Design Of Three-Dimensional Indoor Positioning System Based On Space Positioning Model

With the continuous expansion of wireless sensor networks and mobile communications,the location service industry has developed rapidly.Nowadays,navigation and positioning technology not only plays a huge role in traditional aviation,aerospace,navigation,surveying and mapping,etc.,but has entered people's daily work and life with the rise of GPS(Global Positioning System)technology.However,GPS positioning solutions cannot achieve good results indoors because the complexity of the indoor environment and the seriousness of GPS signal occlusion.Therefore,indoor positioning technology has become a hot research direction in the field of positioning and navigation research.The demands for location-aware services continue to increase in many indoor environments,such as underground garages,hospitals and nursing homes,shopping malls,supermarkets and warehousing,with the rapid development of modern information science and technology and the large-scale expansion of indoor positioning application scenarios.At the same time,the demand for realizing three-dimensional positioning in space was born.However,the particularity and complexity of the indoor environment have also led to the problems of low positioning accuracy,limited computing resources on mobile terminals,and expensive equipment required to achieve relatively accurate positioning accuracy in the research of 3D indoor positioning technology,which is difficult to promote and apply.This paper proposes a dynamic weighted centroid positioning algorithm based on the spatial positioning model,and designs a three-dimensional indoor positioning system based on this algorithm and Bluetooth low energy technology to solve the above problems.The main research contents are as follows:1.A dynamic weighted centroid positioning algorithm based on the spatial positioning model is proposed.Based on the traditional weighted centroid positioning algorithm and spatial positioning model,the algorithm effectively improves the dynamic selection of reference nodes and the optimization of the weight value.positioning accuracy.2.The low-power Bluetooth technology is used for positioning,and the Bluetooth gateway is used to receive data from the positioning tag in real time,which reduces the cost requirements of the system while ensuring positioning accuracy.Simulation results show that under the premise of three-dimensional indoor positioning,the algorithm proposed in this paper has a maximum error of 0.85 m and an average error of 0.48 m,achieving high accuracy,and the average algorithm processing time is 0.026 s,which ensures the real-time performance of the positioning algorithm.3.A three-dimensional indoor positioning system is built,and the laboratory is used to simulate the internal shelf area of the factory.It can meet the positioning accuracy requirements to a certain extent and complete the verification of the algorithm: the experimental results show that the actual selected test points are affected by Multipath propagation and signal processing errors have relatively low positioning accuracy at corner tables and chairs.The maximum positioning error of the test point is 1.05 m,and the average error is 0.69 m.The development of this system provides a reference for the application of 3D indoor positioning technology.It can be used in warehouse management and other occasions to meet high precision and low-cost system requirements.