本文選題：轉(zhuǎn)發(fā)式共視授時　切入點：雙向衛(wèi)星時間比對　出處：《中國科學(xué)院研究生院（國家授時中心）》2013年碩士論文

【摘要】：現(xiàn)有的遠距離高精度時間傳遞技術(shù)主要有GPS共視和衛(wèi)星雙向時間比對（Two-WaySatellite Time and Frequency Transfer, TWSTFT）。GPS偽碼共視的精度較低，TWSTFT的設(shè)備昂貴，其在需要高精度時間標準的工程實踐中的應(yīng)用受到限制。 為解決上述問題本文提出了一種使用GEO通信衛(wèi)星進行轉(zhuǎn)發(fā)式共視授時的方法（Common-View time transfer with Transfer mode, TCV）。該方法獨立于GNSS系統(tǒng)和典型TWSTFT系統(tǒng)，可以實現(xiàn)在單顆GEO衛(wèi)星的覆蓋區(qū)域內(nèi)，將守時實驗室的高精度標準時間傳遞給用戶。守時實驗室需配備接收和發(fā)射設(shè)備，用戶僅需配備接收設(shè)備。守時實驗室將以其主鐘為參考的偽碼測距信號向GEO衛(wèi)星發(fā)射，GEO衛(wèi)星轉(zhuǎn)發(fā)該信號，，守時實驗室和用戶同時接收經(jīng)衛(wèi)星轉(zhuǎn)發(fā)的信號并進行偽距測量，解算用戶與守時實驗室之間的相對鐘差，實現(xiàn)轉(zhuǎn)發(fā)式共視授時。守時實驗室和用戶均使用增益高、信噪比好、有效抗多徑的拋物面天線作為接收天線。 中國科學(xué)院國家授時中心保持有中國的國家標準時間UTC(NTSC)，本文使用C波段雙向衛(wèi)星時間頻率比對系統(tǒng)（Two Way Satellite Time and Frequency Transfer with C band,TW(C)）進行試驗；在位于臨潼的國家授時中心、長春人衛(wèi)站和喀什站各放置兩套TW(C)設(shè)備，分別進行兩次試驗；由國家授時中心發(fā)射偽碼測距信號作為主站，長春和喀什兩站僅使用TW(C)設(shè)備的接收功能模擬用戶接收機。終端設(shè)備型號為德國TimeTech公司的SATRE MODEM，擴頻碼速率為20MChips，試驗衛(wèi)星為中星10號GEO通信衛(wèi)星（星下點位于東經(jīng)110.5度）。 該方法要求事先確定接收機的天線坐標和GEO衛(wèi)星的軌道。軌道數(shù)據(jù)來自中國科學(xué)院國家授時中心轉(zhuǎn)發(fā)式測定軌系統(tǒng)，精度為米級水平，在星地連線上精度達到分米級。試驗中以衛(wèi)星雙向時間比對的結(jié)果作為真值，評判轉(zhuǎn)發(fā)式共視授時的精度。數(shù)據(jù)處理中除修正Sagnac效應(yīng)、電離層時延、對流層時延等常規(guī)影響外，還修正了固體潮影響。固體潮會引起分米級的幾何路徑時延變化，考慮固體潮影響會使兩種方法互差的標準差最多減少0.11納秒。試驗結(jié)果比較表明：轉(zhuǎn)發(fā)式共視授時方法是一種可行的遠距離高精度時間傳遞方法，在所需數(shù)據(jù)完整的前提下，其結(jié)果與TWSTFT結(jié)果的吻合程度要優(yōu)于0.5ns，顯著優(yōu)于GPS遠距離偽碼共視比對精度(3~5ns)。
[Abstract]:The existing long distance and high precision time transfer techniques mainly include GPS common view and two way satellite time comparison. The TWSTFT).GPS pseudo-code common viewing equipment is expensive, and its application in engineering practice which needs high precision time standard is limited.In order to solve the above problems, this paper presents a method of forwarding co-view timing using GEO communication satellite, which is composed of Common-View time transfer with Transfer mod.This method is independent of the GNSS system and the typical TWSTFT system. It can transmit the high precision standard time of the punctuality laboratory to the user in the coverage area of a single GEO satellite.Time-keeping laboratories need to be equipped with receiving and transmitting equipment, and users only need to be equipped with receiving equipment.The punctuality laboratory transmits the pseudo-code ranging signal referred to its main clock to the GEO satellite by transmitting the signal. The punctuality laboratory and the user simultaneously receive the signals transmitted by the satellite and conduct pseudo-range measurements.The relative clock difference between the user and the punctuality laboratory is calculated, and the forwarding common view time is realized.High gain, good signal-to-noise ratio (SNR) and effective multipath resistant paraboloid antenna are used as receiving antennas in punctuality laboratories and users.The National time Service Center of the Chinese Academy of Sciences maintains China's national standard time UTC / NTSCN. In this paper, two Way Satellite Time and Frequency Frequency Transfer with TWWNs are used to carry out experiments at the National time Service Center in Lintong, which is located in Lintong.Changchun and Kashi stations each put two sets of TWN C) equipment to carry out two tests respectively. The National time Service Center transmits pseudo-code ranging signal as the main station, and Changchun and Kashi stations only use the receiving function of TWCU equipment to simulate the user receiver.The terminal equipment model is SATRE MODEM of TimeTech Company of Germany, the spread spectrum code rate is 20m Chips. the test satellite is Zhongxing 10 GEO communication satellite (the lower point is 110.5 degrees east longitude).This method requires the antenna coordinates of the receiver and the orbit of the GEO satellite to be determined in advance.The orbit data are obtained from the National time Service Center of the Chinese Academy of Sciences (CAS). The accuracy of the orbit determination system is meter level, and the accuracy on the satellite to earth line reaches the decimeter level.In the experiment, the result of satellite bidirectional time comparison is taken as the true value to judge the accuracy of forwarding common view time.In data processing, the effects of Sagnac effect, ionospheric delay and tropospheric delay are corrected as well as the effect of solid tide.Considering the influence of solid tide, the standard deviation of the two methods can be reduced by 0.11 nanoseconds.The experimental results show that the forward common view time delivery method is a feasible method for long distance and high precision time transmission.The agreement between the result and the TWSTFT result is better than 0.5 ns, and is significantly better than that of GPS long distance PN code.
【學(xué)位授予單位】：中國科學(xué)院研究生院（國家授時中心）
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P228.4

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相關(guān)期刊論文 前10條

1 劉曉剛;吳曉平;劉雁雨;曹紀東;;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 余明,郭際明,過靜s

本文編號：1727729