The Application of Long-distance RFID Technology in Parking Lot Management Can Effectively Manage th

With the increase of car ownership, the contradiction between urban cars and parking spaces has become increasingly prominent, which hinders the development of China's national automobile industry and urban traffic construction. At present, some parking lots are managed by magnetic card and contact ID card. This application has a certain effect on alleviating the parking problem, but the application of this technology has obvious shortcomings, that is, the speed of vehicle entry and exit is relatively slow, and the card can only be issued automatically through the card issuing machine or directly manually, which leads to its relatively low efficiency.

The application of long-distance RFID RFID technology in parking lot management can effectively manage the parking lot. It has the characteristics of orderly entry and exit of vehicles, simple procedures, fast speed, security and anti-theft, automatic management, fair and reasonable charging, no loss of receivable expenses and reducing management personnel.

Radio frequency identification technology (RFID) has matured and developed rapidly since the 1980s. It is understood that RFID (radio frequency identification) technology, also known as electronic tag and radio frequency identification, is a communication technology. It can identify specific targets and read and write relevant data through radio signals without establishing mechanical or optical contact between the identification system and specific targets. Common technologies include low frequency (125k 134.2k), high frequency (13.56MHz), UHF, passive and so on. RFID technology covers a wide range. Many automatic identification technologies in application can be attributed to RFID technology.

As a radio frequency identification technology, RFID refers to the application of radio frequency identification signals to identify objects. RFID technology is a technology with built-in radio chip, which can store a series of information. The volume of RFID products can be very small, and can be attached to the entity to be identified to quickly read its stored information in a non-contact way.

RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies the target object and obtains relevant data through radio frequency signals. The identification work does not need manual intervention and can work in various harsh environments. RFID technology can identify high-speed moving objects and multiple tags at the same time, which is fast and convenient to operate. It is understood that China Internet of things school enterprise alliance believes that the rapid development of RFID technology is of great significance to the progress in the field of Internet of things.

2 Classification of products derived from RFID Technology

At present, there are about three categories of products derived from RFID Technology: passive RFID products, semi-active RFID products and active RFID products. Passive RFID products are the earliest, most mature and most widely used products in the market. For example, bus cards, canteen meal cards, bank cards, hotel access cards, second-generation ID cards, etc. can be seen everywhere in our daily life and belong to the close contact identification category. The main operating frequencies of its products include low frequency 125kHz, high frequency 13.56MHz, ultra-high frequency 433MHz and ultra-high frequency 915MHz. Semi active RFID products combine the advantages of active RFID products and passive RFID products to give full play to the advantages of microwave 2.45G under the trigger of low-frequency 125kHz frequency. Semi active RFID technology, also known as low-frequency activation trigger technology, uses low-frequency short-range accurate positioning, microwave remote identification and uploading data to solve the functions that can not be realized by simple active RFID and passive RFID. In short, it is to activate positioning at a short distance, identify and upload data at a long distance. Active RFID products are slowly developed in recent years. Its long-distance automatic identification characteristics determine its huge application space and market potential. It has important applications in the field of remote automatic identification, such as intelligent prison, intelligent hospital, intelligent parking lot, intelligent transportation, smart city, smart earth and the Internet of things. Active RFID has sprung up in this field, which belongs to long-distance automatic identification. The main operating frequencies of the products are UHF 433MHz, microwave 2.45GHz and 5.8gmhz.

3 Work flow principle of parking lot RFID system

The working principle of the system entrance process is: when the vehicle enters the working area of the reader / writer, the system automatically receives the information transmitted by the electronic tag (RFID) on the vehicle and transmits the information to the computer at the entrance. The computer checks the effectiveness of the tag number and controls the camera to capture the vehicle image. After judgment, it is processed according to the following procedures. (1) If the electronic tag is valid (i.e. the user is legal), control the gate to lift, and the vehicle can enter the parking lot without stopping; (2) If the electronic label is invalid (i.e. expired, unregistered or insufficient), the system will give a visual and audible alarm, and the LED prompt board will give one of the following prompts according to the error reason, that is, "the monthly label has expired, please renew", "the user does not exist, please re-enter the ID" or "insufficient balance, please recharge", and the control gate will not lift. At this time, security personnel or drivers can contact the management center through the internal communication system, and they will be handled in time. After the gate is lifted, the central control system automatically saves the information of vehicles in the yard (mobilization time, tag number, etc.). When the vehicle passes through the gate, the system will start the anti smashing device to prevent smashing. After the vehicle passes through the gate, the system will automatically close the gate.

4 Application of RFID technology in intelligent parking lot

The traditional parking lot management system focuses on the billing and charging management functions, focusing on the access time of each vehicle to facilitate charging, but less on the safety, operation efficiency and humanized requirements for customers. In view of the current situation, someone proposed an intelligent parking lot management system to realize automatic vehicle identification and information management, improve vehicle traffic efficiency and safety, and count vehicle access data to facilitate the scheduling of managers, so as to reduce the labor intensity of managers and improve work efficiency.

The performance characteristics of intelligent parking lot system are as follows:

1 Radio frequency identification technology and computer control are adopted, with high degree of automation and accurate control.

2 It adopts long-distance intelligent identification label technology, with good anti-counterfeiting performance. A parked vehicle has a tag card with a unique serial number that cannot be changed. Multiple encryption technology, unique identification, unable to copy. And only the system is issued and approved.

3 The non-contact smart tag card has no mechanical contact action, long-distance inductive communication and no directionality. The card can complete the card reading operation without stopping the vehicle within the long-distance card reading range of the reader / writer, which is convenient for users.

4 The gate automatically rises and falls according to the traffic conditions of vehicles, and has the function of anti smashing vehicles.

5 Parking charges are counted and confirmed by computer.

6 The combination of computer network and charging software prevents illegal modification and unauthorized access to data.

7 The management computer and each charging computer can realize real-time communication, and the management computer has external interface and strong network expansibility.

8 The standard industrial control system structure is adopted, and the configuration of different systems can be organized according to the different requirements of users, which is convenient and flexible.

9 The installation, commissioning and maintenance are simple and convenient, and easy to replace and repair.

10 The whole system has stable performance and reliable use.

RFID system has incomparable advantages over other identification systems. In addition, the anti fouling and anti-wear performance of data carrier in RFID system is very good, which is conducive to improve the reuse rate of carrier, increase its service life and reduce the use cost. Therefore, RFID system is adopted in intelligent parking lot management system.

The operation process of the parking lot management system is based on the process of customers' parking and picking up, and the work process of the parking lot is always centered on the process of users' vehicles entering and leaving the parking lot. Parking lot users are generally divided into temporary users and fixed users. When the vehicle drives into / out of the antenna communication area of the parking lot, the antenna carries out two-way data exchange with the on-board RF card in the form of microwave communication, reads the relevant information of the vehicle from the RF card, automatically identifies the RF card and judges whether the vehicle card is valid and legal. The lane control computer displays the license plate number and driver information corresponding to the RF card one by one; The lane control computer automatically stores the relevant information of passing time, vehicle and driver into the database. The lane control computer makes a decision on release or prohibition according to the unique data.

The rapid development of RFID technology is of great significance to the progress in the field of Internet of things. The application of RFID technology in intelligent parking lot promotes the transformation of traditional parking lot, and the application of RFID technology promotes the intelligent upgrading of parking lot. The application of RFID technology not only makes the vehicles in and out orderly, simple procedures, fast speed, security and anti-theft, but also reduces the corresponding management personnel, which undoubtedly brings great convenience to the parking lot management and relatively reduces the management cost of the parking lot. However, the popularity of RFID is facing important problems, mainly the high cost of RFID chip. The yield of the product is not high, which virtually increases the production cost of the enterprise, resulting in the difficult popularization of RFID. However, if effective measures can be taken in the application to realize the mass production of RFID tags, the price of RFID tags will fall rapidly, and its application and popularization in intelligent parking lots will be just around the corner.