Passive ultrahigh frequency RFID relative positioning method based on phased array reader antenna
A phased array antenna, relative positioning technology, applied in advanced technology, climate sustainability, sustainable communication technology, etc., can solve problems such as poor robustness, increased dependence, and ranking deviation.
Pending Publication Date: 2022-07-12
TIANJIN POLYTECHNIC UNIV
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In order to obtain the profile information of the phase or receiving field strength, the reader antenna usually needs to be mounted on a mobile device, which further increases the dependence of the system on the environment and the site; 3) OTrack and STPP use the receiving field strength profile and phase The timestamp information of the highest point of the contour is used as the basis for positioning, but the above-mentioned single-point timestamp data is less robust to noise, which can easily cause sorting deviations
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[0024] like figure 2 As shown, the reader antenna selects the phased array antenna, constructs the radiation scene of the phased array antenna, selects the space rectangular coordinate system, and establishes the reader phased array antenna gain expression model according to the electromagnetic field theory: G R (θ R , φ R )=eD(θ R , φ R ), where G R (θ R , φ R ) represents in the radiation direction (θ R , φ R ) on the reader antenna gain, D(θ R , φ R ) is the directivity coefficient, and can be expressed as where S(θ R , φ R ) is a matrix factor and can be expressed as In the above phased array antenna gain model, the phased array antenna is on the YOZ plane, the center of mass of the antenna is on the origin O, the normal direction coincides with the positive direction of the X axis, and point O and point A in space form a ray vector is the radiation direction, θ R means from arrive The angle of inclination, φ R means from arrive Rotation angle b...
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The invention belongs to the technical field of mobile communication, and relates to a passive UHF RFID relative positioning method based on a phased array reader antenna. The method comprises the following steps: establishing an ultrahigh-frequency RFID relative positioning scene based on a phased-array antenna, deducing to obtain a gain expression of the phased-array antenna, obtaining an ideal profile of receiving field intensity under a simulation condition, correcting an actually measured field intensity profile by using the ideal profile, and evaluating the corrected profile to realize relative positioning of a tag by adopting a relatively steepness size. The method is characterized in that relative positioning is carried out by using the phased-array antenna, the requirements of the system for the environment and the site are reduced, and the problem of sorting errors caused by taking a single-point timestamp as a positioning basis can be improved by using a position discrimination method based on contour steepness; and the requirement of a user on relative positioning of the tag array under a passive ultrahigh frequency RFID system can be met.
Description
technical field [0001] The invention belongs to the technical field of mobile wireless communication, and relates to a passive ultra-high frequency RFID relative positioning method based on a phased array reader antenna. Background technique [0002] Ultra High Frequency Radio Frequency Identification (UHF RFID) technology, as one of the key technologies in the Internet of Things industry, has been widely used in many fields such as industrial automation, commercial automation, and transportation control management. In production and life, there are many scenarios, such as book management, warehousing logistics, indoor navigation, etc., that need to identify and locate the target. A typical passive UHF RFID positioning system mainly uses the unique identification characteristics of electronic tags to measure the spatial position of items according to the reception strength of radio frequency communication between the reader and the tag installed on the object, and is mainly ...
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IPC IPC(8): G06K7/10G06F30/20
CPCG06K7/10099G06K7/10346G06F30/20Y02D30/70
Inventor 史伟光张佳瑞王薇
Owner TIANJIN POLYTECHNIC UNIV