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According to different application scenarios, the selection of different RFID equipment will have a great impact on the use effect of the entire project, and the selection of RFID equipment will become a key part of the success of the project. At present, the three major hardware equipment packages 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. Determine the approximate range of the required recognition distance through the actual application scenario. The distance of RFID recognition should be an important factor to be considered. For different distances, the choice of equipment, especially the electronic tag, is very different, which is mainly reflected in the working frequency of the tag. In vehicle management, it is necessary to fully consider the distance range of vehicle identification when obtaining vehicle tag information. The distance should not be too close to cause “group reading” phenomenon, and it should not be too far to cause missed reading and 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.
Secondly, consider the directionality of reading RFID electronic tags. Taking into account the characteristics of vehicle logistics, whether the vehicle is in the production line out of the final assembly link, or the vehicle enters and exits various lanes or dealers, 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. conduct. 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 a 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, the typical frequencies are 433.92MHz and 862(902)-928MHz. In addition, since vehicle management requires high quality and longevity 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. In order to meet this requirement, the electronic tag can not only control the installation position of the RFID reader antenna and realize it through physical means, but it is more important to select the polarization method 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 E-plane or H-plane of the linear polarization antenna can be achieved. 30 degrees, so the radiation is very narrow, a good solution to 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/writer antenna in the entire vehicle management, the choice of the reader/writer 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, it can realize a fast channel without stopping and without taking a card, or an unattended channel, or an unmanned electronic detection of the entry and exit of vehicles.
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