Intelligent transportation system based on long-distance UHF handheld terminal
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In recent years, with the rapid growth of automobiles, especially private vehicles, traffic demand has continued to increase, while urban traffic infrastructure construction and traffic management are relatively backward, which has led to frequent occurrences of traffic congestion in cities, especially large and medium-sized cities. In recent years, the average number of cars in domestic cities has been increasing at an annual rate of more than 15%, and it may be even faster in the future. The average annual increase of roads is only 4% to 5%. The growth of roads is far behind the growth of cars, and urban traffic congestion has experienced unprecedented rapid growth.
Mere measures such as increasing the construction of traffic infrastructure, expanding the area of roads, and increasing police resources have failed to effectively solve the problem of traffic congestion. Therefore, it is necessary to introduce new technology, combine the mobile phone 3G communication technology card and RFID radio frequency technology to form an UHF handset with 3G communication, and establish a set of mobile phones as the carrier, with 3G communication technology card and RFID radio frequency identification technology. Combining as a technical principle, it can obtain dynamic traffic information in real time and publish it to the smart transportation system of the owner’s mobile phone.
Based on the above content, it is proposed to build an intelligent traffic information collection, analysis, and real-time display system based on the technical principles of 3G communication technology. The system can effectively relieve urban traffic pressure, reduce environmental pollution, reduce the incidence of traffic accidents, save energy, and real-time traffic information release, etc. It has important theoretical value and good application prospects.
1. Development status at home and abroad
RFID radio frequency identification technology develops rapidly abroad and is widely used. The application of Sweden’s RFID radio frequency identification technology has greatly improved the development of the city’s transportation system. Traffic congestion in the Swedish capital Stockholm is very serious, so the Swedish authorities announced a road congestion tax in early 2006. With the help of IBM, Stockholm has set up 18 roadside control stations on the road leading to the city center. By using RFID automatic identification technology and the use of lasers, cameras and advanced roadside systems for free traffic, it can automatically identify entering the city center. For vehicles in the city, taxes are automatically collected from registered vehicles entering and leaving the city center between 6:30 and 18:30 from Monday to Friday (except holidays). The collection of road congestion taxes has reduced traffic flow, reduced traffic congestion by 25%, reduced traffic queue time by 50%, reduced road traffic emissions by 8% to 14%, and reduced carbon dioxide and other greenhouse gas emissions by 40%. RFID automatic identification technology has also been successfully applied in Ireland’s natural environment. In the Wisdom Bay project in Galway Bay, Ireland, the system obtains information from sensors mounted on hundreds of buoys and obtains text messages from fishermen to learn about dangerous objects floating on the water. The information is used in various channels, including avoiding fishing boat crashes, sending water rise warnings to Galway Bay administrators, and helping fishermen sell their caught fish directly to restaurants, so that they can get higher profits.
The application of RFID in China is also very extensive. At present, RFID radio frequency identification technology and its applications are in a period of rapid rise, and are recognized by the industry as one of the most promising technologies in this century. RFID automatic identification technology has been widely used in automatic vehicle identification, non-stop electronic toll collection systems, equipment (logistics) automatic identification systems, access control identification systems, and commodity anti-counterfeiting identification systems. Therefore, the application of RFID radio frequency identification technology to achieve real-time traffic information acquisition, and on this basis to achieve services such as dynamic navigation, has good technical conditions and market conditions. Practice has proved that the use of radio frequency technology in urban traffic systems can well improve traffic conditions, improve road management efficiency, and increase road traffic capacity.
2. Intelligent transportation system based on long-distance UHF handheld terminal MT5000
(1) System composition and architecture
The RFID radio frequency identification technology is applied to the urban traffic management system to form an intelligent traffic management system. The system mainly includes: UHF Android handheld terminal with 3G communication technology, intelligent electronic police, communication network, database processing platform, Central management system server and other systems. Its basic composition is: each car owner’s parking card adopts an embedded RFID chip card, and the identification number of the card and the corresponding license plate number are associated and bound in the database management system to form an electronic license plate; A set of long-distance RFID card readers and smart electronic police are installed in each direction of traffic, and each reader is numbered; the card readers, smart electronic police and traffic light controllers are connected to the remote central management through the Ethernet controller System server: The server is optimized with a database to realize real-time fixed-point collection of vehicle information on urban roads. The fixed-point instantaneous speed, time, vehicle type, license plate, and flow rate obtained by the RFID reader can pass data inspection, matching and fusion algorithms, Converted into the section average speed, traffic flow, and travel time of the road section where the information collection unit is located. Then use methods such as operations research, short-term traffic flow prediction models, and car-following models to realize the analysis and prediction of the urban traffic network status, and use the road network status discrimination technology to realize travel dynamic route guidance and travel time estimation. Finally, the road network information can be displayed on the screen of the mobile phone or the STK package text message can be used to realize the voice prompt, which is convenient for the driver to grasp the traffic information of the whole road section and realize safe and fast travel.
(2) The working principle of the system
Based on the long-distance UHF handheld terminal MT5000 vehicle management system can realize the function of long-distance wireless communication, which can replace the RFID carrier installed on the vehicle. Based on the technical principles of the long-distance UHF handheld terminal MT5000 vehicle management system, there are :
Using RFID radio frequency identification technology, through the YXU1861 UHF card reader installed at each traffic intersection, it can read the traffic flow in each direction of each traffic intersection in real time. Combined with the database platform of the control center, it can be determined to pass Vehicle information at each traffic intersection; according to the traffic volume on the traffic road, the optimal control of the traffic signal delay of certain streets can be implemented to achieve the purpose of optimal control; by reading the information the time when the vehicle passes the card reader , Through simple calculation, the required running time of each road section can be obtained, and then the traffic operation status can be analyzed; the intelligent electronic police system based on digital image processing technology can automatically identify the illegal vehicles at the traffic intersection and read it out with RFID automatic identification technology The ID number can determine the relevant information of the specific illegal vehicle and the owner; statistics of vehicle parameters and models of each traffic intersection, so as to perform statistical analysis on the traffic conditions of the entire city, in order to provide a basis for future urban traffic construction and planning.
At the same time, the 3G communication technology card supports functions such as mobile payment transactions. The special short-range communication between the microwave antenna on the ETC lane of the vehicle passing the expressway toll station, the mobile phone payment system and the bank for background settlement processing, so as to achieve the purpose of paying the fee without stopping the vehicle through the road and bridge toll station, greatly improving The capacity and toll efficiency of toll junctions are improved.
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