CN115694633A - Feasibility engineering verification method and system for Sagnac effect time deviation correction model - Google Patents
Feasibility engineering verification method and system for Sagnac effect time deviation correction model Download PDFInfo
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Abstract
The invention discloses a feasibility engineering verification method and a system of a Sagnac effect time deviation correction model, wherein the method comprises the following steps: carrying out fixed time delay calibration on each device in the optical fiber time transmission system at the same preset place to obtain calibrated devices; respectively obtaining a laboratory optical fiber test result and a field optical fiber test result; acquiring actual measurement Sagnac time deviation values of all the sites based on laboratory optical fiber test results and field optical fiber test results; acquiring theoretical Sagnac time deviation values of all the sites; and comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site to realize the verification of the Sagnac effect time deviation correction model. The method can verify the accuracy of the Sagnac effect time deviation correction theoretical model in the long-distance optical fiber time transmission link.
Description
Technical Field
The invention belongs to the technical field of time frequency, relates to the field of long-distance optical fiber time transmission, and particularly relates to a feasibility engineering verification method and a feasibility engineering verification system for a Sagnac effect time deviation correction model.
Background
High-precision time frequency signals play an important role in the fields of scientific research, social application, national defense construction and the like; the optical fiber time transmission is a main mode of high-precision time transmission gradually due to the advantages of high precision, high reliability, strong anti-impact capability, better compatibility with an optical fiber communication system, long transmission distance and the like facing to the construction of a high-precision time-frequency system. The premise of a high-precision optical fiber time transmission mode is that the time delay of the bidirectional transmission of the optical fiber link is completely symmetrical or the difference value of the time delay can be accurately measured and compensated; therefore, the asymmetry of the bidirectional transmission delay is a major factor affecting the accuracy and stability of long-distance optical fiber time transmission.
The Sagnac effect brought by the earth rotation can influence the symmetry of transmission delay of a round-trip link, and the time delay difference cannot be directly measured; specifically, it is explained that if two beams travel along the same path of a rotating disk, one clockwise and one counterclockwise, they will complete the loop at different times, which is the Sagnac effect. In the optical fiber time transmission system, because optical fibers are laid along the surface of the earth, the propagation delay of light in a round-trip link is different due to the Sagnac effect caused by the rotation of the earth, the symmetry of the link delay is damaged, time transmission deviation is caused, the Sagnac effect in a long-distance optical fiber time transmission link may introduce time deviation of more than one nanosecond, and the time deviation caused by the Sagnac effect cannot be ignored in the construction of a plurality of subsequent long-distance optical fiber time transmission links.
Because large-scale long-distance optical fiber time transmission engineering is not developed in the world, enough data for looking up is not available at present, and actual engineering tests are not carried out; with the construction of a new generation of high-precision optical fiber time transmission system, a Sagnac effect time deviation correction theoretical model in a long-distance optical fiber time transmission link needs to be verified for accuracy, and a feasible engineering verification method for the Sagnac effect time deviation correction model in long-distance optical fiber time transmission is needed.
Disclosure of Invention
The invention aims to provide a method and a system for verifying feasibility engineering of a Sagnac effect time deviation correction model, so as to solve one or more technical problems. The method or the system provided by the invention can verify the accuracy of the Sagnac effect time deviation correction theoretical model in the long-distance optical fiber time transmission link.
In order to achieve the purpose, the invention adopts the following technical scheme:
the embodiment of the invention provides a feasibility engineering verification method of a Sagnac effect time deviation correction model, which comprises the following steps:
carrying out fixed time delay calibration on each device in the optical fiber time transmission system at the same preset place to obtain calibrated devices;
respectively acquiring a laboratory optical fiber test result and a field optical fiber test result based on the calibrated equipment;
acquiring actual measurement Sagnac time deviation values of all the sites based on laboratory optical fiber test results and field optical fiber test results; acquiring theoretical Sagnac time deviation values of all the sites based on a Sagnac effect time deviation correction model;
and comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site to verify the Sagnac effect time deviation correction model.
A further improvement of the present invention is that, the calibrating of the fixed time delay of each device in the optical fiber time transfer system at the preset same location, and the obtaining of the calibrated device specifically includes:
and carrying out fixed time delay calibration on each device in the optical fiber time transmission system at a preset same place, and adjusting the time deviation central value of each remote end device and the local end device within a preset interval close to a 0 value to obtain the calibrated device.
In a further improvement of the present invention, the calibration-based device is configured to obtain laboratory fiber test results and field fiber test results respectively,
when laboratory optical fiber test results are obtained, simulating a field optical fiber link by adopting laboratory fiber coiling according to the actual test link condition; the local end device, the remote end 1 device, the remote end 2 device, the remote end 8230, the remote end m device, the remote end 8230, the remote end n device are sequentially connected in series through the coiled fibers, and the lengths of the coiled fibers among the devices are the same as the lengths of the optical fiber links among the devices in a field optical fiber link;
when a field optical fiber test result is obtained, in a field link test, the condition that corresponding position equipment of each site is the same as corresponding position equipment in laboratory fiber coiling simulation is guaranteed, and local end equipment, remote end 1 equipment, remote end 2 equipment, 8230, remote end m equipment, remote end 8230, remote end n equipment are connected in series in sequence through a field link.
The invention has the further improvement that based on laboratory optical fiber test results and field optical fiber test results, actual measurement Sagnac time deviation values of all the sites are obtained; in the process of acquiring the theoretical Sagnac time deviation value of each site based on the Sagnac effect time deviation correction model,
for site n, the measured Sagnac time service deviation is 1/2 (T) n ’-T n ) (ii) a Wherein, T n The method comprises the steps that a central value of time deviation between remote end n equipment and local end equipment is transmitted by remote end 1 equipment, \8230 \ by remote end n-1 equipment when laboratory fiber coiling simulation is carried out; t is n The method comprises the steps that a central value of time deviation between remote end n equipment and local end equipment is transmitted by remote end 1 equipment, \8230 \ remote end n-1 equipment during field optical fiber testing;
for site n, the theoretical Sagnac time service deviation is T 0n The verification method is obtained by calculation according to the on-site optical fiber link trend, the station n longitude and latitude and the model to be verified.
The invention provides a feasibility engineering verification system of a Sagnac effect time deviation correction model, which comprises:
the calibration module is used for carrying out fixed time delay calibration on each device in the optical fiber time transmission system at a preset same place to obtain calibrated devices;
the test result acquisition module is used for respectively acquiring a laboratory optical fiber test result and a field optical fiber test result based on the calibrated equipment;
the Sagnac time deviation value acquisition module is used for acquiring the actual measurement Sagnac time deviation value of each station based on the laboratory optical fiber test result and the field optical fiber test result; acquiring theoretical Sagnac time deviation values of all the sites based on a Sagnac effect time deviation correction model;
and the verification module is used for comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site, so as to realize the verification of the Sagnac effect time deviation correction model.
A further improvement of the present invention is that, the calibrating of the fixed time delay of each device in the optical fiber time transfer system at the preset same location, and the obtaining of the calibrated device specifically includes:
and carrying out fixed time delay calibration on each device in the optical fiber time transmission system at the same preset place, and adjusting the time deviation central value of each remote end device and the local end device within a preset interval close to a 0 value to obtain calibrated devices.
In the process of respectively acquiring the laboratory optical fiber test result and the field optical fiber test result based on the calibrated equipment,
when laboratory optical fiber test results are obtained, simulating a field optical fiber link by adopting laboratory fiber coiling according to the actual test link condition; wherein, local end equipment, remote end 1 equipment, remote end 2 equipment, \8230;, remote end m equipment, \8230;, remote end n equipment are connected in series in sequence through coiled fiber, the lengths of the optical fiber coils among the devices are the same as the lengths of the optical fiber links among the devices in the field optical fiber link;
when a field optical fiber test result is obtained, in a field link test, the condition that equipment at each site is the same as corresponding position equipment in laboratory fiber coiling simulation is guaranteed, and local-end equipment, remote-end 1 equipment, remote-end 2 equipment, 8230, (remote-end m equipment, remote-end 8230, (remote-end n equipment) are connected in series in sequence through a field link.
The invention has the further improvement that based on laboratory optical fiber test results and field optical fiber test results, actual measurement Sagnac time deviation values of all the sites are obtained; in the process of acquiring the theoretical Sagnac time deviation value of each site based on the Sagnac effect time deviation correction model,
for site n, the actual Sagnac professorTime deviation is 1/2 (T) n ’-T n ) (ii) a Wherein, T n The method comprises the steps of transmitting a time deviation central value of remote end n equipment and local end equipment through remote end 1 equipment, \8230, and a time deviation central value of remote end n equipment and local end equipment after the remote end n-1 equipment is transmitted during laboratory fiber coiling simulation; t is n The method comprises the steps that a central value of time deviation between remote end n equipment and local end equipment is transmitted by remote end 1 equipment, \8230 \ remote end n-1 equipment during field optical fiber testing;
for site n, the theoretical Sagnac time service deviation is T 0n And the method is obtained by calculation according to the on-site optical fiber link trend, the longitude and the latitude of the station n and the model to be verified.
Compared with the prior art, the invention has the following beneficial effects:
the accuracy of the theoretical model cannot be verified because the earth rotation causes time transmission of the optical fiber to have time service deviation, but the measurement mode of the time service deviation does not exist. The method provided by the invention can verify the accuracy of the Sagnac effect time deviation correction theoretical model in the long-distance optical fiber time transmission link; further specifically, time service deviation introduced by sagnac effect caused by earth rotation is determined by longitude and latitude of the position of the optical fiber link, and as long as the position information of the optical fiber link and the position where the optical fiber time service equipment is placed is determined, the deviation value is fixed and can be compensated with high precision; according to the invention, the accuracy and perfection degree of the Sagnac effect time deviation correction model in long-distance optical fiber time transmission can be verified according to the comparison between the Sagnac time deviation theoretical value and the measured value of each station, so that the model algorithm can be continuously optimized, the model can be perfected, and the engineering adaptability of the theoretical model in practical application can be improved.
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 flowchart of a method for verifying feasibility engineering of a Sagnac effect time deviation correction model according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a laboratory fiber testing protocol provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of a field optical fiber testing scheme provided by an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, a feasibility engineering verification method of a Sagnac effect time deviation correction model according to an embodiment of the present invention is used for feasibility engineering verification of a Sagnac effect time deviation correction model transmitted over a long-distance optical fiber time, and includes the following steps:
all equipment and optical fiber links in the optical fiber time transmission system are placed at the same place, and equipment fixed time delay is calibrated for all the equipment;
respectively acquiring a laboratory optical fiber test result and a field optical fiber test result based on the calibrated equipment;
acquiring actual measurement Sagnac time deviation values of all stations based on laboratory optical fiber test results and field optical fiber test results; acquiring theoretical Sagnac time deviation values of all the sites based on a Sagnac effect time deviation correction model;
and the verification of the Sagnac effect time deviation correction model is realized by comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site.
According to the method provided by the embodiment of the invention, the accuracy and perfection degree of the Sagnac effect time deviation correction model in long-distance optical fiber time transmission can be verified according to the comparison between the Sagnac time deviation theoretical value and the measured value of each station, so that the model algorithm can be assisted and optimized, the model can be perfected, and the engineering adaptability of the theoretical model in practical application can be improved.
Referring to fig. 1 to fig. 3, an embodiment of the present invention provides a feasibility engineering verification method for a long-distance optical fiber time transmission Sagnac effect time deviation correction model according to a theoretical model for analyzing an influence of the Sagnac effect on the optical fiber time transmission precision, which is implemented by the following steps:
in Table I, L 1 Is the length, T, of the disc fiber 1 1 The time signal sent for the local end is transmitted by the remote end 1 equipment, and the local end equipment outputs the time deviation central value of the time signal after receiving the time signal and the time frequency source; l is a radical of an alcohol 2 Is the length sum of the coiled fibers 1 and 2, T 2 The time signal sent for the local end is transmitted by the remote end 1 and 2 equipment of the remote end, and the local end equipment outputs the time deviation central value of the time signal with the time frequency source after receiving the time signal; 823060, 8230; l is n Is coiled fiber 1, coiled fiber 2, \8230;, coiled fiber n length sum, T n The time signal sent out by the local end is transmitted by the remote end 1 device \8230 \, the remote end n device, the local end device receives the time signal and outputs the time deviation central value of the time signal with the time frequency source; where n is the number of devices.
And 3, ensuring that the equipment of each station is the same as the corresponding position equipment during laboratory test in the actual link test, connecting according to the on-site optical fiber test scheme of the figure 3, and filling a table II according to the test condition for recording.
In Table II, L 1 ' is the length of the field link 1, T 1 The time signal sent by the local end is transmitted by the remote end 1 equipment, and the local end equipment outputs the time deviation central value of the time signal with the time frequency source after receiving the time signal; l is a radical of an alcohol 2 ' is the sum of the lengths of the field link 1 and the field link 2, T 2 The time signal sent by the local end is transmitted by the remote end 1 equipment and the remote end 2 equipment, and the local end equipment outputs the time deviation central value of the time signal with the time frequency source after receiving the time signal; 823060, 8230; l is n ' field link 1, \ 8230 \ 8230 `, field link n length and, T n ' time signals sent by the local end pass through device 8230of remote end 1, 8230, and the time signals are transmitted by device n of the remote endThen, the local end equipment outputs the time deviation central value of the time signal after receiving the time signal and the time frequency source;
and 4, calculating theoretical Sagnac time deviation values and actual Sagnac time deviation values of all the stations according to the actual optical fiber link trends and the longitude and latitude of all the stations and theoretical models, wherein the theoretical Sagnac time deviation values and the actual Sagnac time deviation values of all the stations are shown in a table III.
In the embodiment of the invention, the time service deviation introduced by the Sagnac effect caused by the earth rotation is determined by the longitude and latitude position information, each device can transmit the longitude and latitude data information back to the local end through the optical fiber link according to the measurement of the positioning module at each site, and the operation control unit of the local end device calculates the theoretical Sagnac time service deviation of each site. As the optical signals are transmitted back and forth in the optical fiber link, the measured Sagnac time service deviation transmitted to each remote end station in one way is 1/2 (T) i ’-T i ) Wherein i is more than or equal to 1 and less than or equal to n. And sigma is total uncertainty deviation introduced by other error quantities, and each time delay quantity influencing the optical fiber time transmission accuracy is subjected to verification according to existing research results and field links of optical fiber time transmission of each large research institution.
The invention is finished as follows: sigma time delay temperature drift u of each equipment DT Time difference measurement error u TIM Laser wavelength error u Δ λ Optical fiber dispersion coefficient measurement error u in link Derr Dispersion coefficient temperature drift error u delta of optical fiber D The summation is formed, and the expression is,
in the formula u DTj J is greater than or equal to 1 and less than or equal to i and is a positive integer, u is the delay temperature drift of each remote end device DT0 Namely the time delay temperature drift of the local end equipment.
According to the analysis of the existing kilometre field optical fiber link time transmission test condition, the uncertain deviation of the sigma is in the magnitude of tens of ps, and the kilometre optical fiber link can introduce errors in the magnitude of nanoseconds, so that the method can effectively verify the theoretical model. In summary, the optical fiber time transmission time signal in the embodiment of the present invention is a 1PPS signal, and the reference frequency signal is a 10MHz signal; according to the invention, the accuracy and perfection degree of the Sagnac effect time deviation correction model in long-distance optical fiber time transmission can be verified according to the comparison between the Sagnac time deviation theoretical value and the measured value of each station, so that the model algorithm can be continuously optimized, the model can be perfected, and the engineering adaptability of the theoretical model in practical application can be improved.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details of non-careless mistakes in the embodiment of the apparatus, please refer to the embodiment of the method of the present invention.
In another embodiment of the present invention, a system for verifying feasibility engineering of a Sagnac effect time offset correction model is provided, which includes:
the calibration module is used for carrying out fixed time delay calibration on each device in the optical fiber time transmission system at a preset same place to obtain calibrated devices;
the test result acquisition module is used for respectively acquiring a laboratory optical fiber test result and a field optical fiber test result based on the calibrated equipment;
the Sagnac time deviation value acquisition module is used for acquiring the actual measurement Sagnac time deviation value of each station based on the laboratory optical fiber test result and the field optical fiber test result; acquiring theoretical Sagnac time deviation values of all the sites based on a Sagnac effect time deviation correction model;
and the verification module is used for comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site to realize the verification of the Sagnac effect time deviation correction model.
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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A feasibility engineering verification method of a Sagnac effect time deviation correction model is characterized by comprising the following steps:
carrying out fixed time delay calibration on each device in the optical fiber time transmission system at the same preset place to obtain calibrated devices;
respectively acquiring a laboratory optical fiber test result and a field optical fiber test result based on the calibrated equipment;
acquiring actual measurement Sagnac time deviation values of all stations based on laboratory optical fiber test results and field optical fiber test results; acquiring theoretical Sagnac time deviation values of all the sites based on a Sagnac effect time deviation correction model;
and comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site to realize the verification of the Sagnac effect time deviation correction model.
2. The method for verifying feasibility engineering of a Sagnac effect time offset correction model according to claim 1, wherein the step of performing fixed time delay calibration on each device in the optical fiber time transfer system at a preset same location to obtain the calibrated device specifically comprises:
and carrying out fixed time delay calibration on each device in the optical fiber time transmission system at a preset same place, and adjusting the time deviation central value of each remote end device and the local end device within a preset interval close to a 0 value to obtain the calibrated device.
3. The method for validating feasibility engineering of a Sagnac effect time deviation correction model according to claim 1, wherein the calibration-based device is used for respectively obtaining laboratory fiber test results and field fiber test results,
when laboratory optical fiber test results are obtained, simulating a field optical fiber link by adopting laboratory fiber coiling according to the actual test link condition; wherein, local end equipment, remote end 1 equipment, remote end 2 equipment, \8230;, remote end m equipment, \8230;, remote end n equipment are connected in series in sequence through coiled fiber, the lengths of the optical fiber coils among the devices are the same as the lengths of the optical fiber links among the devices in the solid optical fiber link;
when a field optical fiber test result is obtained, in a field link test, the condition that equipment at each site is the same as corresponding position equipment in laboratory fiber coiling simulation is guaranteed, and local-end equipment, remote-end 1 equipment, remote-end 2 equipment, 8230, (remote-end m equipment, remote-end 8230, (remote-end n equipment) are connected in series in sequence through a field link.
4. The feasibility engineering verification method of the Sagnac effect time deviation correction model according to claim 1, characterized in that the Sagnac time deviation value actually measured at each station is obtained based on laboratory optical fiber test results and field optical fiber test results; in the process of acquiring the theoretical Sagnac time deviation value of each site based on the Sagnac effect time deviation correction model,
for site n, the measured Sagnac time service deviation is 1/2 (T) n ’-T n ) (ii) a Wherein, T n The method comprises the steps of transmitting a time deviation central value of remote end n equipment and local end equipment through remote end 1 equipment, \8230, and a time deviation central value of remote end n equipment and local end equipment after the remote end n-1 equipment is transmitted during laboratory fiber coiling simulation; t is a unit of n The method comprises the steps that a central value of time deviation between remote end n equipment and local end equipment is transmitted by remote end 1 equipment, \8230 \ remote end n-1 equipment during field optical fiber testing;
for site n, the theoretical Sagnac time service deviation is T 0n The verification method is obtained by calculation according to the on-site optical fiber link trend, the station n longitude and latitude and the model to be verified.
5. A feasibility engineering verification system of a Sagnac effect time deviation correction model is characterized by comprising the following steps:
the calibration module is used for carrying out fixed time delay calibration on each device in the optical fiber time transmission system at the same preset place to obtain calibrated devices;
the test result acquisition module is used for respectively acquiring a laboratory optical fiber test result and a field optical fiber test result based on the calibrated equipment;
the Sagnac time deviation value acquisition module is used for acquiring the actual measurement Sagnac time deviation value of each station based on the laboratory optical fiber test result and the field optical fiber test result; acquiring theoretical Sagnac time deviation values of all the sites based on a Sagnac effect time deviation correction model;
and the verification module is used for comparing the actually measured Sagnac time deviation value with the theoretical Sagnac time deviation value in the same site, so as to realize the verification of the Sagnac effect time deviation correction model.
6. The system for verifying feasibility engineering of a Sagnac effect time offset correction model according to claim 5, wherein the calibrating of the fixed time delay of each device in the optical fiber time transfer system at the same predetermined location, and the obtaining of the calibrated device specifically comprises:
and carrying out fixed time delay calibration on each device in the optical fiber time transmission system at the same preset place, and adjusting the time deviation central value of each remote end device and the local end device within a preset interval close to a 0 value to obtain calibrated devices.
7. The system of claim 5, wherein during the process of obtaining laboratory fiber test results and field fiber test results respectively based on the calibrated device,
when laboratory optical fiber test results are obtained, simulating a field optical fiber link by adopting laboratory fiber coiling according to the actual test link condition; the local end device, the remote end 1 device, the remote end 2 device, the remote end 8230, the remote end m device, the remote end 8230, the remote end n device are sequentially connected in series through the coiled fibers, and the lengths of the coiled fibers among the devices are the same as the lengths of the optical fiber links among the devices in a field optical fiber link;
when a field optical fiber test result is obtained, in a field link test, the condition that equipment at each site is the same as corresponding position equipment in laboratory fiber coiling simulation is guaranteed, and local-end equipment, remote-end 1 equipment, remote-end 2 equipment, 8230, (remote-end m equipment, remote-end 8230, (remote-end n equipment) are connected in series in sequence through a field link.
8. The system for verifying feasibility engineering of the Sagnac effect time deviation correction model according to claim 5, wherein the Sagnac time deviation value actually measured at each site is obtained based on laboratory optical fiber test results and field optical fiber test results; in the process of acquiring the theoretical Sagnac time deviation value of each site based on the Sagnac effect time deviation correction model,
for site n, the measured Sagnac time service deviation is 1/2 (T) n ’-T n ) (ii) a Wherein, T n The method comprises the steps that a central value of time deviation between remote end n equipment and local end equipment is transmitted by remote end 1 equipment, \8230 \ by remote end n-1 equipment when laboratory fiber coiling simulation is carried out; t is n The method comprises the steps that a central value of time deviation between remote end n equipment and local end equipment is transmitted by remote end 1 equipment, \8230 \ remote end n-1 equipment during field optical fiber testing;
for site n, the theoretical Sagnac time service deviation is T 0n The verification method is obtained by calculation according to the on-site optical fiber link trend, the station n longitude and latitude and the model to be verified.
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