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Satellite bidirectional time frequency delivery method based on dual-carrier phase real-time compensation

A two-way time and frequency transmission technology, applied in transmission monitoring, transmission systems, radio transmission systems, etc., can solve the problems of limited accuracy of pseudo-random code bandwidth and length, transmission error, and transmission accuracy that cannot meet the transmission requirements of the clock-keeping group. , to achieve the effect of realizing time transfer and improving the accuracy of time transfer

Active Publication Date: 2017-11-07
TSINGHUA UNIV
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Problems solved by technology

[0003] At present, the two-way time-frequency transmission of satellites is mainly based on the pseudo-range measurement of the pseudo-code, and the accuracy is limited by the bandwidth and length of the pseudo-random code.
In addition, due to the transmission error introduced by the delay fluctuation of the transmission path, the transmission accuracy can no longer meet the transmission requirements of the clock watch group, thus forming a bottleneck for realizing higher-precision TAI and UTC. It is urgent to develop real-time measurement and A Novel Satellite Time Transfer Method with Active Compensation

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[0026] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0027] The embodiment of the present disclosure provides a satellite two-way time-frequency transfer method based on dual-carrier phase real-time compensation, which is used for such as figure 1 The satellite and the ground station are shown, wherein the ground stations a and b both include: antenna, local clock (a ground clock / b ground clock), compensation unit, transmission delay calculation unit and clock difference calculation unit, etc.

[0028] Satellite two-way time-frequency transfer methods include:

[0029] Step S1: Construct a satellite two-way time transfer link, including a satellite and two ground stations a and b for satellite two-way time transfer. Among them, the clock error of ground station a relat...

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Abstract

The invention provides a satellite bidirectional time frequency delivery method based on dual-carrier phase real-time compensation. A ground station acquires a transmission path delay according to transmission phase delays of two downlink signals, reciprocating transmission on a satellite-ground link is achieved via a carrier signal to measure the transmission path delay in real time and dynamically compensate the same, and meanwhile time injection from the ground station to a satellite is achieved; a carrier phase measurement method which is more accurate than a pseudo code measurement method is selected for measuring the transmission path delay in real time, and time delivery accuracy is further improved; the reproduced remote clock signal is transmitted to the ground station via a satellite for comparing time, and thus time delivery between the ground stations at difference places is achieved.

Description

technical field [0001] The present disclosure relates to the field of time transfer, in particular, to a satellite two-way time-frequency transfer method based on dual-carrier phase real-time compensation. Background technique [0002] For free-space time transfer, the currently commonly used methods mainly include the clock-carrying method, the satellite common-view method, the satellite full-view method, and the satellite two-way time-frequency transfer method. Among them, the satellite two-way time-frequency transfer method is currently one of the most accurate long-distance time comparison technologies in the world, its time comparison accuracy is better than 1ns, and the frequency transmission stability is better than 10 -14 / sky. Since 1999, recommended by the International Telecommunication Union (ITU), the satellite two-way time-frequency transfer method has been officially used in the calculation of Universal Atomic Time (TAI) and Universal Coordinated Time (UTC). ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04B7/185H04B17/364G04R20/04
CPCG04R20/04H04B7/18519H04B17/364H04J3/0682
Inventor 王力军董婧雯白钰王波王时光
Owner TSINGHUA UNIV
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