From the national second-generation ID card, Shanghai Special Olympics RFID application, Beijing Airport RFID baggage transfer system, Guangzhou-Shenzhen Railway RFID ticket application to Shenzhen Library RFID application, RFID has become ubiquitous. However, in the application process, RFID has suffered various degrees of setbacks. On December 7, the reporter interviewed Dr. Sima Cong, General Manager of Asia Pacific, REVA, a provider of RFID networked application solutions.
RFID is a technology that uses wireless methods for identification, and its frustration comes from its particularity. RFID can be used in many frequency bands, but there are several main frequency bands that are actually used in industrialization. There are several main frequency bands used in the low frequency range: 125 kHz in the low frequency range, 13.56 megahertz and 433 megahertz in the higher frequency, and 800 in the UHF. In the megahertz to 900 MHz band, there are 2.4G and 5.8G bands, and in RFID applications, the 13.56 MHz band accounts for more than half of the annual business volume.
"This is the most common frequency band used by us. The card and the second-generation ID card are in this frequency band." Sima Cong said. Because the contact distance is relatively short, when you get on and off the bus, people need to put the card on the reader, go to the airport to self-check the boarding pass, and also need to put the ID card in the automatic reading area of ​​the machine. The 13.56 MHz application is already very mature, and the UHF band is a new challenge market.
Although the industry is generally optimistic, the RFID application in the UHF band will increase to a considerable share, but there are many setbacks and challenges in the promotion, mainly reflected in several aspects:
In the first aspect, the RFID system needs different tags and different readers according to different needs. The manufacturer may not be the same, but the application system must be a heterogeneous platform. The heterogeneous platform must be It is a big challenge for system integrators to integrate products from different vendors through a holistic solution.
In the second aspect, in UHF band applications, the distance between the tags being read and written is relatively long, ranging from a few meters to tens of meters. In a more complicated production environment such as supermarkets and warehouses, there are generally multiple antennas placed on the site. Which frequency band does the antenna use? Which antenna does the tag receive? How to control it? Interference between the antennas may also cause problems. If these problems are not solved, it is impossible to accurately read the RFID data.
The third aspect is the requirement for time and deployment efficiency. The requirements of customers vary widely. If you want to design RFID into a specific production environment, you need a process of deployment and on-site debugging. At the same time, you need to solve the problem very quickly. This kind of contradiction also brings more challenges.
The fourth aspect, after getting the RFID data, it needs to be sent to the application. How to make the most use of it for such precious data? Wal-Mart's experience is that after getting RFID data in the background, it is passed to 28 different applications. Therefore, the integration of data is also a complex challenge.
"An important feature of RFID is that each tag can only receive one signal at a time. If there are more sources, it will cause interference. The tag does not know which signal to accept. Just like the radio, only one can be heard at the same time. Frequency band," said Sima Cong.
In the face of these system engineering problems, REVA believes that network is a good way: put an intelligent network hub, according to this hub device to optimal control of RFID antenna positioning, including optimal control of band segmentation, Optimal control of each antenna position optimizes all reader and antenna timing. This minimizes collision and inefficiency, resulting in the highest utilization of readers in complex environments.
REVA's network hub is called the TAP-tag acquisition processor. When a tag is detected by multiple antennas, the TAP performs logical calculations through various algorithms and then accurately tells the user which location the tag was just read. Precise positioning of the tags solves the problem of mutual interference and crosstalk. Now, TAP is compatible with dozens of RFID readers, which solves the problem of a heterogeneous platform. Sima Cong said.
At the same time, TAP supports all major commercial software, including ERP software, or system software from companies such as Oracle, SAP, IBM, and Microsoft. If enterprise users need to develop their own applications, you can also use the development kit provided in TAP, corresponding to each application software developed by yourself, which can also solve the problem of data integration.
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