结合智能天线的WSN定位系统设计与实现

Design and Realization of WSN Location-Aware System Integrated with Smart Antenna

为提高无线传感器网络(WSN)定位系统的定位精度,本文从软件及硬件两方面入手,根据系统特点研究控制算法、开发控制程序、搭建外围电路,实现了电小可操控寄生阵列辐射器(ESPAR)智能天线与nanoPAN5375 WSN定位系统相结合,使后者可根据通信质量控制前者的波束指向,使其始终指向通信质量较好的方向,从而提高系统信噪比、信干比,最终提高定位精度。之后在办公室环境中进行了定位实验,N次重复实验所得定位结果均值的定位误差为0.36m,标准差为0.15 m。本文对于研究如何提高WSN定位系统的定位精度具有重要意义。

In order to improve locating accuracy of wireless sensor network （WSN） location-aware system, the soft- ware and hardware are studied according to the system characteristic including studying control algorithm, developing control program and setting up peripheral circuit, and then the integration of electronically steerable parasitic array radiator （ES- PAR ） smart antenna and WSN location-aware system is realized. As a result, the system is enabled to control the main beam of ESPAR according to communication quality, and its main beam can always point to the direction with best communication quality, so signal to noise ratio （SNR） and signal to jamming ratio （SJR） are enhanced and finally the locating accuracy is enhanced. After that experiments are repeated N times in office environment. The locating error of the mean value for N times locating results is 0.36m, and the standard deviation is 0.15m. This paper has great significance on studying how to enhance the accuracy of WSN location-aware system.