级联传感器网络的混合时钟同步方案  

Cascading sensor network hybrid clock synchronization scheme

作　　者：周猛 武杰[1,2] Zhou Meng;Wu Jie(Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;State Key Laboratory of Particle Detection &Electronics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学近代物理系,合肥230026 [2]中国科学技术大学核探测技术与核电子学国家重点实验室,合肥230026

出　　处：《电子测量技术》2018年第21期115-118,共4页Electronic Measurement Technology

基　　金：国家自然科学基金(41574106);国家科技重大专项(2017ZX05008-008-041);国家重大科研装备研制项目(ZDYZ2012-1-05-03)资助

摘　　要：为了解决级联传感器网络的时钟同步问题,提出了一种基于GPS芯片授时和同步帧协议的混合时钟同步方案。该方案希望减少为每个传感器配备GPS芯片用于时钟频率同步造成的功耗浪费,同时通过同步帧协议尽可能达到类似与为每个传感器都配备GPS的同步效果。传感器的上层管理单元简称传感器管理单元,将本地时钟频率与GPS同步,然后通过广播同步帧的方式同步传感器链的时钟。在方案验证模块中,构建了20个级联传感器链路,以测试20个级联传感器同步后的中心频率和时钟稳定性。测试结果显示20个级联传感器的中心频率偏差约为0.037 Hz,稳定度为0.045×10^-6~0.066×10^-6。GPS模块的稳定度为0.06×10^-6,这种方案达到了类似每个传感器都配备GPS芯片用于时钟频率同步的效果。In order to solve the problem of clock synchronization in cascaded sensor networks,a hybrid clock synchronization scheme based on GPS chip timing and synchronization frame protocol was proposed.The scheme hopes to reduce the power consumption caused by clock frequency synchronization for each sensor equipped with a GPS chip, and simultaneously achieve as much as possible synchronization effect with GPS for each sensor through a synchronous frame protocol.The sensor's upper-level unit is called sensor management unit which synchronizes the local clock with the GPS and then use the broadcast sync frame to synchronize the clock of the sensor chain.In the solution verification module,we built 20cascade sensor links to test the center frequency and clock stability of 20cascaded sensors.The test results show that the center frequency deviation of 20 cascaded sensors is about 0.037Hz and the stability is 0.045×10^-6 to 0.066×10^-6.The stability of the GPS module is 0.06×10^-6.This scheme achieves the effect that a similar GPS chip is used for clock frequency synchronization in each sensor.

关 键 词：级联传感器网络 GPS时钟同步 混合时钟同步方案 同步帧 

分 类 号：TN919[电子电信—通信与信息系统]