Ultrahigh frequency passive radio frequency identification reader and frequency hopping method thereof

A passive radio frequency and ultra-high frequency technology, applied in the direction of instruments, inductive record carriers, electrical components, etc., can solve the problems of being easily interfered by malicious tracking, and multiple readers are prone to collide with each other, so as to simplify circuit design and prevent The effect of collision

Inactive Publication Date: 2010-01-06
成都三零盛安信息系统有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the pseudo-random number that exists in the pseudo-random frequency hopping method of the current UHF passive radio frequency identification reader. The defect of tracking interfere

Method used

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  • Ultrahigh frequency passive radio frequency identification reader and frequency hopping method thereof
  • Ultrahigh frequency passive radio frequency identification reader and frequency hopping method thereof
  • Ultrahigh frequency passive radio frequency identification reader and frequency hopping method thereof

Examples

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[0031] Example

[0032] like figure 1 As shown, the existing UHF passive RFID reader is composed of a frequency synthesizer 1 , an up-conversion mixer 2 , a down-conversion mixer 3 , a transceiver separator 4 and a pseudo-random number generator 5 . When connected, the up-conversion mixer 2 and the down-conversion mixer 3 are respectively connected to the frequency synthesizer 1, and simultaneously, the up-conversion mixer 2 and the down-conversion mixer 3 are also connected to the transceiver splitter 4, And the transceiver splitter 4 is also connected with the antenna. According to actual needs, the transceiver splitter 4 can be a circulator or a coupler.

[0033] The existing frequency hopping method is controlled by a pseudo-random number. The so-called pseudo-random number refers to a data sequence recursively generated by the pseudo-random number generator 5 using a mathematical formula for a pre-selected seed. The data sequence can generally pass the random statistic...

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Abstract

The invention discloses an ultrahigh frequency passive radio frequency identification reader which mainly comprises a frequency synthesizer, an up-conversion mixer, a down-conversion mixer and a receiving-transmitting separator, wherein the up-conversion mixer and the down-conversion mixer are connected with the frequency synthesizer; the receiving-transmitting separator is respectively connected with the up-conversion mixer and the down-conversion mixer. The ultrahigh frequency passive radio frequency identification reader is characterized in that the frequency synthesizer is also connected with a true-random number generator. The invention also discloses a frequency hopping method of the ultrahigh frequency passive radio frequency identification reader. The true-random number generator is used for controlling frequency hopping, and a working channel of each frequency hopping is decided by the true-random number generator. Because a true-random number is not generated by calculating by an algorithm but comes from physical randomness, the true-random number has unpredictability. The invention effectively overcomes the defect that an ordinary ultrahigh frequency passive radio frequency reader adopting a pseudo-random number frequency hopping is easy to be inimically tracked and interfered.

Description

technical field [0001] The invention relates to a radio frequency identification reader, in particular to an ultra-high frequency passive radio frequency identification reader and a frequency hopping method thereof. Background technique [0002] The UHF passive radio frequency identification (RFID) system mainly includes two parts: the reader and the passive tag. Passive tags do not need batteries, but obtain energy from the electromagnetic waves emitted by the reader, and send data to the reader with backscattered radio waves, and the communication distance can reach about 10 meters. The air interface standards between the reader and the tag include ISO / IEC 18000-6A, 6B, 6C, etc. Different regions of the world have slightly different communication frequency ranges for UHF RFID systems, but they are all between 840 and 960MHz, and are divided into multiple communication channels. For example, the frequency range assigned by the FCC specification applicable to North America...

Claims

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Application Information

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IPC IPC(8): G06K7/00H04B1/713
Inventor 徐凌云
Owner 成都三零盛安信息系统有限公司
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