CN110808790B - Multi-user quantum time synchronization method and system based on time division multiplexing - Google Patents
Multi-user quantum time synchronization method and system based on time division multiplexing Download PDFInfo
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- CN110808790B CN110808790B CN201911066975.3A CN201911066975A CN110808790B CN 110808790 B CN110808790 B CN 110808790B CN 201911066975 A CN201911066975 A CN 201911066975A CN 110808790 B CN110808790 B CN 110808790B
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
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- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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- H04J3/00—Time-division multiplex systems
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
Abstract
The invention discloses a multi-user quantum time synchronization method and a system based on time division multiplexing, comprising the following steps: the time frequency source outputs a reference frequency signal and a reference time signal; the fiber frequency transmission transmitter receives the reference frequency signal and transmits the reference frequency signal to n user terminals, wherein n is a positive integer greater than or equal to 2; receiving a reference time signal through a quantum bidirectional comparison automatic switching module of a transmitting terminal, transmitting the reference time signal to n user terminals, and obtaining a clock error t between a user terminal i and a time frequency source in a quantum bidirectional time comparison mode0i(ii) a The operation control unit i of the user terminal i is based on the clock difference t0iAdjusting the programmable delay i by t0i(ii) a Inputting a frequency signal i obtained by a user terminal i into a frequency divider i to obtain a time signal i; and inputting the time signal i into a programmable delayer i for delay processing to obtain an output time signal i of the user terminal i. The invention can realize the quantum time synchronization of multiple users and can ensure the high precision and the high reliability of the time synchronization.
Description
Technical Field
The invention belongs to the technical field of time frequency, relates to a multi-site quantum time synchronization method, and particularly relates to a multi-user quantum time synchronization method and system based on time division multiplexing.
Background
In the fields of aerospace, radar synchronization, tip weapon control, high-speed communication, deep space exploration and the like, high requirements on time synchronization are provided. The current long wave time service can only reach microsecond synchronization precision, the satellite common view can only reach nanosecond synchronization precision, and the optical fiber time synchronization method and the satellite bidirectional comparison method can only reach hundred picosecond synchronization precision. The quantum time synchronization technology can improve the time synchronization precision to the sub-picosecond or even femtosecond magnitude, so the quantum time synchronization method has wide application prospect.
In time application, synchronization among multiple stations, such as synchronization among multiple radar fixed stations, synchronization among multiple observation stations, and the like, is often required. Most of the current time synchronization schemes are cascaded multi-sites, and a large amount of time synchronization calibration equipment is needed; the transmission is carried out by one stage of the receiving station along the way, and errors are introduced in the cascade transmission process; the multi-stage cascade also has accumulated errors, which reduces the accuracy and stability of the transmitted time signal.
In summary, a new method and system for multi-user quantum time synchronization based on time division multiplexing are needed.
Disclosure of Invention
The present invention is directed to a method and system for multi-user quantum time synchronization based on time division multiplexing, so as to solve one or more of the above technical problems. The invention adopts the quantum light source as a carrier of the time signal, can realize the quantum time synchronization of multiple users, and can ensure the high precision and the stability of the time synchronization.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a multi-user quantum time synchronization method based on time division multiplexing, which comprises the following steps:
outputting a reference frequency signal and a reference time signal through a time frequency source of a transmitting terminal;
receiving the reference frequency signal through an optical fiber frequency transmission transmitter at a transmitting end, and respectively transmitting the reference frequency signal to n user ends through n frequencies and data transmission links, wherein n is a positive integer greater than or equal to 2; a user terminal i obtains a frequency signal i with a stable relative phase relation with a transmitting terminal, wherein i is more than or equal to 1 and less than or equal to n;
receiving the reference time signal through a quantum bidirectional comparison automatic switching module of a transmitting terminal, respectively transmitting the reference time signal to n user terminals through n quantum bidirectional transmission links, and obtaining the clock error t between the user terminal i and a time frequency source in a quantum bidirectional time comparison mode0i；
The operation control unit i of the user terminal i is based on the clock difference t0iAdjusting the programmable delay i by t0i；
Inputting a frequency signal i obtained by a user terminal i into a frequency divider i to obtain a time signal i; and inputting the time signal i into a programmable delayer i for delay processing to obtain an output time signal i of the user terminal i.
The invention has the further improvement that the quantum bidirectional comparison automatic switching module adopts a time division multiplexing mode to carry out quantum bidirectional time comparison on n user side circulation.
The invention has the further improvement that the quantum bidirectional comparison automatic switching module comprises: the quantum bidirectional comparison transmitting terminal and the automatic switching circuit; each user side all includes: quantum bidirectional comparison receiving end; the quantum bidirectional comparison transmitting terminal is used for receiving the reference time signal and transmitting the reference time signal to the quantum bidirectional comparison receiving terminal of each user terminal through the automatic switching circuit and the quantum bidirectional transmission link.
The invention is further improved in that the time frequency source outputs 10MHz frequency signals to the fiber frequency transmission transmitter at the transmitting end;
n＝3；
obtaining a 10MHz frequency signal with stable phase relation with a transmitting end at each user end;
the frequency stability superior to E-17/s can be achieved.
The invention relates to a multi-user quantum time synchronization system based on time division multiplexing, which comprises:
a time frequency source for outputting a reference frequency signal and a reference time signal;
the optical fiber frequency transmission transmitter is used for receiving the reference frequency signal and respectively transmitting the reference frequency signal to n user sides through n frequency and data transmission links, wherein n is a positive integer greater than or equal to 2; a user terminal i obtains a frequency signal i with a stable relative phase relation with a transmitting terminal, wherein i is more than or equal to 1 and less than or equal to n;
the quantum bidirectional comparison automatic switching module is used for receiving the reference time signal, transmitting the reference time signal to n user ends through n quantum bidirectional transmission links respectively, and obtaining the clock error t between the user end i and the time frequency source in a quantum bidirectional time comparison mode0i；
An operation control unit i of the user terminal i for controlling the operation according to the clock difference t0iAdjusting the programmable delay i by t0i；
The frequency divider i of the user terminal i is used for inputting a frequency signal i obtained by the user terminal i and obtaining a time signal i;
a programmable delayer i of the user terminal i for adjusting the amount t0iAnd carrying out delay processing on the input time signal i to obtain an output time signal i of the user terminal i.
The invention has the further improvement that the quantum bidirectional comparison automatic switching module adopts a time division multiplexing mode to carry out quantum bidirectional time comparison on n user side circulation.
The invention has the further improvement that the quantum bidirectional comparison automatic switching module comprises: the quantum bidirectional comparison transmitting terminal and the automatic switching circuit;
each user side all includes: quantum bidirectional comparison receiving end;
the quantum bidirectional comparison transmitting terminal is used for receiving the reference time signal and transmitting the reference time signal to the quantum bidirectional comparison receiving terminal of each user terminal through the automatic switching circuit and the quantum bidirectional transmission link.
A further improvement of the present invention is that each user terminal comprises: the system comprises an optical fiber frequency transmission receiver, a frequency divider, a programmable delayer, an operation control unit and a quantum bidirectional comparison receiving end.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a high-precision multi-user quantum time synchronization method based on time division multiplexing, aiming at overcoming the defects of lower accuracy and stability in the prior art. Specifically, on the basis of optical fiber frequency transmission, the invention combines the high stability of optical fiber frequency transmission and the high accuracy of quantum time synchronization, adopts an automatic switching circuit to carry out quantum bidirectional comparison on each user terminal in a time division multiplexing mode, can realize high-accuracy high-stability multi-user quantum time synchronization, and can eliminate cascade accumulated errors introduced in the traditional cascade scheme.
The method of the invention can achieve the frequency stability superior to E-17/s.
The system of the invention adopts the quantum light source as a carrier of the time signal, can realize the quantum time synchronization of multiple users and ensure the high precision and the high reliability of the time synchronization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a multi-user quantum time synchronization system based on time division multiplexing according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a transmitting end and a user end according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
The embodiment of the invention provides a multi-user quantum time synchronization method based on time division multiplexing, which comprises the following steps:
1) the time frequency source outputs a reference frequency signal to the transmitting end optical fiber frequency transmission transmitter, and the reference frequency signal is transmitted to the optical fiber frequency transmission receivers of n user ends through the frequency and data transmission link, so that a frequency signal with a stable relative phase relation with the transmitting end is obtained at each user end;
2) the frequency signal obtained by the user terminal 1 passes through a frequency divider of the user terminal 1 to obtain a time signal;
3) step 2) the time signal is delayed by a programmable delayer and then the time signal of the user side 1 is output;
4) the time frequency source outputs a reference time signal to the quantum bidirectional comparison transmitting terminal;
5) the quantum bidirectional comparison receiving terminal 1 inputs the time signal of the user terminal 1 in the step 3) to the quantum bidirectional comparison receiving terminal 1;
6) clock error t between the user terminal 1 and the time frequency source is obtained by quantum bidirectional time comparison0；
7) The operation control unit of the user end 1 measures the clock difference t according to the step 6)0Adjusting the programmable delay of the client 1 by t0；
So far, the time signal of the user terminal 1 and the time signal of the time frequency source are synchronized.
8) The transmitting terminal carries out quantum bidirectional time comparison on n user terminal cycles in a time division multiplexing mode through controlling the automatic switching module, and realizes synchronization of the time signals of the rest n-1 user terminals and the time frequency source time signals according to the same method as the user terminal 1.
The method combines the high stability of optical fiber frequency transmission and the high accuracy of quantum time synchronization on the basis of optical fiber frequency transmission, adopts an automatic switching circuit to carry out quantum bidirectional comparison on each user side in a time division multiplexing mode, realizes the high-accuracy high-stability multi-user quantum time synchronization, and eliminates the cascade accumulated error introduced in the traditional cascade scheme. Wherein, the automatic switching circuit can be realized by a polling mode.
Referring to fig. 1, fig. 1 shows an overall structure of an embodiment of the present invention. The embodiment of the invention provides a multi-user quantum time synchronization system based on time division multiplexing, which comprises: the system comprises a time frequency source, an optical fiber frequency transmission transmitter, a quantum bidirectional comparison automatic switching module and each user side.
Referring to fig. 2, fig. 2 shows an internal node of a transmitting end and a user end according to an embodiment of the present invention. In the system of the invention, the quantum bidirectional comparison automatic switching module comprises: the quantum bidirectional comparison transmitting terminal and the automatic switching circuit; each client module includes: the system comprises an optical fiber frequency transmission receiver, a frequency divider, a programmable delayer, an operation control unit and a quantum bidirectional comparison receiving end.
The embodiment of the invention provides a multi-user quantum time synchronization system based on time division multiplexing, which comprises:
a time frequency source for outputting a reference frequency signal and a reference time signal;
the optical fiber frequency transmission transmitter is used for receiving the reference frequency signal and respectively transmitting the reference frequency signal to n user sides through n frequency and data transmission links, wherein n is a positive integer greater than or equal to 2; a user terminal i obtains a frequency signal i with a stable relative phase relation with a transmitting terminal, wherein i is more than or equal to 1 and less than or equal to n;
the quantum bidirectional comparison automatic switching module is used for receiving the reference time signal, transmitting the reference time signal to n user ends through n quantum bidirectional transmission links respectively, and obtaining the clock error t between the user end i and the time frequency source in a quantum bidirectional time comparison mode0i；
An operation control unit i of the user terminal i for controlling the operation according to the clock difference t0iAdjusting the programmable delay i by t0i；
The frequency divider i of the user terminal i is used for inputting a frequency signal i obtained by the user terminal i and obtaining a time signal i;
a programmable delayer i of the user terminal i for adjusting the amount t0iTo each otherAnd carrying out delay processing on the incoming time signal i to obtain an output time signal i of the user terminal i.
Examples
The embodiment of the invention provides a multi-user quantum time synchronization method based on time division multiplexing, which specifically comprises the following steps:
the reference frequency signal output by the time frequency source is 10MHz, and the reference time signal output by the time frequency source is 1PPS signal.
And obtaining a 10MHz frequency signal with stable relative phase relation with the transmitting end at the user end, wherein the 10MHz frequency obtained by the user end passes through a frequency divider to obtain a 1PPS signal.
1) The time frequency source outputs 10MHz frequency signals to a transmitting end optical fiber frequency transmission transmitter, and the signals are transmitted to n optical fiber frequency transmission receivers of user ends through a frequency and data transmission link, wherein n is 3, and 10MHz frequency signals with stable phase relation with the transmitting end are obtained at each user end;
2) the 10MHz frequency signal obtained by the user terminal 1 passes through a frequency divider of the user terminal 1 to obtain a 1PPS signal;
3) the 1PPS signal of the user end 1 is output after the time-delay of the time-1 PPS signal in the step 2) is delayed by a programmable delayer;
4) the time frequency source outputs a reference 1PPS signal to a quantum bidirectional comparison transmitting terminal;
5) the quantum bidirectional comparison receiving terminal 1 inputs the 1PPS signal of the user terminal 1 in the step 3) to the quantum bidirectional comparison receiving terminal 1;
6) clock error t between the user terminal 1 and the time frequency source is obtained by quantum bidirectional time comparison0；
7) The operation control unit of the user end 1 measures the clock difference t according to the step 6)0Adjusting the programmable delay of the client 1 by t0；
So far, the 1PPS signal of the user terminal 1 and the 1PPS signal of the time frequency source realize synchronization.
8) And the transmitting end controls the automatic switching module to perform quantum bidirectional time comparison on the 3 user end rounds in a time division multiplexing mode, and realizes the synchronization of the PPS signals of the rest n-1 user ends 1 and the PPS signals of the time frequency source 1 according to the same method as the user end 1.
Therefore, the synchronization of the PPS signals of each user terminal 1 and the PPS signals of the time frequency source 1 is realized, and the frequency stability superior to E-17/s can be achieved.
In summary, the present invention provides a high-precision multi-user quantum time synchronization method and system based on time division multiplexing, in order to overcome the disadvantages of the prior art, and the present invention adopts a quantum light source as a carrier of a time signal, so that multi-user quantum time synchronization can be realized, and high precision and high reliability of time synchronization can be ensured. On the basis of optical fiber frequency transmission, the invention combines the high stability of optical fiber frequency transmission and the high accuracy of quantum time synchronization, adopts an automatic switching circuit to carry out quantum bidirectional comparison on each user terminal in a time division multiplexing mode, realizes the high-accuracy high-stability multi-user quantum time synchronization, and eliminates the cascade accumulated error introduced in the traditional cascade scheme.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (4)
1. A multi-user quantum time synchronization method based on time division multiplexing is characterized by comprising the following steps:
outputting a reference frequency signal and a reference time signal through a time frequency source of a transmitting terminal;
receiving the reference frequency signal through an optical fiber frequency transmission transmitter at a transmitting end, and respectively transmitting the reference frequency signal to n user ends through n frequencies and data transmission links, wherein n is a positive integer greater than or equal to 2; a user terminal i obtains a frequency signal i with a stable relative phase relation with a transmitting terminal, wherein i is more than or equal to 1 and less than or equal to n;
receiving the reference by a quantum bidirectional comparison automatic switching module of a transmitting terminalTime signals are respectively transmitted to n user ends through n quantum bidirectional transmission links, and clock error t between a user end i and a time frequency source is obtained through a quantum bidirectional time comparison mode0i；
The operation control unit i of the user terminal i is based on the clock difference t0iAdjusting the programmable delay i by t0i；
Inputting a frequency signal i obtained by a user terminal i into a frequency divider i to obtain a time signal i; inputting the time signal i into a programmable delayer i for delay processing to obtain an output time signal i of a user terminal i;
the quantum bidirectional comparison automatic switching module carries out quantum bidirectional time comparison on n user side circulation in a time division multiplexing mode;
the quantum bidirectional comparison automatic switching module comprises: the quantum bidirectional comparison transmitting terminal and the automatic switching circuit;
each user side all includes: quantum bidirectional comparison receiving end;
the quantum bidirectional comparison transmitting terminal is used for receiving the reference time signal and transmitting the reference time signal to the quantum bidirectional comparison receiving terminal of each user terminal through the automatic switching circuit and the quantum bidirectional transmission link.
2. The time division multiplexing-based multi-user quantum time synchronization method according to claim 1, wherein the time frequency source outputs 10MHz frequency signals to the fiber frequency transmission transmitter at the transmitting end;
n＝3；
obtaining a 10MHz frequency signal with stable phase relation with a transmitting end at each user end;
the frequency stability superior to E-17/s can be achieved.
3. A multi-user quantum time synchronization system based on time division multiplexing is characterized by comprising:
a time frequency source for outputting a reference frequency signal and a reference time signal;
the optical fiber frequency transmission transmitter is used for receiving the reference frequency signal and respectively transmitting the reference frequency signal to n user sides through n frequency and data transmission links, wherein n is a positive integer greater than or equal to 2; a user terminal i obtains a frequency signal i with a stable relative phase relation with a transmitting terminal, wherein i is more than or equal to 1 and less than or equal to n;
the quantum bidirectional comparison automatic switching module is used for receiving the reference time signal, transmitting the reference time signal to n user ends through n quantum bidirectional transmission links respectively, and obtaining the clock error t between the user end i and the time frequency source in a quantum bidirectional time comparison mode0i；
An operation control unit i of the user terminal i for controlling the operation according to the clock difference t0iAdjusting the programmable delay i by t0i；
The frequency divider i of the user terminal i is used for inputting a frequency signal i obtained by the user terminal i and obtaining a time signal i;
a programmable delayer i of the user terminal i for adjusting the amount t0iCarrying out delay processing on an input time signal i to obtain an output time signal i of a user terminal i;
the quantum bidirectional comparison automatic switching module carries out quantum bidirectional time comparison on n user side circulation in a time division multiplexing mode;
the quantum bidirectional comparison automatic switching module comprises: the quantum bidirectional comparison transmitting terminal and the automatic switching circuit;
each user side all includes: quantum bidirectional comparison receiving end;
the quantum bidirectional comparison transmitting terminal is used for receiving the reference time signal and transmitting the reference time signal to the quantum bidirectional comparison receiving terminal of each user terminal through the automatic switching circuit and the quantum bidirectional transmission link.
4. The system according to claim 3, wherein each user terminal comprises: the system comprises an optical fiber frequency transmission receiver, a frequency divider, a programmable delayer, an operation control unit and a quantum bidirectional comparison receiving end.
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