一种无线传感器网络分布式连续数据采集系统的同步方法

Synchronous method of wireless sensor network for distributed continuous data acquisition system

提出多信道多基站架构构建无线传感器网络连续实时数据采集系统.采用异步时钟对命令进行等间隔多次发送以保证命令的可靠传输;通过TDMA和CSMA/CA机制保障数据的实时可靠收集;基于异步时钟采集、多退少补机制以及节点功能单一化技术对采样点的时间间隔抖动进行优化;提出一种灵活轻量型的晶振漂移补偿机制消除分布式采集系统中独立晶振的累积漂移.经实验验证,本架构可以实现所有采集节点长期和连续地进行同时刻数据采集,并且实时地将采集数据传输给监控中心.

The multiple channels and multiple stations architecture for wireless sensor network continuous real-time data acquisition system was presented.To ensure reliable transfer of commands,asynchronous clock was adopted to issue order respectively with equal interval.Based on time division multiple access and carrier sense multiple access with collision avoidance mechanism,reliable and real-time data was collected.Based on asynchronous clock collection,plus-minus average mechanism,as well as single function of the node,the jitter of sampling intervals was optimized.A flexible and lightweight crystal oscillator drift compensation method was proposed to eliminate the independent crystal oscillator accumulated drift of the distributed acquisition system.Experiments were conducted to verify the above mechanism.This architecture can achieve all the nodes that are synchronously to sample data,and real-time to transfer data to the monitoring center.