摘要
精确的位置信息是B3G移动通信系统实现普适计算功能的要求,提供位置信息的系统必须是低成本、低电子复杂性、放置方便和多目标定位的;系统由中心节点、超声波接收传感器节点和超声波发射信标节点通过无线通信链路构成定位网络;信标节点和多个传感器节点在中心节点通过无线通信链路的协同下分别测出超声波在它们之间的视距传播时间,进而依据已知的传感器节点位置和声速,利用最小二乘法计算出信标节点的位置;给出了本定位系统的组成框架、定位算法、基于nRF2401无线收发模块建立无线通信链路的MAC协议和超声波收发时间差的修正方案;本定位系统达到了设计目标,实验结果表明定位精度也满足应用要求。
The accurate location information provided by the positioning system with low cost, low electronic complexity, east deployment and multi targets positioning capability is required by B3G for its ubiquitous computing. The system consists of the centre node, the sensor nodes with ultrasound receiver and the beacon nodes with ultrasound emitter. With the control of the centre node, these nodes netted by wireless link measure the transmission time of the ultrasound from the beacon to each sensor. The beacon position is obtained via LSE algorithm, based on the known positions of sensors and the measurements. The architecture of this system, the positioning algorithm, the MAC protocol of wireless link organized by the nRF2401 transceivers, and a smart method to calibrate the transmission time of the ultrasound are presented. This system meets the target specification of design, and experiments show the accuracy of positioning meets the requirement of application.
出处
《计算机测量与控制》
CSCD
2005年第9期926-928,共3页
Computer Measurement &Control
基金
"十五"863重大基金资助项目(2003AA12331004)
三星电子中国通信研究院资助项目
关键词
定位网络
超声波定位
普适计算
无线电收发模块
sensor networks
ultrasound positioning technology
ubiquitous computing
radio transceiver chip
