At present, the society is increasingly inclined to adopt the automatic identification (AVI) system based on active RFID technology. The AVI system can be installed at the city entrance and exit, form an AVI fixed base station or be installed on a police car to form an AVI system mobile station. The mobile AVI system is one of the practical and effective means to solve the above problems. It can be parked at the designated venue entrance, or roadside, or checkpoint, or toll booth as needed; it can accurately and reliably collect real-time from it. The data of the vehicle that is driven by (or docked), equipped with an active proximity card, uses long-range radio frequency identification (RFID) technology to identify and process the information, and pass the information through the communication network (GSM/GPRS). /CDMA) Transfer to the vehicle management center computer, compare it with the information about the vehicle already stored in the database, determine whether the vehicle is illegal or stolen, and compare the judgment results and instructions to the AVI system in real time, and decide The handling of the car. The comparison judgment result and the vehicle related information can be printed. For illegal vehicles that have been blacklisted, they can be intercepted on the spot or notified to the checkpoint in front of the vehicle through the communication device for interception.
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Challenges and needs
With the rapid development of China's economy and transportation, the total number of cars in China has exceeded 60 million at this stage, and it is growing at a rate of more than 10% per year. With the increase of vehicles, the violation of laws and regulations such as evading annual inspection, misappropriation of number plates, use of fake license plates, and modification of stolen vehicles has increased. With the continuous improvement of people's living standards, the number of urban taxis has soared, and a few car owners refused to operate. License, or apply for low-cost operation licenses in small towns around the city, and carry passengers in large cities. Such taxis (commonly known as "black cars") infringe on the interests of the state and the industry; with the deepening of China's reform and opening up and accession to the WTO, large-scale international and domestic meetings, as well as cultural and sports exchange activities are increasingly frequent, traffic jams on the scene, no license The phenomenon of intrusion, disputes and even public security criminal cases has occurred from time to time; in some local areas, vehicle theft is extremely serious and has already threatened the harmony and stability of the region.
In view of the above-mentioned violations of laws and regulations, in the past, the vehicle management department relied mainly on card sampling, temporary addition of police force and duty personnel for treatment. Obviously, the efficiency of this method is extremely low, and on-site verification is very difficult. It is not uncommon for the officers and passengers to deny. In terms of solving vehicle theft, GPS has also been a relatively broad technical choice. GPS anti-theft is an active network system and is a large system. The service staff of the monitoring center provides the owner with 24/7 service 24 hours a day, including alarms, pre-alerts and assistance for police. But at present it is not very popular, the main reason is that the price is too high. It takes six to seven thousand yuan to install a set of GPS without a display screen, and it is necessary to pay a service fee of nearly one thousand yuan to the service provider every year. The high cost has discouraged many car owners. Especially for taxi owners who are seriously robbed, if not specifically mandated, few people are willing to equip GPS anti-theft systems with expensive equipment and services.
In this case, RFID technology can be combined to achieve cost reduction. At present, the society is increasingly inclined to adopt the automatic identification (AVI) system based on active RFID technology. The AVI system can be installed at the city entrance and exit, form an AVI fixed base station or be installed on a police car to form an AVI system mobile station. The mobile AVI system is one of the practical and effective means to solve the above problems. It can be parked at the designated venue entrance, or roadside, or checkpoint, or toll booth as needed; it can accurately and reliably collect real-time from it. The data of the vehicle that is driven by (or docked), equipped with an active proximity card, uses long-range radio frequency identification (RFID) technology to identify and process the information, and pass the information through the communication network (GSM/GPRS). /CDMA) Transfer to the vehicle management center computer, compare it with the information about the vehicle already stored in the database, determine whether the vehicle is illegal or stolen, and compare the judgment results and instructions to the AVI system in real time, and decide The handling of the car. The comparison judgment result and the vehicle related information can be printed. For illegal vehicles that have been blacklisted, they can be intercepted on the spot or notified to the checkpoint in front of the vehicle through the communication device for interception.
application solution
1. Automatic Vehicle Identification (AVI) based on active RFID technology, including vehicle radio frequency tag, fixed base station AVI system and mobile base station AVI system.
1, car RF tags
The vehicle radio frequency tag has vehicle information, vehicle status, and vehicle owner information. This radio frequency tag has a unique ID code in the world, and the identification number and its information are stored in the information exchange network of the public security department. Generally, it is in a state of static alert until the car is stolen or the owner requests traffic. The information query is only started. This identification number helps the police identify and track stolen vehicles. Vehicle RF tags are designed to be secure, reliable, and as concealed as possible without affecting normal operation. A special installation can be used so that once the tag is removed, the alarm service can be automatically activated to prevent the tag from being misappropriated.
2. Fixed base station AVI system
With active microwave tags, the reading distance can reach 2 to 80 meters. Fixed base station AVI system is generally used for customs, checkpoints and traffic toll stations, to inspect, identify and record passing vehicles, equipment (such as readers, intelligent controllers, data transmission units, power supplies, etc.) installed next to the driveway. Inside the machine room.
When the vehicle carrying the RFID tag passes through the lane, the system reads the ID identification number in the tag, superimposes the passage time and the lane number, and stores it in the memory of the intelligent controller. The data transmission unit transmits the vehicle data information collected by the system to the management center (or computing center) of the public security and transportation department through the communication network (such as DDN), and simultaneously reaches the AVI system under the control command of the management center, and determines the automatic control of the vehicle. Release or intercept.
3. Mobile base station AVI system
In some applications, such as public security criminal investigation, road inspection, and important conference security, a mobile AVI system is required to be activated and docked at a designated roadside (or entrance to the venue) to conduct surprise inspections and identification of passing vehicles. Its device configuration is similar to that of the AVI system fixed base station, but it is more simplified. The mobile AVI system can be installed on a modified police car, and communicates with the command center or exchanges data information by means of a mobile communication network (GSM) via a mobile communication network (or other means). If it is necessary to report the location of the mobile AVI system, the GPS receiver can also be configured on the vehicle to transmit the location of the mobile station to the command center by means of GSM short message.
4, simple mobile inspection equipment
In some applications, a simple mobile auditing device (PDA handheld reader) can also be used. Inspectors can use a PDA reader to check passing vehicles in certain narrow areas. The PDA reader downloads the stolen vehicle information (blacklist) in advance, and immediately reports the same information.
Second, the anti-theft network based on AVI and GPS
The system consists of fixed AVI, mobile AVI, GPS positioning and navigation system, DDN data transmission and exchange system and GSM mobile communication system. The schematic diagram is shown in Figure 1.
When the user using this technology determines that the vehicle has been stolen, he will report the police to the police. After receiving the alarm, the police will issue a finger.
Let each fixed AVI detect the passing vehicle, read the RFID tag of the passing vehicle, and then perform the information with the target vehicle.
Comparison. If the current vehicle is the target vehicle, the vehicle ID, the fixed AVI position, and the time information are sent to the police via the DDN.
After receiving the signal, the police sent the SMS message to the police car equipped with mobile AVI and GPS through GSM. After confirming, the police car found the best path through the path optimization on the GPS positioning and navigation system. After repeated information Confirmation and path optimization, and constantly send their GPS location to other police vehicles, and finally seize the stolen vehicles, so that illegal elements are arrested. The entire process of recovering stolen vehicles is shown in Figure 2.
In addition to the anti-theft function, the system can also add road and vehicle location query functions to vehicles equipped with a GPS system.
Under the premise of ensuring anti-theft, the system effectively reduces the cost by using RFID technology, which can be accepted by most people, saving police power and improving the reaction speed, especially in the taxi industry. At the same time, the system is combined with the electronic stop-and-charge (ETC) system, the equipment (logistics) automatic identification (AEI) system, and the access control identification (GAI) system to form an important part of the intelligent transportation system.
Note: This type of application can also be adapted to the field of anti-counterfeiting identification management of military and police vehicles.
Program characteristics
l High recognition accuracy and support for high traffic flow. Using frequency hopping technology, the effect of anti-inter-frequency interference is good, and multi-vehicle identification can be performed at the same time, and up to 200 vehicles can be identified at the same time.
l Use the world's only identification number to identify the identity of the vehicle, reliable, safe, and without a heavy number.
l Mobile identification station (handheld reader) is available for special cases.
l The mobile identification station is very mobile and can exchange data with the control center at any location covered by the GSM/CDMA network.
l The equipment cost is low and the system has a large effect.
l Long distance: It can be identified within 80 meters, and it can be recognized without manual proximity to the card or through the designated area to realize automatic identification.
l Support high-speed mobile reading, the identification card can move at speeds of up to 200 km/h.
l Two-way high-speed data exchange between the identification card and the reader.
l High reliability, working temperature -40 ° C ~ 85 ° C, waterproof, anti-shock, suitable for outdoor harsh environments.
l High anti-interference: no special requirements for various interference sources on site, easy to install.
l The global open ISM microwave band does not require application and payment.
l Ultra-low power consumption: Safer and healthier for the human body.
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