Indoor positioning method, device and system based on RFID (radio frequency identification)

Abstract

The embodiment of the invention discloses an indoor positioning method, device and system based on RFID (radio frequency identification). The method comprises the following steps of controlling an RFID antenna to rotate at the preset angle; obtaining the rotating angle of the RFID antenna for rotating to the current position; scanning a label; obtaining the label signal intensity corresponding to the rotating angle; determining a first elliptic equation and a second elliptic equation corresponding to the label according to the rotating angle, the label signal intensity and the rotating antenna positioning algorithm; processing the first elliptic equation and the second elliptic equation according to the elliptic intersection point calculation algorithm to obtain the corresponding two elliptic intersection points; whether the distance between the intersection point and the origin is greater than the first preset distance or not; if so, the intersection point is output; otherwise, the rotating angle when the RFID antenna rotates to another position is continuously obtained, and the cyclic operation is performed until the final intersection point is obtained. The embodiment of the invention has the advantages that only one RFID antenna is used; the advantages of simple system structure, low cost, low deployment difficulty and high hardware utilization rate are realized.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of indoor positioning, in particular to an RFID-based indoor positioning method, device and system. Background technique [0002] With the rapid development of LBS (Location Based Service, location-based service) and O2O (Online To Offline, online to offline), positioning technology has also attracted attention and developed rapidly in recent years. Indoor positioning in positioning technology can be used in logistics, e-commerce, public security events, etc. [0003] Indoor positioning refers to the positioning of people or objects in an indoor environment. By arranging base stations everywhere in the room, users can generate information including distance and signal strength in the base station by means of mobile phones and other tools, and determine the user's position based on this information ( or moving track) to realize the monitoring and management of personnel and materials. ...

AI Technical Summary

Problems solved by technology

In the positioning method based on RSSI ranging in the prior art, because under ideal conditions, the signal strength is negatively correlated with the distance between the tag and the reader, so the possible position track of the tag can be uniquely confirmed through the signal strength. , each tag obtains the corresponding signal strength under the scanning of three or more RFID antennas, so as to obtain three or more trajectories respectively, and a certain point where three or more trajectories intersect is the tag position. Need to use three or more RFID antennas to locate a single tag, so a large number of RFID antennas are required, which increases the system cost, increases the difficulty of deployment, and the hardware utilization rate is low

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