Radio frequency label based on position information and anti-conflict method
A technology of radio frequency identification tags and location information, applied in the field of radio frequency identification tags
Inactive Publication Date: 2009-05-27
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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At the same time, it can be used with other anti-collision algorithms
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[0041] figure 1 It is a schematic diagram of the system, which is composed of a card reader and a tag. The antenna connected to the tag is equivalent to a voltage source and a radiation resistor. After parallel inductance matching is performed on the tag, the energy received by the tag is:
[0042] P tag = AQ ( λ 4 πd ) 2 - - - ( 1 )
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The present invention belongs to the field of radio frequency identification tag collision-proof technology. It is characterized by that the initial communication rate set by card-reader is less than the rate of normal protocol communication made by tag and card-reader, its value is dependent to the time difference from that card-reader sends signal to that the returned signal of tag is received, after the signal sent by card-reader is received by tag whose distance is most near, said tag can most quickly return signal, so that the communication rate can be defined, under said communication rate other tags can not normally work or return signal, therefore the collision between tags can be prevented. Said invention also provides a radio frequency identification tag based on position information. Said tag includes antenna, distance conversion returned signal time delay circuit, second digital circuit and modulation-demodulation circuit.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification tags and relates to the problem of tag anti-collision. Background technique [0002] The first application of RFID in history can be traced back to World War II (about 1940), its function at that time was to distinguish enemy aircraft from our aircraft. By the end of the 1970s, the US government transferred RFID technology to civilians through the Los Alamos Science Laboratory. The first commercial application of RFID technology was in livestock. In the 1980s, several companies in the United States and Europe began to produce RFID tags. Now RFID technology has been widely used in various fields, such as logistics, access control, aircraft security, car anti-theft and so on. Many international companies such as Microsoft, IBM, TI, and Fujitsu have already participated in the research and development of RFID software and hardware technology. RFID will be a huge market in th...
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IPC IPC(8): G06K19/073G06K7/00
Inventor 刘忠奇孙旭光张春李永明王志华
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN