 70 of the toll gates. ETC services started in Japan with the following aims to alleviate traffic congestion .

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