Real-time location method and system based on radio frequency identification of mobile communication terminal

Abstract

The invention discloses a real-time location method and a system based on radio frequency identification of a mobile communication terminal. A transmitting function of a radio frequency identification locating signal extends in the mobile communication terminal, a reading function of the radio frequency identification locating signal is realized in an identification locating reader, the mobile communication terminal is communicated with the identification locating reader through wired and wireless communication networks and a network server, by adopting subcarrier modulation, direct sequence spread spectrum, code division multiple access, time division collision prevention and multi-system parameter calibration technologies, the interference between a multipath signal and multiple terminals of multiple readers, and the interference of the other wireless communication system can be effectively inhibited, the remote high-precision radio frequency identification location is realized, and the network server is utilized to carry out distributed interactive processing fusion of data information and network dynamic optimization configuration of communication parameters, so that the convenient, reliable, economic and flexible real-time location service application based on the mobile communication terminal can be provided for a user.

Description

technical field [0001] The invention belongs to the technical field of radio frequency real-time positioning, in particular to a method and system for real-time positioning based on radio frequency identification of mobile communication terminals. Background technique [0002] Radio frequency real-time positioning system (RTLS) refers to a system that continuously and dynamically determines the physical position of a target in a set working area through radio frequency wireless communication technology. Its basic working principle is to transmit and monitor the characteristic parameters and data of the returned radio frequency signal information to obtain the physical location information of the target. Radio frequency real-time positioning systems can be divided into two categories: satellite-based positioning and land-based positioning. Satellite-based positioning systems that have been put into use or are under construction include GPS global positioning system, BDS Beid...

AI Technical Summary

Problems solved by technology

In related research, there are mainly three existing positioning technologies based on independent universal UHF RFID systems. The first is the positioning of reader base stations. By arranging a large number of readers, it is determined which readers the tags to be located are within the reading range of. Proximity positioning is realized according to the position of the reader. Although the system is technically easy to implement, the positioning accuracy is low and the construction cost is also high; the second is based on the backscatter signal strength RSSI positioning, and the reader detects the strength of the backscatter signal of the tag Estimate the distance from the tag to the reader to achieve positioning. Although the system is simple in structure and does not need to arrange a large number of readers, because the RF signal strength is affected by the complex propagation environment and multipath fading, it has the disadvantage of low positioning accuracy and is vulnerable to other wireless devices. The interference of the communication system; the third is based on the backscatter signal phase measurement and positioning. The reader estimates the distance from the tag to the reader by detecting the phase of the backscattering signal of the tag to achieve positioning, although in an ideal working environment a higher Positioning accuracy, but similar to RSSI-based positioning technology, the phase of radio frequency signals is affected by complex propagation environments and multipath fading. In practice, it also has the disadvantages of low positioning accuracy and being easily interfered by other wireless communication systems

In addition, the target information data to be located in the existing UHF RFID positioning system is statically solidified and stored, and only has a limited encryption security mechanism. The positioning communication parameters of the reader and the tag are also statically configured, and there is no overall performance optimization based on the positioning system network. mechanism

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