chrispeng [ad_1]
1. System overview
The urban public passenger transport system basically still uses the manual dispatching method of “fixed departures and stuck points at both ends”. Dispatchers cannot understand the conditions of operating vehicles in real time, and it is difficult to take dispatching measures in a timely and effective manner. Bus dispatching is in the status quo of “invisible and inaudible”, with greater blindness and lag. As a result, the driving speed of public transportation vehicles is reduced, the driving interval is not balanced, and the phenomenon of “crossing” and “large gaps” often occur, which seriously affects the service quality of public transportation passenger transportation. Furthermore, waiting for the bus, the public cannot know the running status of the shuttle bus they are waiting for, and do not know how long it will take to wait for the shuttle bus they take. The use of RFID technology, electronic map and wireless network technology to build a public transportation management system can realize long-distance bus collection information without stopping; automatic and accurate display of entry and exit information. Make the bus dispatching system accurately grasp the real-time dynamic information of buses entering and leaving the bus parking lot. Through the implementation of this system, the management level of buses can be effectively improved, and the collected data can be researched and analyzed using computers, and the laws of vehicle operation can be grasped, the loopholes in vehicle management can be eliminated, the intelligent management of buses can be realized, and the image of the city can be improved. Thereby improving the management level of urban public transportation operation and dispatch.
RFIDThe bus intelligent transportation system adopts advanced information and communication technology, collects dynamic and static information of road traffic, and conducts real-time analysis, and arranges the driving route and travel time of the vehicle according to the analysis result, so as to make full use of the limited traffic resources and improve the vehicle The efficiency of the use of the vehicle, but also to understand the operation of the vehicle, and strengthen the management of the vehicle. RFID technology, as an effective means of information collection in the traffic dispatch system, will play an important role in the traffic dispatch management system.
2. System principle and composition
Radio frequency identification technology, called Radio Frequency Identification in English (referred to as RFID for short), refers to the specific application of related radio technology in the field of automatic equipment identification (AEI). This technology uses wireless radio frequency to carry out non-contact two-way communication to achieve the purpose of identification and exchange data, so as to realize people’s understanding of various objects or equipment (personnel, vehicles, objects) in different states (mobile, stationary or harsh environments). Automatic identification and management.
The complete RFID system consists of a recognition card (Transponder or Tag), a base station type recognizer (Reader) and a background application system. The long-distance RFID technology is used in the application of vehicle identification. Its working principle is to configure an RFID identification card on the target vehicle. The radio frequency signal containing the unique identification code sent by the identification card is collected by the base station type identifier within the monitoring range. , Through the analysis of a computer or embedded system, you can accurately determine the identity of the vehicle, the location and time of the passing, the wireless identification function of RFID technology is applied to the tracking of the bus, and the location information of the bus in the road traffic can be collected. Effectively obtain traffic flow and other traffic data. The RFID bus intelligent transportation system is composed of an information collection network (identification base station, LED or LCD display, identification card) and a command center. The information collection network is a monitoring network composed of information collection points strategically distributed in important traffic monitoring locations in the public transportation system. An identification base station is installed at each information collection point. These identification base stations are installed on the existing traffic ancillary facilities (such as traffic lights, street lights, stations, street signs, traffic signs and signs, etc.) to reduce construction costs. Each collection point is connected to the computer system of the command center through a wired or wireless data communication network. The data communication network can be a wired communication network, a wireless dedicated network, or a mobile communication GSM network or GPRS Internet platform. The identification card is installed as an identification device on the networked public transport vehicle, and each identification card has a unique electronic identification feature (identification code) to meet the identification requirements.
The network structure is as follows:
The principle of the system is that the identification base station installed in a known location can read the data wirelessly to identify the identification device equipped with the vehicle passing through the location. The identification base stations distributed in different locations constitute a data collection network. Analyze and process to realize the identification and positioning of public transportation vehicles in motion.The picture above is the process when the bus passes the platform. The antenna coverage of the identification base station is 100-300 meters, which can basically cover the entire platform. When the bus passes the platform, the identification card installed on the top of the bus willIdentification cardWirelessly send the vehicle identity information and arrival time of the bus to the identification base station, and the identification base station uses the mobile communication GSM network or GPRS Internet platform to send the vehicle information to the dispatching room of each line, and the traffic management of the municipal administrative agency The department monitors the overall operation quality of the city’s bus lines by collecting information from various dispatching rooms. Through the identification and positioning of the bus and the transmission of the data network, the LED screen or LCD screen at the station can display to the passengers in real time the operation of the bus line and the situation of the next bus leaving and arriving at the station, so that passengers have more “The right to know”, waiting for the car to know what to do.
In addition to platforms, these recognizers and communication units can also be installed on existing traffic ancillary facilities (such as traffic lights, street lights, stations, road signs, traffic signs and signs, etc.). When the distribution of collection points reaches a certain density, The collection network can effectively cover the traffic roads in a certain area. By analyzing the data of the card-holding vehicle passing through different collection points at different times, you can grasp the vehicle’s movement trajectory, movement speed and nearest position. The computer system of the command center accepts The information collects data collected by the network and performs analysis and processing. At the same time, it also manages related databases and runs application software, and is responsible for corresponding command and communication tasks.
Further analysis of the collected data can also obtain other relevant traffic information such as average vehicle speed, traffic flow rate, etc., to provide support for intelligent traffic management. At the same time, it also provides a reference for the road traffic planning of the government traffic management department. The characteristic of the bus is that the station and the driving route are basically fixed, and the long-distance RFID identification technology can just use this characteristic of the bus to set up a monitoring network. At present, a bus station in a city is often shared by several lines at the same time. Therefore, the identification base station installed at one station can serve several lines, which greatly reduces the equipment cost.
[ad_2]
