| Nowadays,intelligent mobile terminal technology,Internet mobile technology and mobile computing technology are in a period of rapid development,and more and more users have put forward more demands for indoor location service.Indoor positioning technology has gradually developed into a hot issue in the field of intelligent positioning service,and more experts and scholars have explored and studied it.At present,research institutions and the most influential companies in the field of science and technology,such as Apple,Google,Baidu,etc.,have invested a lot of money and research and development efforts to study indoor positioning technology when dealing with the "last 100 meters" and "last kilometer" of positioning and navigation services.Common indoor positioning technologies in people's life include guide,navigation and shopping guide,etc.,which have been integrated into People's Daily life.In particular,the "Xi He Plan",an indoor project in conjunction with the "Beidou" positioning and navigation project,aims to improve the accuracy of indoor positioning in a wide range of areas,fully demonstrating the state's support for this field.Compared with outdoor space,indoor entity composition and structure are more complex,and it also has problems such as blocking positioning signal,non-line-of sight transmission,multi-path transmission,etc.,resulting in serious errors in wide-area signals,such as FM/GSM/GPS.Based on local signal radio frequency positioning technology,the positioning accuracy can be accurate to less than five meters,and its typical representatives are Wifi,Bluetooth,RFID,etc.Combined with acceleration sensor,gravity sensor,geomagnetic sensor and other full positioning source hybrid positioning mode,to improve the positioning accuracy.However,this positioning method will increase the power loss of the positioning terminal,reduce the continuous service capacity of the system to users,and increase the cost of comprehensive capacity.The main factor leading to indoor problems is that indoor signal transmission is restricted by the particularity of indoor environment,and there is a big gap between indoor high efficiency demand and high precision,which is also a contradiction that has not been effectively dealt with at present.Based on the study of indoor structure,a high-precision attenuation model and a positioning signal transmission model were constructed,which obtained higher positioning accuracy through theoretical analysis.However,no breakthrough was made in practical application.In this paper,smart phones are selected as the platform.Based on bluetooth technology and other technologies with low power consumption,low cost and strong applicability,indoor space scenarization measures are adopted for analysis,and the research goal is to optimize indoor positioning.Through the research,it is concluded that indoor positioning technology is the most ideal application in the actual space environment constraints.This indoor positioning method has higher stability and positioning accuracy,and meets the requirements of indoor pedestrian positioning cost,accuracy and power consumption.The following is a brief description of the research contents and achievements.1.Preliminarily formulate the indoor positioning mode of spatial scene constraints.(1)Starting from optimization mode,prerequisite,optimization algorithm and realization of positioning,etc.,the positioning optimization architecture,important technical measures and module composition in the scene constraint room are comprehensively discussed and analyzed,which involves selecting the optimal RSSI trusted beacon,optimizing RSSI real-time data filtering and scene constraints,etc.;(2)Interior positioning method based on spatial semantic constraints is designed.The experimental data show that the indoor location algorithm,model and technology of spatial semantic constraint studied in this paper are more effective and accurate.2.Establish the mobile Phone Bluetooth indoor positioning system based on spatial semantic constraints.(1)In this paper,the indoor positioning technology which has been widely used in the market is sorted out,and the research results are optimized,compared with anchor points,corrected maps,and GIS constraints and other positioning constraint methods are optimized.On this basis,spatial constraints of point,line and plane of indoor positioning are classified.Optimize the interior space positioning process,simplify the positioning process,and study the positioning switching methods under traditional space scenes.(2)The implementation can correspond to physical entities in position,and limit the positioning process in containers and channels.During the study of this topic,pedestrians in the indoor space are mainly positioned.Based on the positioning of i Beacon signal source,this signal source is characterized by strong applicability,low input cost,and focuses on the research process,research methods adopted and research results obtained.The positioning source sensor on the hardware device USES i Beacon product manufactured in the industrial field,and the selected smart phone is Samsung S8,Hammer Nut Pro,Xiaomi Mix2,etc.;The initial location model of Bluetooth is based on the spatial multi-lateral algorithm model.Real-time RSSI values were processed by mean filtering method.The final research results show strong general applicability and are easier to popularize and apply later. |
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