时间频率远程校准系统测量终端设计与实现

发布时间：2018-02-28 08:37

本文关键词： 时间频率远程校准共视 GPS 测量不确定度　出处：《中国科学院研究生院（国家授时中心）》2013年硕士论文　论文类型：学位论文

【摘要】：中国科学院国家授时中心保持协调世界时UTC（NTSC），与UTC的偏差保持在±30ns内。同时，国家授时中心也致力于各种高精度时间传递技术的研究，尽可能的将所保持的高精度时间应用到国民生产、经济建设和相关的科研领域中。GPS多通道共视时间传递方法可以在很大程度上消除观测中两站间单颗卫星的星历误差，并完全消除星钟误差，实现的时间传递精度优于5ns，但是传统共视观测方法每个周期内存在3分钟的不观测时间，无法实现本地参考时间与GPST时差的连续比对。基于国家授时中心保持的UTC（NTSC）和GPS共视时间传递方法，提出了时间频率连续比对的方法并研制了时间频率远程校准系统，用于完成时间频率的远程校准及向UTC（NTSC）高精度溯源。论文讨论的主要内容包括以下几个方面： 1、基于UTC（NTSC）的时间频率远程校准及溯源方法根据时间频率连续比对方法，，系统测量终端可实现对远程用户本地参考时间和GPS系统时间（GPST）时差的连续监测，去除了传统GPS共视时间传递方法中每个观测周期内的不观测时间。通过系统可实现远程用户时间频率的校准和溯源。在数据传输方面，远程数据传输网络实现了近实时的共视比对。此外，论文还分析了远程用户通过时间频率远程校准系统向UTC（NTSC）溯源的过程。 2、系统测量终端的设计与实现根据时间频率连续比对方法，设计和实现了时间频率远程校准系统的测量终端，可用于完成本地参考时间与GPST时差的连续监测以及与系统分析中心的数据通信功能。测量终端的硬件设备实现了一体化的集成；开发完成的测量终端软件可完成预期的各种功能，具有较好的稳定性和可靠性。 3、系统测量不确定度评估根据系统零基线比对与长基线比对的实验结果，对系统的时间测量不确定度和频率测量不确定度进行了评估。系统时间测量的A类不确定度优于2ns，B类不确定度优于6.5ns，扩展不确定度优于13ns（2σ）；频率测量的扩展不确定度优于1×10-13（）。
[Abstract]:The National time Service Center of the Chinese Academy of Sciences maintains a coordinated UTC NTSC, and the deviation with UTC is kept within 卤30ns. At the same time, the National time Service Center is also dedicated to the research of various high-precision time transfer techniques. As far as possible, applying the high precision time to national production, economic construction and related scientific research, the GPS multi-channel common viewing time transfer method can largely eliminate the ephemeris error of a single satellite between two stations in the observation. The accuracy of time transfer is better than that of 5 ns, but the traditional common view observation method does not have 3 minutes of observation time in each cycle, so it is impossible to compare the local reference time and GPST time difference continuously. Based on the method of time transfer between UTC and GPS, a method of continuous comparison of time and frequency is put forward and a remote calibration system of time and frequency is developed. For remote calibration of time and frequency and high precision traceability to UTC NTSC. the main contents of this paper include the following aspects:. 1. Remote calibration and traceability of time and frequency based on UTC NTSC. According to the method of continuous comparison of time and frequency, the system can realize the continuous monitoring of the local reference time of remote users and the time difference of GPS system. The system can realize the calibration and traceability of the time frequency of remote users. In the aspect of data transmission, it is possible to realize the calibration and traceability of the time and frequency of remote users by removing the non-observed time in each observation cycle of the traditional GPS common view time transfer method. In addition, the paper also analyzes the process of remote users tracing to UTC / NTSCs through the time and frequency remote calibration system. 2. Design and implementation of system measurement terminal. According to the time-frequency continuous comparison method, the measurement terminal of the time-frequency remote calibration system is designed and implemented. It can be used to realize the continuous monitoring of local reference time and GPST time difference and the data communication function with the system analysis center. The developed terminal software can accomplish the expected functions and has good stability and reliability. 3. System measurement uncertainty evaluation. According to the experimental results of system zero baseline alignment and long baseline comparison, The uncertainty of time measurement and frequency measurement is evaluated. The class A uncertainty of system time measurement is better than that of 2nslb type uncertainty, the extended uncertainty is better than 6.5ns, the extended uncertainty is better than 13ns2 蟽, and the extended uncertainty of frequency measurement is better than 1 脳 10-13.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P127.1

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