CN110989327B - Distributed high-precision time frequency real-time integrated system - Google Patents
Distributed high-precision time frequency real-time integrated system Download PDFInfo
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- CN110989327B CN110989327B CN201911370478.2A CN201911370478A CN110989327B CN 110989327 B CN110989327 B CN 110989327B CN 201911370478 A CN201911370478 A CN 201911370478A CN 110989327 B CN110989327 B CN 110989327B
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Abstract
The invention provides a distributed high-precision time frequency real-time comprehensive system which comprises a plurality of high-precision time frequency real-time devices, a communication network and optical fibers, wherein the high-precision time frequency real-time devices are positioned at different geographic positions and comprise atomic clocks, a double-mixing time difference measuring unit, a data communication exchange unit, a processing unit, a control unit, a crystal oscillator unit and a second pulse comparison processing generation unit. The device has the advantages of high accuracy, good stability, high reliability, uniform and consistent time frequency signals in the whole network and the like.
Description
Technical Field
The invention relates to a distributed high-precision time frequency real-time comprehensive system, and belongs to the technical field of time frequency.
Background
The existing high-precision time frequency output device uses the atomic and molecular energy level difference of an atomic clock as a reference signal to calibrate a crystal oscillator so as to output a standard frequency signal. It uses the signal generated by atomic energy level transition, and obtains the negative feedback error-correcting signal for correcting crystal oscillator after photoelectric conversion and signal processing, so that it can output stable oscillation frequency for accurately calculating time.
Because of small deviations in the frequency stability and accuracy of different atomic clocks, such deviations affect the accuracy of the time frequency output.
For the above reasons, the output times of the current time frequency output devices in various places cannot be completely synchronized, and the output times have certain differences.
With the development of science and technology at any time, the application field of high-precision time frequency signals is more and more wide, the time frequency signals with an ultra-large range (nationwide) and accurate consistency are needed, and meanwhile, a plurality of time-keeping atomic clock groups are needed to be distributed in various places to ensure reliability and damage resistance. How to generate a time frequency signal which is uniformly coordinated and consistent in the whole network according to each distributed time-keeping atomic clock group for real-time output application is a very important urgent problem.
Disclosure of Invention
In order to solve the above problems, the present inventors have conducted intensive studies, and have completed the present invention by comparing frequencies of a plurality of atomic clocks in a remote real-time manner, exchanging comparison results, and comprehensively using calculations, thereby controlling a crystal oscillator unit to output a frequency and a second pulse signal that are uniform, more stable, and accurate over the entire network.
In one aspect, the invention provides a distributed high-precision time-frequency real-time integrated system,
the system comprises at least two high-precision time frequency real-time devices, a communication network and an atomic clock signal transmission optical fiber.
The high precision time frequency real time devices are each independently located at different geographical locations,
the communication network is a network device which adopts optical fibers for communication.
The high-precision time frequency real-time device comprises a double-mixing time difference measuring unit, a data communication exchange unit, a processing unit, a control unit, a crystal oscillator unit and a second pulse comparison processing generation unit.
The high-precision time frequency real-time device is connected with an atomic clock (group).
The double-mixing time difference measuring unit receives the atomic clock (group) frequency signals and measures the atomic clock (group) frequency signals, at least two atomic clock (group) frequency signals comprise a local atomic clock (group) frequency signal and at least one remote atomic clock (group) frequency signal,
the off-site atomic clock frequency signal is provided by an atomic clock (group) in a high-precision time-frequency real-time device at other geographical positions,
the double mixing time difference measuring unit measures the frequency signal output of the crystal oscillator unit,
the data communication exchange unit receives the local frequency phase comparison data information which is output by the double mixing time difference measuring unit and contains relative frequency deviation, transmits the local frequency phase comparison data information to a data communication exchange unit in a different-place high-precision time frequency real-time device through a communication network, receives different-place frequency phase comparison data information transmitted by the data communication exchange unit in the different-place high-precision time frequency real-time device, and transmits the local frequency phase comparison data information and the different-place frequency phase comparison data information to the processing unit,
the control unit adjusts the crystal oscillator unit by changing the voltage of the crystal oscillator.
The data communication exchange unit also acquires the pulse per second consistency comparison information generated by the pulse per second comparison processing and generating unit, and exchanges the pulse per second consistency comparison information with the data communication exchange unit of the remote high-precision time frequency real-time device through a communication network.
The processing unit acquires frequency phase comparison data information and allopatric frequency phase comparison data information in the data communication exchange unit, and performs comprehensive processing, including synthesizing local frequency phase comparison data information and allopatric frequency phase comparison data information, to obtain relatively more accurate relative frequency deviation and phase deviation data information.
The comprehensive processing also comprises the step of synthesizing the frequency stability and/or the frequency accuracy of the local atomic clock (group) and the atomic clock (group) at different places to obtain more stable and accurate relative frequency deviation and phase deviation between the local atomic clock (group) and the crystal oscillator.
And the pulse per second comparison processing generation unit generates and outputs consistency information of the external pulse per second signal and the local pulse per second signal.
The pulse per second comparison processing generation unit is used for checking the consistency of a local pulse per second signal and a remote pulse per second signal, obtaining a plurality of coarse synchronization pulse per second signal positions according to pulse per second consistency information acquired by the data communication exchange unit, generating a reference signal of the pulse per second signal, generating a plurality of pulse signals by taking the zero-crossing point position of a frequency signal output by the crystal oscillator unit as the rising edge of the pulse per second, and selecting the pulse signal closest to the reference signal from the pulse signals as the pulse per second signal for output.
On the other hand, the invention provides a distributed high-precision time frequency real-time synthesis method, which comprises the following steps:
s1, acquiring a frequency signal of a local atomic clock (group) and a frequency signal of a remote atomic clock (group);
s2, measuring frequency signals of the crystal oscillator, the local atomic clock (group) and the remote atomic clock (group);
s3, exchanging the measurement result with a different-place high-precision time frequency real-time device through a network;
s4, synthesizing the local measurement result and the remote measurement result to obtain an optimal result;
s5, controlling the crystal oscillator to make the frequency and phase of the sine wave signal output by the crystal oscillator accurate, stable, and unified and consistent in the whole network,
and S6, taking the coarse synchronization pulse-per-second signal as a reference, and taking the zero-crossing point position of the sine wave signal output by the crystal oscillator as the rising edge of the pulse-per-second to generate the pulse-per-second signal which is uniformly coordinated and consistent in the whole network.
The distributed high-precision time-frequency real-time comprehensive system provided by the invention has the following beneficial effects:
(1) the accuracy of real-time output time frequency signals is high;
(2) the real-time output time frequency signal has good stability;
(3) the system reliability is high, the devices are arranged at different positions, and the accuracy and the stability of the time frequency signals of the whole network are basically not influenced when the single device is abnormal;
(4) the output time frequency signals are uniformly coordinated in the whole network.
Drawings
FIG. 1 shows a schematic diagram of a distributed high-precision time-frequency real-time integration system of a preferred embodiment;
fig. 2 shows a schematic diagram of a high-precision time-frequency real-time device according to a preferred embodiment.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention, as illustrated in the accompanying drawings.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
Because the frequency of different atomic clock outputs has little deviation, some atomic clock output frequency's stability is better, and some atomic clock output frequency's the degree of accuracy is better, when synthesizing a plurality of atomic clocks to adopt suitable algorithm, can obtain the output frequency that stability and degree of accuracy are all more excellent, and then revise the crystal oscillator, thereby reach the effect that makes the crystal oscillator output more accurate time frequency signal.
In one aspect, the present invention provides a distributed high-precision time-frequency real-time integrated system, as shown in fig. 1, including at least two high-precision time-frequency real-time devices, a communication network, and an atomic clock signal transmission fiber.
The high precision time frequency real time devices are each independently located at different geographical locations.
The atomic clock signal transmission optical fiber is used for transmitting and exchanging atomic clock frequency signals and pulse per second signals of high-precision time frequency real-time devices in different geographic positions.
The communication network is used for transmitting and exchanging the pulse per second consistency information and the frequency difference information generated by the high-precision time frequency real-time devices in different geographic positions, and can be any equipment capable of being in communication connection, preferably network equipment which adopts optical fibers for communication, so that the information exchange rate is improved.
The high-precision time frequency real-time device comprises a double-mixing time difference measuring unit, a data communication exchange unit, a processing unit, a control unit, a crystal oscillator unit and a second pulse comparison processing generation unit,
the high-precision time-frequency real-time device is connected with an atomic clock (group) as shown in figure 2.
Specifically, the double mixing time difference measuring unit can receive the atomic clock (group) frequency signal and measure the atomic clock (group) frequency signal.
Furthermore, at least two atomic clock (group) frequency signals comprise a local atomic clock (group) frequency signal and at least one off-site atomic clock (group) frequency signal so as to comprehensively obtain more accurate frequency deviation between the crystal oscillation unit and the atomic clock (group),
according to the invention, the frequency signal of the atomic clock (group) in different places is provided by the atomic clock (group) in a high-precision time-frequency real-time device in other geographical positions and is transmitted to a local double-mixing time difference measuring unit through an optical fiber.
The frequency signals of the atomic clock (group) are input into a double-mixing time difference measuring unit in a sine wave form, the double-mixing time difference measuring unit accurately measures a plurality of input frequency signals (sine wave phases) by using a double-mixing time difference measuring technology to obtain the phase difference among a plurality of atomic clock frequency signals, and the ratio of the variation of the phase difference to the measuring time interval is the relative frequency deviation.
When the double mixing time difference measuring unit measures the frequency signals of the atomic clock, one or more frequency points in 1 MHz-200 MHz can be selected for measurement,
according to the invention, the selection of the frequency point during measurement is determined by the performance of a double mixing time difference measuring unit and a crystal oscillator unit, wherein the performance of the double mixing time difference measuring unit refers to the noise coefficient, the performance of the crystal oscillator unit refers to the frequency stability of the crystal oscillator, and specifically:
when the noise coefficient of the double-mixing time difference measuring unit is large, measuring by adopting a low frequency point so as to reduce the influence of the noise of the double-mixing time difference measuring unit on an analysis result as much as possible;
when the noise coefficient of the double-mixing time difference measuring unit is small, a high frequency point is adopted for measurement so as to increase the control frequency of the crystal oscillator and enable the frequency signal output by the crystal oscillator to be more accurate;
when the performance of the crystal oscillator unit is better, the control frequency of the crystal oscillator unit can be properly reduced, namely the measurement frequency of the double-mixing time difference measurement unit can be properly reduced;
when the performance of the crystal oscillator unit is poor, in order to improve the accuracy of the frequency signal output by the crystal oscillator, the measurement frequency of the double-mixing time difference measurement unit is improved to increase the control frequency of the crystal oscillator.
Preferably, one or more frequency points of 5MHz, 10MHz and/or 100MHz are adopted for measurement to determine the phase difference among a plurality of atomic clocks, the frequency points are the output nominal frequency of the atomic clocks at home and abroad, the frequency can be compatible with the existing atomic clock equipment, and the phase difference among the atomic clocks can be determined.
Furthermore, according to the phase deviation between each atomic clock and the controlled crystal oscillator measured by the double mixing time difference measuring unit, the relative frequency deviation between the controlled crystal oscillator and each atomic clock can be determined.
The double mixing time difference measuring unit is also provided with a mixer and an AD chip,
the AD chip is used for converting the measured relative frequency deviation into a digital signal to obtain frequency phase comparison data information and outputting the data information to the data acquisition and storage unit,
further, the relative frequency deviation comprises the relative frequency deviation between the measured multiple atomic clock frequency signals and the relative frequency deviation between the crystal oscillator unit frequency signal and the local atomic clock frequency signal.
The frequency mixer filters the atomic clock frequency signal and the crystal oscillator unit frequency signal from high frequency to low frequency, preferably, the frequency after frequency mixing is 100-10 kHz, so that the data acquisition and storage unit can acquire the signals and convert the signals into digital signals; more preferably 100Hz to 1kHz, so as to reduce the requirement on the acquisition frequency of the AD chip and reduce the manufacturing cost of the device.
The data communication exchange unit receives local frequency phase comparison data information which is output by the double mixing time difference measuring unit and contains relative frequency deviation, transmits the local frequency phase comparison data information to a data communication exchange unit in a different-place high-precision time frequency real-time device through a communication network, receives different-place frequency phase comparison data information transmitted by a data communication exchange unit in the different-place high-precision time frequency real-time device, and transmits the local frequency phase comparison data information and the different-place frequency phase comparison data information to the processing unit.
In the invention, the data communication exchange unit can also acquire the pulse per second consistency information generated by the pulse per second comparison processing generation unit and exchange the pulse per second consistency information with the data communication exchange unit in the long-distance high-precision time frequency real-time device through a communication network.
According to the invention, the processing unit can acquire the frequency phase comparison data information and the allopatric frequency phase comparison data information in the data communication exchange unit and carry out comprehensive processing,
the comprehensive processing comprises comprehensive processing of local frequency phase comparison data information and allopatric frequency phase comparison data information to obtain more accurate digital signals.
Specifically, due to the difference in the performance of the atomic clocks (groups), frequency deviation data information transmitted by the high-precision time-frequency real-time devices in different geographic positions is different to a certain extent, and the processing unit synthesizes the relative frequency deviation data information measured by the high-precision time-frequency real-time devices in different positions to obtain a relatively more accurate and stable frequency signal.
In the invention, the comprehensive processing of the local frequency deviation data information and the remote frequency deviation data information is to weight and average all the frequency deviations.
According to the invention, the comprehensive processing further comprises the step of synthesizing the frequency stability and/or the frequency accuracy of the local atomic clock (group) and the remote atomic clock (group) to obtain more stable and accurate relative frequency deviation and phase deviation between the local atomic clock (group) and the crystal oscillator.
The frequency stability and/or frequency accuracy of the integrated local atomic clock(s) and the remote atomic clock(s) is processed according to the relative frequency deviation historical data and the accuracy weight among the multi-atomic clocks,
specifically, the accuracy weight is obtained according to the accuracy degree of the output signal of each atomic clock, when the deviation of the frequency output by the atomic clock from the nominal value is smaller, the accuracy A is higher,
and is
Wherein n represents the number of atomic clocks, i represents different atomic clocks,
representing the relative weight of the ith atomic clock, derived from the atomic clock nominal, with the atomic clock accuracy weighted by
The stability weight is obtained according to the stability of the output signals of each atomic clock, when the continuous output frequency of the atomic clocks is higher, the stability sigma is higher, and
where n denotes the number of atomic clocks, i denotes different atomic clocks, σiIndicating the stability of the ith atomic clock.
The Allen deviation due to the relative frequency deviation of the atomic clock from the nominal value over the historical time can be defined as the stability σiThe historical time may be 1 hour to 1 month, more preferably 1 day to 10 days, and the weight of the stability of the atomic clock is
In a preferred embodiment, the processing unit integrates the frequency deviations of the plurality of atomic clocks by the following formula:
frequency deviation from accuracy weight
Wherein phiiThe current data of the frequency deviation of the crystal oscillator and the ith atomic clock are shown, n represents the number of the atomic clocks, i represents the ith atomic clock,
frequency deviation derived from stability weights
Wherein phiiThe current data is the frequency deviation current data of the crystal oscillator and the ith atomic clock, n represents the number of the atomic clocks, i represents the ith atomic clock, the current data is the data of the time interval from the last adjustment of the crystal oscillator to the current adjustment, and the time interval is preferably 1-100 seconds.
Further, the frequency deviation psi obtained by integrating the frequency stability weights of the multiple atomic clocksσFrequency deviation psi from frequency accuracy weights of multiple atomic clocksAA more stable, accurate frequency deviation can be derived: preferably, the final frequency deviation is obtained by the following formula:
ΨZ＝αΨA+(1-α)Ψσwhere 0 ≦ α ≦ 1, α represents the clock accuracy ratio, and the frequency deviation ΨZUsed as the increment of the crystal oscillator control voltage, by adjusting the crystal oscillator control voltage, psi is enabledZAs much as 0 as possible.
In a preferred embodiment, in order to ensure the adjustment accuracy, in the actual control, the frequency difference tracking control of the crystal oscillator is converted into the phase tracking control, and the phase alignment condition of the sine wave signal output by the crystal oscillator in each device is considered, so that the phase of the sine wave signal output by the crystal oscillator is uniformly coordinated in a whole network. The adjustment method is within the ability of those skilled in the art, and the specific adjustment method can be selected by those skilled in the art according to actual needs, which is not described herein.
In general, α is 0.5, so that the final frequency deviation can equivalently balance both the stability and the accuracy.
In another preferred embodiment, the value of α is adjusted according to the specific application and the relative proportion of accuracy and stability according to the actual requirement.
In the present invention, the control unit is able to obtain Ψ in the processing unitZAnd the relative frequency deviation value of the crystal oscillator unit, and the crystal oscillator unit is adjusted according to the value so as to correct the frequency signal output by the crystal oscillator, so that the frequency signal is more stable and accurate.
In the invention, the control unit can adjust the crystal oscillator unit by changing the crystal oscillator voltage.
Specifically, the control unit is provided with a DA module, the output end of the DA module is connected to the voltage-controlled voltage control end of the crystal oscillator, and the control unit adjusts the output voltage of the DA module according to the relative frequency deviation value acquired from the processing unit, so that the final frequency deviation ΨZAnd 0 is obtained as much as possible, so that the adjustment of the output frequency of the crystal oscillator unit is completed.
The second pulse comparison processing generation unit acquires the frequency signal output by the crystal oscillator unit and can generate and output a second pulse signal, the output second pulse signal is transmitted to the second pulse comparison processing generation unit in the high-precision time frequency real-time device at other geographical positions through an optical fiber,
furthermore, the pulse-per-second comparison processing generation unit can also perform consistency check on the locally generated pulse-per-second signal and the remotely obtained pulse-per-second signal through the optical fiber, that is, the pulse-per-second signal is compared with the deviation of the rising edge position of each pulse-per-second signal, and the pulse-per-second signal is considered to be consistent when the deviation does not exceed 2.5ns and is considered to be inconsistent when the deviation exceeds 2.5 ns.
Furthermore, the pulse per second comparison processing generation unit can transmit the consistency check result to the data communication exchange unit, and the data communication exchange unit exchanges data with a high-precision time frequency real-time device in other places,
the pulse per second comparison processing generation unit obtains the position of a coarse synchronization pulse per second signal according to the pulse per second consistency check result obtained by the data communication exchange unit, so as to generate a reference signal of the pulse per second signal, when the pulse per second signals are consistent, the reference signal of the pulse per second is easily obtained, when the pulse per second signals are inconsistent, the adjustment is performed according to the principle of few obedients to majority, for example, the first two of the three pulse per second signals are consistent, the third pulse per second signal is inconsistent with the first two pulse per second signals, the first two consistent pulse per second signals are used as the reference signal, and the pulse per second of the third device is adjusted until the pulse per second of the three devices is consistent.
The second pulse comparison processing generation unit can generate a plurality of pulse signals by using the zero crossing point position of the frequency signal output by the crystal oscillator unit as the rising edge of the second pulse,
further, the pulse-per-second comparison processing generation unit may be further configured to select one closest to the reference signal from the generated plurality of pulse signals as a pulse-per-second output signal. The signal can be output through an optical fiber and used as a comparison signal for the consistency check of a second pulse comparison processing generation unit in a long-distance high-precision time frequency real-time device.
On the other hand, the invention also provides a distributed high-precision time frequency real-time synthesis method, which comprises the following steps:
s1, acquiring a frequency signal of a local atomic clock and a frequency signal of a remote atomic clock;
s2, measuring frequency signals of the crystal oscillator, the local atomic clock (group) and the remote atomic clock (group);
s3, exchanging the measurement result with a different-place high-precision time frequency real-time device through a network;
s4, synthesizing the local measurement result and the remote measurement result to obtain an optimal result;
s5, controlling the crystal oscillator to ensure that the frequency and the phase of the sine wave signal output by the crystal oscillator are accurate and stable and are uniformly coordinated in the whole network; and S6, taking the coarse synchronization pulse-per-second signal as a reference, and taking the zero-crossing point position of the sine wave signal output by the crystal oscillator as the rising edge of the pulse-per-second to generate the pulse-per-second signal which is uniformly coordinated and consistent in the whole network.
In step S2, the method further includes the following substeps:
s21, measuring the frequency of a plurality of atomic clocks to obtain the phase difference between the frequency signals of the atomic clocks;
specifically, a double mixing time difference measurement technology is adopted for measurement.
Preferably, one or more frequency points of 1 MHz-200 MHz are selected for measurement, and more preferably one or more frequency points of 5MHz, 10MHz and/or 100MHz are selected for measurement.
And S22, measuring the frequency signal of the crystal oscillator, and comparing the frequency signal with the frequencies of a plurality of atomic clocks to obtain the relative frequency deviation.
In a preferred embodiment, in steps S21 and S22, the atomic clock frequency signal and the crystal oscillator unit frequency signal are mixed and filtered from a high frequency to a low frequency for easy acquisition and storage.
In step S4, the measurement result collected and stored in step S2 and the measurement result obtained in step S3 are calculated, an accurate and stable frequency is obtained by integration, and the frequency is compared with the crystal oscillator output frequency to obtain a relative frequency deviation.
Preferably, the method comprises the following steps:
s41, determining the optimal relative frequency deviation data signal
S42, determining the accuracy and/or stability weight of a plurality of atomic clock signals;
and S43, synthesizing to obtain the optimal frequency according to the accuracy and/or stability weight and the relative frequency deviation.
And S44, comparing the optimal frequency with the output frequency of the crystal oscillator to obtain the relative frequency deviation.
In step S6, the method includes the steps of:
s61, carrying out consistency check on the remote pulse-per-second signal and the local pulse-per-second signal;
s62, acquiring the pulse per second consistency of the high-precision time frequency real-time device at different positions through a network;
s63, determining the position of the coarse synchronization pulse-per-second signal, and generating a reference signal of the pulse-per-second signal;
s64, generating a plurality of pulse-per-second signals by using the zero crossing point of the frequency signal output by the crystal oscillator unit as the rising edge of the pulse-per-second;
s65, selecting one of the plurality of pulse-per-second signals that is closest to the reference signal as an output signal.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on operational states of the present invention, and are only used for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. A distributed high-precision time-frequency real-time integrated system is characterized by comprising at least two high-precision time-frequency real-time devices, a communication network and atomic clock signal transmission optical fibers;
the high-precision time frequency real-time device comprises a double-mixing time difference measuring unit, a data communication exchange unit, a processing unit, a control unit, a crystal oscillator unit and a second pulse comparison processing generation unit,
the high-precision time frequency real-time device is connected with an atomic clock (group);
the double-mixing time difference measuring unit receives the atomic clock (group) frequency signals and measures the atomic clock (group) frequency signals, at least two atomic clock (group) frequency signals comprise a local atomic clock (group) frequency signal and at least one remote atomic clock (group) frequency signal,
the off-site atomic clock frequency signal is provided by an atomic clock (group) in a high-precision time-frequency real-time device at other geographical positions,
the double mixing time difference measuring unit measures the frequency signal output of the crystal oscillator unit,
the data communication exchange unit receives the local frequency phase comparison data information which is output by the double mixing time difference measuring unit and contains relative frequency deviation, transmits the local frequency phase comparison data information to a data communication exchange unit in a different-place high-precision time frequency real-time device through a communication network, receives different-place frequency phase comparison data information transmitted by the data communication exchange unit in the different-place high-precision time frequency real-time device, and transmits the local frequency phase comparison data information and the different-place frequency phase comparison data information to the processing unit,
the control unit adjusts the frequency phase of the crystal oscillator unit by changing the voltage of the crystal oscillator.
2. The distributed high-precision time-frequency real-time integration system of claim 1,
the high precision time frequency real time devices are each independently located at different geographical locations,
the communication network is a network device which adopts optical fibers for communication.
3. The distributed high-precision time-frequency real-time integration system of claim 1,
the data communication exchange unit also acquires the pulse per second consistency comparison information generated by the pulse per second comparison processing and generating unit, and exchanges the pulse per second consistency comparison information with the data communication exchange unit of the remote high-precision time frequency real-time device through a communication network.
4. The distributed high-precision time-frequency real-time integration system of claim 1,
the processing unit acquires frequency phase comparison data information and allopatric frequency phase comparison data information in the data communication exchange unit, and performs comprehensive processing, including synthesizing local frequency phase comparison data information and allopatric frequency phase comparison data information, to obtain relatively more accurate relative frequency deviation and phase deviation data information.
5. The distributed high precision time-frequency real time integration system of claim 4,
the comprehensive processing also comprises the step of synthesizing the frequency stability and/or the frequency accuracy of the local atomic clock (group) and the atomic clock (group) at different places to obtain more stable and accurate relative frequency deviation and phase deviation between the local atomic clock (group) and the crystal oscillator.
6. The distributed high-precision time-frequency real-time integration system of claim 1,
and the pulse per second comparison processing generation unit generates and outputs consistency information of the external pulse per second signal and the local pulse per second signal.
7. The distributed high-precision time-frequency real-time integration system of claim 1,
the pulse per second comparison processing generation unit is used for checking the consistency of a local pulse per second signal and a remote pulse per second signal, obtaining a plurality of coarse synchronization pulse per second signal positions according to pulse per second consistency information acquired by the data communication exchange unit, generating a reference signal of the pulse per second signal, generating a plurality of pulse signals by taking the zero-crossing point position of a frequency signal output by the crystal oscillator unit as the rising edge of the pulse per second, and selecting the pulse signal closest to the reference signal from the pulse signals as the pulse per second signal for output.
8. A method for distributed high-precision time-frequency real-time synthesis, which is implemented by using the distributed high-precision time-frequency real-time synthesis system as claimed in any one of claims 1 to 7, and comprises the following steps:
s1, acquiring a frequency signal of a local atomic clock (group) and a frequency signal of a remote atomic clock (group);
s2, measuring frequency signals of the crystal oscillator, the local atomic clock (group) and the remote atomic clock (group);
s3, exchanging the measurement result with a different-place high-precision time frequency real-time device through a network;
s4, synthesizing the local measurement result and the remote measurement result to obtain an optimal result;
s5, controlling the crystal oscillator to make the frequency and phase of the sine wave signal output by the crystal oscillator accurate, stable, and unified and consistent in the whole network,
and S6, taking the coarse synchronization pulse-per-second signal as a reference, and taking the zero-crossing point position of the sine wave signal output by the crystal oscillator as the rising edge of the pulse-per-second to generate the pulse-per-second signal which is uniformly coordinated and consistent in the whole network.
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