CN106571874B - Optical fiber one-way time frequency transmission system and method - Google Patents
Optical fiber one-way time frequency transmission system and method Download PDFInfo
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- CN106571874B CN106571874B CN201610974463.7A CN201610974463A CN106571874B CN 106571874 B CN106571874 B CN 106571874B CN 201610974463 A CN201610974463 A CN 201610974463A CN 106571874 B CN106571874 B CN 106571874B
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Abstract
The invention discloses a system and a method for transmitting optical fiber one-way time frequency, wherein the method comprises the following steps: converting an electric signal containing time-frequency information of a transmitting end reference time frequency source into an optical signal; the receiving end receives optical signals through the optical link; converting the optical signal into an electrical signal; recovering the signal by using a phase micro-jump device to generate a time frequency signal, and measuring the time difference between a reference time signal of the transmitting end and the time signal generated by the receiving end to further obtain the time frequency information of a time frequency source of the transmitting end; and according to the time-frequency information of the time frequency source of the transmitting end and the calibrated optical fiber transmission link between the receiving end and the transmitting end, taming the time frequency source of the receiving end so as to synchronize the time frequency source of the receiving end and the time frequency source of the transmitting end. The invention has the following advantages: the calibrated time transmission link is used for taming the time frequency source of the receiving end so that the time frequency source of the receiving end and the time frequency source of the transmitting end are synchronous, and the accuracy and the stability are good.
Description
Technical Field
The invention relates to the technical field of time frequency calibration, in particular to an optical fiber one-way time frequency transmission system and method.
Background
Optical fibers are short for optical fibers, and are fibers made of glass or plastic that can be used as a light conducting means. The transmission principle is that the 'total reflection of light' fine optical fiber is encapsulated in a plastic sheath so that it can be bent without breaking. Generally, a Light Emitting Diode (LED) or a laser beam is used as a transmitter at one end of the optical fiber to transmit an optical pulse to the optical fiber, and a photosensor is used as a receiver at the other end of the optical fiber to detect the pulse.
In daily life, optical fibers are used for long distance information transmission because the loss of light transmitted through optical fibers is much lower than the loss of electricity transmitted through electric wires.
Time service is the basic technical support of the country, and high precision time transfer and synchronization is a major part thereof. Statistical analysis shows that the performance of the atomic clock is improved by one order of magnitude every seven years, along with the rapid development of the atomic clock technology, the time synchronization means is continuously improved due to the rapid development of the communication technology, and the precision is continuously improved.
At present, a plurality of time comparison methods are adopted in the international time transfer link. They differ in alignment accuracy, coverage and operating costs. The GPS time frequency transfer comparison only needs a GPS time frequency transfer receiver and a receiving antenna, does not need other accessory equipment, has relatively low running cost, can fully meet the precision requirements of both the short baseline and the long baseline comparison, and has important application value in the construction of regional or national comprehensive time scale.
The satellite two-way method (TWSTFT) uses communication satellites to perform high precision remote time alignment, and several major countries in asia have adopted this technology. The comparison precision of TWSTFT is one order of magnitude higher than that of GPS code-based time frequency transmission, but the method has to rent a communication satellite as a medium for signal forwarding, the comparison cannot be continuously carried out, and both comparison parties need to be equipped with special transmitting and receiving equipment, so the equipment price is high, and thus, the current laboratories with two-way comparison conditions are not many.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
To this end, a first object of the present invention is to provide an optical fiber one-way time-frequency transmission method, which accurately performs remote transmission of time-frequency data by optical signals instead of electrical signals.
In order to achieve the above object, an embodiment of the present invention discloses an optical fiber one-way time frequency transmission method, including the following steps: s1: converting an electrical signal containing frequency information of a transmitting-end reference time frequency source into an optical signal; s2: the receiving end receives the optical signal through an optical fiber link; s3: converting the optical signal into the electrical signal; s4: the receiving end recovers signals by using a phase micro-jump device according to the electric signals to generate time frequency signals, and the time difference between the reference time signals of the transmitting end and the time signals generated by the receiving end is measured, so that the time frequency information of the time frequency source of the transmitting end is obtained; s5: and according to the time-frequency information of the time frequency source of the transmitting end and the calibrated optical fiber transmission link between the receiving end and the transmitting end, disciplining the time frequency source of the receiving end so as to synchronize the time frequency source of the receiving end and the time frequency source of the transmitting end.
According to the optical fiber unidirectional time frequency transmission method provided by the embodiment of the invention, the calibrated time transmission link is utilized, and the time frequency source of the receiving end is acclimated according to the time frequency information of the time frequency source of the transmitting end, which is acquired and read out by the optical fiber link, so that the time frequency source of the receiving end and the time frequency source of the transmitting end are synchronous, and the accuracy and the stability are better.
In addition, the optical fiber unidirectional time frequency transmission method according to the above embodiment of the present invention may further have the following additional technical features:
further, in step S3, the time-frequency information of the time-frequency source of the transmitting end is obtained by using the frequency distribution amplifier according to the electrical signal.
Further, the calibrated optical fiber transmission link between the receiving end and the transmitting end comprises: the first GNSS time-frequency transfer receiver is connected with the time frequency source of the transmitting terminal; the second GNSS time-frequency transfer receiver is connected with the time frequency source of the receiving end; wherein the first GNSS time-frequency transfer receiver and the second GNSS time-frequency transfer receiver are synchronized.
Further, the calibrated optical fiber transmission link between the receiving end and the transmitting end comprises: the first optical fiber time frequency comparison equipment is connected with a time frequency source of the transmitting end; the second optical fiber time frequency comparison equipment is connected with a time frequency source of the receiving end; the first optical fiber time frequency comparison equipment and the second optical fiber time frequency comparison equipment are synchronous.
The second objective of the present invention is to provide a time-frequency comparison system, which uses optical signals to replace electrical signals to accurately transmit time-frequency data remotely.
In order to achieve the above object, an embodiment of the present invention discloses an optical fiber one-way time frequency transmission system, including: the transmitting terminal is used for converting an electric signal of frequency information of a transmitting terminal reference time frequency source into an optical signal; the transmitting end and the receiving end are connected through the first optical fiber transmission link; the receiving end, wherein the receiving end includes: an optical signal receiving module, configured to receive the optical signal through the first optical fiber link; the photoelectric conversion module is used for converting the optical signal into an electric signal; the phase micro-jump device is used for recovering signals according to the electric signals and generating time frequency signals; the time-frequency information generating module is used for measuring the time difference between a reference time signal of a transmitting end and a time signal generated by the receiving end so as to obtain the time-frequency information of a time-frequency source of the transmitting end; and the disciplining module is used for disciplining the time frequency source of the receiving end according to the time frequency information of the time frequency source of the transmitting end and the calibrated second optical fiber transmission link between the receiving end and the transmitting end so as to synchronize the time frequency source of the receiving end and the time frequency source of the transmitting end.
According to the optical fiber unidirectional time frequency transmission system provided by the embodiment of the invention, the calibrated time transmission link is utilized, and the time frequency source of the receiving end is acclimated according to the time frequency information of the time frequency source of the transmitting end, which is acquired and read by the optical fiber link, so that the time frequency source of the receiving end and the time frequency source of the transmitting end are synchronous, and the accuracy and the stability are better.
In addition, the optical fiber unidirectional time frequency transmission system according to the above embodiment of the present invention may further have the following additional technical features:
further, the time frequency information generating module is a frequency distribution amplifier.
Further, the second optical fiber transmission link includes: the first GNSS time-frequency transfer receiver is connected with the time frequency source of the transmitting terminal; the second GNSS time-frequency transfer receiver is connected with the time frequency source of the receiving end; wherein the first GNSS time-frequency transfer receiver and the second GNSS time-frequency transfer receiver are synchronized.
Further, the second optical fiber transmission link includes: the first optical fiber time frequency comparison equipment is connected with a time frequency source of the transmitting end; the second optical fiber time frequency comparison equipment is connected with a time frequency source of the receiving end; the first optical fiber time frequency comparison equipment and the second optical fiber time frequency comparison equipment are synchronous.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method for unidirectional time-frequency transmission of optical fibers according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a transmission system in the optical fiber one-way time frequency transmission method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a comparison result between a phase jumper at a transmitting end, a phase jumper at a receiving end, and a GNSS time-frequency transfer receiver of a national atomic time scale measurement reference according to an embodiment of the present invention;
fig. 4 is a block diagram of a fiber one-way time-frequency transmission system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited correspondingly. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
The following describes a method for unidirectional time frequency transmission of an optical fiber according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a flow chart of a method for unidirectional time frequency transmission of an optical fiber according to an embodiment of the present invention. As shown in fig. 1, an optical fiber one-way time frequency transmission method includes the following steps:
s1: an electrical signal containing frequency information of a transmitting-side reference time frequency source is converted into an optical signal.
In an embodiment of the present invention, the structure of the transmission system in the optical fiber one-way time frequency transmission method is shown in fig. 2, and a reference signal frequency (5 or 10MHz) signal of the chinese metrological academy of sciences (and plains) (transmitting end) is converted into an optical signal through an electro-optical conversion device
S2: the receiving end receives the optical signal through the optical fiber link.
S3: the receiving end converts the optical signal into an electrical signal through the photoelectric conversion module.
S4: and the receiving end recovers the signal by using the phase micro-jump device according to the electric signal to generate a time frequency signal, and measures the time difference between the reference time signal of the transmitting end and the time signal generated by the receiving end so as to obtain the time frequency information of the time frequency source of the transmitting end.
Specifically, the receiving end accesses the electric signal into a phase micro-jump device as a reference, the frequency of the phase micro-jump device is locked to the reference signal, and a time signal and a frequency signal are generated.
In one embodiment of the invention, time-frequency information of the time-frequency source of the transmitting end is obtained from the electrical signal using a frequency distribution amplifier.
Specifically, after obtaining the electrical signal of the frequency, the frequency distribution amplifier distributes the frequency signal directly, and meanwhile, one path of output of the distribution amplifier generates the time signal through the frequency divider.
S5: and according to the time-frequency information of the time frequency source of the transmitting end and the calibrated optical fiber transmission link between the receiving end and the transmitting end, taming the time frequency source of the receiving end so as to synchronize the time frequency source of the receiving end and the time frequency source of the transmitting end.
In an embodiment of the invention, the calibrated optical fiber transmission link between the receiving end and the transmitting end includes a first GNSS time-frequency transfer receiver and a second GNSS time-frequency transfer receiver. The first GNSS time-frequency transfer receiver is connected with a time frequency source of the transmitting end. And the second GNSS time-frequency transfer receiver is connected with a time frequency source of the receiving end. The first GNSS time-frequency transfer receiver and the second GNSS time-frequency transfer receiver are synchronous.
In one embodiment of the present invention, the calibrated optical fiber transmission link between the receiving end and the transmitting end comprises a first optical fiber time frequency comparison device and a second optical fiber time frequency comparison device. The first optical fiber time frequency comparison equipment is connected with a time frequency source of the transmitting end. The second optical fiber time frequency comparison equipment is connected with a time frequency source of the receiving end. The first optical fiber time frequency comparison equipment and the second optical fiber time frequency comparison equipment are synchronous.
In one example of the invention, the transmitting end is the atomic time scale UTC (NIM) located in China institute of metrological sciences and the plain parkHepingliIM2P and IM20 refer to UTC (NIM) at the transmitting end respectivelyHepingliAnd two GNSS time frequency transfer receivers of the remote end phase micro-jump device signal, the GNSS time transfer link formed by the two GNSS time frequency transfer receivers is calibrated, and the result of the calibration (common view comparison) of the two GNSS time frequency transfer receivers to the optical fiber link can be calculated to be 204.2 ns.
Further, UTC (NIM) may be obtained separately using as a common reference a GNSS time-frequency delivery receiver IM06 connected to the national atomic time-scale metering reference (UTC (NIM))HepingliComparing the transmitting end and the receiving end with UTC (NIM) (IM2P-IM06 and IM20-IM06), and simultaneously comparing IM2P with IM20 (i.e. UTC (NIM))HepingliLocal end and remote end) to perform direct common-view comparison, and selecting MJD 57590-57596 time period to obtain the original result as follows.
Fig. 3 is a diagram illustrating comparison results of the phase jumper at the transmitting end, the phase jumper at the receiving end, and a GNSS time-frequency transfer receiver of a national atomic time scale metric reference according to an embodiment of the present invention. As shown in fig. 3, IM2P and IM20 compare the results with IM06, respectively (sometimes difference and frequency difference, respectively, the frequency difference is calculated by time difference).
The comparison result chart shows that the time difference curves of IM2P-IM06 and IM20-IM06 have basically consistent trends, the average value error of the relative frequency deviation can be ignored, the average value of the IM2P-IM20 results is stabilized in a fixed range, the fluctuation is about 4ns, the standard deviation is about 1ns, and the relative frequency deviation is 4.84e-16Left and right.
The optical fiber unidirectional time frequency transmission method of the embodiment of the invention can be considered that UTC (NIM) can be transmitted to a far end through an optical fiber, namely, a time frequency signal realized by the far end is synchronous with a local end, and the method has better accuracy and stability.
In addition, the invention also discloses an optical fiber one-way time frequency transmission system, which comprises a transmitting end 210, a first optical link 220 and a receiving end 230.
The transmitting end 210 is configured to convert an electrical signal of frequency information of a transmitting end reference time frequency source into an optical signal.
The transmitting end 210 and the receiving end 230 are connected by a first optical transmission link 220.
The receiving end 230 includes: an optical signal receiving module 231, a photoelectric conversion module 232, a phase microswitcher 233, a time-frequency information generating module 234, and a taming module 235. The optical signal receiving module 231 is configured to obtain, through the first optical fiber link 220, an optical signal that includes frequency information of a time frequency source of the transmitting end and is sent by the transmitting end. The photoelectric conversion module 232 is used for converting the optical signal into an electrical signal. The phase shifter 233 is used to recover the signal from the electrical signal and generate a time frequency signal. The time-frequency information generating module 234 is configured to measure a time difference between a reference time signal of a transmitting end and a time signal generated by the receiving end, so as to obtain time-frequency information of a time-frequency source of the transmitting end. The taming module 235 is configured to taminate the time frequency source of the receiving end according to the time frequency information of the time frequency source of the transmitting end and the calibrated second optical fiber transmission link between the receiving end and the transmitting end, so that the time frequency source of the receiving end and the time frequency source of the transmitting end are synchronized.
The optical fiber unidirectional time frequency transmission system of the embodiment of the invention utilizes the calibrated time transmission link and taminates the time frequency source of the receiving end according to the time frequency information of the time frequency source of the transmitting end, which is acquired and read by the optical fiber link, so that the time frequency source of the receiving end and the time frequency source of the transmitting end are synchronous, and the accuracy and the stability are better.
In one embodiment of the invention, the time frequency information generation module 234 is a frequency allocation amplifier.
In one embodiment of the invention, the second optical fiber transmission link comprises a first GNSS time-frequency transfer receiver and a second GNSS time-frequency transfer receiver. The first GNSS time-frequency transfer receiver is connected with a time frequency source of the transmitting end. And the second GNSS time-frequency transfer receiver is connected with a time frequency source of the receiving end. The first GNSS time-frequency transfer receiver and the second GNSS time-frequency transfer receiver are synchronous.
In one embodiment of the invention, the second optical fiber transmission link comprises a first optical fiber time frequency comparison device and a second optical fiber time frequency comparison device. The first optical fiber time frequency comparison equipment is connected with a time frequency source of the transmitting end. The second optical fiber time frequency comparison equipment is connected with a time frequency source of the receiving end. The first optical fiber time frequency comparison equipment and the second optical fiber time frequency comparison equipment are synchronous.
It should be noted that the specific implementation of the optical fiber one-way time frequency transmission system in the embodiment of the present invention is similar to the specific implementation of the optical fiber one-way time frequency transmission method in the embodiment of the present invention, and specific reference is specifically made to the description of the method portion, and details are not described here in order to reduce redundancy.
In addition, other structures and functions of the optical fiber unidirectional time frequency transmission system and method according to the embodiments of the present invention are known to those skilled in the art, and are not described in detail for reducing redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. An optical fiber one-way time frequency transmission method is characterized by comprising the following steps:
s1: converting an electrical signal containing frequency information of a transmitting-end reference time frequency source into an optical signal;
s2: the receiving end receives the optical signal through an optical fiber link;
s3: converting the optical signal into the electrical signal;
s4: the receiving end recovers signals by using a phase micro-jump device according to the electric signals to generate time frequency signals, and the time difference between the reference time signals of the transmitting end and the time signals generated by the receiving end is measured, so that the time frequency information of the time frequency source of the transmitting end is obtained;
s5: according to the time-frequency information of the time frequency source of the transmitting end and the calibrated optical fiber transmission link between the receiving end and the transmitting end, disciplining the time frequency source of the receiving end so as to synchronize the time frequency source of the receiving end and the time frequency source of the transmitting end;
wherein the calibrated optical fiber transmission link between the receiving end and the transmitting end comprises:
the first GNSS time-frequency transfer receiver is connected with the time frequency source of the transmitting terminal;
the second GNSS time-frequency transfer receiver is connected with the time frequency source of the receiving end;
wherein the first GNSS time-frequency transfer receiver and the second GNSS time-frequency transfer receiver are synchronized.
2. The optical fiber unidirectional time frequency transmission method according to claim 1, wherein in step S4, time-frequency information of the time-frequency source of the transmitting end is obtained from the electrical signal by using a frequency distribution amplifier.
3. An optical fiber one-way time-frequency transmission system, comprising:
the transmitting terminal is used for converting an electric signal of frequency information of a transmitting terminal reference time frequency source into an optical signal;
the transmitting end and the receiving end are connected through the first optical fiber transmission link;
the receiving end, wherein the receiving end includes:
an optical signal receiving module, configured to receive the optical signal through the first optical fiber link;
the photoelectric conversion module is used for converting the optical signal into an electric signal;
the phase micro-jump device is used for recovering signals according to the electric signals and generating time frequency signals;
the time-frequency information generating module is used for measuring the time difference between a reference time signal of a transmitting end and a time signal generated by the receiving end so as to obtain the time-frequency information of a time-frequency source of the transmitting end;
the taming module is used for taming the time frequency source of the receiving end according to the time frequency information of the time frequency source of the transmitting end and the calibrated second optical fiber transmission link between the receiving end and the transmitting end so as to synchronize the time frequency source of the receiving end with the time frequency source of the transmitting end;
the second optical transmission link includes:
the first GNSS time-frequency transfer receiver is connected with the time frequency source of the transmitting terminal;
the second GNSS time-frequency transfer receiver is connected with the time frequency source of the receiving end;
wherein the first GNSS time-frequency transfer receiver and the second GNSS time-frequency transfer receiver are synchronized.
4. The fiber optic unidirectional time frequency transmission system of claim 3, wherein the time-frequency information generating module is a frequency distribution amplifier.
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| CN110752877B (en) * | 2019-11-04 | 2021-12-07 | 深圳市慧宇系统有限公司 | System and method for transmitting time frequency signal in optical fiber |
| CN111147150B (en) * | 2019-12-18 | 2023-02-07 | 上海交通大学 | Distributed optical frequency transmission device and transmission method based on passive phase compensation |
| CN110995389B (en) * | 2019-12-23 | 2021-07-27 | 电信科学技术第五研究所有限公司 | Optical fiber one-way time-frequency synchronization signal transmission method, device, medium and equipment |
| CN111698032B (en) * | 2020-06-16 | 2021-04-20 | 中国科学院国家授时中心 | Single-fiber one-way time transmission method and system |
| CN112398531B (en) * | 2020-11-03 | 2021-12-10 | 中国科学院上海天文台 | Sagnac time delay correction method and system for optical fiber time-frequency transmission of dead path information |
| CN114978400B (en) * | 2022-05-20 | 2022-12-20 | 中国计量科学研究院 | System and method for calibrating time delay of optical fiber bidirectional time comparison link |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0935356A2 (en) * | 1998-02-09 | 1999-08-11 | Nec Corporation | System for monitoring a digital bidirectional optical communication line |
| CN102801469A (en) * | 2012-09-11 | 2012-11-28 | 中国人民解放军理工大学 | Optical fiber time frequency hybrid transmission method |
| CN103226324A (en) * | 2013-03-06 | 2013-07-31 | 中国计量科学研究院 | High-precision time-frequency source capable of being tamed to time-frequency standard in real time |
| CN104954093A (en) * | 2015-06-29 | 2015-09-30 | 北京无线电计量测试研究所 | High-precision remote time transmission system and method based on optical fibers |
| CN103812553B (en) * | 2014-02-18 | 2017-01-04 | 上海交通大学 | High-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299743B (en) * | 2011-09-23 | 2014-06-11 | 中国科学院国家授时中心 | Post-compensation method for transmission time delay during optical fiber time transmission |
| CN102340354A (en) * | 2011-09-23 | 2012-02-01 | 中国科学院国家授时中心 | Method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing |
| CN103546224B (en) * | 2013-10-11 | 2016-06-29 | 成都泰富通信有限公司 | Single-fiber ultrahigh-precision time transmission method |
-
2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0935356A2 (en) * | 1998-02-09 | 1999-08-11 | Nec Corporation | System for monitoring a digital bidirectional optical communication line |
| CN102801469A (en) * | 2012-09-11 | 2012-11-28 | 中国人民解放军理工大学 | Optical fiber time frequency hybrid transmission method |
| CN103226324A (en) * | 2013-03-06 | 2013-07-31 | 中国计量科学研究院 | High-precision time-frequency source capable of being tamed to time-frequency standard in real time |
| CN103812553B (en) * | 2014-02-18 | 2017-01-04 | 上海交通大学 | High-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method |
| CN104954093A (en) * | 2015-06-29 | 2015-09-30 | 北京无线电计量测试研究所 | High-precision remote time transmission system and method based on optical fibers |
Non-Patent Citations (1)
| Title |
|---|
| Łukasz Sliwczynski等.Optical fibers in time and frequency transfer.《MEASUREMENT SCIENCE AND TECHNOLOGY》.2010, * |
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