How to quickly select RFID equipment for vehicle management projects?

　　According to different application scenarios, the choice of different RFID equipment will have a great impact on the use effect of the entire project. The selection of RFID equipment will become a key part of the success of the project. At present, the three major hardware devices that make up the RFID technology system include RFID electronic tags, RFID characteristics and RFID readers. Today, we will analyze how to select RFID equipment based on the project analysis of vehicle management.

　　About RFID electronic tag selection

　　First of all, we must consider the recognition distance of RFID electronic tags. The approximate range of the required recognition distance is determined through actual application scenarios. The distance of RFID recognition should be an important factor to consider. For different distances, the choice of equipment, especially electronic tags, is very different, which is mainly reflected in the working frequency of the tags. In vehicle management, it is necessary to fully consider the distance range for vehicle identification when obtaining vehicle tag information. The distance should not be too close to cause "group reading" phenomenon, or too far to cause misreading. Among them, pay special attention to the distance between the RFID reader deployed to read the electronic tag information of the vehicle and the vehicle when the car enters and exits the garage, because this link not only involves the acquisition of vehicle status information, but also involves the garage vehicle Information statistics.

　　Second, consider the directionality of reading RFID electronic tags. Taking into account the characteristics of vehicle logistics, whether the vehicle is in the production line or the final assembly link, or the vehicle enters and exits each lane or dealer, the logistics operation management of these vehicles is basically the same as the continuous operation of the production line. Due to the technical characteristics of RFID, RFID can read multiple tags at the same time. However, this requires adjustments when collecting information in each physical link of the entire vehicle logistics. The reading of vehicle electronic tag information should also follow the principle of orderly, one by one. get on. Therefore, the directionality of label reading must be taken into consideration. The higher the requirement for the order of reading, the stronger the requirement for corresponding reading directionality.

　　Finally, through comprehensive analysis of the general situation in vehicle management, it is required that the collection distance of the entire vehicle information is basically within 1-10 meters. If the distance of the recognition collection is too large, it is not conducive to management operations, and too small is not conducive to the communication between vehicles. Distance control. Therefore, in terms of distance, the working frequency of an electronic tag that meets this condition should be UHF. According to the current use of this frequency band, typical frequencies are 433.92MHz and 862(902)-928MHz. In addition, since vehicle management has higher requirements for the quality and life of tags, passive tags can be selected. Passive tags are small in size and light in weight, and can be made into various shapes and installed on the car body as required.

　　About RFID antenna selection

　　In vehicle management, we often encounter the situation of adjacent tag string reading. In order to prevent the group reading of vehicle information, when the reader and the tag are working, as far as possible, the reader can only read one vehicle at a time. Electronic tags, to meet this requirement, in addition to controlling the location of the RFID reader antenna installation and placement through physical means, it is more important to select the polarization of the antenna. The antenna polarization methods include linear polarization and circular polarization. In similar projects, the label installation direction is basically the same, so you can choose a linear polarization antenna. The beam angle of the linear polarization antenna can be achieved. 30 degrees, so the radiation is very narrow, which solves the problem of adjacent label cross reading.

　　About RFID reader selection

　　After determining the working frequency of the RFID system and the polarization mode of the reader antenna in the entire vehicle management, the choice of the reader is relatively fixed. With the development of RFID technology, the price of readers will be further reduced, performance will be further improved, reader devices will develop in the direction of modularization and intelligence. In vehicle management, fixed readers are mainly used. RFID readers are used in vehicle management to realize the identification of vehicles and automatically deduct fees. If a long-distance RFID reader is used, a fast channel without stopping or taking out a card can be realized, or an unattended channel, or unmanned electronic detection of the entry and exit of vehicles.

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