Development And Research Of Location Node Based On Ultra-Wide Band

Positioning technology is divided into outdoor positioning and indoor positioning of the two categories.At present,the outdoor positioning accuracy and GPS support,technology has become increasingly mature.For example,GPS plays a significant role on the vehicle navigation,bike-sharing(such as ofo,mobike and etc.)and logistics monitoring system.As for the indoor positioning technology,due to the complex indoor environment and a variety of obstacles,the development of high-precision indoor positioning technology is facing many bottlenecks.This paper is devoted to the research of indoor positioning technology based on UWB,which has the advantages of low power consumption,high resolving power,strong anti-interference ability and so on.In this paper,the realization of the UWB signal and the pulse waveform and modulation spread spectrum are analyzed.At the same time,this paper established a software and hardware platform based on UWB positioning system,And the circuit principle diagram of each node are introduced,especially the UWB signal transceiver module and the main control part.And the whole hardware circuit is installed and debugged to ensure the stability of the whole system.The development process of the software development platform is described,and the communication process of the UWB signal,and the influence of the preamble,the channel and the pulse repetition frequency(PRF)parameters of the UWB signal on the whole ranging and positioning system is studied.At the same time,the interface of the positioning system is made in order to realize the data display and real-time monitoring,and provide the data basis for the following experiment.In the end,the paper compares several widely used location algorithms,and the centroid localization algorithm based on the three edge location is further improved.At the same time,the simulation experiment and the actual environmental conditions are tested,and the accuracy of the centimeter level ranging is obtained.The feasibility of the UWB indoor positioning system is verified.