基于SimpliciTI协议的无线传感器网络设计

摘要

For problems of large cost and high requirements for hardware of international standards such as GPRS, ZigBee, WiFi, etc. , the paper proposed a design scheme of wireless sensor network based on SimpliciTI protocol which has low power consumption and is suitable for small scale RF network. Firstly, it introduced basic principle of SimpliciTI protocol. Nextly it gave a circuit design scheme of wireless sensor node by use of CC2500 RF transceiver and MSP430 microcomputer with super-low power consumption, and introduced networking and communication processes of wireless sensor network based on SimpliciTI. Finally, it introduced location algorithm of wireless sensor network based on distance. For big error of normal multilateral location algorithm, it proposed an improved location algorithm, namely calculating revised value of error of node ordinate through minimizing the square value of difference between actual distance and evaluated distance, and revising initial ordinate of unknown node by use of 2D hyperbola algorithm, so as to improve locating precision.%针对GPRS、ZigBee、WiFi等国际标准无线传感器网络通信协议价格高、对硬件要求高等问题,提出采用适用于小型射频网络的低功耗SimpliciTI协议设计无线传感器网络的方案.首先介绍了SimpliciTI协议的基本原理；然后给出了一种采用CC2500射频收发芯片和MSP430超低功耗微处理器芯片的无线传感器节点的电路设计方案,并介绍了基于SimpliciTI协议的无线传感器网络的组网及通信过程；最后介绍了基于距离的无线传感器网络定位算法,并针对常用的多边定位算法误差较大的问题,提出了一种改进的定位算法,即通过实际距离和估算距离的误差平方最小化来计算节点坐标的误差修正值,并采用二维双曲线算法修正未知节点的初始定位坐标,从而提高定位精度.