【作者】 孙先锋；

【导师】 陈星；

【作者基本信息】 大连理工大学 ， 机械电子工程， 2005， 硕士

【摘要】 智能交通系统是当前国际道路交通和运输科技发展的前沿。作为智能交通系统重要组成部分的车载监控系统成为研究热点。 本文详细分析了当前车载监控系统常用通信方式(短消息SMS通信)的优缺点,及通用分组无线业务GPRS的新特性,提出了基于GPRS/SMS通信的车载监控系统。分析了GPRS网络实现原理,短消息服务中心的SMPP接口协议和中国移动的互联网短消息网关的CMPP接口协议,设计并实现了车载监控中心的通信服务器。 短消息具有覆盖范围广的优点,GPRS具有传输速率高的优点,因此将SMS和GPRS二者结合实现的车载监控系统在目前条件下是最佳的选择,具有当前最大的覆盖范围和最高的用户容量。在GPRS网络覆盖的地区,车载可利用GPRS网络传输包括GPS定位数据在内的监控数据,在无GPRS网络的地区,可利用SMS来传输。 大量GPRS车载通过TCP/IP作为客户端请求连接到通信服务器,因此通信服务器会同时为大量I/O请求提供服务。为了在Windows平台下完成高性能的TCP/IP通信的网络应用程序,需要使用Winsock提供的“套接字I/O模型”,其中完成端口模型可管理大量的套接字,获得最佳的系统性能。因此本文借助于完成端口模型来管理GPRS车载套接字,获得最大的吞吐速度,实现了高性能的通信服务。 GIS在车载监控系统中占据着非常重要的位置,它可实时显示车载位置,提供图形化界面的功能。MapX是MapInfo公司提供的GIS二次开发组件,它除完成GIS功能外,还具有系统结构简洁、图形功能强大、系统规模较小的特点。最后本文在MapX组件基础上完成监控终端软件的系统总体结构,并详细描述了各基本功能模块的设计与实现。更多还原

【Abstract】 Intelligent Transportation System (ITS) is the front of the present international road traffic and development in science and technology for transportation. As an important component of ITS, Vehicle Monitoring System becomes the focus of studying.This paper analyses the advantage and disadvantage of the commonly used communication scheme in detail, introduces the new characteristic of GPRS network and proposes the communication scheme based on GPRS/SMS. The realization principle of GPRS network is analysed. In addition, SMPP interface protocol of SMSC and China Mobile CMPP interface protocol of ISMG are also researched, and then this paper designs and realizes the communication server of the Vehicle Monitoring Centre.SMS has advantage of widely covered and GPRS has advantage of high transmission rate, so combining GPRS with SMS to realize Vehicle Monitoring System is the best choice at present, which has the large coverage and high user capacity. In the area where GPRS network covers, vehicle can use GPRS network to transmit data. Without GPRS network, vehicle can use SMS to transmit data.A large number of vehicles are connected to communication server through TCP/IP, so communication server must provide service for a large amount of I/O request at the same time. In order to realize the high-performance network application program, "Winsock I/O Model" should be used, in which "I/O CompletionPort Model" can manage lots of winsocks and obtain the best system function. With "I/O CompletionPort Model", vehicle winsock can be managed, the highest transmission rate can be obtained, and the high-performance communication service can be realized.In the Vehicle Monitoring System, GIS occupies very important position. It can show vehicle position in real time and provide graphic user interface. MapX is a GIS componet that MapInfo company provides. Besides finishing GIS function, it also has characteristic of succinct system structure, strong graphic function and small system scale. Finally, on the basis of MapX, this paper designs the system architecture of the software and describes the realization of all function modules in detail.更多还原