Research On Indoor Positioning Technology Based On LoRa

With the rapid development of Internet of Things(IoT)technology,location-based services(LBS)have quickly become one of the standard functions of mobile devices,and more and more researchers are focusing on personal navigation and positioning in indoor and outdoor environments.Among many Internet of Things technologies,LoRa technology has attracted a lot of attention and wide application because of its low cost,low power consumption,long distance and strong network scalability.Therefore,the application of LoRa technology for indoor positioning has great practical significance.This thesis studies the three-dimensional positioning technology of targets in LoRa networks.Based on the research of LoRa and several mainstream positioning technologies,the three-edge positioning method based on received signal strength(RSSI)is selected to design the positioning system.The three-edge positioning method is optimized by weighting method.The region solves the environmental parameters and optimizes the accuracy by using Gaussian filtering and mean filtering to optimize the RSSI value.The positioning system designed in this paper includes three parts: LoRa nodes' hardware platform,nodes' software platform and positioning management software used on computer.The hardware platform of the LoRa network nodes is based on the SX1278 chip,including the MCU,chip,circuit and antenna.The nodes' software platform is developed in the software development environment which developed by the company that produce Arduino modules.The paper introduces in detail the functions and program flow of each type of node in the LoRa network.The positioning management software is developed under the QT Creator environment.This paper gives the detailed design scheme of the positioning management software and its realized functions.At the end of this thesis,the positioning system designed here is tested and the experimental results are analyzed.The results show that the system achieves the function of three-dimensional positioning.At the same time,this thesis points out the shortcomings of the system and the direction of following researches.