【作者】 龚霖阳；

【导师】 陈科山；

【作者基本信息】 北京交通大学 ， 检测技术与自动化装置， 2012， 硕士

【摘要】 智能公交系统已成为智能交通运输系统的一个重要组成部分,各国都把智能公交系统作为智能交通运输领域重点投入应用的系统来开发,国内近年来也十分关注智能公交系统的开发。本论文在对国内外相关技术的深入研究后,结合短距离射频通信和GPRS无线传输技术,提出了基于站点信标的智能公交系统的技术方案研究。本文首先从智能公交系统的实现方式入手,设计了系统的总体方案和工作流程,并对系统硬件的主要组成模块进行了功能和接口类型的分析。其次根据系统方案的功能要求开发设计了包括射频通信模块和GPRS传输模块的车载设备和路侧设备的硬件电路。针对车辆定位误差问题,分析了里程表累积误差信标定点修正技术,研究了基于RSSI的校正基准点选定的原理,并进行了站点信标定位校正算法的设计,通过试验数据验证了该算法的可行性。然后根据各硬件设备在系统中承担的任务,设计开发了GPRS和短距离射频的通信软件,实现了自动定位、误差修正、无线数据传输、车辆实时监控等功能。最后,对所设计的各部分功能模块进行试验与测试,测试结果检验了系统设计的可行性。更多还原

【Abstract】 Advanced Public Transportation system (APTS) technology was a significant part of Intelligent Transportation System (ITS). The APTS system was developed as the important application system of ITS in many countries. In China, its development was especially concerned. This paper presents a novel technology of APTS system. It combines with the short radio frequency (RF) communication technology and General Packet Radio Service (GPRS) wireless transmission technology.In this paper, first overall scheme and flow of system was designed which based on the technical realization mode of APTS system. Function and interface types of main modules composing system hardware were analyzed. Secongly according to function requirement of APTS system, the hardware system was developed and designed. It was composed of two parts:On Board Unit (OBU) and Road Side Unit (RSU) which both were consisted of GPRS transmission module and short distance wireless positioning module of radio frequency. Aiming at vehicle location error, odometer cumulate error correction technique based on beaconing fixed-point was analyzed. The theory of correction reference point selected based on RSSI was also researched. And the beaconing positioning correction algorithm was designed. It was proved that this algorithm was feasible by the experimental data. Then according to the functions of hardware devices in the system, the communication software was designed and developed where GPRS and short distance RF were as transmission technology. The functions such as automatic positioning; error correction; wireless data transmission and vehicle real-time monitor were achieved.Finally, every function modules of APTS system were tested. And the feasibility of the designed APTS system was verified by the test results.更多还原