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1 background
With the rapid economic development of our country, the theft of vehicles (bicycles, electric vehicles, automobiles and other related vehicles) is extremely serious in some local areas, which has seriously threatened the harmony and stability of the region. In terms of solving vehicle theft prevention, GPS was also a relatively extensive technology choice. GPS anti-theft is an active network system and a large system. The service personnel of the monitoring center provide car owners with 24/7 uninterrupted services, including alarming, preparation before the police and assisting the police. GPS is mainly used in large vehicles such as private cars, taxis, and construction vehicles. But it is not very popular at present, the real reason is that the price is too high. It costs six to seven thousand yuan to install a set of GPS without a display screen, and a service fee of nearly one thousand yuan is paid to the service provider every year. The high cost discourages many car owners. In this case, RFID technology can be combined to achieve the goal of reducing costs. At present, the society is increasingly inclined to adopt the automatic vehicle identification (AVI) system based on active RFID technology. The AVI system can be installed in residential areas, unit entrances and exits, or in fixed locations such as residential areas or unit car storage points, forming AVI fixed base stations . It can accurately and reliably collect the data information of vehicles passing by (or parked) and equipped with active proximity cards in real time, using remote radio frequency identification (RFID) Technology to identify and process the information, and transmit the information to the management center computer through the communication network (Ethernet/GSM/GPRS/CDMA), and compare it with the information about the vehicle stored in its database to determine whether the vehicle is It is legal, and the comparison judgment results and instructions are returned to the AVI system in real time to determine the treatment (release or verification) of the vehicle.
2 Introduction to RFID
2.1 Overview of RFID
Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology (hereinafter referred to as RFID technology) realized by radio frequency communication. RFID tags have the characteristics of small size, large capacity, long life, and reusability, and can support fast reading and writing, non-visual recognition, mobile recognition, multi-target recognition, positioning and long-term tracking management. RFID technology is applied to fixed asset management, confidential asset management, valuables anti-theft, vehicle supervision and other fields, which can greatly improve management level and management efficiency, and ensure the safety of related carriers.
2.2 Basic structure of RFID system
The most basic RFID system consists of three parts: hardware, software and basic data format and communication protocol. The hardware part mainly includes: tags (consisting of chips, each tag has a unique electronic code, attached to the object to identify the target object); reader (device for reading tag information, can be designed as a handheld or fixed); antenna (The radio frequency signal is transmitted between the tag and the reader, which is generally internal submersible).
The software part of the RFID system mainly includes two aspects: middleware application platform and application management software. The middleware platform has the following key features: 1) Provide a standardized interface compatible with different RFID readers; 2) Provide data filtering and message conversion and transmission in different formats; 3) Effective management and monitoring of RFID hardware facilities; 4 ) Support different application software systems’ requests for RFID data; 5) Support the enterprise’s original systems and standardized protocols.
2.3 The working principle of RFID system
In the actual application of the RFID system, the electronic label is hung or pasted on the electric bicycle, and the electronic label corresponds to a unique ID serial number. The reader can read and identify the electronic tag without contact, and send the read information to the computer host for related processing, so as to automatically identify the object.
2.4 Advantages of RFID technology
(1) Fast identification and batch processing;
(2) Wide application fields and various forms;
(3) Anti-pollution, suitable for harsh environments;
(4) Can be reused;
(5) Strong penetrating and unbarred reading;
(6) Information security.
3 Application scheme
3.1 Basic components of the system
The park’s vehicle anti-theft management system consists of several parts: long-distance card readers, electronic tags, signal lights, controllers, system management software, and card issuers.
3.2 Architecture diagram of vehicle anti-theft system
3.3 Fixed point monitoring in the park
As shown in the figure above, the active RFID radio frequency tag identification park vehicle anti-theft system consists of a long-distance reader, active electronic tags and a background application system. Since the active radio frequency tag has its own power supply, its signal transmission distance is longer than that of the passive tag, which is suitable for the monitoring of long-distance items. The maximum identification distance is usually 150 meters, which can be used to form a large-scale remote item dynamic monitoring surroundings. The active tag is attached to the electric bicycle and can be designed with anti-disassembly design, that is, once the tag is forcibly removed from the target item, the tag will automatically send an alarm signal to the reader and trigger a background alarm system. The reader antenna adopts a special design, and the signal sent by it can be stably covered in a specific area set in advance. If an item in a coverage area leaves the area, unless the reader obtains another legal card number of the electric bicycle in advance, the background system After learning that the tag has left this area, the alarm system will be triggered immediately, so as to avoid the loss of the electric bicycle in the storage place.
3.4 Park entrance and exit monitoring
As shown in the figure above, one electronic label is hung or pasted on the surface of the electric bicycle, and the other electronic label is carried by the owner. When the owner or the criminal suspect drives in and out of the park gate, the card reader will automatically collect the electronic label information. When a piece of electronic tag information or two irrelevant electronic tag information is collected, the vehicle is considered to be an illegal vehicle or an unsafe vehicle. At this time, the red light is on to remind the security personnel to intercept until the question is resolved; if the reader also collects If the two pieces of relevant electronic tag information are correctly compared by the software, the vehicle is considered to be a legitimate vehicle. At this time, the green light is on and the vehicle can travel safely;
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