CN103576542A - Ground Beidou high-precision time service system based on ground optical fiber networks - Google Patents
Ground Beidou high-precision time service system based on ground optical fiber networks Download PDFInfo
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Abstract
The invention provides a ground Beidou high-precision time service system based on ground optical fiber networks and aims to solve the problems that in the prior art, a high-precision time service system based on a satellite is prone to being disturbed and being affected by weather or climates, and signals can be adopted only in open-air places. The ground Beidou high-precision time service system comprises a zero level optical fiber network, a first level optical fiber network, a second level optical fiber network and a third level optical fiber network in a setting mode, a level calibration mechanism is adopted for maintaining clock synchronization of the optical fiber networks at all the levels, and a single-fiber bi-direction calibration method is adopted for achieving the clock synchronization of the optical fiber networks at all the levels. The ground Beidou high-precision time service system based on the ground optical fiber networks has the advantages that a ground-based time service system can be formed, the ground-based time service system and a space-based time service system (such as a GPS/a GLONASS/a Beidou satellite navigation system) serve as standby mutually and are supported mutually, and the ground Beidou high-precision time service system has the advantages of being low in cost, high in disturbance resistance destroy resistance and the like and provides the most basic time service for China military and civilian communication, navigation and positioning systems.
Description
Technical field
The present invention relates to ground time service and technical field of optical fiber communication, specially refer to a kind of ground Big Dipper high precision time dissemination system based on ground fiber optic network.
Background technology
Along with scientific and technical development, various device and technology all need to be take high-precision time and frequency as basis.For example, the realization of the foundation of intelligent traffic system and the digitizing earth all need to be take high-precision time and frequency as basis; The various monitorings of modern war and weapon transmitting etc. also need to be take high-precision time and frequency as basis.At present, what be most widely used is the time dissemination system based on satellite navigation system, because being take satellite navigation system as basis, conventionally also referred to as space-based time dissemination system.As the dipper system of the GALILEO in the GPS of the U.S., Muscovite GLONASS, Europe and China.Space-based time dissemination system depends on satellite transmission signal, adopts wireless network transmitting signal, is easily subject to external interference and can not uses (as artificial Electromagnetic Interference), is also easily subject to weather or climatic influences.And place adopts signal in the open, if satellite-signal is just blocked and can not use by barrier.Obviously, the satellite-based high precision time dissemination system of prior art exists easily problems such as being disturbed, being subject to weather or climatic influences and the signal of place employing in the open.
Summary of the invention
For solve that the satellite-based high precision time dissemination system of prior art exists be easily disturbed, be subject to weather or climatic influences and in the open place adopt the problems such as signal, the present invention proposes a kind of ground Big Dipper high precision time dissemination system based on ground fiber optic network.The ground Big Dipper high precision time dissemination system that the present invention is based on ground fiber optic network comprises sets zero level, one-level, secondary and three grades totally four level optical networkings, adopt rank alignment mechanism to keep the clock synchronous of each level optical networking, adopt single fiber bi-directional calibration steps to realize the clock synchronous of each level optical networking, wherein
Zero order light fibre web is shape grid node net in many ways, at least comprises two above grid nodes, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; Described grid node is system time service center, wherein, it is within 6,000,000 years, to differ from the cesium-beam atomic clock of 1 second that at least one time service center is provided with precision, it is to differ from the high-grade cesium-beam atomic clock of 1 second in 1,500 ten thousand that at least one time service center is provided with precision, and every pulse per second (PPS) 1PPS and UTC compare relative time drift accumulation≤0.5ns/ days; Zero order light fibre web is usingd average moment of each grid node as time service benchmark;
One-level optical networking is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And one-level optical networking has at least three routes to be connected with zero order light fibre web, wherein, one is normal channel primary route, and other two is alternate routing; The grid node of one-level optical networking is provided with cesium-beam atomic clock or hydrogen atomic clock, and realize and synchronizeing with the clock of zero order light fibre web, its time frequency reference should reach: relative frequency deviation≤± 5E-15/ days～± 1E-14/ days, relative phase deviation≤± 1ns/ days, relative time spacing bias≤0.5ns～1ns;
Secondary light fibre web is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And secondary light fibre web has at least three routes to be connected with one-level optical networking, wherein, one is normal channel primary route, and other two is alternate routing; The grid node of the key optical networking of secondary is provided with rubidium atomic clock, and realizes and synchronizeing with the clock of one-level optical networking;
3-stage optical fiber net is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And 3-stage optical fiber net has at least three routes to be connected with secondary light fibre web, wherein, one is normal open route, and other two is alternate routing; The grid node of three grades of key optical networkings is provided with rubidium atomic clock or controlled xtal clock X01 or X02 or X03, and realizes and synchronizeing with the clock of secondary light fibre web; Described controlled xtal clock X01, X02 and X03 adopt respectively digital compensation crystal oscillator DCXO, voltage type crystal oscillator VCXO-1 and voltage type crystal oscillator VCXO-2;
Described employing rank alignment mechanism keeps the clock synchronous of each level optical networking to refer to that whole system is according to the order of high-grade cesium-beam atomic clock → cesium-beam atomic clock or hydrogen atomic clock → rubidium atomic clock → DCXO → VCXO-1 → VCXO-2 continual automatic maintenance clock synchronous step by step, comprise: according to above-mentioned order, set respectively master-slave synchronisation relation, be that high-grade cesium-beam atomic clock and cesium-beam atomic clock or hydrogen atomic clock are master-slave synchronisation relation, cesium-beam atomic clock or hydrogen atomic clock and rubidium atomic clock are master-slave synchronisation relation, rubidium atomic clock and DCXO are master-slave synchronisation relation, by that analogy; From clock, all take major clock and keep synchronous as benchmark;
Described employing single fiber bi-directional calibration steps is realized the clock synchronous of each level optical networking, comprise, the single fiber super high precision time delivering method that all adopts between any two that is related to all nodes at two ends at connection master-slave synchronisation guarantees clock synchronous between the two, in main synchronous side, be provided with main synchronizer, from synchronous side, be provided with from synchronizer, master and slave synchronous side all adopts single fiber multiplexing equipment to realize connection between the two; After adopting optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure, compensated again; And using the clock of main synchronous side as time source; Wherein,
Main synchronizer: main tracking time source, and by temporal information modulating/demodulating to Snigle, complete that overall delay is measured, the two-way comparison of time signal;
From synchronizer: mainly realize the phase locked track technology of clock, realize the encoding and decoding of super high precision time synchronized and time signal;
Single fiber multiplexing equipment; Comprise time delay processing module and Snigle, wherein, time delay processing module is mainly used in eliminating the asymmetric difference that wavelength difference causes, and completes the dynamic compensation of propagation delay time; Snigle adopts wavelength-division multiplex technique, optical wavelength to transmission is changed, to opposite end, remake inverse transform, in same optical fiber, allow two optical wavelength pass through different optical channels transmission information separately simultaneously, it is taken their own roads, thereby realize light signal transmission in opposite directions on same optical fiber;
And, by the jittering noise that carries out in the short time introducing in repeatedly duplicate measurements and compensation filtering optical fiber transmittance process; The optical-fiber time-delay test of the discontinuity by the cycle is removed due to temperature and the aging time-delay deviation producing, peels off and cuts apart the negative effect that optical-fiber time-delay drift is accumulated.
Further, the present invention is based on the ground Big Dipper high precision time dissemination system of ground fiber optic network, compensated again after adopting optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure, comprise the following steps:
(1) time synchronized of main synchronizer is arranged to the clock of following the tracks of this level optical networking, its tracking accuracy is ± 1ns; By the 1PPS header signal modulating/demodulating with time signal to Snigle;
(2) from synchronizer, carry out Frequency Synchronization, its tracking accuracy is≤5 * 10E-14;
(3) measure overall delay value, and calculate principal and subordinate's time delay T by following formula
aB, main synchronizer shifts to an earlier date T by phase shift network by temporal information
aB, thus, lock in time can reach ± 5ns of precision;
In formula, T
aBbe that main synchronous side is to the time delay from synchronous side, T
bAfor the time delay from synchronous side to main synchronous side, T
aSSbe transmission delay in main synchronous side equipment,
be that main synchronous side is to the Optical Fiber Transmission time delay from synchronous side, T
bSRfor receive time delay in synchronous side equipment, T
bSSfor transmission delay in synchronous side equipment,
for the Optical Fiber Transmission time delay from synchronous side to main synchronous side, T
aSRit is receive time delay in main synchronous side equipment; Described main synchronous side comprises main synchronizer, time delay processing module and Snigle, describedly from synchronous side, comprises from synchronizer, time delay processing module and Snigle;
(4) from synchronous side, carry out for a long time Frequency Synchronization and time synchronized, guarantee to obtain every pulse per second (PPS) 1PPS signal accurately, guarantee from synchronous side clock and main synchronous side clock synchronous.
Further, the present invention is based on the ground Big Dipper high precision time dissemination system of ground fiber optic network by the jittering noise that carries out in the short time introducing in repeatedly duplicate measurements and compensation filtering optical fiber transmittance process, comprise after the optical-fiber time-delay value that adopts between master and slave synchronizer and changing value thereof are precisely measured and being compensated again, and in 1 second, carry out more than 80 times measurement and compensation.
Further, the ground Big Dipper high precision time dissemination system that the present invention is based on ground fiber optic network is removed due to temperature and the aging time-delay deviation producing by the overall delay test of discontinuity, comprise after the optical-fiber time-delay value that adopts between master and slave synchronizer and changing value thereof are precisely measured and being compensated again, and be more than 500 seconds interval time, with this, peel off and cut apart the negative effect of optical-fiber time-delay drift accumulation.
The useful technique effect that the present invention is based on the ground Big Dipper high precision time dissemination system of ground fiber optic network is the ground time dissemination system that for example can form, with space-based time dissemination system (GPS/GLONASS/ Beidou satellite navigation system) standby, mutual support each other, and there is the strong and military-civil communication and navigation of survivability high ，Wei China of with low cost, antijamming capability and positioning system the most basic time service service is provided.
Accompanying drawing explanation
Accompanying drawing 1 is to the present invention is based on the ground Big Dipper high precision time dissemination system zero level net of ground fiber optic network and the structural representation of one-level net;
Accompanying drawing 2 is the master and slave synchronous schematic diagram of ground Big Dipper high precision time dissemination system that the present invention is based on ground fiber optic network.
Below in conjunction with the drawings and specific embodiments, to the present invention is based on the ground Big Dipper high precision time dissemination system of ground fiber optic network, be further described.
Embodiment
Accompanying drawing 1 is to the present invention is based on the ground Big Dipper high precision time dissemination system zero level net of ground fiber optic network and the structural representation of one-level net, and in figure, L0-L6 is zero order light fibre web grid node, and F0-F6 is one-level optical networking grid node.As seen from the figure, the ground Big Dipper high precision time dissemination system that the present invention is based on ground fiber optic network comprises sets zero level, one-level, secondary and three grades totally four level optical networkings, adopt rank alignment mechanism to keep the clock synchronous of each level optical networking, adopt single fiber bi-directional calibration steps to realize the clock synchronous of each level optical networking, wherein
Zero order light fibre web is shape grid node net in many ways, at least comprises two above grid nodes, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; Described grid node is system time service center, wherein, it is within 6,000,000 years, to differ from the cesium-beam atomic clock of 1 second that at least one time service center is provided with precision, it is to differ from the high-grade cesium-beam atomic clock of 1 second in 1,500 ten thousand that at least one time service center is provided with precision, and every pulse per second (PPS) 1PPS and UTC comparison time drift accumulation≤0.5ns/ days; Zero order light fibre web is usingd average moment of each grid node as time service benchmark;
One-level optical networking is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And one-level optical networking has at least three routes to be connected with zero order light fibre web, wherein, one is normal open route, and other two is alternate routing; The grid node of one-level optical networking is provided with cesium-beam atomic clock or hydrogen atomic clock, and realize and synchronizeing with the clock of zero order light fibre web, its time frequency reference should reach: relative frequency deviation≤± 5E-15/ days～± 1E-14/ days, relative phase deviation≤± 1ns/ days, relative time spacing bias≤0.5ns～1ns;
Secondary light fibre web is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And secondary light fibre web has at least three routes to be connected with one-level optical networking, wherein, one is normal open route, and other two is alternate routing; The grid node of the key optical networking of secondary is provided with rubidium atomic clock, and realizes and synchronizeing with the clock of one-level optical networking;
3-stage optical fiber net is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And 3-stage optical fiber net has at least three routes to be connected with secondary light fibre web, wherein, one is normal open route, and other two is alternate routing; The grid node of three grades of key optical networkings is provided with rubidium atomic clock or controlled xtal clock X01 or X02 or X03, and realizes and synchronizeing with the clock of secondary light fibre web; Described controlled xtal clock X01, X02 and X03 adopt respectively digital compensation crystal oscillator DCXO, voltage type crystal oscillator VCXO-1 and voltage type crystal oscillator VCXO-2;
Described employing rank alignment mechanism keeps the clock synchronous of each level optical networking to refer to that whole system is according to the order of high-grade cesium-beam atomic clock → cesium-beam atomic clock or hydrogen atomic clock → rubidium atomic clock → DCXO → VCXO-1 → VCXO-2 continual automatic maintenance clock synchronous step by step, comprise: according to above-mentioned order, set respectively master-slave synchronisation relation, be that high-grade cesium-beam atomic clock and cesium-beam atomic clock or hydrogen atomic clock are master-slave synchronisation relation, cesium-beam atomic clock or hydrogen atomic clock and rubidium atomic clock are master-slave synchronisation relation, rubidium atomic clock and DCXO are master-slave synchronisation relation, by that analogy; From clock, all take major clock and keep synchronous as benchmark;
Described employing single fiber bi-directional calibration steps is realized the clock synchronous of each level optical networking, comprise, the single fiber super high precision time delivering method that all adopts between any two that is related to all nodes at two ends at connection master-slave synchronisation guarantees clock synchronous between the two, in main synchronous side, be provided with main synchronizer, from synchronous side, be provided with from synchronizer, master and slave synchronous side all adopts single fiber multiplexing equipment to realize connection between the two, is compensated after adopting optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure again; And using the clock of main synchronous side as time source, wherein,
Main synchronizer: main tracking time source, and by temporal information modulating/demodulating to Snigle, complete that overall delay is measured, the two-way comparison of time signal;
From synchronizer: mainly realize the phase locked track technology of clock, realize the encoding and decoding of super high precision time synchronized and time signal;
Single fiber multiplexing equipment: comprise time delay processing module and Snigle, wherein, time delay processing module is mainly used in eliminating the asymmetric difference that wavelength difference causes, and completes the dynamic compensation of propagation delay time; Snigle adopts wavelength-division multiplex technique, optical wavelength to transmission is changed, to opposite end, remake inverse transform, in same optical fiber, allow two optical wavelength pass through different optical channels transmission information separately simultaneously, it is taken their own roads, thereby realize light signal transmission in opposite directions on same optical fiber;
And, by the jittering noise that carries out in the short time introducing in repeatedly duplicate measurements and compensation filtering optical fiber transmittance process; Overall delay test by discontinuity is removed due to temperature and the aging time-delay deviation producing, and peels off and cut apart the negative effect of optical-fiber time-delay drift accumulation.
Accompanying drawing 2 is the ground Big Dipper high precision time dissemination system master-slave synchronisation schematic diagram that the present invention is based on ground fiber optic network, and in figure, 1 is main synchronizer, and 2 is from synchronizer, and 3 is single fiber multiplexing equipment, and 4 is main synchronous side clock, and 5 is from synchronous side clock.As seen from the figure, adopt single fiber bi-directional calibration steps to realize the clock synchronous of each level optical networking, comprise, the single fiber super high precision time delivering method that all adopts between any two that is related to all nodes at two ends at connection master-slave synchronisation guarantees clock synchronous between the two, in main synchronous side, be provided with main synchronizer, from synchronous side, be provided with from synchronizer, master and slave synchronous side all adopts single fiber multiplexing equipment to realize connection between the two, is compensated after adopting optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure again; And using the clock of main synchronous side as time source, wherein,
Main synchronizer: main tracking time source, and by temporal information modulating/demodulating to Snigle, complete that overall delay is measured, the two-way comparison of time signal;
From synchronizer: mainly realize the phase locked track technology of clock, realize the encoding and decoding of super high precision time synchronized and time signal;
Single fiber multiplexing equipment: comprise time delay processing module and Snigle, wherein, time delay processing module is mainly used in eliminating the asymmetric difference that wavelength difference causes, and completes the dynamic compensation of propagation delay time; Single fiber multiplexing equipment adopts wavelength-division multiplex technique, optical wavelength to transmission is changed, and to opposite end, remakes inverse transform, allows two optical wavelength pass through different optical channels transmission information separately in same optical fiber simultaneously, it is taken their own roads, thereby realize light signal transmission in opposite directions on same optical fiber;
Concrete steps comprise:
(1) time synchronized of main synchronizer is arranged to the clock of following the tracks of this level optical networking, its tracking accuracy is ± 1ns; By the 1PPS header signal modulating/demodulating with time signal to Snigle;
(2) from synchronizer, carry out Frequency Synchronization, its tracking accuracy is ± 5E-14;
(3) measure overall delay value, and calculate principal and subordinate's time delay T by following formula
aB, main synchronizer shifts to an earlier date T by phase shift network by temporal information
aB, thus, lock in time can reach ± 5ns of precision;
In formula, T
aBbe that main synchronous side is to the time delay from synchronous side, T
bAfor the time delay from synchronous side to main synchronous side, T
aSSbe transmission delay in main synchronous side equipment,
be that main synchronous side is to the Optical Fiber Transmission time delay from synchronous side, T
bSRfor receive time delay in synchronous side equipment, T
bSSfor transmission delay in synchronous side equipment,
for the Optical Fiber Transmission time delay from synchronous side to main synchronous side, T
aSRit is receive time delay in main synchronous side equipment; Described main synchronous side comprises main synchronizer, time delay processing module and Snigle, describedly from synchronous side, comprises from synchronizer, time delay processing module and Snigle;
(4) from synchronous side, carry out for a long time Frequency Synchronization and time synchronized, guarantee to obtain every pulse per second (PPS) 1PPS signal accurately, guarantee from synchronous side clock and main synchronous side clock synchronous.
For the jittering noise of introducing in filtering optical fiber transmittance process, the ground Big Dipper high precision time dissemination system that the present invention is based on ground fiber optic network is by carrying out repeatedly duplicate measurements in the short time and filtering is carried out in compensation, comprise after the optical-fiber time-delay value that adopts between master and slave synchronizer and changing value thereof are precisely measured and being compensated again, and in 1 second, carry out more than 80 times measurement and compensation.
For removing due to temperature and the aging time-delay deviation producing, the ground Big Dipper high precision time dissemination system that the present invention is based on ground fiber optic network is removed by the overall delay test of discontinuity, comprise after the optical-fiber time-delay value that adopts between master and slave synchronizer and changing value thereof are precisely measured and being compensated again, and be more than 500 seconds interval time.
The useful technique effect that the present invention is based on the ground Big Dipper high precision time dissemination system of ground fiber optic network is the ground time dissemination system that for example can form, with space-based time dissemination system (GPS/GLONASS/ Beidou satellite navigation system) standby, mutual support each other, and there is the strong and military-civil communication and navigation of survivability high ，Wei China of with low cost, antijamming capability and positioning system the most basic time service service is provided.
Claims (4)
1. the ground Big Dipper high precision time dissemination system based on ground fiber optic network, it is characterized in that: this system comprises sets zero level, one-level, secondary and three grades totally four level optical networkings, adopt rank alignment mechanism to keep the clock synchronous of each level optical networking, adopt single fiber bi-directional calibration steps to realize the clock synchronous of each level optical networking, wherein
Zero order light fibre web is shape grid node net in many ways, at least comprises two above grid nodes, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; Described grid node is system time service center, wherein, it is within 6,000,000 years, to differ from the cesium-beam atomic clock of 1 second that at least one time service center is provided with precision, it is to differ from the high-grade cesium-beam atomic clock of 1 second in 1,500 ten thousand that at least one time service center is provided with precision, and every pulse per second (PPS) 1PPS and UTC compare relative time drift accumulation≤0.5ns/ days; Zero order light fibre web is usingd average moment of each grid node as time service benchmark;
One-level optical networking is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And one-level optical networking has at least three routes to be connected with zero order light fibre web, wherein, one is normal channel primary route, and other two is alternate routing; The grid node of one-level optical networking is provided with cesium-beam atomic clock or hydrogen atomic clock, and realize and synchronizeing with the clock of zero order light fibre web, its time frequency reference should reach: relative frequency deviation≤± 5E-15/ days～± 1E-14/ days, relative phase deviation≤± 1ns/ days, relative time spacing bias≤0.5ns～1ns;
Secondary light fibre web is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And secondary light fibre web has at least three routes to be connected with one-level optical networking, wherein, one is normal channel primary route, and other two is alternate routing; The grid node of the key optical networking of secondary is provided with rubidium atomic clock, and realizes and synchronizeing with the clock of one-level optical networking;
3-stage optical fiber net is ring-type, tree-shaped or honeycomb grid node net, is at least provided with between two three routes between grid node, and wherein, one is normal open route, and other two is alternate routing; And 3-stage optical fiber net has at least three routes to be connected with secondary light fibre web, wherein, one is normal open route, and other two is alternate routing; The grid node of three grades of key optical networkings is provided with rubidium atomic clock or controlled xtal clock X01 or X02 or X03, and realizes and synchronizeing with the clock of secondary light fibre web; Described controlled xtal clock X01, X02 and X03 adopt respectively digital compensation crystal oscillator DCXO, voltage type crystal oscillator VCXO-1 and voltage type crystal oscillator VCXO-2;
Described employing rank alignment mechanism keeps the clock synchronous of each level optical networking to refer to that whole system is according to the order of high-grade cesium-beam atomic clock → cesium-beam atomic clock or hydrogen atomic clock → rubidium atomic clock → DCXO → VCXO-1 → VCXO-2 continual automatic maintenance clock synchronous step by step, comprise: according to above-mentioned order, set respectively master-slave synchronisation relation, be that high-grade cesium-beam atomic clock and cesium-beam atomic clock or hydrogen atomic clock are master-slave synchronisation relation, cesium-beam atomic clock or hydrogen atomic clock and rubidium atomic clock are master-slave synchronisation relation, rubidium atomic clock and DCXO are master-slave synchronisation relation, by that analogy; From clock, all take major clock and keep synchronous as benchmark;
Described employing single fiber bi-directional calibration steps is realized the clock synchronous of each level optical networking, comprise, the single fiber super high precision time delivering method that all adopts between any two that is related to all nodes at two ends at connection master-slave synchronisation guarantees clock synchronous between the two, in main synchronous side, be provided with main synchronizer, from synchronous side, be provided with from synchronizer, master and slave synchronous side all adopts single fiber multiplexing equipment to realize connection between the two; After adopting optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure, compensated again; And using the clock of main synchronous side as time source; Wherein,
Main synchronizer: main tracking time source, and by temporal information modulating/demodulating to Snigle, complete that overall delay is measured, the two-way comparison of time signal;
From synchronizer: mainly realize the phase locked track technology of clock, realize the encoding and decoding of super high precision time synchronized and time signal;
Single fiber multiplexing equipment; Comprise time delay processing module and Snigle, wherein, time delay processing module is mainly used in eliminating the asymmetric difference that wavelength difference causes, and completes the dynamic compensation of propagation delay time; Snigle adopts wavelength-division multiplex technique, optical wavelength to transmission is changed, to opposite end, remake inverse transform, in same optical fiber, allow two optical wavelength pass through different optical channels transmission information separately simultaneously, it is taken their own roads, thereby realize light signal transmission in opposite directions on same optical fiber;
And, by the jittering noise that carries out in the short time introducing in repeatedly duplicate measurements and compensation filtering optical fiber transmittance process; The optical-fiber time-delay test of the discontinuity by the cycle is removed due to temperature and the aging time-delay deviation producing.
2. the ground Big Dipper high precision time dissemination system based on ground fiber optic network according to claim 1, is characterized in that: after adopting optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure, compensated again, comprise the following steps:
(1) time synchronized of main synchronizer is arranged to the clock of following the tracks of this level optical networking, its tracking accuracy is ± 1ns; By the 1PPS header signal modulating/demodulating with time signal to Snigle;
(2) from synchronizer, carry out Frequency Synchronization, its tracking accuracy is≤5 * 10E-14;
(3) measure overall delay value, and calculate principal and subordinate's time delay T by following formula
aB, main synchronizer shifts to an earlier date T by phase shift network by temporal information
aB, thus, lock in time can reach ± 5ns of precision;
In formula, T
aBbe that main synchronous side is to the time delay from synchronous side, T
bAfor the time delay from synchronous side to main synchronous side, T
aSSbe transmission delay in main synchronous side equipment,
be that main synchronous side is to the Optical Fiber Transmission time delay from synchronous side, T
bSRfor receive time delay in synchronous side equipment, T
bSSfor transmission delay in synchronous side equipment,
for the Optical Fiber Transmission time delay from synchronous side to main synchronous side, T
aSRit is receive time delay in main synchronous side equipment; Described main synchronous side comprises main synchronizer, single fiber multiplexing equipment (comprising time delay processing module and Snigle), describedly from synchronous side, comprises from synchronizer, single fiber multiplexing equipment (comprising time delay processing module and Snigle);
(4) from synchronous side, carry out for a long time Frequency Synchronization and time synchronized, guarantee to obtain every pulse per second (PPS) 1PPS signal accurately, guarantee from synchronous side clock and main synchronous side clock synchronous.
3. the ground Big Dipper high precision time dissemination system based on ground fiber optic network according to claim 1, it is characterized in that: by the jittering noise that carries out in the short time introducing in repeatedly duplicate measurements and compensation filtering optical fiber transmittance process, comprise after the optical-fiber time-delay value that adopts between master and slave synchronizer and changing value thereof are precisely measured and being compensated again, and in 1 second, carry out more than 80 times measurement and compensation.
4. the ground Big Dipper high precision time dissemination system based on ground fiber optic network according to claim 1, it is characterized in that: the overall delay test by discontinuity is removed due to temperature and the aging time-delay deviation producing, comprise after the optical-fiber time-delay value that adopts between master and slave synchronizer and changing value thereof are precisely measured and being compensated again, and be more than 500 seconds interval time, with this, peel off and cut apart the negative effect of optical-fiber time-delay drift accumulation.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916204A (en) * | 2014-03-06 | 2014-07-09 | 成都泰富通信有限公司 | Cloud synchronization method of high-precision timing system of optical network |
| CN104022840A (en) * | 2014-05-14 | 2014-09-03 | 烽火通信科技股份有限公司 | Device and method for integrating frequency and time synchronous interfaces in optical transmission network |
| CN104486022A (en) * | 2014-12-12 | 2015-04-01 | 北京中经赛博科技有限公司 | Synchronization scheme for base station OTN (Optical Transport Network) equipment |
| CN106034003A (en) * | 2015-03-10 | 2016-10-19 | 四川泰富地面北斗科技股份有限公司 | Method for transmitting ultra-precise time frequency signal based on double fibers |
| CN106301749A (en) * | 2016-07-21 | 2017-01-04 | 芜湖航飞科技股份有限公司 | A kind of time synchronization device for electrical power system based on dipper system |
| CN109412692A (en) * | 2018-10-30 | 2019-03-01 | 中国科学院国家授时中心 | A kind of distribution type fiber-optic time dissemination system and its sagnac effect compensation method |
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| CN112566237A (en) * | 2020-11-30 | 2021-03-26 | 中国科学院国家授时中心 | Time synchronization method based on multi-node networking |
| CN113075699A (en) * | 2021-03-23 | 2021-07-06 | 广东工业大学 | 5G gateway multi-mode composite high-precision time service method and system |
| CN114384790A (en) * | 2022-01-18 | 2022-04-22 | 中车长春轨道客车股份有限公司 | Time calibration method for motor train unit |
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| CN103916204A (en) * | 2014-03-06 | 2014-07-09 | 成都泰富通信有限公司 | Cloud synchronization method of high-precision timing system of optical network |
| CN103916204B (en) * | 2014-03-06 | 2019-01-15 | 成都泰富通信有限公司 | A kind of cloud synchronous method of fiber optic network high-precision time dissemination system |
| CN104022840A (en) * | 2014-05-14 | 2014-09-03 | 烽火通信科技股份有限公司 | Device and method for integrating frequency and time synchronous interfaces in optical transmission network |
| CN104022840B (en) * | 2014-05-14 | 2017-01-04 | 烽火通信科技股份有限公司 | Integrated frequency and the device and method of time synchronized interface in optical transport network |
| CN104486022A (en) * | 2014-12-12 | 2015-04-01 | 北京中经赛博科技有限公司 | Synchronization scheme for base station OTN (Optical Transport Network) equipment |
| CN106034003A (en) * | 2015-03-10 | 2016-10-19 | 四川泰富地面北斗科技股份有限公司 | Method for transmitting ultra-precise time frequency signal based on double fibers |
| CN106301749A (en) * | 2016-07-21 | 2017-01-04 | 芜湖航飞科技股份有限公司 | A kind of time synchronization device for electrical power system based on dipper system |
| CN110967967A (en) * | 2018-09-28 | 2020-04-07 | 三星电子株式会社 | Mobile advanced master clock, method for establishing advanced master clock and autonomous vehicle |
| CN110967967B (en) * | 2018-09-28 | 2021-12-07 | 三星电子株式会社 | Mobile advanced master clock, method for establishing advanced master clock and autonomous vehicle |
| CN109412692A (en) * | 2018-10-30 | 2019-03-01 | 中国科学院国家授时中心 | A kind of distribution type fiber-optic time dissemination system and its sagnac effect compensation method |
| CN112566237A (en) * | 2020-11-30 | 2021-03-26 | 中国科学院国家授时中心 | Time synchronization method based on multi-node networking |
| CN112566237B (en) * | 2020-11-30 | 2022-11-15 | 中国科学院国家授时中心 | Time synchronization method based on multi-node networking |
| CN113075699A (en) * | 2021-03-23 | 2021-07-06 | 广东工业大学 | 5G gateway multi-mode composite high-precision time service method and system |
| CN113075699B (en) * | 2021-03-23 | 2023-08-08 | 广东工业大学 | Multi-mode composite high-precision time service method and system for 5G gateway |
| CN114384790A (en) * | 2022-01-18 | 2022-04-22 | 中车长春轨道客车股份有限公司 | Time calibration method for motor train unit |
| CN114384790B (en) * | 2022-01-18 | 2023-08-18 | 中车长春轨道客车股份有限公司 | Time calibration method for motor train unit |
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