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提高网络授时精度的Kalman滤波方法 被引量:9

Network time transfer accuracy improvement with Kalman filter method
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摘要 在通信网络中传输标准时间往往受到时延很大的影响,造成精度不高。为了提高网络授时精度,提出一种基于卡尔曼滤波器的修正方法,将网络时延分解为固有延时、抖动时延、突发时延3个部分,利用Kalm an滤波器减小抖动时延,利用跟踪门消除突发时延,从而使网络时延更加逼近固有时延,有利于提高授时精度。在MATLAB中运用S imEvents扩展模块,搭建一个端到端的计算机网络传输模型,验证了卡尔曼滤波对网络时延精度提高的效果,算法在稳定后,时延的估计值与测量值相比,精度可以提高大约100倍。在此基础上,利用LabVIEW设计了一个实时测试平台,嵌入MATLAB程序,实时获取通信网络时延并进行滤波处理。通过实际有线和无线网络测量的时延数据的验证,表明所提出的滤波修正方法的效果明显。 In communication networks,the transmission of coordinated universal time(UTC) is always influenced by delay,hence the accuracy is reduced.In this paper,a correction method based on Kalman filter has been proposed.The delay of networks is divided into three parts,which include fixed delay,jitter delay and burst delay.Kalman filter is employed to reduce the jitter delay,while a tracking door is used for burst delay reduction.Therefore,the delay of networks will approach to the fixed delay and the accuracy is improved.In order to verify the accuracy improvement effect of Kalman filter,the SimEvents expansion module in MATLAB is used to build a terminal-to-terminal computer network transmission model.When the algorithm works steadily,the accuracy of the estimated time delay can be improved by 100 times compared with the measured time delay.A real-time test platform was designed in LabVIEW,which embeds the MATLAB program.Real-time communication network delay was obtained and then filtered.Results indicate that the proposed correction method is effective through the verification of the actual data in both wireless and cable networks.
出处 《仪器仪表学报》 EI CAS CSCD 北大核心 2011年第4期949-954,共6页 Chinese Journal of Scientific Instrument
关键词 KALMAN滤波 标准时间 网络时延 Kalman filter UTC network delay
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