CN103576542B - The high precision time dissemination system of the ground Big Dipper is used for based on ground fiber optic network - Google Patents
The high precision time dissemination system of the ground Big Dipper is used for based on ground fiber optic network Download PDFInfo
- Publication number
- CN103576542B CN103576542B CN201310562284.9A CN201310562284A CN103576542B CN 103576542 B CN103576542 B CN 103576542B CN 201310562284 A CN201310562284 A CN 201310562284A CN 103576542 B CN103576542 B CN 103576542B
- Authority
- CN
- China
- Prior art keywords
- time
- clock
- synchronous
- delay
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
- Optical Communication System (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Easily be disturbed for what solve that the satellite-based high precision time dissemination system of prior art exists, be subject to weather or climatic influences and the problems such as signal can only be adopted in place in the open, the present invention proposes a kind of ground Big Dipper high precision time dissemination system based on ground fiber optic network, comprise setting zero level, one-level, secondary and three grades totally four level optical networkings, adopt level calibration 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.The Advantageous Effects that the present invention is based on the ground Big Dipper high precision time dissemination system of ground fiber optic network to form the ground time dissemination system with space-based time dissemination system (such as GPS/GLONASS/ Beidou satellite navigation system) for subsequent use, mutual support each other, and there is the strong and survivability high of with low cost, antijamming capability, for the military-civil communication and navigation of China and positioning system provide the most basic time service service.
Description
Technical field
The present invention relates to ground time service and technical field of optical fiber communication, be related specifically to a kind of based on the high precision time dissemination system of ground fiber optic network for the ground Big Dipper.
Background technology
Along with the development of science and technology, various equipment and technology all needed based on high-precision time and frequency.Such as, the foundation of intelligent traffic system and the realization of the digitizing earth all need based on high-precision time and frequency; The various monitoring of modern war and arm discharge etc. also needed based on high-precision time and frequency.At present, the time dissemination system be based on satellite navigation system be most widely used, owing to being based on satellite navigation system, usually also referred to as space-based time dissemination system.As the GPS of the U.S., Muscovite GLONASS, the GALILEO in Europe and the dipper system of China.Space-based time dissemination system depends on satellite transmission signal, namely adopts wireless network transmitting signal, is easily subject to external interference and can not uses (Electromagnetic Interference as artificial), also easily by weather or climatic influences.Further, signal can only be adopted in place in the open, just can not use if satellite-signal is blocked by barrier.Obviously, the satellite-based high precision time dissemination system of prior art also exists and is easily disturbed, is subject to weather or climatic influences and can only adopts the problems such as signal in place in the open.
Summary of the invention
Easily be disturbed for what solve that the satellite-based high precision time dissemination system of prior art exists, be subject to weather or climatic influences and can only adopt the problems such as signal in place in the open, the present invention proposes a kind of based on the high precision time dissemination system of ground fiber optic network for the ground Big Dipper.The present invention is based on ground fiber optic network and comprise zero level, one-level, secondary and three grades totally four level optical networkings for the high precision time dissemination system of the ground Big Dipper, level calibration mechanism is adopted to keep the clock synchronous of each level optical networking, single fiber bi-directional calibration steps is adopted to realize the clock synchronous of each level optical networking, wherein
Zero order light fibre web is polygonal gird node net, at least comprises the grid node of more than two, is at least provided with three routes between two 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 the cesium-beam atomic clock differing from 1 second in 6,000,000 years that at least one time service center is provided with precision, it is the high-grade cesium-beam atomic clock differing from 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 relative clock drift accumulate≤0.5ns/ days; Zero order light fibre web is using the 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 three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, one-level optical networking has at least three routes to be connected with zero order light fibre web, and 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 synchronous with the clock of zero order light fibre web, its Time and frequency standard should reach: relative frequency deviation≤± 5E-15/ days ~ ± 1E-14/ days, relative phase deviation≤± 1ns/ days, relative time-intervals deviation≤0.5ns ~ 1ns;
Secondary light fibre web is ring-type, tree-shaped or honeycomb grid node net, is at least provided with three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, secondary light fibre web has at least three routes to be connected with one-level optical networking, and wherein, one is normal channel primary route, and other two is alternate routing; The grid node of secondary light fibre web is provided with rubidium atomic clock, and realizes synchronous 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 three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, 3-stage optical fiber net has at least three routes to be connected with secondary light fibre web, and wherein, one is normal open route, and other two is alternate routing; The grid node of three grades of bone optical fiber nets is provided with rubidium atomic clock or controlled xtal clock X01 or X02 or X03, and realizes synchronous with the clock of secondary light fibre web; Described controlled xtal clock X01, X02 and X03 adopt digital compensation crystal oscillator DCXO, voltage type crystal oscillator VCXO-1 and voltage type crystal oscillator VCXO-2 respectively;
Described employing level calibration mechanism keeps the clock synchronous of each level optical networking to refer to the order step by step continual automatic maintenance clock synchronous of whole system according to high-grade cesium-beam atomic clock → cesium-beam atomic clock or hydrogen atomic clock → rubidium atomic clock → DCXO → VCXO-1 → VCXO-2, comprise: set master-slave synchronisation relation respectively according to above-mentioned order, namely 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; Be all that benchmark keeps synchronous with major clock from clock;
Described employing single fiber bi-directional calibration steps realizes the clock synchronous of each level optical networking, comprise, clock synchronous is between the two ensured in the Single-fiber ultrahigh-precision time transmission method that all adopts between any two of all nodes connecting master-slave synchronisation relation two ends, namely main synchronous side is provided with main synchronizer, be provided with from synchronizer from synchronous side, master and slave synchronous side all adopts single fiber multiplexing equipment realization connection between the two; Compensated again after adopting the optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure; And using the clock of main synchronous side as time source; Wherein,
Main synchronizer: main tracking time source, and by temporal information modulating/demodulating on Snigle, complete overall delay measurement, time signal two-way pumping station;
From synchronizer: the phase locked track technology mainly realizing clock, realizes 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 different asymmetric difference caused of wavelength, completes the dynamic compensation of propagation delay time; Snigle adopts wavelength-division multiplex technique, the optical wavelength of transmission is changed, inverse transform is remake to opposite end, in same optical fiber, allow two optical wavelength by different optical channel transmission information separately simultaneously, make it take their own roads, thus realize light signal and transmit in opposite directions over the same fiber;
Further, by carrying out repeatedly duplicate measurements in the short time and compensating the jittering noise introduced in filtering optical fiber transmittance process; Removed due to temperature and aging and time-delay deviation that is that produce by the test of the optical-fiber time-delay of the discontinuity in cycle, peel off and the negative effect of segmentation optical-fiber time-delay drift accumulation.
Further, the present invention is based on the high precision time dissemination system of ground fiber optic network for the ground Big Dipper, compensated again after adopting the 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 set to the clock following the tracks of this level optical networking, its tracking accuracy is ± 1ns; By the 1PPS header signal modulating/demodulating with time signal on Snigle;
(2) carry out Frequency Synchronization from synchronizer, its tracking accuracy is≤5 × 10E-14;
(3) measure overall delay value, and calculate principal and subordinate time delay T by following formula
aB, temporal information is shifted to an earlier date T by phase shift network by main synchronizer
aB, thus, lock in time, precision can reach ± 5ns;
C＝T
AB+T
BA＝(T
ASS+T
ABλ1+T
BSR)+(T
BSS+T
BAλ2+T
ASR)(1)
In formula, T
aBbe main synchronous side to the time delay from synchronous side, T
bAfor from synchronous side to the time delay of main synchronous side, T
aSSbe transmission delay in main synchronous side equipment, T
aB λ 1be main synchronous side to the optical fiber transmission delay from synchronous side, T
bSRfor from receive time delay in synchronous side equipment, T
bSSfor from transmission delay in synchronous side equipment, T
bA λ 2for from synchronous side to the optical fiber transmission delay of 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 comprises from synchronizer, time delay processing module and Snigle from synchronous side;
(4) carry out Frequency Synchronization and time synchronized for a long time from synchronous side, 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 high precision time dissemination system of ground fiber optic network for the ground Big Dipper by carrying out repeatedly duplicate measurements in the short time and compensating the jittering noise introduced in filtering optical fiber transmittance process, comprise after adopting the optical-fiber time-delay value between master and slave synchronizer and changing value thereof precisely to measure and being compensated again, and in 1 second, carry out measurement and the compensation of more than 80 times.
Further, the present invention is based on ground fiber optic network removes due to temperature and aging and time-delay deviation that is that produce for the high precision time dissemination system of the ground Big Dipper by the test of the overall delay of the discontinuity in cycle, comprise after adopting the optical-fiber time-delay value between master and slave synchronizer and changing value thereof precisely to measure and being compensated again, and interval time is more than 500 seconds, peel off and split the negative effect of optical-fiber time-delay drift accumulation with this.
The present invention is based on ground fiber optic network for the Advantageous Effects of the high precision time dissemination system of the ground Big Dipper is to form the ground time dissemination system with space-based time dissemination system (such as GPS/GLONASS/ Beidou satellite navigation system) for subsequent use, mutual support each other, and there is the strong and survivability high of with low cost, antijamming capability, for the military-civil communication and navigation of China and positioning system provide the most basic time service service.
Accompanying drawing explanation
Accompanying drawing 1 the present invention is based on the high precision time dissemination system zero level net of ground fiber optic network for the ground Big Dipper and the structural representation of one-level net;
Accompanying drawing 2 the present invention is based on the high precision time dissemination system master and slave synchronous schematic diagram of ground fiber optic network for the ground Big Dipper.
Be further described the present invention is based on the high precision time dissemination system of ground fiber optic network for the ground Big Dipper below in conjunction with the drawings and specific embodiments.
Embodiment
Accompanying drawing 1 the present invention is based on the high precision time dissemination system zero level net of ground fiber optic network for the ground Big Dipper 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 present invention is based on ground fiber optic network and comprise setting zero level, one-level, secondary and three grades totally four level optical networkings for the high precision time dissemination system of the ground Big Dipper, level calibration mechanism is adopted to keep the clock synchronous of each level optical networking, single fiber bi-directional calibration steps is adopted to realize the clock synchronous of each level optical networking, wherein
Zero order light fibre web is polygonal gird node net, at least comprises the grid node of more than two, is at least provided with three routes between two 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 the cesium-beam atomic clock differing from 1 second in 6,000,000 years that at least one time service center is provided with precision, it is the high-grade cesium-beam atomic clock differing from 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 are drifted about and accumulated≤0.5ns/ days; Zero order light fibre web is using the 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 three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, one-level optical networking has at least three routes to be connected with zero order light fibre web, and 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 synchronous with the clock of zero order light fibre web, its Time and frequency standard should reach: relative frequency deviation≤± 5E-15/ days ~ ± 1E-14/ days, relative phase deviation≤± 1ns/ days, relative time-intervals deviation≤0.5ns ~ 1ns;
Secondary light fibre web is ring-type, tree-shaped or honeycomb grid node net, is at least provided with three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, secondary light fibre web has at least three routes to be connected with one-level optical networking, and wherein, one is normal open route, and other two is alternate routing; The grid node of secondary light fibre web is provided with rubidium atomic clock, and realizes synchronous 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 three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, 3-stage optical fiber net has at least three routes to be connected with secondary light fibre web, and wherein, one is normal open route, and other two is alternate routing; The grid node of three grades of bone optical fiber nets is provided with rubidium atomic clock or controlled xtal clock X01 or X02 or X03, and realizes synchronous with the clock of secondary light fibre web; Described controlled xtal clock X01, X02 and X03 adopt digital compensation crystal oscillator DCXO, voltage type crystal oscillator VCXO-1 and voltage type crystal oscillator VCXO-2 respectively;
Described employing level calibration mechanism keeps the clock synchronous of each level optical networking to refer to the order step by step continual automatic maintenance clock synchronous of whole system according to high-grade cesium-beam atomic clock → cesium-beam atomic clock or hydrogen atomic clock → rubidium atomic clock → DCXO → VCXO-1 → VCXO-2, comprise: set master-slave synchronisation relation respectively according to above-mentioned order, namely 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; Be all that benchmark keeps synchronous with major clock from clock;
Described employing single fiber bi-directional calibration steps realizes the clock synchronous of each level optical networking, comprise, clock synchronous is between the two ensured in the Single-fiber ultrahigh-precision time transmission method that all adopts between any two of all nodes connecting master-slave synchronisation relation two ends, namely main synchronous side is provided with main synchronizer, be provided with from synchronizer from synchronous side, master and slave synchronous side all adopts single fiber multiplexing equipment realization connection between the two, is compensated after adopting the 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 on Snigle, complete overall delay measurement, time signal two-way pumping station;
From synchronizer: the phase locked track technology mainly realizing clock, realizes 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 different asymmetric difference caused of wavelength, completes the dynamic compensation of propagation delay time; Snigle adopts wavelength-division multiplex technique, the optical wavelength of transmission is changed, inverse transform is remake to opposite end, in same optical fiber, allow two optical wavelength by different optical channel transmission information separately simultaneously, make it take their own roads, thus realize light signal and transmit in opposite directions over the same fiber;
Further, by carrying out repeatedly duplicate measurements in the short time and compensating the jittering noise introduced in filtering optical fiber transmittance process; Removed due to temperature and aging and time-delay deviation that is that produce by the test of the overall delay of the discontinuity in cycle, peel off and the negative effect of segmentation optical-fiber time-delay drift accumulation.
Accompanying drawing 2 the present invention is based on the high precision time dissemination system master-slave synchronisation schematic diagram of ground fiber optic network for the ground Big Dipper, 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, single fiber bi-directional calibration steps is adopted to realize the clock synchronous of each level optical networking, comprise, clock synchronous is between the two ensured in the Single-fiber ultrahigh-precision time transmission method that all adopts between any two of all nodes connecting master-slave synchronisation relation two ends, namely main synchronous side is provided with main synchronizer, be provided with from synchronizer from synchronous side, master and slave synchronous side all adopts single fiber multiplexing equipment realization connection between the two, is compensated after adopting the 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 on Snigle, complete overall delay measurement, time signal two-way pumping station;
From synchronizer: the phase locked track technology mainly realizing clock, realizes 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 different asymmetric difference caused of wavelength, completes the dynamic compensation of propagation delay time; Single fiber multiplexing equipment adopts wavelength-division multiplex technique, the optical wavelength of transmission is changed, remakes inverse transform to opposite end, in same optical fiber, allow two optical wavelength by different optical channel transmission information separately simultaneously, make it take their own roads, thus realize light signal and transmit in opposite directions over the same fiber;
Concrete steps comprise:
(1) time synchronized of main synchronizer is set to the clock following the tracks of this level optical networking, its tracking accuracy is ± 1ns; By the 1PPS header signal modulating/demodulating with time signal on Snigle;
(2) carry out Frequency Synchronization from synchronizer, its tracking accuracy is ± 5E-14;
(3) measure overall delay value, and calculate principal and subordinate time delay T by following formula
aB, temporal information is shifted to an earlier date T by phase shift network by main synchronizer
aB, thus, lock in time, precision can reach ± 5ns;
C＝T
AB+T
BA＝(T
ASS+T
ABλ1+T
BSR)+(T
BSS+T
BAλ2+T
ASR)(1)
In formula, T
aBbe main synchronous side to the time delay from synchronous side, T
bAfor from synchronous side to the time delay of main synchronous side, T
aSSbe transmission delay in main synchronous side equipment, T
aB λ 1be main synchronous side to the optical fiber transmission delay from synchronous side, T
bSRfor from receive time delay in synchronous side equipment, T
bSSfor from transmission delay in synchronous side equipment, T
bA λ 2for from synchronous side to the optical fiber transmission delay of 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 comprises from synchronizer, time delay processing module and Snigle from synchronous side;
(4) carry out Frequency Synchronization and time synchronized for a long time from synchronous side, 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 introduced in filtering optical fiber transmittance process, the present invention is based on the high precision time dissemination system of ground fiber optic network for the ground Big Dipper by carrying out repeatedly duplicate measurements in the short time and filtering is carried out in compensation, comprise after adopting the optical-fiber time-delay value between master and slave synchronizer and changing value thereof precisely to measure and being compensated again, and in 1 second, carry out measurement and the compensation of more than 80 times.
For removing due to temperature and aging and time-delay deviation that is that produce, the present invention is based on ground fiber optic network to be removed by the overall delay test of discontinuity for the high precision time dissemination system of the ground Big Dipper, comprise after adopting the optical-fiber time-delay value between master and slave synchronizer and changing value thereof precisely to measure and being compensated again, and interval time is more than 500 seconds.
The present invention is based on ground fiber optic network for the Advantageous Effects of the high precision time dissemination system of the ground Big Dipper is to form the ground time dissemination system with space-based time dissemination system (such as GPS/GLONASS/ Beidou satellite navigation system) for subsequent use, mutual support each other, and there is the strong and survivability high of with low cost, antijamming capability, for the military-civil communication and navigation of China and positioning system provide the most basic time service service.
Claims (4)
1. one kind is used for the high precision time dissemination system of the ground Big Dipper based on ground fiber optic network, it is characterized in that: this system comprises zero level, one-level, secondary and three grades totally four level optical networkings, level calibration mechanism is adopted to keep the clock synchronous of each level optical networking, single fiber bi-directional calibration steps is adopted to realize the clock synchronous of each level optical networking, wherein
Zero order light fibre web is polygonal gird node net, at least comprises the grid node of more than two, is at least provided with three routes between two 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 the cesium-beam atomic clock differing from 1 second in 6,000,000 years that at least one time service center is provided with precision, it is the high-grade cesium-beam atomic clock differing from 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 relative clock drift accumulate≤0.5ns/ days; Zero order light fibre web is using the 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 three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, one-level optical networking has at least three routes to be connected with zero order light fibre web, and 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 synchronous with the clock of zero order light fibre web, its Time and frequency standard should reach: relative frequency deviation≤± 5E-15/ days ~ ± 1E-14/ days, relative phase deviation≤± 1ns/ days, relative time-intervals deviation≤0.5ns ~ 1ns;
Secondary light fibre web is ring-type, tree-shaped or honeycomb grid node net, is at least provided with three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, secondary light fibre web has at least three routes to be connected with one-level optical networking, and wherein, one is normal channel primary route, and other two is alternate routing; The grid node of secondary light fibre web is provided with rubidium atomic clock, and realizes synchronous 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 three routes between two between grid node, and wherein, one is normal open route, and other two is alternate routing; Further, 3-stage optical fiber net has at least three routes to be connected with secondary light fibre web, and wherein, one is normal open route, and other two is alternate routing; The grid node of three grades of bone optical fiber nets is provided with rubidium atomic clock or controlled xtal clock X01 or X02 or X03, and realizes synchronous with the clock of secondary light fibre web; Described controlled xtal clock X01, X02 and X03 adopt digital compensation crystal oscillator DCXO, voltage type crystal oscillator VCXO-1 and voltage type crystal oscillator VCXO-2 respectively;
Described employing level calibration mechanism keeps the clock synchronous of each level optical networking to refer to the order step by step continual automatic maintenance clock synchronous of whole system according to high-grade cesium-beam atomic clock → cesium-beam atomic clock or hydrogen atomic clock → rubidium atomic clock → DCXO → VCXO-1 → VCXO-2, comprise: set master-slave synchronisation relation respectively according to above-mentioned order, namely 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; Be all that benchmark keeps synchronous with major clock from clock;
Described employing single fiber bi-directional calibration steps realizes the clock synchronous of each level optical networking, comprise, clock synchronous is between the two ensured in the Single-fiber ultrahigh-precision time transmission method that all adopts between any two of all nodes connecting master-slave synchronisation relation two ends, namely main synchronous side is provided with main synchronizer, be provided with from synchronizer from synchronous side, master and slave synchronous side all adopts single fiber multiplexing equipment realization connection between the two; Compensated again after adopting the optical-fiber time-delay value between master and slave synchronous side synchronizer and changing value thereof precisely to measure; And using the clock of main synchronous side as time source; Wherein,
Main synchronizer: main tracking time source, and by temporal information modulating/demodulating on Snigle, complete overall delay measurement, time signal two-way pumping station;
From synchronizer: the phase locked track technology mainly realizing clock, realizes 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 different asymmetric difference caused of wavelength, completes the dynamic compensation of propagation delay time; Snigle adopts wavelength-division multiplex technique, the optical wavelength of transmission is changed, inverse transform is remake to opposite end, in same optical fiber, allow two optical wavelength by different optical channel transmission information separately simultaneously, make it take their own roads, thus realize light signal and transmit in opposite directions over the same fiber;
Further, by carrying out repeatedly duplicate measurements in the short time and compensating the jittering noise introduced in filtering optical fiber transmittance process; Removed due to temperature and aging and time-delay deviation that is that produce by the test of the optical-fiber time-delay of the discontinuity in cycle.
2. the high precision time dissemination system of the ground Big Dipper is used for according to claim 1 based on ground fiber optic network, it is characterized in that: compensated again after adopting the 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 set to the clock following the tracks of this level optical networking, its tracking accuracy is ± 1ns; By the 1PPS header signal modulating/demodulating with time signal on Snigle;
(2) carry out Frequency Synchronization from synchronizer, its tracking accuracy is≤5 × 10E-14;
(3) measure overall delay value, and calculate principal and subordinate time delay T by following formula
aB, temporal information is shifted to an earlier date T by phase shift network by main synchronizer
aB, thus, lock in time, precision can reach ± 5ns;
In formula, T
aBbe main synchronous side to the time delay from synchronous side, T
bAfor from synchronous side to the time delay of main synchronous side, T
aSSbe transmission delay in main synchronous side equipment,
be main synchronous side to the optical fiber transmission delay from synchronous side, T
bSRfor from receive time delay in synchronous side equipment, T
bSSfor from transmission delay in synchronous side equipment,
for from synchronous side to the optical fiber transmission delay of 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, and single fiber multiplexing equipment comprises time delay processing module and Snigle; Describedly comprise from synchronizer, single fiber multiplexing equipment from synchronous side, single fiber multiplexing equipment comprises time delay processing module and Snigle;
(4) carry out Frequency Synchronization and time synchronized for a long time from synchronous side, guarantee to obtain every pulse per second (PPS) 1PPS signal accurately, guarantee from synchronous side clock and main synchronous side clock synchronous.
3. the high precision time dissemination system of the ground Big Dipper is used for according to claim 1 based on ground fiber optic network, it is characterized in that: by carrying out repeatedly duplicate measurements in the short time and compensating the jittering noise introduced in filtering optical fiber transmittance process, comprise after adopting the optical-fiber time-delay value between master and slave synchronizer and changing value thereof precisely to measure and being compensated again, and in 1 second, carry out measurement and the compensation of more than 80 times.
4. the high precision time dissemination system of the ground Big Dipper is used for according to claim 1 based on ground fiber optic network, it is characterized in that: remove due to temperature and aging and time-delay deviation that is that produce by the test of the overall delay of the discontinuity in cycle, comprise after adopting the optical-fiber time-delay value between master and slave synchronizer and changing value thereof precisely to measure and being compensated again, and interval time is more than 500 seconds, peel off and split the negative effect of optical-fiber time-delay drift accumulation with this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310562284.9A CN103576542B (en) | 2013-11-12 | 2013-11-12 | The high precision time dissemination system of the ground Big Dipper is used for based on ground fiber optic network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310562284.9A CN103576542B (en) | 2013-11-12 | 2013-11-12 | The high precision time dissemination system of the ground Big Dipper is used for based on ground fiber optic network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103576542A CN103576542A (en) | 2014-02-12 |
| CN103576542B true CN103576542B (en) | 2016-02-03 |
Family
ID=50048561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310562284.9A Active CN103576542B (en) | 2013-11-12 | 2013-11-12 | The high precision time dissemination system of the ground Big Dipper is used for based on ground fiber optic network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103576542B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN106034003B (en) * | 2015-03-10 | 2019-05-17 | 四川泰富地面北斗科技股份有限公司 | Method based on double-fiber transmitting ultraprecise frequency time signal |
| 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 |
| US10887038B2 (en) * | 2018-09-28 | 2021-01-05 | Samsung Electronics Co., Ltd. | GNSS-based multi-modal clock correction |
| CN109412692B (en) * | 2018-10-30 | 2021-05-18 | 中国科学院国家授时中心 | Distributed optical fiber time service system and sagnac effect compensation method thereof |
| 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 |
| 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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107490A (en) * | 1985-04-24 | 1992-04-21 | Artel Communications Corporation | Ring-type communication network |
| CN102468898A (en) * | 2010-11-19 | 2012-05-23 | 中兴通讯股份有限公司 | Method, equipment and system for achieving time synchronization in time division multiplexing network |
| CN102664700A (en) * | 2012-04-13 | 2012-09-12 | 烽火通信科技股份有限公司 | Synchronous planning method of node clock in mesh network |
-
2013
- 2013-11-12 CN CN201310562284.9A patent/CN103576542B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107490A (en) * | 1985-04-24 | 1992-04-21 | Artel Communications Corporation | Ring-type communication network |
| CN102468898A (en) * | 2010-11-19 | 2012-05-23 | 中兴通讯股份有限公司 | Method, equipment and system for achieving time synchronization in time division multiplexing network |
| CN102664700A (en) * | 2012-04-13 | 2012-09-12 | 烽火通信科技股份有限公司 | Synchronous planning method of node clock in mesh network |
Non-Patent Citations (1)
| Title |
|---|
| 光纤DWDM双向比对法授时的误差分析;丁小玉等;《2009时间频率学术会议》;20091022;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103576542A (en) | 2014-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103576542B (en) | The high precision time dissemination system of the ground Big Dipper is used for based on ground fiber optic network | |
| CN103546224B (en) | Single-fiber ultrahigh-precision time transmission method | |
| US8600239B2 (en) | Precise clock synchronization over optical fiber | |
| CN102916743B (en) | The method of the asymmetric difference accurate measurement of a kind of time delay | |
| CN102299743B (en) | Post-compensation method for transmission time delay during optical fiber time transmission | |
| CN104954093B (en) | A kind of High Precision Long-distance Time Transmission system and method based on optical fiber | |
| CN104506269B (en) | High-precision optical fiber two-way time transfer method and system based on loopback method | |
| CN104993896A (en) | Time-giving system composed of dedicated optical route and method for implementing same | |
| CN102833025B (en) | E1/Ethernet protocol conversion precise delay computational methods, module and transducer | |
| CN105933085B (en) | The method for measuring asymmetric fiber loop chain circuit transmission time delay | |
| US9172525B2 (en) | Method and device for compensating for time path | |
| US20140270805A1 (en) | Asymmetry Correction for Precise Clock Synchronization Over Optical Fiber | |
| CN108768506B (en) | Multi-element multi-frequency common-view comparison time service method based on common threshold | |
| CN103916204B (en) | A kind of cloud synchronous method of fiber optic network high-precision time dissemination system | |
| CN102271019A (en) | Precision time transfer over optical fiber | |
| CN110784783B (en) | Clock synchronization method and device based on optical fiber network | |
| CN102340354A (en) | Method for eliminating asymmetrical delay for optical fiber time transmission through wavelength division multiplexing | |
| CN105187275A (en) | Method and device for measuring optical fiber transmission link asymmetric time delay | |
| CN109039453A (en) | A kind of measuring system and measurement method of transmission fiber delay | |
| Gong et al. | Sub-nanosecond timing system design and development for LHAASO project | |
| CN103441795A (en) | Online monitoring method for optical fiber transmission delay in optical communication network | |
| CN102158298B (en) | High-accuracy time frequency delivery method based on synchronous digital hierarchy (SDH) optical network | |
| CN103546225A (en) | Phototiming network timing system and timing method | |
| Vojtech et al. | Photonic services, their enablers and applications | |
| CN102546072A (en) | Regenerative UTC (Universal Time Coordinated) atomic time ultrahigh precision time frequency synchronization network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160511 Address after: High tech Zone Chengdu city Sichuan province 610000 Gaopeng Road No. 2 pump run Technology Park Room 402 Patentee after: SICHUAN TAIFU GROUND COMPASS TECHNOLOGY CO., LTD. Address before: 610000 Sichuan Province, Chengdu City People's Road four No. 21 Bangkok Garden Patentee before: Chengdu Taifu Communication Co., Ltd. |