前车干扰对ETC系统传播损耗的影响  

Interference of the front vehicle in the propagation loss of ETC system

作　　者：李兵[1] 赵锋 许浩文 曾文波 何怡刚[1] Li bing;Zhao Feng;Xu Haowen;Zeng Wenbo;He Yigang(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电子测量与仪器学报》2019年第4期133-139,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金面上项目(51777050);国家重大科学仪器设备开发项目(2016YFF0102200);湖南省自然科学基金面上项目(2017JJ2080;2018JJ5029)资助

摘　　要：车载通信系统通过车-车、车-路通信将人、车、路及环境有机结合,提高了交通系统的安全和效率。电子不停车收费系统(ETC)作为车-路通信的典型应用,在国内外得到广泛运用。目前,单车道有障碍应用模式ETC道路通行效率较低,为提高车辆通行效率,出现了多车道自由流(MLFF)模式,多台车辆可同时进入同一收费区域,自前车可能干扰后车通信。通过射线跟踪技术和一致性绕射理论,讨论了MLFF模式中路侧单元(RSU)→轿车→轿车情形下的前车干扰路径传播损耗模型,其次在仿真环境下分析了RSU与车载标签单元(OBU)距离以及OBU与前车距离的变化对传播损耗的影响,最后进行了现场测试,测试结果表明,所提出的路径损耗模型是有效的。The vehicle communication system improving the safety and efficiency of the transportation system by combining people,vehicles,roads and environment through vehicle-vehicle and vehicle-road communication. The electronic toll collection( ETC) as a typical application of ITS is widely used in highway toll collection system in many countries. Now the traffic efficiency of single-lane barrier mode for ETC road is low,for improving vehicle traffic efficiency,a multi-lane free-flow( MLFF) mode occurs. Multiple vehicles can enter the same toll area at the same time,and the preceding vehicle may interfere with the after-vehicle communication. In this paper,it mainly discussed the propagation loss of the case that RSU→ cars→ cars based on ray-tracing and uniform theory of diffraction( UTD). Then,analyzed the propagation loss with the change of the distance between RSU and OBU and the distance between the front car and OBU for four kind of propagation loss models in simulation environment. The results of simulation and experiment are indicated that the validity of the propagation loss models it proposed.

关 键 词：前车干扰 传播损耗模型 ETC 射线追踪 一致性绕射理论 

分 类 号：TN92[电子电信—通信与信息系统] TP206.1[电子电信—信息与通信工程]