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How to choose RFID equipment for vehicle management projects?

2019-06-13 15:24:52


According to different application scenarios, choosing different RFID devices will have a great impact on the use of the entire project. The selection of RFID devices will become a key part of the project's success. At present, the three major hardware devices that make up the RFID technology system include RFID tags, RFID features and RFID readers. Today, we will analyze how RFID devices are selected based on vehicle management projects.



About RFID electronic tag selection

       First, consider the recognition distance of the RFID electronic tag. The approximate range of the required recognition distance is determined by the actual application scenario. The distance that RFID recognizes should be an important factor to consider. For different distances, the choice of equipment, especially electronic labels, is very different, mainly reflected in the working frequency of the label. In vehicle management, it is necessary to fully consider the range of distances recognized by the vehicle when acquiring vehicle tag information, which may not be too close and may lead to "group reading" phenomenon, and may not be too far to cause misreading. Among them, pay special attention to the distance between the RFID reader and the vehicle deployed to read the electronic tag information when the car enters and exits the garage, because this link involves not only the acquisition of vehicle status information, but also the garage vehicle. Statistics of information.

       Second, consider the directionality of reading RFID tags. Taking into account the characteristics of the whole vehicle logistics, whether in the assembly line of the vehicle under the vehicle, or the entry and exit of the vehicle or the dealer, the logistics operation management of these vehicles is basically continuous operation to the production line. Due to the technical characteristics of RFID, RFID can read multiple tags at the same time. However, this needs to be adjusted when the vehicle logistics enters and exits various physical links for information collection. The reading of vehicle electronic tag information should also follow the orderly principle. get on. Therefore, it is necessary to take into account the directionality of the label reading, and the higher the ordering requirement for reading, the stronger the directionality of the corresponding reading is.

       Finally, through comprehensive analysis of the usual situation in vehicle management, it is required that the collection distance of the vehicle information is basically within 1-10 meters. If the distance of the identification collection is too large, it is not conducive to management operations. Too small is not conducive to between vehicles. Distance control. Therefore, from the perspective of distance, the operating frequency of an electronic tag that satisfies this condition should be ultra-high frequency. According to the current use of this frequency band, the typical frequencies are 433.92 MHz and 862 (902) - 928 MHz. In addition, passive tags can be selected due to the high quality and longevity requirements of the vehicle management. The passive tag is small in size and light in weight, and can be mounted on the vehicle body in various shapes as required.



About RFID antenna selection

       In the vehicle management, it is often encountered in the case of adjacent tag string reading. In order to prevent group reading of vehicle information, when the reader and the tag work, the reader can only read one vehicle at a time. In order to meet this requirement, in addition to controlling the position of the RFID reader antenna, it can be realized by physical means. More importantly, the polarization of the antenna should be selected. The polarization mode of the antenna has linear polarization and circular polarization. In the similar project, the label installation direction is basically the same, so the linearly polarized antenna can be selected. The beam angle of the E-plane or H-plane of the linearly polarized antenna can be achieved. 30 degrees, so the radiation is very narrow, which is a good solution to the problem of adjacent tag string reading.

About RFID reader selection

       After determining the operating 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 the reader will be further reduced, the performance will be further improved, and the reader device will be developed in the direction of modularization and intelligence. In vehicle management, the main use of fixed readers. The RFID reader is used in vehicle management to realize the identification of the vehicle and automatically deduct the fee. If a long-distance RFID reader is used, it can realize a fast channel that does not stop, frees the card, or an unattended channel, or an unmanned electronic detection vehicle.

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