Ultrahigh frequency RFID label accurate positioning method based on label coupling effect
An RFID tag and precise positioning technology, which is applied in the field of ultra-high frequency RFID tag precise positioning, can solve the problems of GPS signal attenuation, high equipment cost, and low positioning accuracy, so as to improve positioning accuracy and efficiency, smoothness and denoising Good, to solve the effect of random error
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[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] The present invention is accomplished through following four steps:
[0037] Step 1) modeling label coupling;
[0038] In order to explain the interference phenomenon caused by coupling between RFID tags, the present invention studies the design of the tag antenna and the equivalent circuit of the antenna, models the phenomenon, and analyzes the scattering power of the tag pair.
[0039] The antenna design of the UHF passive tag is related to the working frequency of the tag and the way of communication between the tag and the reader. The tag uses backscattering technology to return energy to the reader antenna, and modulate information such as ID in the signal. Usually, the tags adopt the design method of half-wave dipole antenna. Since the working wavelength of the UHF tag is about 32 cm, the length of the half-wave dipole antenna is 16 cm, and this length i...
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