一种新的倒GPS基站间的时钟同步方法

Journal of Systems Engineering and Electronics ›› 2009, Vol. 31 ›› Issue (7): 1710-1714.

一种新的倒GPS基站间的时钟同步方法

于淼^1,2, 陈杰^1,2, 窦丽华^1,2, 甘明刚^1,2

1. 北京理工大学自动化学院, 北京, 100081;
2. 北京理工大学复杂系统智能控制与决策教育部重点实验室, 北京, 100081

收稿日期:2008-05-06 修回日期:2009-02-20 出版日期:2009-07-20 发布日期:2010-01-03
作者简介:于淼(1982- ),男,博士研究生,主要研究方向为分布式复杂网络系统的时钟同步.E-mail:olivermiaoer@163.com
基金资助:
北京市教育委员会共建基金资助课题(100070522)

New method of clock synchronization among inverse GPS base-stations

YU Miao^1,2, CHEN Jie^1,2, DOU Li-hua^1,2, GAN Ming-gang^1,2

1. School of Automation, Beijing Inst. of Technology, Beijing 100081, China;
2. Key Lab. of Complex System Intelligent Control and Decision of the Ministry of Education, Beijing Inst. of Technology, Beijing 100081, China

Received:2008-05-06 Revised:2009-02-20 Online:2009-07-20 Published:2010-01-03

摘要/Abstract

摘要： 时钟同步技术是基于倒GPS(IGPS)基站网络来进行目标定位的重要研究内容。提出了一种与IGPS基站时钟结合的自适应离散卡尔曼滤波方法,该方法利用测量新息和状态修正序列在估计窗内分段静止的特性,克服了传统卡尔曼滤波过程过分依赖于数学模型和统计模型正确性的问题。通过这种方法可以在线实时修正和转换IGPS基站间的时钟相位偏差和时钟偏移,找出最佳时钟适应曲线,并估计过程噪声和测量噪声的协方差矩阵。仿真结果表明,该方法能够提高IGPS基站间的时钟同步精度,使同步精度达到微秒量级。

Abstract: Clock synchronization technology is an important research content based on IGPS base-station networks of target positioning.An adaptive discrete-time Kalman filtering method combined with IGPS base-station clocks is proposed.The algorithm is carried out by using the property that the measurement innovation sequence is piecewise stationary inside an estimation window.The algorithm also overcomes the traditional Kalman filtering process which excessively relies on the correctness of the mathematical and stastical models.Using this algorithm,the relative phase offsets and clock skews among the clocks of IGPS base-stations can be corrected and converted.Also,the best fit line over the observations on line can be found,and the covariance matrices of the process and measurement noises are estimated.Simulation results show that the proposed algorithm can improve the accuracy of clock synchronization among IGPS base-stations and the synchronization accuracy can reach the microsecond order of magnitude.

中图分类号:

TP273.2

于淼, 陈杰, 窦丽华, 甘明刚. 一种新的倒GPS基站间的时钟同步方法[J]. Journal of Systems Engineering and Electronics, 2009, 31(7): 1710-1714.

YU Miao, CHEN Jie, DOU Li-hua, GAN Ming-gang. New method of clock synchronization among inverse GPS base-stations[J]. Journal of Systems Engineering and Electronics, 2009, 31(7): 1710-1714.