环回授时系统中光纤链路实时温度测量反推单向时延的方法  

Method for Real-Time Temperature Measurement of Optical Fiber Link in Loopback Time Service System to Deduce One-Way Delay

作　　者：陈丁[1,2] 许江宁 江山[3] 吴苗[2] Chen Ding;Xu Jiangning;Jiang Shan;Wu Miao(School of Electronic Engineering,Jiujiang University,Jiujiang,Jiangxi 332005,China;College of Electrical Engineering,Naval University of Engineering,Wuhan,Hubei 430033,China;Admin office,Naval University of Engineering,Wuhan,Hubei 430033,China)

机构地区：[1]九江学院电子工程学院,江西九江332005 [2]海军工程大学电气工程学院,湖北武汉430033 [3]海军工程大学办公室,湖北武汉430033

出　　处：《激光与光电子学进展》2021年第23期92-99,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(41804076);国家重点研发计划(2016YFB0501700,2016YFB0501701)。

摘　　要：光纤链路温度是影响光纤时间同步精度的重要因素,但光纤纤芯的实时温度存在测量难度大,估算误差大等问题。提出了一种测量光纤链路实时温度的新方法。通过对光纤链路往返时延和的精确测量,并通过卡尔曼滤波消除时延抖动和系统噪声,精准地推算出光纤链路纤芯的实时等效平均温度。基于分段温度模型的仿真结果验证了所提等效平均温度用于时间同步系统的可行性。温控箱实验结果表明,所提方法的温度测量精度约为0.015℃。采用所提方法实时跟踪纤芯温度可使环回法时间同步系统授时精度提高约1 ns。The temperature of optical fiber link is an important factor affecting the accuracy of optical fiber time synchronization,but the real-time temperature of fiber core has some problems,such as difficult measurement,large estimation error,and so on.A new method of real-time temperature measurement for optical fiber link is proposed.Through the accurate measurement of the round-trip delay sum of the optical fiber link,and filtering the delay jitter and system noise by Kalman filtering,the real-time equivalent average temperature of the fiber core of the optical fiber link can be accurately calculated.The simulation results based on the segmented temperature model verify the feasibility of proposed equivalent average temperature for the time synchronization system.The temperature control box experimental results show that the accuracy of the proposed method is about 0.015 ℃.Using the proposed method to track the core temperature in real time can improve the timing accuracy of the loopback time synchronization system by about 1 ns.

关 键 词：光纤光学 纤芯温度 等效平均温度 环回法 时间同步 卡尔曼滤波 

分 类 号：TN929.11[电子电信—通信与信息系统]