一种无线网络时钟同步法的超声波室内定位系统设计  

A Design of Ultrasonic Indoor Positioning System Based on Time Synchronized Wireless Network

作　　者：李金奎[1] 冯晋[1] 陈剑桥 LI Jinkui;FENG Jin;CHEN Jianqiao(Yangzhou Polytechnic College,Yangzhou 225009,China)

机构地区：[1]扬州市职业大学,江苏扬州225009

出　　处：《现代雷达》2022年第3期76-80,共5页Modern Radar

基　　金：扬州市2018市级计划-市校合作专项资助项目(YZ2018144)。

摘　　要：基于无线网络时钟同步法的超声波室内定位系统,提出了一种将超声波发射器和接收器件分离,并配置到2.4 GHz无线网络中,实现发射器和接收器之间的时钟同步和数据交换的定位方法。移动目标发送无线同步信号,延时后发出超声波,经硬质反射锥全向发射超声波信号。各信标单元收到无线同步信号后,延时启动定时器计时,当各信标单元收到超声波信号后停止计时,得到移动目标到各信标单元的超声波传送时间值。移动目标根据需求,取各信标单元的时间值,经过算法得到移动目标的坐标。通过上述手段,将超声波飞行时间减少了一半,扩大了有效测量范围,避免多径效应带来的干扰,提升室内定位系统的范围和精度。经过原型实验系统验证,在15 m左右的范围内,定位精度可以达到1 cm~5 cm,是室内定位系统的优选方案之一。A positioning method is put forward in the ultrasonic indoor positioning system based on time synchronized wireless network, which proposes the separation of the transmitter and the receiver and places it in the 2.4 GHz wireless network, thus achieving the synchronization of the transmitter and the receiver and data exchange. Synchronized wireless signals are sent by mobile targets and ultrasound waves are emitted after a delay, and which later are sent in all directions by reflection cone. After receiving wireless signals, beacon units delay the start of timer, which don′t stop until after receiving all ultrasound waves signals. The transmission time of ultrasound waves from the mobile targets to beacon units are recorded. In terms of requirements the coordinates of mobile targets are calculated according to the time values from beacon. In this way, flight time for ultrasound waves are decreased in half and the ranges of effective measurements are expanded, which avoid the interference caused by multiple path effect and enhance the scope and precision of indoor positioning system. It is verified by prototype testing, whose positioning accuracy could reach 1~5 cm within 15 meters. Therefore, this design is a preferable program for indoor positioning system.

关 键 词：超声波定位 室内定位 无线网络 

分 类 号：TN929.5[电子电信—通信与信息系统]