Development Of An Indoor Location Demomstration System Based On LFMCW

Indoor location technology is constantly integrated into people’s lives,and it will enrich people’s lives.The indoor location technology based on LFMCW has the advantages of low cost,high precision and high stability and so on,and it has been the focus of research at home and abroad.Aiming at the demand of indoor location demo system based on LFMCW,this thesis studies the relevant indoor location technology based on LFMCW,designs the system scheme,and design prototype to verify the effectiveness of the indoor location demo system.The main tasks include:1.The common radio indoor location methods are analyzed and compared,and the common synchronization techniques in radio indoor location are introduced.Combining the characteristics of LFMCW indoor location technology,the thesis studies and analyzes the indoor location technology of synchronous LFMCW.2.Based on the indoor location technology of synchronous LFMCW,this thesis puts forward a forward type LFMCW indoor location technology based on fdma-like scheduling without synchronization.This thesis analyzes it’s distance measurement,velocity measurement,multi base station forwarding and multipath performance.Finally,the influence of the frequency drift of the crystal oscillator on the distance measurement precision is analyzed theoretically.3.The thesis puts forward the technical scheme of the forward type LFMCW indoor location system,which includes the system requirements and technical parameters,the overall scheme design of the system,and the analysis and simulation of the performance.Finally,the base station and the label were tested and analyzed,and the wired and wireless test was carried out.4.According to the design of the technical scheme,designed the base station and lable of the system respectively,and the system prototype is developed,and the effectiveness of the ranging and positioning function of the demo system is verified experimentally.