Target location method in specific environment and based on active radio frequency identification device (RFID) and system thereof

Abstract

The invention discloses a target location method in specific environment and based on an active radio frequency identification device (RFID) and a system thereof, which adopt the mode of time inversion, are capable of conducting real-time high-accuracy location on an active RFID label on the premise that indoor environment is not modified, conduct simulation of the communication process of electromagnetic wave after the time inversion in a simulation environment, determine the position of a target to be located by reading peak value of energy of an electromagnetic field, and overcome the shortcoming that the traditional location accuracy relies on complexity of environment. The time inversion process is not finished on the target to be located, so that complexity and cost of the target to be located are reduced. A real transmitter is not required, so that complexity and cost of a signal processing mechanism are reduced. The simulation environment built in the signal processing mechanism corresponds to the real specific environment, and the multi-diameter and multi-scattering conditions can all be fully utilized in the time inversion process. Compared with the prior location mode, the method and the system reduce arrangement number of fixed antenna and reduce system cost.

Description

Technical field [0001] The invention relates to a positioning method and system, in particular to a target positioning method and system based on active RFID in a specific environment. Background technique [0002] The demand for various location-based services in the indoor environment is increasingly urgent. Real-time positioning of items in the logistics field is conducive to improving the management level of logistics; real-time positioning in the public security field is conducive to maintaining social safety; in daily life , Can help people understand the status of children, pets, objects, etc. However, with existing satellite positioning systems, in indoor environments or densely built areas, satellite signals are blocked by obstacles, making it difficult to locate effectively. In addition, indoor positioning technologies include infrared technology and ultrasonic technology, but the signal needs line-of-sight propagation. The positioning range is relatively limited. Rad...

AI Technical Summary

Problems solved by technology

Chinese invention patent (application number 200910051180.5) discloses an RFID indoor positioning system and technology. The invention adopts a short-range RFID reader and antenna placed on the robot chassis, and a passive RFID tag is placed on the ground of the robot's movement area as positioning. For reference, the positioning of the mobile robot is realized by reading the information in the RFID tag through the RFID reader, but this method needs to arrange tags in the movement area in advance, which will cause a certain degree of damage to the indoor environment and is inconvenient to implement

[0003] Chinese Invention Patent (Application No. 201110005728.X) discloses a real-time positioning system, which draws the tag movement trajectory and calculates the moving speed according to the order, information intensity value and time difference of the tags read by several adjacent RFID base stations , for indoor positioning, the signal will experience reflection and refraction of obstacles during the propagation process, resulting in multiple propagation paths of the signal. In the case of serious multipath, the positioning accuracy of this positioning method is greatly reduced

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