The Key Technology Of Guidance Platform Based On The Dynamic GPS Information

With the rapid development of the economy and vehicle population, the problem of urban traffic congestion and jam is increasingly bothering the major cities of the world seriously, which causes the huge economic losses and adverse influence on the society. As the core of intelligent transportation systems, urban traffic guidance system is playing more and more important role to solve the traffic congestion and jam. Domestic and international practice showed that the urban traffic guidance system can effectively balance the network traffic flow distribution, effectively ease traffic congestion. Chinese cities widespread exist the problems such as rapid growth of vehicle population, insufficiency of road area ratio, increasingly serious of traffic congestion. It is imperatived to establish the diversified, tridimensional omnidirectional city traffic guidance system. The rapid development of GPS technology provides a new way for traffic information gathering. In 2008 Ministry of Transport put forward to encourage every province to establish the traffic guidance information platform based on GPS information, which can alleviate the city traffic congestion. It is a new way to ease traffic congestion, realize the dynamic traffic guidance and improve traffic capacity, which is based on the establishment of GPS information traffic guidance platform.Based on the research findings of the national high-tech research and development program of china (863 program):"R&D of intelligent guidance software and application systems based on dynamic information" and "Traffic guidance theory research and implement of Kunming main city based on the traffic information", we do the research on the key technology of traffic information guidance platform, which aimed to solve the increasingly serious traffic jam and realize the balance of traffic flow distribution. Firstly introduces the urban traffic status and the problems we faced. The full paper has divied into seven chapters, which the second chapter to six chapters was the key technology introduces. The first chapter mainly introduced the research purpose, background and significance. Following introduce the specific research result:(1) The basis of accurate traffic guidance information is the high quality of dynamic traffic information input. But as the GPS information platform, the accurate information is not only the basis of the platform establishment, but also is the fundamental core of the guidance system. Given the buildings too high and the viaduct overmuch in Guangzhou, it cause the GPS data loss, data error phenomena frequently, which have serious influence on the accuracy and efficiency of map matching algorithm.In this paper we do the research on GPS data guarantee technology, especially the identification, judgment and correction of dynamic drift data, and establish the drift GPS data recognition model. By correcting GSP data, it improved the accuracy of data, thus providing the guarantee for the map matching algorithm.(2)Map matching technology is an effective way to display the location of vehicles equipped with GPS in electronic map and acquire the traffic information of roads related. Current map matching algorithms are mainly used in the vehicle navigation. Map matching of vehicle mobile terminal only can realize the positioning for navigation, which is unable to realize the information interaction between the vehicle terminal and transportation center. At present, most cities begin to build the traffic information guidance center, which need to acquire locations of vehicles equipped with GPS receiver, judge the conditions of present road and the status of corresponding road by some algorithms. Compare to the vehicle terminal map matching algorithms, map matching algorithm of center platform exists some characteristics:poorer topological between road network, larger cycle of adjacent GPS information, complexity of the urban road network. According to the characteristics of the Guangzhou floating cars we studied the vehicle delay map matching algorithm. Data validation showed that the speed and accuracy of the algorithm calculation is good, which can satisfy the data quality requirements of guidance system.(3)Traffic information publishing has timeliness requirements. Some publishing ways of existing traffic information service systems are comparatively simple and lack of linkage between guidance information. Although most of the systems can meet the timeliness request, the expensive publishing cost makes most commuters unable to accept. The domestic research on how to select the traffic information publishing method is less. So our research in this paper has strong practical value. This paper focuses on the optimization technique of traffic information publishing method. By using fuzzy comprehensive evaluation methods, we optimize the existing traffic information method of Guangzhou, determining the the optimal choice of traffic information publishing method. (4)0n the analysis basis of traffic guidance evaluation system, we put forward the evaluation criterion. Through software simulation and data analysis, it is proved that traffic guidance system has high practicability, which can improve the vehicle speed and reduce the vehicle travel delay time, greatly easing the city traffic congestion.In recent years, urban traffic congestion became more serious, which might cause drivers and passengers blocked the restlessness and increase traffic accident. If the research result of this paper can be used in the actual, which based on the dynamic GPS information of traffic guidance platform, we can use the platform collected and analysis the traffic data. Then on the basis of accurate identification the road network state, we distribute the real traffic guidance information, which will effectively alter the city traffic situation and achieve real dynamic traffic guidance.