發(fā)布時(shí)間：2018-03-20 04:08

  本文選題：系統(tǒng)時(shí)間　切入點(diǎn)：廣播　出處：《中國科學(xué)院研究生院（國家授時(shí)中心）》2013年博士論文　論文類型：學(xué)位論文

【摘要】：目前的衛(wèi)星導(dǎo)航系統(tǒng)都是以時(shí)間測量為基礎(chǔ)的，時(shí)間測量的精度直接影響到衛(wèi)星導(dǎo)航系統(tǒng)的定位、測速功能，精確的時(shí)間測量首先需要建立一個(gè)統(tǒng)一的時(shí)間參考——系統(tǒng)時(shí)間，然后通過時(shí)間同步技術(shù)，將系統(tǒng)內(nèi)各原子鐘的時(shí)間同步到系統(tǒng)時(shí)間，并最終通過衛(wèi)星將系統(tǒng)時(shí)間廣播給用戶。此外，授時(shí)是衛(wèi)星導(dǎo)航系統(tǒng)的重要功能，所以需要衛(wèi)星導(dǎo)航系統(tǒng)的系統(tǒng)時(shí)間能夠溯源到國際標(biāo)準(zhǔn)時(shí)間——協(xié)調(diào)世界時(shí)（UTC）。 系統(tǒng)時(shí)間是衛(wèi)星導(dǎo)航系統(tǒng)的核心要素，系統(tǒng)時(shí)間及其廣播和溯源的性能水平直接影響到衛(wèi)星導(dǎo)航系統(tǒng)的性能和用戶的定位、測速及獲得授時(shí)服務(wù)的精度，因此對系統(tǒng)時(shí)間的測試評估具有十分重要的意義。在國外衛(wèi)星導(dǎo)航系統(tǒng)的研制與建設(shè)過程中，對系統(tǒng)時(shí)間的監(jiān)測與評估工作一直受到廣泛重視并長期開展，而我國北斗系統(tǒng)的建設(shè)起步較晚，還沒有系統(tǒng)性的測試評估方法、技術(shù)和平臺。本論文的研究就是為了填補(bǔ)這方面的空白，研究系統(tǒng)時(shí)間測試評估的理論、方法和技術(shù)，建立測試評估系統(tǒng)，研制相關(guān)軟件，為北斗衛(wèi)星導(dǎo)航系統(tǒng)的研制與建設(shè)提供有益幫助。論文的主要研究內(nèi)容如下： 1、研究了北斗系統(tǒng)時(shí)間的測試評估方法，搭建了測試評估系統(tǒng)，分析了在現(xiàn)有條件下，三種時(shí)間比對鏈路的測試精度和不同特點(diǎn)；研究了在不同的性能評估要求下，時(shí)間比對鏈路、采樣時(shí)間的選擇方法，對北斗系統(tǒng)時(shí)間的性能進(jìn)行了測試評估。結(jié)果表明，北斗系統(tǒng)時(shí)間的頻率準(zhǔn)確度優(yōu)于2E-13，7天的頻率穩(wěn)定度略高于1E-14，基本達(dá)到了設(shè)計(jì)的指標(biāo)要求。 2、針對北斗系統(tǒng)的特點(diǎn)，，提出了采用兩套移動校準(zhǔn)站對雙向時(shí)間比對系統(tǒng)設(shè)備時(shí)延進(jìn)行校準(zhǔn)的方法，并深入研究了衛(wèi)星雙向時(shí)間比對設(shè)備時(shí)延變化的特點(diǎn)和小量級誤差的特點(diǎn)及其修正方法。 3、從用戶角度出發(fā)，提出了系統(tǒng)時(shí)間廣播性能的測試評估方法，設(shè)計(jì)了北斗系統(tǒng)時(shí)間廣播性能的測試評估系統(tǒng)，試驗(yàn)結(jié)果表明北斗單星廣播系統(tǒng)時(shí)間的穩(wěn)定度優(yōu)于5ns，準(zhǔn)確度還有待提高，可以考慮對系統(tǒng)差做進(jìn)一步校準(zhǔn)。 4、從系統(tǒng)層面出發(fā)，對GNSS溯源性能的測試評估方法進(jìn)行了研究，并以北斗和GPS為例，搭建了測試評估系統(tǒng)進(jìn)行試驗(yàn)，試驗(yàn)結(jié)果表明相比GPST15ns以內(nèi)的溯源偏差變化，BDT的溯源偏差在30ns以內(nèi)波動。GPST向UTC的溯源性能高于BDT，其溯源的誤差優(yōu)于1.5ns，而BDT向UTC溯源的誤差達(dá)到了20ns。
[Abstract]:At present, the satellite navigation system is based on time measurement. The accuracy of time measurement directly affects the positioning of satellite navigation system, the function of velocity measurement, and the accurate time measurement. First of all, a unified time reference-system time is needed. Then through the time synchronization technology, the time of each atomic clock in the system is synchronized to the system time, and finally the system time is broadcast to the user through the satellite. In addition, the timing service is an important function of the satellite navigation system. Therefore, the system time needed for satellite navigation system can be traced to international standard time-UTC. System time is the core element of satellite navigation system. System time and its broadcast and traceability level directly affect the performance of satellite navigation system and the positioning of users, speed measurement and accuracy of time service. Therefore, it is of great significance to test and evaluate the system time. In the process of development and construction of satellite navigation system abroad, the monitoring and evaluation of system time has been widely paid attention to and carried out for a long time. However, the construction of Beidou system in our country started relatively late, and there is no systematic test and evaluation method, technology and platform. The purpose of this paper is to fill in the blank in this respect, to study the theory, method and technology of system time test and evaluation. The establishment of test and evaluation system, the development of related software, for the development and construction of the Beidou satellite navigation system to provide useful help. The main contents of this paper are as follows:. 1. The test and evaluation method of Beidou system time is studied, the test evaluation system is built, the test accuracy and different characteristics of the three time comparison links are analyzed under the existing conditions, and the different performance evaluation requirements are studied. The performance of Beidou system is tested and evaluated by the time comparison link and sampling time selection method. The results show that, The frequency accuracy of Beidou system is better than that of 2E-13 / 7 days. The frequency stability of Beidou system is slightly higher than 1E-14, which basically meets the requirements of the design. 2. According to the characteristics of Beidou system, two sets of mobile calibration stations are proposed to calibrate the time delay of the system equipment. The characteristics of the time-delay variation of the equipment and the characteristics of the small-order error and the correction method are also studied in detail. 3. From the point of view of users, the test and evaluation method of system time broadcast performance is put forward, and the test and evaluation system of Beidou system time broadcast performance is designed. The experimental results show that the time stability of Beidou single satellite broadcasting system is better than that of 5 ns, and the accuracy still needs to be improved. Further calibration of the system difference can be considered. 4. From the system level, the testing and evaluation method of GNSS traceability is studied. Taking Beidou and GPS as examples, the test and evaluation system is built and tested. The experimental results show that the traceability of UTC is better than that of UTC, and the error of tracing to UTC is better than 1.5 ns, while the error of BDT to UTC is 20ns. the results show that the traceability of UTC is higher than that of BDTs in the range of 30ns, and the traceability of BDT to UTC is better than that of BDTs.
【學(xué)位授予單位】：中國科學(xué)院研究生院（國家授時(shí)中心）
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：P228.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉曉剛;吳曉平;劉雁雨;曹紀(jì)東;;基于GEO和IGSO衛(wèi)星的Sagnac效應(yīng)的求解[J];測繪科學(xué);2009年02期

2 楊效果;趙靜;黨亞民;袁玉斌;;相對論效應(yīng)計(jì)算方法的精度研究[J];測繪科學(xué);2012年03期

3 王新龍;李亞峰;;GPS定位中4種對流層延遲修正模型適應(yīng)性分析[J];電光與控制;2008年11期

4 鄭子揚(yáng);Patrizia Tavella;王慶;;伽利略EPTS中原子鐘頻率穩(wěn)定度與噪聲類型分析[J];電子測量與儀器學(xué)報(bào);2007年05期

5 陳劉成;唐波;;參考系選擇對Kepler廣播星歷參數(shù)擬合精度的影響[J];飛行器測控學(xué)報(bào);2006年04期

6 柯熙政,李孝輝,劉志英,鄧方林;關(guān)于小波分解原子時(shí)算法的頻率穩(wěn)定度[J];計(jì)量學(xué)報(bào);2002年03期

7 張?jiān)?高小s

本文編號：1637424