Ultrahigh-frequency passive radio-frequency identification reader
A passive radio frequency and ultra-high frequency technology, applied in electromagnetic radiation induction, transmission system, electrical components, etc., can solve the problems of easy to be maliciously tracked and interfered, and multiple readers are easy to collide with each other, so as to simplify circuit design, The effect of preventing collision
Inactive Publication Date: 2011-07-06
成都三零盛安信息系统有限公司
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[0005] 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 interference provides an ultra-high frequency passive radio frequency identification reader with a simple structure, which can effectively overcome the collision between multiple readers in the same area, and is easily interfered by malicious tracking
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[0032] Such as 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 statistical test, but be...
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The invention discloses an ultrahigh-frequency passive radio-frequency identification reader, which mainly comprises a frequency synthesizer, an upper frequency conversion mixer, a lower frequency conversion mixer, a receiving separator and a transmitting separator, wherein the upper frequency conversion mixer and the lower upper frequency conversion mixer are connected with the frequency synthesizer respectively; and the receiving separator and the transmitting separator are connected with the frequency conversion mixer and the lower upper frequency conversion mixer respectively. The ultrahigh-frequency passive radio-frequency identification reader is characterized in that the frequency synthesizer is also connected with a real random number generator. According to the invention, the frequency hopping is controlled by the real random number generator and a work channel of each frequency hopping is decided by the real random number. The real random number is not generated by an algorithm but originates from the physical randomness, so that the random number has the unpredictability. By using the invention, the defect that the general ultrahigh-frequency passive radio-frequency identification reader adopting the frequency hopping of the pseudo random number is easy to collide in the same area is overcome. Meanwhile, the defects that the general radio-frequency identification reader adopting the frequency hopping of the pseudo random number is tracked and intervened with hostility easily are overcome.
Description
[0001] This application is a divisional application. The application number of the original application is: 200910060311.6; the application date: August 10, 2009; the name of the invention: an ultra-high frequency passive radio frequency identification reader and its frequency hopping method. technical field [0002] The invention relates to a radio frequency identification reader, in particular to an ultra-high frequency passive radio frequency identification reader. Background technique [0003] 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 sligh...
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IPC IPC(8): G06K7/10H04B1/713
Inventor 徐凌云
Owner 成都三零盛安信息系统有限公司
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