任宪洁,潘绍明,柯宝中

• 1:广西科技大学电气与信息工程学院

摘要(Abstract)：

介绍一种主要为室内定位提供测距基础的系统。该系统由两个对等的节点组成,节点1发送通过无线发出的同步握手信号,节点2收到同步信号后开始计时并回应握手信号,节点1确认握手成功后开始发送声波脉冲信号,节点2收到脉冲信号后停止计时,定时器的时间就是声波在空气中的传播时间,进而确定点和点之间的距离。节点主要是由声波发射接收电路、CC1100无线电模块和STC12C5A0S2单片机等组成。STC12C5A0S2内部带有捕获定时器的功能,能准确地抓住定时器的值。声波发射接收电路主要由NE555,LM386和NE5532构成,能高频喇叭发送和接收10.25 k Hz声波信号。系统在测试的过程中,随着距离的增大,误差会有所加大,在10 m范围内误差小于10%,可以满足定位测距的需求。在实际的应用过程中还可以通过系统标定等数据处理手段,进一步提高测量精度,满足更高的测距要求。

关键词(KeyWords)： 无线同步;声波测距;定位;节点;STC12C5A0S2;误差

Abstract:

Keywords:

基金项目(Foundation): 广西自然科学基金项目(2014GXNSFAA118392);; 广西教育厅资助项目(YB2014209)~~

作者(Author): 任宪洁,潘绍明,柯宝中

DOI: 10.16652/j.issn.1004-373x.2018.17.011

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