RFID indoor multi-target 3D positioning system and method based on carrier phase

Abstract

The invention provides an indoor multi-target 3D (three-dimensional) positioning system and an indoor multi-target 3D positioning method based on radio frequency identification (RFID) and a carrier phase, and relates to the technical field of RFID and indoor positioning. In order to solve the technical problems of timeliness and precision of indoor multi-target positioning, a positioning platform is built by means of the technical advantages of radio frequency identification (RFID), positioning targets are distinguished by means of passive tags, a positioning problem is converted into an optimization problem, and by fusing the direction finding principle of a multi-signal classification (MUSIC) algorithm, the multi-carrier phase distance measurement principle and the particle swarm optimization (PSO) algorithm, the positioning accuracy of the indoor multi-target positioning is improved, and the positioning accuracy of the indoor multi-target positioning is improved. According to the method, a joint particle swarm optimization (JPSO) algorithm is proposed, the retrieval process of direction finding and distance measurement is omitted, the dependence of the positioning precision of the PSO algorithm on the number of iterations and the number of particle swarms is reduced, and multi-target synchronous positioning is directly realized. The invention provides an effective indoor multi-target rapid high-precision positioning model, the system structure is simple, the deployment is convenient, and the positioning service can be provided in most typical indoor environments.

Description

technical field [0001] The present invention relates to the field of radio frequency identification (Radio Frequency Identification, RFID) and indoor positioning technology, in particular to an RFID indoor multi-target 3D positioning system and method based on carrier phase. Background technique [0002] With the development of the times, there are more and more large building groups such as shopping centers and logistics centers, and the indoor space is gradually increasing, and the demand for indoor positioning services is also increasing. Therefore, indoor positioning systems and methods have become research hotspots in recent years. But for now, indoor positioning faces many challenges. First of all, due to the influence of building walls, indoor satellite signal attenuation is serious, resulting in poor effect of satellite-based conventional positioning services such as the Global Positioning System (GPS) in indoor environments; secondly, even if the indoor space is lar...

AI Technical Summary

Problems solved by technology

First of all, due to the influence of building walls, indoor satellite signal attenuation is serious, resulting in poor effect of satellite-based conventional positioning services such as the Global Positioning System (GPS) in indoor environments; secondly, even if the indoor space is larger than before A lot, and it is impossible to deploy a large-scale antenna array like an outdoor environment, so the indoor positioning system needs to consider the size of the floor area and the difficulty of deployment; thirdly, according to different usage environments, the indoor positioning system may need to be difficult to carry for people or books. Power source targets and small objects are positioned, which means that the positioning target may not be able to carry signal source equipment such as antennas, so that the positioning system cannot use WiFi and other common technologies for locating signal sources; finally, there may be multiple indoor positioning targets. , if the traditional geometric positioning is used to complete the positioning of multiple targets in sequence, the timeliness of the system will drop sharply

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