本文關鍵詞： 時間頻率 遠程校準 共視 GPS 測量不確定度　出處：《中國科學院研究生院（國家授時中心）》2013年碩士論文　論文類型：學位論文

【摘要】：中國科學院國家授時中心保持協(xié)調(diào)世界時UTC（NTSC），與UTC的偏差保持在±30ns內(nèi)。同時，國家授時中心也致力于各種高精度時間傳遞技術的研究，盡可能的將所保持的高精度時間應用到國民生產(chǎn)、經(jīng)濟建設和相關的科研領域中。GPS多通道共視時間傳遞方法可以在很大程度上消除觀測中兩站間單顆衛(wèi)星的星歷誤差，并完全消除星鐘誤差，實現(xiàn)的時間傳遞精度優(yōu)于5ns，但是傳統(tǒng)共視觀測方法每個周期內(nèi)存在3分鐘的不觀測時間，無法實現(xiàn)本地參考時間與GPST時差的連續(xù)比對。 基于國家授時中心保持的UTC（NTSC）和GPS共視時間傳遞方法，提出了時間頻率連續(xù)比對的方法并研制了時間頻率遠程校準系統(tǒng)，用于完成時間頻率的遠程校準及向UTC（NTSC）高精度溯源。論文討論的主要內(nèi)容包括以下幾個方面： 1、基于UTC（NTSC）的時間頻率遠程校準及溯源方法 根據(jù)時間頻率連續(xù)比對方法，，系統(tǒng)測量終端可實現(xiàn)對遠程用戶本地參考時間和GPS系統(tǒng)時間（GPST）時差的連續(xù)監(jiān)測，去除了傳統(tǒng)GPS共視時間傳遞方法中每個觀測周期內(nèi)的不觀測時間。通過系統(tǒng)可實現(xiàn)遠程用戶時間頻率的校準和溯源。在數(shù)據(jù)傳輸方面，遠程數(shù)據(jù)傳輸網(wǎng)絡實現(xiàn)了近實時的共視比對。此外，論文還分析了遠程用戶通過時間頻率遠程校準系統(tǒng)向UTC（NTSC）溯源的過程。 2、系統(tǒng)測量終端的設計與實現(xiàn) 根據(jù)時間頻率連續(xù)比對方法，設計和實現(xiàn)了時間頻率遠程校準系統(tǒng)的測量終端，可用于完成本地參考時間與GPST時差的連續(xù)監(jiān)測以及與系統(tǒng)分析中心的數(shù)據(jù)通信功能。測量終端的硬件設備實現(xiàn)了一體化的集成；開發(fā)完成的測量終端軟件可完成預期的各種功能，具有較好的穩(wěn)定性和可靠性。 3、系統(tǒng)測量不確定度評估 根據(jù)系統(tǒng)零基線比對與長基線比對的實驗結(jié)果，對系統(tǒng)的時間測量不確定度和頻率測量不確定度進行了評估。系統(tǒng)時間測量的A類不確定度優(yōu)于2ns，B類不確定度優(yōu)于6.5ns，擴展不確定度優(yōu)于13ns（2σ）；頻率測量的擴展不確定度優(yōu)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 鹵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.
【學位授予單位】：中國科學院研究生院（國家授時中心）
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P127.1

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