Study Of Wireless Inertial Sensor Ad Hoc Network Technology In The Field Of Indoor Positioning

Indoor positioning and navigation gradually become an indispensable tool in people's life.With the development of wireless sensor network technology,a variety of indoor positioning and navigation systems spread out.The real-time perception of the current position of the staff is the focus of current researchs.The transmission distance of communication terminals,the capability of wall-piercing and the ability to adapt to complex communication environment are the difficulties of these researchs.Based on the advantages of some personnel positioning systems,this thesis studies and designs an indoor positioning scheme of wireless mesh network and inertial sensor,combines the advantages of inertial sensor and wireless ad hoc network to solve the key problem of personnel locating in indoor airtight environment.It improves the operation and stability of constructing the network and has great theoretical significance and practical application value.By comparing the advantages and disadvantages of wireless sensor network technology at home and abroad,this thesis proposes a polling communication protocol to solve the problem of data conflict and interference during the transmission and reception of multi-channel communication.Based on the requirements of mobile ad hoc network and the characteristics of wireless mesh network,a dynamic multipath routing protocol is used to establish a positioning network with adaptive step estimation algorithm,attitude fusion algorithm and extended kalman filter.According to the theory of wireless sensor ad noc network,this thesis chooses the 433 MHz band communication mode for data transmission and establishes the layered structure of the location network.The dynamic multipath routing protocol is selected according to the routing characteristics of mobile ad hoc network.Then the wireless relay scheme is proposed,which is used to transmit the wireless signal.It solves the problem of the personnel locating in the closed environment and also provides a greater network coverage and stronger network stability.Based on the requirement of locating network,the indoor positioning scheme and the showing interface on computer are developed and designed,including the software and hardware platform of locating nodes,relay and receiver nodes.This thesis tests and analyzes the network performance of the positioning scheme from the time and distance of communication and the ability of spreading through the wall.Result shows that the network capability of the indoor location networks is strong,and the distance and time of communication are all meet requirement of practice.This thesis also tests the positioning system in the multi-layer corridor and airtight space using the interface on computer.The result shows the positioning error is less,the time of single hop and multi-hop relay is less than 300 ms,so that the positioning system can realize the real-time localization of many indoor people.It can meet the requirement of instant data exchange and stable network running under different environment,showing the feasibility and reliability of the scheme.