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Sensors 2015, 15(8), 17895-17915; doi:10.3390/s150817895

An Autonomous Satellite Time Synchronization System Using Remotely Disciplined VC-OCXOs

1
School of Electronic and Information Engineering, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing 100191, China
2
Australian Centre for Space Engineering Research (ACSER), School of Electrical Engineering and Telecommunications, University of New South Wales, High Street, Sydney, NSW 2052, Australia
3
Space Star Technology Co., Ltd., Zhichun Road No. 82, Haidian District, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 3 June 2015 / Revised: 17 July 2015 / Accepted: 20 July 2015 / Published: 23 July 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2119 KB, uploaded 23 July 2015]   |  

Abstract

An autonomous remote clock control system is proposed to provide time synchronization and frequency syntonization for satellite to satellite or ground to satellite time transfer, with the system comprising on-board voltage controlled oven controlled crystal oscillators (VC-OCXOs) that are disciplined to a remote master atomic clock or oscillator. The synchronization loop aims to provide autonomous operation over extended periods, be widely applicable to a variety of scenarios and robust. A new architecture comprising the use of frequency division duplex (FDD), synchronous time division (STDD) duplex and code division multiple access (CDMA) with a centralized topology is employed. This new design utilizes dual one-way ranging methods to precisely measure the clock error, adopts least square (LS) methods to predict the clock error and employs a third-order phase lock loop (PLL) to generate the voltage control signal. A general functional model for this system is proposed and the error sources and delays that affect the time synchronization are discussed. Related algorithms for estimating and correcting these errors are also proposed. The performance of the proposed system is simulated and guidance for selecting the clock is provided. View Full-Text
Keywords: time synchronization; dual one-way ranging; inter-satellite link; clock adjustment time synchronization; dual one-way ranging; inter-satellite link; clock adjustment
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gu, X.; Chang, Q.; Glennon, E.P.; Xu, B.; Dempster, A.G.; Wang, D.; Wu, J. An Autonomous Satellite Time Synchronization System Using Remotely Disciplined VC-OCXOs. Sensors 2015, 15, 17895-17915.

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