Ultra high frequency card dispenser for improving fault-tolerant capability for tag frequency offset

Abstract

The invention provides an ultra high frequency card dispenser for improving fault-tolerant capability for tag frequency offset. The ultra high frequency transmitter comprises a body and a master control board and an antenna board which are located in the body, the master control board comprises a CPU and a radio-frequency circuit connected to the CPU, the radio-frequency circuit is connected to the antenna board, and comprises a radio-frequency forward link circuit and a radio-frequency reverse link circuit, the radio-frequency reverse link circuit internally comprises an FPGA connected to the CPU, the FPGA internally comprises a filter and a demodulation module connected to the filter, the demodulation module comprises a shifting register, and current signal frequency is determined according to the demodulation module and a standard of judgment of a subsequent data bit width is adjusted. The ultra high frequency card dispenser for improving the fault-tolerant capability for the tag frequency offset has the advantages of being capable of conducting judgment and bit width adjustment on the frequency offset, enabling the card dispenser to recognize and read an electronic tag with serious frequency offset, improving the card dispensing success rate, and reducing the tag discarding rate.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to an ultra-high frequency card issuer for improving the error tolerance capability of frequency deviation of tags. Background technique [0002] The card issuer is an important part of building an RFID application system. It completes the operation of the specific content of the label, including creating files, reporting the loss, replacing the card, and correcting information. The card issuer is generally placed together with the terminal, and the card issuer operates on a single label. In essence, the card issuer is a small tag reading and writing device, which needs to be used in conjunction with tag management software. [0003] In the prior art, due to the inconsistency of mass-produced electronic tags, in special environments (such as high temperature and low temperature environments), individual relatively low-quality electronic tags will ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, due to the inconsistency of mass-produced electronic tags, in special environments (such as high temperature and low temperature environments), individual relatively low-quality electronic tags will have a large frequency deviation (frequency deviation) in the signal returned to the card issuer. 20% or more), generally existing card issuers can only read and report errors, but cannot identify tags with a frequency deviation of more than 20%, and there is no mechanism for adjusting the data bit width judgment standard, and it is impossible to write information to the tags

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