Nowadays, the use of cloned taxis and trucks to operate in society has become increasingly serious. The so-called clone car is one or more unlicensed and unlicensed vehicles that apply another vehicle that has legal procedures. The vehicle models, appearances, license plates, travel documents, insurance, inspection certificates, vehicle and vessel use taxes, engines, and frame numbers are the same for these vehicles. Therefore, it is impossible to identify whether a vehicle is a legitimate vehicle in appearance alone. According to industry insiders, some cities currently have thousands of black car races, which has seriously disrupted the taxi market. However, due to the original law enforcement measures, basically only rely on vehicle owners to report to investigate. The taxi industry calls for the use of high-tech methods to use automatic identification systems to rectify black cars. In addition to this, the vehicle automatic identification system can also be used to report to other taxis nearby emergency situations such as being robbed, as well as to monitor and track the stolen vehicles.
I. Introduction to Wireless WSN Network Technology Wireless WSN network is a low-cost, low-power, high-speed networking and two-way communication. There is a coordinator in each PAN of the wireless WSN network. It has a unique identifier. And it can connect with 65536 subnodes at the same time, and the optimal communication quality distance of its nodes is between 10m and 100m. It can form a wide range of network coverage. It is suitable for long-distance low-rate identification systems.
Second, wireless WSN network automatic vehicle identification system
2.1 System Introduction The vehicle automatic identification system consists of five parts: vehicle-mounted sub-node, data read-write WSN gateway node, remote data transmission module and control center, and hand-held observer. Among them, the on-vehicle sub-nodes installed in the car and the data read-write nodes installed on the road side or toll station are the core parts of the entire system. The on-board sub-node can read and write relevant inspection information including vehicle engine, frame number, license plate number, vehicle number, and annual review status, and is equipped with an emergency button, buzzer, and indicator light. The sensor can also be used regularly. The component reads and writes the information needed inside the car. The data reading and writing unit arranged on the side of the road is generally divided into two parts: a read-write node and a remote transmission module. When any vehicle with a built-in vehicle sub-node enters a road section where a monitoring system has been placed, the read-write node activates the on-board sub-node in the vehicle. A command is issued to allow the sub-node to start transmitting data, and the on-board warning light is received according to the received light. The frequency starts to flash. The onboard sub-node channel access time is 15ms.
The read-write node is responsible for receiving the information transmitted from the sub-nodes on the vehicle and transferring it to the WSN gateway for processing. The remote-control module then transmits the relevant information to the control center and can also be transmitted to the handheld observer of the relevant manager. The handheld viewer can be a mobile terminal or a PDA that stores more energy. The control center organizes the data read and written and the inherent information of the child nodes, and can obtain the detailed information of the vehicles traveling on the road section, and then update the saved information in the database, according to the number of the read-write node of the road section in which the vehicle is traveling. , It can automatically position and monitor the driving route of the vehicle during that period of time.
2.2 System Functions:
1) Identifying black cars: Assuming that all regular taxis have sub-nodes installed on vehicles, the black car does not have sub-nodes installed on the car. When the vehicle runs over intersections or hand-held observers equipped with read/write nodes, the car sub-nodes are already installed. All regular cars receive the commands issued by the read and write nodes, start to transmit the authentication data to the read-write node, and start the indicator lights according to the received strobe commands to start the same frequency strobe at the frequency of the strobe commands. When the black car is exposed at a glance, there is no place to hide. If the black car also wants to imitate the strobe, the black car cannot be synchronized because the read/write node changes according to the instruction or random frequency, and it is also exposed to the public. .
2) Identification of stolen vehicles: When a vehicle equipped with an onboard child node is stolen, the owner can register with the monitoring center and enter information such as the lost vehicle's license plate number into the database. When a stolen car passes through a section where read-write nodes are arranged. It will be immediately identified and an alarm generated. According to the read-write node road number, the stolen vehicle can be tracked and dispatched.
3) Strengthen management means: Install reading and writing nodes in the vehicle inspection area, and send the results of the inspection to the on-board sub-nodes. When the failed vehicles pass through roadside read/write nodes or hand-held observers, the indicator lights will Strobe review abnormal information.
4) Emergency near-site help: At present, taxis mainly use remote rescue methods to help them. They have poor timeliness. They do not receive timely support from nearby taxi partners. After installing the on-board nodes, the driver presses an emergency button when an emergency occurs. The strobe light will be in an emergency light and the robbers in the car will not be able to know. Vehicles equipped with vehicle nodes within 100 meters around will receive emergency information. The buzzer installed in the car will ring and look around. The vehicle's warning light and the distressed vehicle will be clearly indicated.
5) Real-time monitoring and guidance of taxi traffic volume at roads and places: Effective guidance of taxis is an important means to increase taxi occupancy rate, reduce gasoline waste, and increase driver income. Effective guidance requires real-time statistical data on taxi traffic. At present, it is mainly relying on the visual observation of taxi drivers or video surveillance systems to obtain fuzzy judgment data for publication and taxi guidance. With accurate and historical records, after using this system, all road nodes will transmit the taxi statistics passed to the relevant departments in real time. All the above requirements will be solved through the central management software, and the real-time guidance information will be passed through the road signs and traffic. Radio or text messages are issued to the relevant staff. At the same time, this function can also serve as a statistical basis for the amount of taxi ownership and provide a scientific basis for the amount of taxis to be delivered.
3. Summary With the development of vehicle operations and communication technologies, the requirements for the intelligentization of traffic management systems, such as vehicle identification systems, are also increasing. However, the current identification method is still in the original stage of observation or short-distance parking recognition. It needs to use high-tech means to combine wireless communication technology with vehicle management. Through the analysis and comparison of technology and application, it can be seen that wireless WSN network is very suitable for vehicle automatic identification system, and the use of new wireless technology provides a low-cost, accurate and effective, safe, reliable and rapid automatic identification system. may.