A uhf RFID relative positioning method based on multi-reference rssi profile
A relative positioning, multi-reference technology, applied in the field of radio frequency identification, can solve the problems of increasing system cost, complexity and calculation amount, restricting promotion, and difficulty in obtaining positioning accuracy with absolute positioning technology.
Active Publication Date: 2020-07-10
TIANJIN POLYTECHNIC UNIV +1
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Problems solved by technology
If absolute positioning technology is used in the above scenario, once the upper boundary of the positioning error exceeds the average distance between adjacent tags, a "wrong sequence" phenomenon will occur. Since most absolute positioning technologies are difficult to obtain centimeter-level positioning accuracy, the above "wrong sequence" " phenomenon is more serious in the application scenario of tag intensive deployment
In addition, a few absolute positioning algorithms can obtain lower positioning error boundaries, but the system construction and positioning algorithms rely on dedicated hardware facilities (such as software radio peripherals) or densely deployed reader antennas, etc. The above conditions increase the cost and complexity of the system and the amount of calculation, which limits its promotion in relative positioning scenarios
Method used
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Embodiment Construction
[0021] First, build a passive UHF RFID positioning system based on passive UHF RFID tags and high-performance UHF RFID readers, with the goal of improving the reading performance of the positioning system, and based on the popularity of the market, choose dipole antennas as tags For the antenna, the microstrip antenna is selected as the reader antenna, and the tag antenna gain estimation model and the reader antenna gain estimation model in the discrete state are obtained according to the classical electromagnetic field theory.
[0022] Such as figure 2 Shown is a schematic diagram of the coordinate system of the dipole tag antenna. Assuming that the antenna size satisfies the "half-wavelength" condition, its gain estimation model can be described as
[0023]
[0024] Among them, O T Constitute a ray vector with a point A in space θ T is the Z-axis to ray vector to the angle, φ T is the ray vector After projecting on the XOY plane, the X axis goes to the corner of...
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The invention belongs to the field of radio frequency identification, and relates to a UHF RFID relative positioning method based on multiple reference RSSI profiles. The method aims at processing a relative positioning problem of a tag of a passive UHF RFID system, and comprises the following steps of acquiring a tag antenna gain estimation model and a reader antenna gain estimation model in a discrete state; constructing an RSSI high-precision estimation model of a reverse scattering signal in a simultaneous state in order to obtain a reference RSSI profile set; adopting a dynamic time warping algorithm to obtain an optimal path consumption value set, and arranging elements in the set in an ascending order in order to complete the relative position estimation of a passive tag. The methodhas the advantages that the disordering phenomenon caused by the fact that the tag is adopted to read peak time as the position evaluation basis is effectively avoided, and the requirements for highprecision and low cost in the relative positioning application scene can be met.
Description
technical field [0001] The invention belongs to the field of radio frequency identification and relates to a UHF RFID relative positioning method suitable for multi-reference RSSI profiles. Background technique [0002] As a non-contact automatic identification technology, Ultra High Frequency Radio Frequency Identification (UHF RFID) uses radio frequency signals to realize information interaction between tags and readers, with short delay, low cost, non-visual In recent years, it has been successfully applied in many fields such as industrial automation, commercial automation, and transportation control management. Especially in indoor positioning application scenarios, the ideal UHF RFID positioning system can obtain decimeter-level positioning accuracy, showing huge development potential and practical value. [0003] In the positioning system based on UHF RFID, the position information of the target can be expressed in two forms: absolute position and relative position. ...
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IPC IPC(8): H04W64/00H04B17/318H04W4/80
CPCH04B17/318H04W4/80H04W64/006
Inventor 史伟光曹晓伟王薇赵靖曹宇
Owner TIANJIN POLYTECHNIC UNIV