CN103812553B - High-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method - Google Patents

Abstract

A kind of high-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method, including step: 1. set up optical fiber bidirectional Time transfer receiver equipment delay calibration system；2. the reception chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calibrated poor；3. the reception chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calibrated poor；4. the time delay unsymmetry between optical fiber bidirectional Time transfer receiver equipment is calibrated.The present invention can not only calibrate the unsymmetry of time delay between optical fiber bidirectional Time transfer receiver equipment simply and easily, and time delay unsymmetry between any time-frequency equipment can be calibrated, effectively overcome the impact that time delay accuracy is brought by optical fiber or cable time delay difference.

Description

High-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method

Technical field

The present invention relates to the scaling method of optical fiber time field of synchronization equipment delay, specifically a kind of high-precision optical fiber is two-way Time transfer receiver equipment delay unsymmetry scaling method.

Background technology

Equipment delay refers to the additional time delay that signal produces through equipment, is the inherent character of equipment.High-precision optical fiber Two-way Time transfer receiver is sent and receives timing signal and carries out time synchronized, obtaining of precise time synchronization accuracy by optical fiber link Take and need to deduct optical fiber time comparison equipment delay unsymmetry, just can obtain clock correction accurately.Therefore, optical fiber time synchronizes to set The stated accuracy of standby time delay unsymmetry own synchronizes the precision of system by directly affecting optical fiber time, is that optical fiber time synchronizes system One key technology of system.

At present, in time synchronized based on satellite and cable, system calibrating mainly carrys out calibration system by the time delay measuring electricity Time delay, the equipment delay measuring method of employing mainly has vector network analyzer method, oscilloscope method and time-interval counter Method etc..It is double that German federal physical technique academy (federal physical technique academy) proposes a kind of optical fiber based on satellite equipment To Time transfer receiver equipment delay unsymmetry method (Rost, M., et al. " Time transfer through optical fibres over a distance of 73km with an uncertainty below 100ps."Metrologia 49.6 (2012): 772.), but it cannot deduct the impact that equipment accuracy is brought by optical fiber and cable.

Summary of the invention

It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of two-way Time transfer receiver of high-precision optical fiber Equipment delay unsymmetry scaling method, passes through combination measurement method, it is achieved optical fiber bidirectional Time transfer receiver equipment delay is asymmetric The high-precision calibrating of property.

Equipment delay refers to the time delay needed for signal is from equipment input port to output port.By the optical fiber bidirectional time Comparison equipment delay is divided into transmitting chain time delay and receives chain-circuit time delay: the starting point of transmitting chain time delay is to be passed on equipment to determine Time signal input port, the terminal of transmitting chain time delay is the light signal output end carrying on equipment and being passed timing signal Mouthful；The starting point receiving chain-circuit time delay is to receive the input port of optical signal of carrying the other side's timing signal on equipment, terminal be from The output port of the timing signal that the other side receives.

Transmitting equipment delay is from the link of following two introducing time delay: time encoding processing delayElectric light turns Change the time delay introduced with fiber duplex device (optical fiber duplexer, such as circulator, WDM etc.)Therefore, send out Penetrate chain-circuit time delay can be expressed as:

Similar to launching equipment delay, receive equipment delay also from two links introducing time delay: opto-electronic conversion and light The time delay that fine duplexer (optical fiber duplexer, such as circulator, WDM etc.) introducesTime decoder circuit Time delayTherefore, receive chain-circuit time delay can be expressed as: ${\mathrm{\τ}}_i^R={\mathrm{\τ}}_{EDi}^R+{\mathrm{\τ}}_{Ti}^R.$

The present invention measures two-way Time transfer receiver system terminal device respectively by the method for combination latency measurement and (is designated as equipment A and equipment B) receive chain-circuit time delay unsymmetry (that is: two equipment rooms receive links delay inequality,) and send link Time delay not to property (that is: two equipment rooms send links delay inequality,).On this basis, two optical fiber are calibrated further The unsymmetry of two-way Time transfer receiver equipment delay ${\mathrm{\Δ\τ}}_{AB}={\mathrm{\Δ\τ}}_{AB}^T-{\mathrm{\Δ\τ}}_{AB}^R.$

The concrete technical solution of the present invention is as follows:

A kind of high-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method, its feature is, the method Comprise the steps:

1. use time and frequency standards, cable, optical fiber, optical fiber bidirectional Time transfer receiver calibration facility, high-precision time-delay test equipment, First equipment to be calibrated and the second equipment to be calibrated set up optical fiber bidirectional Time transfer receiver equipment delay calibration system；

2. the reception chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calibrated poor；

3. the reception chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calibrated poor；

4. the time delay unsymmetry between optical fiber bidirectional Time transfer receiver equipment is calibrated.

1. described step sets up optical fiber bidirectional Time transfer receiver equipment delay calibration system, including the first time and frequency standards, Two time and frequency standards, multi-cable, multifiber, the first optical fiber bidirectional Time transfer receiver calibration facility, the second optical fiber bidirectional time ratio To calibration facility, the first high-precision time-delay test equipment, the second high-precision time-delay test equipment, optical fiber bidirectional time to be calibrated Comparison equipment i (i=A, B)；

First outfan of the first described time and frequency standards through cable and the first high-precision time-delay test equipment first defeated Entering end to connect, the second outfan of the first described time and frequency standards is through cable and the first optical fiber bidirectional Time transfer receiver calibration facility Input connects, and the outfan of this first optical fiber bidirectional Time transfer receiver calibration facility is through optical fiber and optical fiber bidirectional time to be calibrated The input of comparison equipment i (i=A, B) connects, the outfan of this optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated The second input testing equipment through cable and the first high-precision time-delay connects；

First outfan of the second described time and frequency standards through cable and the second high-precision time-delay test equipment first defeated Entering end to connect, the second outfan of the second described time and frequency standards is through cable and optical fiber bidirectional Time transfer receiver equipment i to be calibrated The input of (i=A, B) connects, and this optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated is through optical fiber and the second optical fiber The input of two-way Time transfer receiver calibration facility connects, and the outfan of this second optical fiber bidirectional Time transfer receiver calibration facility is through cable It is connected with the second input of the second high-precision time-delay test equipment.

The reception chain-circuit time delay that 2. described step calibrates between optical fiber bidirectional Time transfer receiver equipment is poor, specifically include as Lower step；

Step 2-1, the timing information of the first time and frequency standards output are divided into two-way: a road timing information is input to by cable High-precision time-delay test equipment；Another road timing information is input to the first optical fiber bidirectional Time transfer receiver calibration facility by cable, The optical signal carrying timing information of this first optical fiber bidirectional Time transfer receiver calibration facility output is input to be calibrated by optical fiber Optical fiber bidirectional Time transfer receiver equipment i (i=A, B), the timing information of this optical fiber bidirectional Time transfer receiver equipment i output to be calibrated It is input to high-precision time-delay test equipment by cable；

Step 2-2, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the first equipment to be calibrated:

First high-precision time-delay test device measuring goes out the timing information of the first time and frequency standards output by cable, the first light The list that the transmission link of fine two-way Time transfer receiver calibration facility, optical fiber, the reception link of the first equipment to be calibrated and cable are constituted The timing information exported to Time Transmission link and the first time and frequency standards is input to high-precision time-delay test equipment by cable Delay inequality

Step 2-3, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the second equipment to be calibrated:

First high-precision time-delay test device measuring goes out the timing information of the first time and frequency standards output by cable, the first light The list that the transmission link of fine two-way Time transfer receiver calibration facility, optical fiber, the reception link of the second equipment to be calibrated and cable are constituted The timing information exported to Time Transmission link and the first time and frequency standards is input to high-precision time-delay test equipment by cable Delay inequality

Step 2-4, the reception chain-circuit time delay calculated between optical fiber bidirectional Time transfer receiver equipment are poorFormula is as follows:

${\mathrm{\Δ\τ}}_{AB}^R={\mathrm{\τ}}_A^R-{\mathrm{\τ}}_B^R.$

The reception chain-circuit time delay that 3. described step calibrates between optical fiber bidirectional Time transfer receiver equipment is poor, including walking as follows Rapid:

Step 3-1, the timing information of the second time and frequency standards output are divided into two-way: a road timing information is input to by cable Second high-precision time-delay test equipment, another road timing information is input to optical fiber bidirectional Time transfer receiver to be calibrated by cable and sets Standby i (i=A, B), the optical signal carrying timing information of optical fiber bidirectional Time transfer receiver equipment i output to be calibrated is defeated by optical fiber Entering to the second optical fiber bidirectional Time transfer receiver calibration facility, the timing information of the second optical fiber bidirectional Time transfer receiver calibration facility output leads to Cross cable and be input to the second high-precision time-delay test equipment；

Step 3-2, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the first equipment to be calibrated, second High-precision time-delay test device measuring go out second time and frequency standards output timing information by cable, the first equipment to be calibrated send out Link, optical fiber, the reception link of the second optical fiber bidirectional Time transfer receiver calibration facility and cable is sent to constitute unidirectional Time Transmission link It is input to the second high-precision time-delay with the timing signal of the second time and frequency standards output by cable and tests the delay inequality of equipment

Step 3-3, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the second equipment to be calibrated, second High-precision time-delay test device measuring go out second time and frequency standards output timing information by cable, the second equipment to be calibrated send out Link, optical fiber, the reception link of the second optical fiber bidirectional Time transfer receiver calibration facility and cable is sent to constitute unidirectional Time Transmission link It is input to the second high-precision time-delay with the timing signal of the second time and frequency standards output by cable and tests the delay inequality of equipment

4) the reception chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calculated poorFormula is as follows:

${\mathrm{\Δ\τ}}_{AB}^T={\mathrm{\τ}}_A^T-{\mathrm{\τ}}_B^T.$

4. described step calibrates the time delay unsymmetry Δ τ between optical fiber bidirectional Time transfer receiver equipment_AB, formula is as follows

${\mathrm{\Δ\τ}}_{AB}={\mathrm{\Δ\τ}}_{AB}^T-{\mathrm{\Δ\τ}}_{AB}^R$

Wherein,For sending the delay inequality of link,For receiving the delay inequality of link.

Compared with prior art, the present invention can not only calibrate between optical fiber bidirectional Time transfer receiver equipment simply and easily The unsymmetry of time delay, and any time-frequency equipment delay unsymmetry can be calibrated, and can effectively overcome optical fiber Or the impact that accuracy is brought by cable time delay difference.

Accompanying drawing explanation

Fig. 1 receives chain-circuit time delay difference and demarcates schematic diagram；

Fig. 2 sends chain-circuit time delay difference and demarcates schematic diagram.

Detailed description of the invention

One that provides the present invention below in conjunction with the accompanying drawings is embodied as example.The present embodiment is the technical scheme is that Premise is implemented, give detailed embodiment and and concrete workflow, but protection scope of the present invention is not limited to Following embodiment.

Fig. 1 is the demarcation schematic diagram receiving chain-circuit time delay difference, mainly by the first time and frequency standards H₁, the first optical fiber bidirectional time Comparison calibration facility C₁, optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated, first high-precision time-delay measure equipment M₁, electricity Cable and optical fiber composition.First time and frequency standards H₁The timing information that (such as various atomic clocks) export is divided into two-way.One tunnel timing letter Cease and be input to the first high-precision time-delay test equipment M by cable 1-1₁(such as time interval measuring instrucment, oscillograph etc.)；Another road Timing information is input to the first optical fiber bidirectional Time transfer receiver calibration facility C by cable 1-2₁, this first optical fiber bidirectional time ratio To calibration facility C₁The optical signal carrying timing information of output is input to optical fiber bidirectional Time transfer receiver to be calibrated by optical fiber 1-3 The timing information of equipment i (i=A, B), equipment i output is input to the first high-precision time-delay by cable 1-4 and measures equipment M₂.When When optical fiber bidirectional Time transfer receiver equipment i to be calibrated is device A, the first high-precision time-delay test equipment M₁Measure the first time-frequency base Quasi-H₁The timing information (such as 1pps) of output is by cable 1-2, the first optical fiber bidirectional Time transfer receiver calibration facility C₁Transmission chain Road, optical fiber 1-3, the reception link of device A and cable 1-4 constitute unidirectional Time Transmission link and the first time and frequency standards H₁Output Timing signal (such as 1pps) by cable 1-1 be input to first high-precision time-delay test equipment M₁Delay inequality:When treating When demarcation optical fiber bidirectional Time transfer receiver equipment i is equipment B, measure the first time and frequency standards H₁The timing information (such as 1pps) of output By cable 1-2, the first optical fiber bidirectional Time transfer receiver calibration facility C₁Send link, optical fiber 1-3, the reception link of equipment B And cable 1-4 constitute unidirectional Time Transmission link and the first time and frequency standards H₁The timing signal (such as 1pps) of output is by electricity Cable 1-1 is input to the first high-precision time-delay test equipment M₁Delay inequality:WillWithThe result measured is subtracted each other and is set Standby A and B receives the delay inequality of link

Fig. 2 is the demarcation schematic diagram sending chain-circuit time delay difference, mainly by the second time and frequency standards H₂, the second optical fiber bidirectional time Comparison calibration facility C₂, optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated, second high-precision time-delay measure equipment M₂, electricity Cable and optical fiber composition.Second time and frequency standards H₂The timing information that (such as various atomic clocks) export is divided into two-way one road timing information It is input to the second high-precision time-delay test equipment M by cable 2-1₂(such as time interval measuring instrucment, oscillograph etc.).Another road is fixed Time information be input to optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated by cable 2-2, i output carry timing The optical signal of information is input to the second optical fiber bidirectional Time transfer receiver calibration facility C by optical fiber 2-3₂。C₂The timing information of output leads to Cross cable 2-4 and be input to the second high-precision time-delay test equipment M₂.When optical fiber bidirectional Time transfer receiver equipment i to be calibrated is device A Time, the second high-precision time-delay test equipment M₂Measure the second time and frequency standards H₂The timing information (such as 1pps) of output passes through cable 2-2, the transmission link of device A, optical fiber 2-3, the second optical fiber bidirectional Time transfer receiver calibration facility C₂Reception link and cable 2-4 constitutes unidirectional Time Transmission link and the second time and frequency standards H₂The timing signal (such as 1pps) of output is inputted by cable 2-1 To the second high-precision time-delay test equipment M₂Delay inequality:When optical fiber bidirectional Time transfer receiver equipment i to be calibrated is B, the Two high-precision time-delay test equipment M₂Measure the second time and frequency standards H₂The timing information (such as 1pps) of output passes through cable 2-2, sets Standby the transmission link of B, optical fiber 2-3, the second optical fiber bidirectional Time transfer receiver calibration facility C₂Reception link and cable 2-4 constitute Unidirectional Time Transmission link and the second time and frequency standards H₂It is high that the timing signal (such as 1pps) of output is input to second by cable 2-1 Precision delay testing equipment M₂Delay inequality:By above-mentionedWithThe result of middle measurement is subtracted each other and is obtained device A and B transmission The delay inequality of link

The delay inequality sending link will be calibratedWith the delay inequality receiving linkSubtract each other when obtaining two optical fiber bidirectionals Between the unsymmetry of comparison equipment delay

Claims (4)

1. a high-precision optical fiber two-way Time transfer receiver equipment delay unsymmetry scaling method, it is characterised in that the method bag Include following steps:

1. use time and frequency standards, cable, optical fiber, optical fiber bidirectional Time transfer receiver calibration facility, high-precision time-delay test equipment, first Equipment to be calibrated and the second equipment to be calibrated set up optical fiber bidirectional Time transfer receiver equipment delay calibration system；This optical fiber bidirectional time Comparison equipment delay calibration system, including the first time and frequency standards, the second time and frequency standards, multi-cable, multifiber, the first optical fiber Two-way Time transfer receiver calibration facility, the second optical fiber bidirectional Time transfer receiver calibration facility, first high-precision time-delay test equipment, second High-precision time-delay test equipment, optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated；

The first described time and frequency standards (H₁) the first outfan through cable (1-1) with first high-precision time-delay test equipment (M₁) First input end connect, the first described time and frequency standards (H₁) the second outfan through cable (1-2) and the first optical fiber bidirectional Time transfer receiver calibration facility (C₁) input connect, this first optical fiber bidirectional Time transfer receiver calibration facility (C₁) outfan warp Optical fiber (1-3) connects with the input of optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated, and this optical fiber to be calibrated is double To the outfan of Time transfer receiver equipment i (i=A, B) through cable (1-4) and the first high-precision time-delay test equipment (M₁) second Input connects；

The second described time and frequency standards (H₂) the first outfan through cable (2-1) with second high-precision time-delay test equipment (M₂) First input end connect, the second described time and frequency standards (H₂) the second outfan through cable (2-2) and optical fiber to be calibrated The input of two-way Time transfer receiver equipment i (i=A, B) connects, this optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated Through optical fiber (2-3) and the second optical fiber bidirectional Time transfer receiver calibration facility (C₂) input connect, this second optical fiber bidirectional time Comparison calibration facility (C₂) outfan through cable (2-4) with second high-precision time-delay test equipment (M₂) the second input even Connect；

2. the reception chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calibrated poor；

3. the transmission chain-circuit time delay between optical fiber bidirectional Time transfer receiver equipment is calibrated poor；

4. the time delay unsymmetry between optical fiber bidirectional Time transfer receiver equipment is calibrated.

High-precision optical fiber the most according to claim 1 two-way Time transfer receiver equipment delay unsymmetry scaling method, it is special Levying and be, the reception chain-circuit time delay that 2. described step calibrates between optical fiber bidirectional Time transfer receiver equipment is poor, specifically include as Lower step；

Step 2-1, the first time and frequency standards (H₁) timing information that exports is divided into two-way: a road timing information is defeated by cable (1-1) Enter to the first high-precision time-delay test equipment (M₁)；Another road timing information is input to the first optical fiber bidirectional by cable (1-2) Time transfer receiver calibration facility (C₁), this first optical fiber bidirectional Time transfer receiver calibration facility (C₁) light carrying timing information that exports Signal is input to optical fiber bidirectional Time transfer receiver equipment i (i=A, B) to be calibrated by optical fiber (1-3), and this optical fiber to be calibrated is double It is input to the first high-precision time-delay test equipment (M by cable (1-4) to the timing information of Time transfer receiver equipment i output₁)；

Step 2-2, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the first equipment to be calibrated (A):

First high-precision time-delay test equipment (M₁) measure the first time and frequency standards (H₁) timing information that exports is by cable (1- 2), the first optical fiber bidirectional Time transfer receiver calibration facility (C₁) transmission link, optical fiber (1-3), the connecing of first equipment to be calibrated (A) Receive unidirectional Time Transmission link and the first time and frequency standards (H that link and cable (1-4) are constituted₁) timing information that exports is by electricity Cable (1-1) is input to the first high-precision time-delay test equipment (M₁) delay inequality

Step 2-3, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the second equipment to be calibrated (B):

First high-precision time-delay test equipment (M₁) measure the first time and frequency standards (H₁) timing information that exports is by cable (1- 2), the first optical fiber bidirectional Time transfer receiver calibration facility (C₁) transmission link, optical fiber (1-3), the connecing of second equipment to be calibrated (B) Receive unidirectional Time Transmission link and the first time and frequency standards (H that link and cable (1-4) are constituted₁) timing information that exports is by electricity Cable (1-1) is input to the first high-precision time-delay test equipment (M₁) delay inequality

Step 2-4, the reception chain-circuit time delay calculated between optical fiber bidirectional Time transfer receiver equipment are poorFormula is as follows:

${\mathrm{\Δ\τ}}_{AB}^R={\mathrm{\τ}}_A^R-{\mathrm{\τ}}_B^R.$

High-precision optical fiber the most according to claim 1 two-way Time transfer receiver equipment delay unsymmetry scaling method, it is special Levying and be, the transmission chain-circuit time delay that 3. described step calibrates between optical fiber bidirectional Time transfer receiver equipment is poor, including walking as follows Rapid:

Step 3-1, the second time and frequency standards (H₂) timing information that exports is divided into two-way: a road timing information is defeated by cable (2-1) Enter to the second high-precision time-delay test equipment (M₂), another road timing information is input to optical fiber to be calibrated by cable (2-2) Two-way Time transfer receiver equipment i (i=A, B), the light carrying timing information of optical fiber bidirectional Time transfer receiver equipment i output to be calibrated Signal is input to the second optical fiber bidirectional Time transfer receiver calibration facility (C by optical fiber (2-3)₂), the second optical fiber bidirectional Time transfer receiver Calibration facility (C₂) timing information that exports is input to the second high-precision time-delay test equipment (M by cable (2-4)₂)；

Step 3-2, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the first equipment to be calibrated (A):

Second high-precision time-delay test equipment (M₂) measure the second time and frequency standards (H₂) timing information that exports is by cable (2- 2), the transmission link of the first equipment to be calibrated (A), optical fiber (2-3), the second optical fiber bidirectional Time transfer receiver calibration facility (C₂) connect Receive link and cable (2-4) constitutes unidirectional Time Transmission link and the second time and frequency standards (H₂) timing signal that exports passes through cable (2-1) the second high-precision time-delay test equipment (M it is input to₂) delay inequality

Step 3-3, when described optical fiber bidirectional Time transfer receiver equipment i to be calibrated is the first equipment to be calibrated (B):

Second high-precision time-delay test equipment (M₂) measure the second time and frequency standards (H₂) timing information that exports is by cable (2- 2), the transmission link of the second equipment to be calibrated (B), optical fiber (2-3), the second optical fiber bidirectional Time transfer receiver calibration facility (C₂) connect Receive link and cable (2-4) constitutes unidirectional Time Transmission link and the second time and frequency standards (H₂) timing signal that exports passes through cable (2-1) the second high-precision time-delay test equipment (M it is input to₂) delay inequality

Step 3-4, the transmission chain-circuit time delay calculated between optical fiber bidirectional Time transfer receiver equipment are poorFormula is as follows:

${\mathrm{\Δ\τ}}_{AB}^T={\mathrm{\τ}}_A^T-{\mathrm{\τ}}_B^T.$

High-precision optical fiber the most according to claim 1 two-way Time transfer receiver equipment delay unsymmetry scaling method, it is special Levying and be, 4. described step calibrates the time delay unsymmetry Δ τ between optical fiber bidirectional Time transfer receiver equipment_AB, formula is as follows

${\mathrm{\Δ\τ}}_{AB}={\mathrm{\Δ\τ}}_{AB}^T-{\mathrm{\Δ\τ}}_{AB}^R$

Wherein,For sending the delay inequality of link,For receiving the delay inequality of link.