CN117270374A

CN117270374A - Common view data generation method, time consumption terminal and time calibration system

Info

Publication number: CN117270374A
Application number: CN202311244222.3A
Authority: CN
Inventors: 王玉琢; 张爱敏; 高源�; 杨志强; 贾正森
Original assignee: National Institute of Metrology
Current assignee: National Institute of Metrology
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2023-12-22
Also published as: CN113110016B; CN117148701A; CN117270375A; CN117289590A; CN117270376A; CN113110016A

Abstract

The invention discloses a common view data generation method, a time consumption terminal and a time calibration system, wherein the common view data generation method comprises the following steps: receiving satellite measurement data; acquiring a local time-frequency measurement signal, wherein the local time-frequency measurement signal comprises a time-frequency measurement signal during local coordination or a time-frequency measurement signal during comprehensive atomic time; and calculating time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal, sending the common view data to a time keeping unit as common view data, receiving corrected time deviation data and/or frequency deviation data sent by the time keeping unit, and calibrating the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data. The common view data generation method, the time consumption terminal and the time calibration system disclosed by the embodiment of the invention can improve the accuracy of time calibration.

Description

Common view data generation method, time consumption terminal and time calibration system

The invention is a divisional application with the application number 202110389864.7 and the invention name of common view data generation method, receiver and time calibration system.

Technical Field

The embodiment of the invention relates to a time calibration technology, in particular to a common view data generation method, a time-consuming terminal and a time calibration system.

Background

Along with the development of scientific technology, the importance of high-precision time frequency in national economy development is prominent. The precise time has wide application in various aspects of national defense modernization and national economy construction. In many scientific research fields, such as metering, calibration, event time stamping, etc., high precision time references are required. Precise timing, modern communication, navigation positioning, computer automatic control, and the like are all separated from precise time scale and time frequency measurement techniques, see patent document 1 (US 5757916), similarly, patent document 2 (CN 101014874A), patent document 3 (CN 101843010 a), patent document 4 (CN 103283288 a), and the like. The atomic time scale is the core of a time-frequency system, realizes international tracing on the upper part and realizes magnitude transmission on the lower part. The time scale is a key of the time frequency system, and plays a role in the time frequency system.

The universal time used internationally is coordinated universal time (Universal Time Coordinated, UTC) which is obtained from international atomic time (International Atomic Time, TAI) plus leap seconds. TAI is the result of the worldwide time-frequency laboratory collaboration, with 400 atomic clock data distributed over 50 or more laboratories being weighted averaged and then handled by a reference clock. The international metering office (International Bureau of Weights and Measures, BIPM) is responsible for the management and release of TAI and UTC, and typically releases a time publication after 30 to 45 days, including the time difference between UTC and each laboratory, and the time difference between UTC and each atomic clock involved in TAI calculation.

The time keeping unit generally comprises atomic clocks, internal measurement, tracing comparison, time scale generation, time transmission and the like, wherein a clock group formed by a plurality of atomic clocks performs joint time keeping and generates a local atomic time scale (comprehensive atomic time TA (k), wherein k is used for representing the code number of each time keeping unit), the time keeping unit has better stability and robustness, TA (k) is generated after weighted average of atomic clock data, generally lags behind by more than 1 day, and UTC and TA (k) are jointly driven to generate the local coordinated time UTC (k) through a time transmission system.

In order to improve the accuracy of UTC (k) in local coordination of each timekeeping unit, satellite co-vision is proposed for time calibration. Satellite co-vision is a method of time alignment between two remote clocks or two local universal time sets. Common view means that two places can see the same satellite at the same time, and the time difference between the local clock and the received satellite is measured at the same time, and then data are exchanged to obtain the time difference of the two places. Non-patent document 1 (Wang Liping, xu Liang, based on the principle of time-frequency remote calibration by satellite co-vision, shanghai metering test, 2019.3, 274) describes a conventional time-frequency standard for achieving high accuracy by satellite and a transmission comparison and synchronization method therefor. However, based on satellite co-view, currently, the local standard time and frequency of the existing user generally trace to UTC (k)/BDS/GPS first, and then indirectly trace to UTC.

The user tracing to UTC (k) generally adopts global navigation satellite system (Global Navigation Satellite System, GNSS) co-view technology (GNSS co-view method), and specifically can be seen in non-patent document 2 (Chen Ruiqiong, UTC (NTSC) remote reproduction method research and engineering implementation (D), university of chinese academy of sciences) and patent document 5 (US 2018/0011199 A1). Other satellite systems, beidou satellites in china, may also be used, see in particular patent document 6 (CN 201811252379, beidou RDSS-based co-view data transfer and time synchronization methods and systems). Taking into consideration the time delay and error of a single satellite signal, the common algorithm calculates the average value of time differences by using a plurality of satellite signals, and in this way, the time-frequency comparison accuracy is improved, so that the UTC (k) is traced back, and in particular, patent document 7 (WO 02/061449 A1) is referred to. However, since UTC (k)/BDS/GPS is subject to human intervention/adjustment, its frequency characteristics and predictability will be degraded. And therefore will affect the accuracy of the satellite co-view for time alignment.

Other prior art relating to the above-mentioned art, including but not limited to the following patent or non-patent documents, are incorporated by reference.

High-precision time frequency source for real-time domestication to time frequency standard, CN103226324B

Time-frequency transmission data acquisition processing system based on global navigation satellite system, CN102590836B frequency standard remote calibration method and system thereof, CN101692163B

Virtual atomic clock system for monitoring entity atomic clock and working method thereof, CN110837219A

Time-frequency transfer method and receiver based on fusion of multiple GNSS systems, CN102004258B

High precision time frequency source based on fiber optic time transfer, CN106506106B

Optical fiber unidirectional time frequency transmission system and method, CN106571874B

Enhanced stability for local atomic clock ensemble time scale using weighted moving average filter,doi:10.1109/ICMA.2016.7558864

Agenerating procedure for local atomic clock ensemble time scale,doi:10.1109/IAEAC.2017.8054040

Enhanced predictability of hydrogen maser using random pursuit strategy,doi:10.1109/FCS.2017.8089011

Time transfer via different GNSS systems,doi:10.23919/URSIAP-RASC.2019.8738763.

Further results of time transfer through the optical fiber at NIM,doi:10.1109/FCS.2017.8089010

Disciplined oscillator system by UTC(NIM)for remote time and frequency traceability,doi:10.1109/EFTF.2014.7331537

New timekeeping system and its time link calibration at NIM,doi:10.1109/FCS.2014.6859896

Research on modification of H-maser drift,doi:10.1109/FCS.2014.6859953

Disclosure of Invention

The invention provides a common view data generation method, a time consumption terminal and a time calibration system, which can improve the accuracy of time calibration.

In a first aspect, an embodiment of the present invention provides a method for generating common view data, including:

receiving satellite measurement data;

acquiring a local time-frequency measurement signal, wherein the local time-frequency measurement signal comprises a time-frequency measurement signal during local coordination or a time-frequency measurement signal during comprehensive atomic time;

calculating time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal as common view data;

and transmitting the common view data to a time keeping unit, receiving the corrected time deviation data and/or frequency deviation data transmitted by the time keeping unit, and calibrating the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data.

In a possible implementation manner of the first aspect, the calculating time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal includes:

calculating frequency deviation data of the satellite measurement data and the local time-frequency measurement signal;

the receiving the corrected time deviation data and/or frequency deviation data sent by the time keeping unit, and calibrating the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data, including:

and receiving the corrected frequency deviation data transmitted by the time keeping unit, carrying out frequency calibration on the local time-frequency signal according to the corrected frequency deviation data, and carrying out time calibration on the local time-frequency signal according to the satellite measurement data.

In a second aspect, an embodiment of the present invention provides a time-consuming terminal, which is characterized by comprising a receiver and a terminal node;

the receiver is used for receiving satellite measurement data; acquiring a local time-frequency measurement signal, wherein the local time-frequency measurement signal comprises a time-frequency measurement signal during local coordination or a time-frequency measurement signal during comprehensive atomic time; calculating time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal as common view data;

The terminal node is used for transmitting the common view data calculated by the receiver to the time keeping unit, receiving the corrected time deviation data and/or frequency deviation data transmitted by the time keeping unit, and calibrating the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data.

In a possible implementation manner of the second aspect, the receiver is specifically configured to calculate frequency deviation data of the satellite measurement data and the local time-frequency measurement signal;

the terminal node is specifically configured to receive corrected frequency deviation data sent by a time keeping unit, perform frequency calibration on a local time-frequency signal according to the corrected frequency deviation data, and perform time calibration on the local time-frequency signal according to the satellite measurement data.

In a third aspect, an embodiment of the present invention provides a time calibration system, including: at least one time consuming terminal and at least one time keeping unit as described in any one of the implementations of the second aspect;

the at least one time keeping unit acquires a local time-frequency measurement signal, wherein the local time-frequency measurement signal comprises a time-frequency measurement signal during local coordination or a time-frequency measurement signal during comprehensive atomic time; calculating corrected time deviation data and/or frequency deviation data according to the common view data sent by the time-consuming terminal and the local time-frequency measurement signal; and transmitting the corrected time deviation data and/or frequency deviation data to the time-consuming terminal.

In a fourth aspect, an embodiment of the present invention provides a method for generating a timestamp, including: the time-consuming terminal performs time and/or frequency calibration by receiving common-view data sent by a time keeping unit through a protocol, wherein the time-consuming terminal comprises the time-consuming terminal according to any implementation manner of the second aspect;

and giving time to the time stamp server according to the calibrated time-frequency signal, and stamping a time stamp.

In a fifth aspect, an embodiment of the present invention provides a data mining method, which is characterized in that the method includes: the time-consuming terminal performs time and/or frequency calibration by receiving common-view data sent by a time keeping unit through a protocol, wherein the time-consuming terminal comprises the time-consuming terminal according to any implementation manner of the second aspect;

and timing a plurality of data mining servers according to the calibrated time-frequency signals, so that the plurality of data mining servers finish accurate sequencing and/or screening of data according to the calibrated time-frequency signals.

According to the common view data generation method, the time consumption terminal and the time calibration system, according to time deviation and/or frequency deviation data of satellite measurement data and local time-frequency measurement data, the local time-frequency measurement signals comprise time-frequency measurement signals in local coordination or time-frequency measurement signals in atomic synthesis, the common view data are sent to a time keeping unit, corrected time deviation data and/or frequency deviation data sent by the time keeping unit are received, and the local time-frequency signals are calibrated according to the corrected time deviation data and/or frequency deviation data, so that the accuracy of time calibration is improved.

Drawings

FIG. 1 is a flowchart of a method for generating common view data according to an embodiment of the present invention;

FIG. 2 is a flow chart of generating common view data from satellite measurement data and time-frequency measurement signals of a local time-keeping structure;

FIG. 3 is a flow chart for generating common view data from satellite measurement data and time-frequency measurement signals when integrating atoms;

FIG. 4 is a flow chart for generating common view data from satellite measurement data and time-frequency measurement signals at the time of atomic and local coordination;

fig. 5 is a schematic structural diagram of a receiver according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an input/output structure of a receiver according to an embodiment of the present invention;

fig. 7 is a schematic logic structure diagram of a receiver according to an embodiment of the present invention;

fig. 8 is a schematic diagram of an input/output structure of another receiver according to an embodiment of the present invention;

fig. 9 is a schematic diagram of an input/output structure of another receiver according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a logic structure of another receiver according to an embodiment of the present invention;

FIG. 11 is a flowchart of a time calibration method based on common view data according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a time calibration system based on common view data according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of another time alignment system based on common view data according to an embodiment of the present invention;

fig. 14 is an application schematic diagram of a timestamp generation method according to an embodiment of the present invention;

fig. 15 is an application schematic diagram of a data mining method according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

International atomic Time (TAI) is the result of the cooperation of the worldwide time frequency laboratory, and the addition of leap seconds to TAI yields the internationally used universal time, coordinated Universal Time (UTC). TAI is generated from 400 atomic clock data distributed over 50 laboratories around the world, weighted-averaged, and then handled by a reference clock. The international metering office (BIPM) is responsible for the management and release of TAI and UTC, and typically releases a time publication after 30 to 45 days, including the time difference between UTC and each laboratory, and the time difference between UTC and each atomic clock involved in TAI calculation. Institutions involved in TAI may be referred to as timekeeping units, including, for example, the national institute of metrology (National Institute of Metrology, NIM), the national center of time service of the chinese sciences (national Time Service Cnter, NTSC), the institute of radio metering and testing technology (Beijing Radio Institute of Metrology, BIRM), and the like. Each timekeeping unit generates a local coordinated time UTC (k), such as UTC (NIM), UTC (NTSC), UTC (BIRM), etc., respectively.

The time keeping unit generally comprises atomic clocks, internal measurement, tracing comparison, time scale generation, time transmission and the like, wherein a clock group formed by a plurality of atomic clocks performs joint time keeping and generates a local atomic time scale (comprehensive atomic time TA (k)), so that the time keeping unit has better stability and robustness, TA (k) is also generated by weighted average of atomic clock data, generally lags behind the atomic clock data by more than 1 day, and UTC and TA (k) are jointly driven to generate UTC (k) through a time transmission system.

In order to realize accurate time service, a satellite common view method is currently proposed, and the time of a used terminal can be corrected. However, based on satellite co-view, currently, the local standard time and frequency of existing users is generally traced back to UTC (k) or satellite data (e.g., beidou satellite navigation system (BeiDou Navigation Satellite System, BDS) data or global positioning system (Global Positioning System, GPS) data). k is the code number of each time keeping unit, and then indirectly tracing to UTC. In consideration of time delay and error of a single satellite signal, the satellite co-algorithm calculates an average value of time differences by adopting a plurality of satellite signals, so that the time-frequency comparison precision is improved, and the tracking is carried out to UTC (k). However, since UTC (k) or satellite data is artificially interfered/adjusted, frequency characteristics and predictability thereof are degraded, and thus timing accuracy is affected.

Fig. 1 is a flowchart of a method for generating common view data according to an embodiment of the present invention, where, as shown in fig. 1, the method for generating common view data according to the embodiment includes:

step S101, satellite measurement data is received.

The common view data generation method provided by the embodiment is applied to a receiver which adopts a satellite common view method to perform time calibration. First, with the satellite co-view method, satellite measurement data, that is, time data transmitted by satellites, needs to be received. The satellite measurement data may be measurement data received from a global navigation satellite system (Global Navigation Satellite System, GNSS), among others. The current various GNSS provide time information, such as BDS, GPS, etc., and the receiver meeting the requirements of each GNSS can receive the satellite measurement data sent by each GNSS. However, in this embodiment, satellite measurement data may also be received from other types of satellites. The satellite measurement data may be received from one satellite or from a plurality of satellites. If the satellite measurement data is received from a plurality of satellites, the satellite measurement data received from the plurality of satellites may be processed to eliminate the deviation of each satellite measurement data and obtain corrected satellite measurement data.

Specifically, receiving satellite measurement data includes receiving satellite signals through an antenna, amplifying and converting the signals to form intermediate frequency signals, and then capturing, tracking, demodulating, resolving and measuring the intermediate frequency signals to obtain navigation messages.

Step S102, a local time-frequency measurement signal is acquired.

Then, based on satellite co-vision, local time-frequency measurement signals need to be acquired. The local time-frequency measurement signal is a time-frequency measurement signal of a clock signal of time information provided locally by the receiver. The time-frequency measurement signal may be of a local timekeeping structure of the receiver.

According to the deployment position of the receiver, acquiring the local time-frequency measurement signal may include acquiring at least one of a time-frequency measurement signal of a local time-keeping structure, a time-frequency measurement signal of a local coordination time UTC (k), a time-frequency measurement signal of a comprehensive atomic time TA (k), and a virtual time-frequency measurement signal provided by a mirror atomic clock, wherein k represents a code number of a time-keeping unit.

It should be noted that the execution order of the steps S101 and S102 is not limited to this, and the steps S101 and S102 may be executed simultaneously or in any order.

Step S103, calculating time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal as the common view data.

And finally, calculating time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal, and taking the time deviation data and/or the frequency deviation data as common view data. The common view data may include only time deviation data of the satellite measurement data and the local time-frequency measurement signal, may include only frequency deviation data of the satellite measurement data and the local time-frequency measurement signal, and may include both time deviation data and frequency deviation data of the satellite measurement data and the local time-frequency measurement signal. The generated common view data is used to calibrate the time offset and/or frequency offset of the clock.

And obtaining the time deviation between the local time keeping structure and the satellite and the ionosphere delay correction value, further carrying out delay correction on the time deviation, and finally obtaining the common-view data after filtering.

The receiver for generating the common view data can be located at the time-consuming terminal or at the time-keeping unit, the time-consuming terminal and the time-keeping unit can respectively generate the common view data according to the method, and then the time-keeping unit can correct the common view data generated by the time-consuming terminal according to the common view data generated by the time-consuming terminal, so that the local clock of the time-consuming terminal is corrected.

When the acquired time-frequency measurement signal is the time-frequency measurement signal of the local time-keeping structure, calculating time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency measurement signal of the local time-keeping structure to obtain common-view data. When the acquired time-frequency measurement signal is the time-frequency measurement signal in local coordination, calculating time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency measurement signal in local coordination to obtain common-view data. When the acquired time-frequency measurement signal is the time-frequency measurement signal of the comprehensive atomic time, calculating time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency measurement signal of the comprehensive atomic time to obtain the common-view data. Or the common view data is a combination of any of the time offset data and/or frequency offset data described above.

If the obtained local time-frequency measurement signal is a time-frequency measurement signal of a local time-keeping structure, the obtained local time-frequency measurement signal can be a second pulse and frequency signal of the local time-keeping structure. If the acquired local time-frequency measurement signal is a time-frequency measurement signal at the time of local coordination, the acquired local time-frequency measurement signal may be a second pulse and a frequency signal at the time of receiving the local coordination. If the acquired local time-frequency measurement signal is the time-frequency measurement signal when the atoms are synthesized, the local time-frequency measurement signal can be a second pulse and a frequency signal when the atoms are synthesized.

In addition, the locally coordinated time and the integrated atomic time are provided by a clock set comprising at least one optical clock and/or at least one fountain clock.

Preferably, the generated common view data includes time bias data and/or frequency bias data of the satellite measurement data and the integrated atomic time.

Preferably, the generated common view data includes time deviation data and/or frequency deviation data of the satellite measurement data and the comprehensive atomic time, and also includes time deviation data and/or frequency deviation data of the satellite measurement data and the local coordination.

Preferably, the generated common view data includes time deviation data and/or frequency deviation data of the satellite measurement data and the synthetic atoms, and the other common view data includes time deviation data and/or frequency deviation data of the satellite measurement data and the local coordination.

Preferably, the generated common view data comprises time deviation data and/or frequency deviation data of satellite measurement data and comprehensive atomic time, and the other common view data comprises time deviation data and/or frequency deviation data of satellite measurement data and a local time keeping structure of the time-consuming terminal.

According to the common view data generation method, common view data is obtained according to time deviation and/or frequency deviation data of satellite measurement data and local time-frequency measurement data, and time calibration is carried out by adopting the common view data, so that the accuracy of time calibration is improved. Particularly, when the local time-frequency data is a time-frequency measurement signal when the atoms are synthesized, the predictability of the frequency characteristic is reduced due to the fact that the local coordination is considered to be interfered and adjusted, and the stability and the accuracy of time calibration by using a satellite common-view method are improved by calculating the common-view data when the atoms are synthesized, so that the time deviation of the time of the calibration relative to the coordination world time is reduced.

Fig. 2 to fig. 4 are specific process flowcharts of a method for generating common view data according to an embodiment of the present invention, where fig. 2 is a flowchart for generating common view data according to satellite measurement data and a time-frequency measurement signal of a local time-keeping structure, fig. 3 is a flowchart for generating common view data according to satellite measurement data and a time-frequency measurement signal of a comprehensive atomic time, and fig. 4 is a flowchart for generating common view data according to satellite measurement data and a time-frequency measurement signal of a comprehensive atomic time and a local coordination time.

The processing flow shown in fig. 2 is that a receiver is connected with a second pulse and a frequency signal of a local time keeping structure, satellite signals are received through an antenna, the signals are amplified and converted into intermediate frequency signals, then capturing, tracking, demodulating, resolving and measuring are carried out, a navigation message, the time deviation between the local time keeping structure and the satellite and an ionosphere delay correction value are obtained, the time deviation is further subjected to delay correction, and finally the common view data are obtained after filtering.

The processing flow shown in fig. 3 is based on fig. 2, the second pulse and the frequency signal of the comprehensive atomic time are connected to the receiver, the receiver receives satellite signals through the antenna, and the common view data of the comprehensive atomic time are output.

The processing flow shown in fig. 4 is based on fig. 2, the second pulse and the frequency signal of the comprehensive atomic time and the local coordination time are connected into the receiver, the receiver receives satellite signals through the antenna, and the common view data of the comprehensive atomic time and the local coordination time are output.

Fig. 5 is a schematic structural diagram of a receiver according to an embodiment of the present invention, and as shown in fig. 5, the receiver provided in this embodiment includes:

a satellite signal receiving unit 51 for receiving satellite measurement data; a local signal acquisition unit 52, configured to acquire a local time-frequency measurement signal; the common view data generating module 53 is configured to calculate time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal as common view data.

The receiver provided in this embodiment is configured to execute the method for generating co-view data shown in fig. 1, and its implementation principle and technical effect are euthanized, which will not be described herein.

Further, the local signal obtaining module 52 is specifically configured to obtain at least one of a time-frequency measurement signal of a local time-keeping structure, a time-frequency measurement signal of local coordination, a time-frequency measurement signal of a comprehensive atomic time, and a virtual time-frequency measurement signal provided by a mirror atomic clock. The virtual time-frequency measurement signal provided by the mirror atomic clock can be at least one of a time-frequency measurement signal of a virtual local time-keeping structure, a time-frequency measurement signal of local coordination time, a time-frequency measurement signal of comprehensive atomic time or any combination of the time-frequency measurement signal and the time-frequency measurement signal.

The common view data generating module 53 is specifically configured to calculate at least one of time deviation data and/or frequency deviation data of a time-frequency measurement signal of a local time keeping structure, time deviation data and/or frequency deviation data of a time-frequency measurement signal when the satellite measurement data and the local coordinate, and time deviation data and/or frequency deviation data of a time-frequency measurement signal when the satellite measurement data and the integrated atomic time as the common view data.

Further, the time-frequency measurement signal of the local time-keeping structure comprises: the frequency and/or second pulse of the local timekeeping structure; a time-frequency measurement signal at local coordination comprising: frequency and/or pulse per second at local coordination; synthesizing a time-frequency measurement signal at atomic time, comprising: the frequency and/or pulses per second at which the atoms are synthesized.

Further, the local coordination time and the comprehensive atomic time are provided by a clock set comprising at least one light clock and/or at least one fountain clock.

Fig. 6 is a schematic diagram of an input/output structure of a receiver according to an embodiment of the present invention, where, as shown in fig. 6, the receiver receives satellite measurement data through an antenna and receives a local time-frequency measurement signal, and the local time-frequency measurement signal includes a second pulse and/or a frequency. Wherein the pulses per second and/or frequency include the frequency and/or pulses per second of the local daemon, the frequency and/or pulses per second of the local coordination, the frequency and/or pulses per second of the synthesis of atoms.

Fig. 7 is a schematic logic structure diagram of a receiver according to an embodiment of the present invention, where, as shown in fig. 7, the receiver includes a reference input unit, a capturing and tracking resolving unit, an amplifying frequency conversion unit, a common view data processing unit, and a data input/output unit.

Wherein the reference input unit is used for accessing a local time-frequency measurement signal (which can be provided by local coordination time, comprehensive atomic time and local time keeping structure) to the receiver and providing the input time-frequency signal to the acquisition tracking calculation unit.

The amplifying and frequency converting unit is used for amplifying and frequency converting the radio satellite signals received by the antenna to generate intermediate frequency signals and providing the intermediate frequency signals to the capturing and tracking resolving unit.

The capturing, tracking and resolving unit captures, tracks, resolves and measures the intermediate frequency signal output by the amplifying and frequency converting unit based on the time frequency signal provided by the reference input unit, so as to obtain the time deviation and/or frequency deviation of the local time frequency measuring signal and satellite measuring data, and the time deviation and/or frequency deviation is handed over to the common view data processing unit.

And the common view data processing unit encapsulates and sorts the time deviation and/or frequency deviation data provided by the capturing and tracking resolving unit to form common view data, and submits the common view data to the data input and output unit.

The data input/output unit transmits the common view data through the network, and can also receive a control signal of the receiver on the network, so that the simple configuration of the receiver is realized.

Fig. 8 is a schematic diagram of an input/output structure of another receiver according to an embodiment of the present invention, where, as shown in fig. 8, the receiver can calculate a time offset and/or a frequency offset between a measurement satellite and a synthetic atom.

Fig. 9 is a schematic diagram of an input/output structure of another receiver according to an embodiment of the present invention, where, as shown in fig. 9, the receiver is capable of calculating a time offset and/or a frequency offset when a measurement satellite coordinates locally.

Fig. 10 is a schematic logic structure diagram of another receiver provided in an embodiment of the present invention, as shown in fig. 10, the second pulse and the frequency signal at the time of atomic time synthesis and the time frequency signal at the time of local coordination are provided as local time-frequency measurement signals to the receiver, two different reference input units inside the receiver are provided to two capture tracking resolving units respectively, meanwhile, the amplification frequency conversion unit amplifies and converts the radio satellite signal received by the antenna to generate an intermediate frequency signal and provides the intermediate frequency signal to the two capture tracking resolving units, and finally the two capture tracking resolving units capture, track, resolve and measure the intermediate frequency signal output by the amplification frequency conversion unit based on the time-frequency signal provided by the reference input unit respectively, so as to obtain a time deviation and/or a frequency deviation between satellite measurement data and the atomic time of the atomic time, and a time deviation and/or a frequency deviation between the satellite measurement data and the local coordination.

In an embodiment, the local time keeping structure comprises a reference input unit, a local clock and a time frequency signal output unit, wherein the reference input unit is used for domesticating the external time frequency reference signal to the local clock, so that the local clock is synchronous to the external time frequency reference signal; the local clock is used for generating a local time frequency signal, and can be a quartz crystal oscillator, a quartz crystal frequency standard and an atomic clock; the time frequency signal output unit is used for outputting a second pulse and a frequency signal generated by the local clock.

Fig. 11 is a flowchart of a time calibration method based on common view data according to an embodiment of the present invention, as shown in fig. 11, where the time calibration method based on common view data according to the embodiment includes:

step S1101, the time-consuming terminal receives the satellite measurement data and the time-frequency signal of the local time-keeping structure of the time-consuming terminal, calculates time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency signal of the local time-keeping structure of the time-consuming terminal, and sends the first common view data to at least one time-keeping unit.

Satellite co-vision is used for calibrating the time of a time-consuming terminal, wherein the time-consuming terminal can be any terminal needing accurate time signals, and the time-consuming terminal comprises a local time-keeping structure, namely the time-consuming terminal is provided with a local clock. However, the local time keeping structure of the time consuming terminal cannot provide a sufficiently accurate clock signal, so the present embodiment provides a method for performing time alignment based on common view data. The method is jointly participated by a time-consuming terminal and a time-keeping unit, wherein the time-keeping unit and the time-consuming terminal respectively generate common view data.

The time-consuming terminal receives satellite measurement data and a time-frequency signal of a local time-keeping structure of the time-consuming terminal. The time-consuming terminal comprises a GNSS receiver for receiving satellite measurement data of GNSS satellites. The time-consuming terminal also comprises a local time-keeping structure which can provide local time-frequency signals. And then the time-consuming terminal calculates time deviation data and/or frequency deviation data of the satellite measurement data and a time-frequency signal of a local time-keeping structure of the time-consuming terminal to serve as first common view data. The time consuming terminal then transmits the first common view data to at least one time keeping unit.

In particular, the time-of-use terminal may receive satellite measurement data and local second pulses and frequency signals of the time-of-use terminal.

In step S1102, the timekeeping unit receives the satellite measurement data and the local time-frequency measurement signal, calculates time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal as second common view data, calculates corrected time deviation data and/or frequency deviation data according to the first common view data and the second common view data, and transmits the corrected time deviation data and/or frequency deviation data to the time-consuming terminal.

The time keeping unit also needs to generate common view data, and the time keeping unit also comprises a GNSS receiver for receiving satellite measurement data of GNSS satellites. The timekeeping unit can also provide a more accurate time-frequency signal, so the timekeeping unit also obtains a local time-frequency measurement signal, wherein the local time-frequency signal can be a local coordination time signal and/or a comprehensive atomic time signal. And then the time keeping unit calculates time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signal to be used as second common view data. And then, calculating time deviation data and/or frequency deviation data between the first common view data and the second common view data by using a time keeping unit, and sending the time deviation data and/or frequency deviation data as corrected time deviation data and/or frequency deviation data to the time consumption terminal. The corrected time offset data and/or frequency offset data are used to calibrate the clock of the time consuming terminal.

Specifically, the second common view data is calculated by the time keeping unit, and any one of the following methods may be adopted:

the time keeping unit receives the satellite measurement data and the time-frequency measurement signal in local coordination, and calculates time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency measurement signal in local coordination to serve as second common view data.

And the time keeping unit receives the satellite measurement data and the time-frequency measurement signal of the comprehensive atomic time, and calculates time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency measurement signal of the comprehensive atomic time to obtain second common view data.

The time keeping unit receives satellite measurement data, time frequency measurement signals in local coordination and time frequency measurement signals in comprehensive atomic time, calculates time deviation data and/or frequency deviation data of the satellite measurement data and the time frequency measurement signals in local coordination and time deviation data and/or frequency deviation data of the satellite measurement data and the time frequency measurement signals in comprehensive atomic time respectively, and calculates corrected time deviation data and/or frequency deviation data as second common view data according to the time deviation data and/or frequency deviation data of the satellite measurement data and the time frequency measurement signals in local coordination and the time deviation data and/or frequency deviation data of the satellite measurement data and the time frequency measurement signals in comprehensive atomic time.

Specifically, the time keeping unit calculates and transmits the corrected time deviation data and/or frequency deviation data, which comprises at least one of the following modes:

when the time-consuming terminal performs time tracing, calculating to obtain corrected time deviation data according to the first common view data and the second common view data, and sending the corrected time deviation data to the time-consuming terminal; when the second common view data is calculated according to the time-frequency measurement signal during local coordination, the corrected time deviation data is the difference between the first common view data and the second common view data; when the second common view data is calculated according to the time-frequency measurement signals of the comprehensive atomic time, the corrected time deviation data is the time deviation data after the difference between the first common view data and the second common view data is compensated by the coordinated universal time.

And when the time-consuming terminal performs frequency tracing, calculating to obtain corrected frequency deviation data according to the first common view data and the second common view data, and transmitting the corrected frequency deviation number to the time-consuming terminal.

When the time-consuming terminal performs time and frequency tracing, corrected time deviation data and frequency deviation data are obtained through calculation according to the first common view data and the second common view data, and the corrected time deviation data and the corrected frequency deviation data are sent to the time-consuming terminal; when the second common view data is obtained by jointly using a time-frequency measurement signal obtained according to local coordination and a time-frequency measurement signal obtained according to comprehensive atomic time, the corrected time deviation data is the difference between the first common view data and the second common view data obtained according to local coordination, and the corrected frequency deviation data is the difference between the first common view data and the second common view data obtained according to local coordination and the frequency deviation data obtained by weighted average of the difference between the first common view data and the second common view data obtained according to comprehensive atomic time.

In step S1103, the time consuming terminal calibrates the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data.

And after the time-consuming terminal receives the corrected time deviation data and/or frequency deviation data, the local time-frequency signal is calibrated, so that the stability and accuracy of the local time-frequency signal are improved, and the time deviation of the time-consuming terminal relative to UTC is reduced.

In one possible implementation, the timekeeping units are at least two, and the timekeeping units providing local coordination and the timekeeping units providing comprehensive atomic are located at different sites.

In one possible implementation, the timekeeping unit includes a set of clocks for providing local coordination time and/or synthesis atomic time, the set of clocks including at least one light clock and/or at least one fountain clock.

In one possible implementation, the first and second common view data include transmission time interval adjustment data representing an acquisition interval between time offset data in the common view data. Wherein the transmission time interval adjustment data may be any time interval, for example any time interval of 1 second-1 day.

Because the local coordination time (UTC (k)) is subjected to human intervention/adjustment, the predictability of frequency characteristics is reduced, the frequency stability and accuracy of the time-consuming terminal atomic clock are improved by utilizing the comprehensive atomic time (TA (k)), and the time deviation of the time-consuming terminal time relative to the coordination Universal Time (UTC) is reduced.

When in use, the terminal is simultaneously driven by UTC (k) and TA (k), redundancy and mutual backup are realized, and reliability is improved.

When the frequency source B of the terminal is in use, similar to or better than the performance of the TA (k) reference atomic clock a, steering with TA (k) is more capable of exploiting the performance of the frequency source B such that the time scale generated by the frequency source B is equivalent to or better than the UTC (k) generated by the atomic clock a.

The source of TA (k) is a second long standard, if the TA (k) is introduced by the time-consuming terminal as an accurate frequency reference to drive the local atomic time scale, the frequency of the TA (k) can be more accurate and stable, which is equivalent to the repetition of the time-consuming terminal defined by seconds.

TA (k) is generated by time keeping of a clock group, has stronger frequency stability, and is more suitable for being used as a reference to evaluate the frequency characteristic of a time-consuming terminal frequency source;

the TA (k) is helpful for tracing the source of the UTC to the time-consuming terminal, and is suitable for international cooperation. The purpose of TA (k) is to reproduce the second definition, if TA (k) is introduced by the terminal as an accurate frequency reference to drive the frequency of the local frequency source (atomic clock or crystal oscillator), the obtained frequency can be more accurate and stable. In addition, when one of the UTC (k)/BDS/GPS or TA (k) is temporarily interrupted or has no signal, the other can play a role of redundancy and mutual backup, the reliability is improved, and the TA (k) can perform time frequency transmission through a GNSS (Global navigation satellite System) and other common view methods, so that the generation of the TA (k) and the UTC (k)/BDS/GPS can be different from the same place. Wherein BDS/GPS is a GNSS satellite positioning system.

The following specific steps of tracing the time frequency of the time consuming terminal are described in detail by specific embodiments:

step a) when the time-consuming terminal only depends on satellite measurement data (BDS/GPS) to trace time and frequency, a group of time difference between the time-consuming terminal and the BDS/GPS can be obtained through common-view data (CGGTTS file) generated by a GNSS receiver, the time difference data is calculated by adopting a two-point time difference method or a fitting method to calculate the relative frequency deviation of the time-consuming terminal, and the method can be completed only when the time-consuming terminal is in use.

And b) when the time-consuming terminal performs time tracing by means of BDS/GPS and performs frequency tracing by means of UTC (k), common-view data (CGGTTS file) generated by a GNSS receiver is sent to a time keeping unit through a protocol, the time keeping unit subtracts one group of common-view data of the time-consuming terminal from one group of common-view data of UTC (k) to obtain one group of time difference data of the time-consuming terminal and UTC (k), the time difference data adopts a two-point time difference method or a fitting method to calculate the relative frequency deviation of the time-consuming terminal, and the time keeping unit returns the relative frequency deviation to the time-consuming terminal through the protocol.

And c) when the time-consuming terminal performs time tracing by means of BDS/GPS and performs frequency tracing by means of TA (k), sending the common-view data (CGGTTS file) generated by the GNSS receiver to a time-keeping unit through a protocol, subtracting one group of common-view data of the time-consuming terminal from one group of common-view data of TA (k) by the time-keeping unit to obtain one group of time difference data of the time-consuming terminal and TA (k), calculating the relative frequency deviation of the time-consuming terminal by the time difference data by adopting a two-point time difference method or a fitting method, and returning the relative frequency deviation to the time-consuming terminal by the time-keeping unit through the protocol.

And d) when the time-consuming terminal only depends on UTC (k) to trace time and frequency, sending the common-view data (CGGTTS file) generated by the GNSS receiver to a time-keeping unit through a protocol, subtracting one group of common-view data of the time-consuming terminal and one group of common-view data of UTC (k) by the time-keeping unit to obtain one group of time difference data of the time-consuming terminal and UTC (k), wherein the time difference data can be directly used as the time difference data of the time-consuming terminal to be returned, calculating the relative frequency deviation of the time-consuming terminal by adopting a two-point time difference method or a fitting method by the time-keeping unit, and returning the time difference and the relative frequency deviation to the time-consuming terminal through the protocol.

And e) when the time-consuming terminal only depends on TA (k) to trace the time and frequency, sending the common-view data (CGGTTS file) generated by the GNSS receiver to a time-keeping unit through a protocol, subtracting one group of common-view data of the time-consuming terminal and one group of common-view data of TA (k) by the time-keeping unit to obtain one group of time difference data of the time-consuming terminal and TA (k), calculating the relative frequency deviation of the time-consuming terminal by adopting a two-point time difference method or a fitting method by the time difference data, and returning the relative frequency deviation and the time difference compensated by the time-keeping unit and UTC to the time-consuming terminal through the protocol.

Step f) when the time-consuming terminal performs time frequency tracing by means of UTC (k) and TA (k), namely redundant mutual backup is realized, two time marks are combined to improve reliability, common view data (CGGTTS file) generated by a GNSS receiver is sent to a time-keeping unit through a protocol, the time-keeping unit subtracts one group of common view data of the time-consuming terminal and one group of common view data of UTC (k) to obtain one group of time difference data of the time-consuming terminal and UTC (k), and the time difference data adopts a 'two-point time difference method' or a 'fitting method' to calculate the relative frequency deviation f of the time-consuming terminal and UTC (k) ₁ The time keeping unit then subtracts the same group of common view data of the time consuming terminal and one group of common view data of TA (k) to obtain one group of time difference data of the time consuming terminal and TA (k), and the time difference data adopts a two-point time difference method or a fitting method to calculate the relative frequency deviation f of the time consuming terminal and TA (k) ₂ For f ₁ And f ₂ Weighted average is carried out to obtain

The timekeeping unit returns the time difference between the user terminal and UTC (k) and f to the time-consuming terminal through a protocol; if TA (k) is controlled by light clock or cesium atom fountain clock, the frequency of the time consuming terminal is traced to TA (k), namely the second definition is transferred to the time consuming terminal, and the frequency of the terminal is highly accurate and stable in use.

Fig. 12 is a schematic structural diagram of a time calibration system based on common view data according to an embodiment of the present invention, as shown in fig. 12, where the time calibration system based on common view data according to the embodiment includes: time terminals and timekeeping units.

The time-consuming terminal comprises a first receiver and a terminal node, wherein the first receiver is used for receiving satellite measurement data and time-frequency measurement signals of a local time-keeping structure of the terminal node, and calculating time deviation data and/or frequency deviation data of the satellite measurement data and the time-frequency signals of the local time-keeping structure of the time-consuming terminal to serve as first common view data. The terminal node is configured to send first common view data to the timekeeping unit.

The time keeping unit comprises a second receiver and a clock group, the second receiver is used for receiving time-frequency measurement signals of the satellite measurement data and the clock group, calculating to obtain time deviation data and/or frequency deviation data of the satellite measurement data and the local time-frequency measurement signals, serving as second common view data, calculating to obtain corrected time deviation data and/or frequency deviation data according to the first common view data and the second common view data, and sending the corrected time deviation data and/or frequency deviation data to the time consuming terminal.

The terminal node is further configured to calibrate the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data.

As shown in fig. 12, the time-consuming terminal inputs the local second pulse and the frequency signal to the receiver, receives the co-view data output by the receiver, transmits the co-view data to the time-keeping unit, the time-keeping unit inputs the local second pulse and the frequency signal to the receiver, receives the co-view data output by the receiver, calculates the time difference and the frequency difference between the time-consuming terminal and the time-keeping unit by the time-keeping unit, and finally returns the time difference and the frequency difference data to the time-consuming terminal through a protocol, and the time-consuming terminal corrects the local time and the frequency according to the time difference and the frequency difference data to realize remote calibration.

The tracing of the time of the terminal can be obtained from TA (k)/UTC (k)/BDS/GPS through a GNSS receiver, and particularly can be realized by directly receiving radio signals transmitted by BDS/GPS, and then demodulating and decoding; the method can also compare with UTC (k) through GNSS co-view method, the time consuming terminal sends the co-view data (CGGTTS file) to the data processing and information release platform through the protocol, the platform calculates the time difference between the user and UTC (k), and finally the time difference data is returned to the time consuming terminal through the protocol; and the time difference generated by the comparison can be compared with TA (k) through a GNSS co-view method, the time difference is compensated with UTC through a data processing and information release platform, and finally the compensated time difference data is returned to the time-consuming terminal through a protocol.

The tracing of the frequency of the time-consuming terminal generates common-view data through the GNSS receiver, the common-view data is sent to the data processing and information publishing platform after being packaged by the protocol, the platform calculates the frequency deviation between the user and the TA (k), and finally the frequency deviation data is returned to the time-consuming terminal through the protocol, so that the frequency of the time-consuming terminal approaches to the TA (k). When the frequency deviation of the user from TA (k) is not available, UTC (k)/BDS/GPS can be used for calculating the frequency deviation instead of TA (k).

Wherein, UTC (k) and TA (k) may be located at the same location, and only one data processing and information publishing platform is required to be arranged, as shown in fig. 12. The UTC (k) and the TA (k) may not be located at the same location, and the user terminals are compared with the UTC (k) and the TA (k) by using a GNSS co-view method, so that the data processing and information publishing platforms may be respectively arranged in the time keeping units where the UTC (k) and the TA (k) are located, as shown in fig. 13, and fig. 13 is a schematic structural diagram of another time calibration system based on co-view data according to the embodiment of the present invention.

And the data processing and information publishing platform receives the common view data sent by the time-consuming terminal through the protocol, is used for calculating time difference and relative frequency deviation with UTC (k), a plurality of atomic clocks and TA (k), storing and displaying the time difference and relative frequency deviation data, and returns the time difference and relative frequency deviation data to the time-consuming terminal through the protocol. The platform periodically analyzes the time difference and the relative frequency deviation data (long-term time difference and frequency difference range, frequency stability and relative frequency deviation) of the time-consuming terminal to achieve the monitoring purpose, and meanwhile, the atomic clock data (time difference between the atomic clock and TA (k)) of each time-consuming terminal are added into the calculation of TA (k), so that the atomic clocks of TA (k) participating in the calculation are more and more. In addition, the platform also collects the common view data of UTC (k) and TA (k), the time difference between each atomic clock and UTC (k) and the time difference between each atomic clock and TA (k).

The tracing of the frequency of the time-consuming terminal generates common-view data through the GNSS receiver, the common-view data is sent to the data processing and information publishing platform after being packaged by the protocol, the platform calculates the frequency deviation between the user and the TA (k), and finally the frequency deviation data is returned to the time-consuming terminal through the protocol, so that the frequency of the time-consuming terminal approaches to the TA (k). When the frequency deviation of the user from TA (k) is not available, UTC (k)/BDS/GPS can be used for calculating the frequency deviation instead of TA (k). The UTC (k) and the TA (k) are located at the same place, and only one data processing and information publishing platform is needed to be arranged.

As an implementation manner, UTC (k) and TA (k) may not be located at the same location, and the user terminals are aligned with each other by using the GNSS co-view method, so that the data processing and information publishing platforms may be respectively disposed in laboratories where UTC (k) and TA (k) are located.

The time-consuming terminal monitoring center can establish the time and frequency of each time-consuming terminal to carry out data interaction according to the requirement of the time-consuming unit after the time and frequency of the time-consuming terminal are traced, so as to achieve the purpose of monitoring the time and frequency of each time-consuming terminal in the time-consuming unit.

Specifically, the timekeeping unit includes a clock group.

Specifically, local coordination time or comprehensive atomic time is provided by a clock group. Preferably, the clock group comprises at least one light clock. Preferably, the clock set includes at least one fountain clock.

Specifically, the timekeeping unit may include not less than two. Preferably, the timekeeping units each provide local coordination time and comprehensive atomic time. Preferably, the timekeeper unit provides at least local coordination or synthesis of atomic times. Preferably, there is at least one time keeping unit providing a comprehensive atomic time, at least one time keeping unit providing a local coordination time.

Specifically, the user terminal includes a terminal node. The end node outputs frequency and/or second pulses.

Specifically, the timekeeping unit communicates and/or data interacts with the time consuming terminal via a protocol.

Preferably, the protocol includes at least one of time difference, frequency difference, ID, and co-view data.

Preferably, the protocol includes at least time difference, frequency difference, and co-view data.

Specifically, the time-consuming terminal monitoring center performs data interaction with the time-consuming terminal.

The embodiment of the invention also comprises a time-consuming terminal, which comprises: a receiver and a terminal node; wherein the receiver comprises the receiver of the embodiment shown in fig. 4. The terminal node is used for transmitting the common view data calculated by the receiver to the time keeping unit, receiving the corrected time deviation data and/or frequency deviation data transmitted by the time keeping unit, and calibrating the local time-frequency signal according to the corrected time deviation data and/or frequency deviation data. Optionally, the time-consuming terminal comprises a mirrored atomic clock for providing the local time-frequency signal.

Specifically, the time-consuming terminal provided by the embodiment of the invention comprises the common view data, and performs weighted calculation on the same or different types of time deviation and/or frequency deviation contained in the common view data.

As an embodiment, the user terminal further comprises a mirrored atomic clock.

Preferably, when the time-consuming terminal performs time-frequency tracing by means of UTC (k) and TA (k), namely redundant mutual backup is realized, two time marks are combined to improve reliability, the common-view data (CGGTTS file) generated by the GNSS receiver is sent to a time-keeping unit through a protocol, the time-keeping unit obtains time difference data of the time-consuming terminal and at least one group of UTC (k) by subtracting one group of common-view data of the time-consuming terminal and at least one group of UTC (k) from the common-view data of the time-consuming terminal, and the time difference data adopts a 'two-point time difference method' or a 'fitting method' to calculate the relative frequency deviation f of the time-consuming terminal and UTC (k) _i 。

The time keeping unit then subtracts the same group of common view data of the time consuming terminal and the common view data of at least one group of TA (k) to obtain time difference data of the time consuming terminal and the at least one group of TA (k), and the time difference data adopts a two-point time difference method or a fitting method to calculate the relative frequency deviation f of the time consuming terminal and the TA (k) _j For at least one f _i And at least one f _j Weighted average is carried out to obtain f, and a time keeping unit is obtained to ensure that the user terminal and UTC are carried outk) The time difference and f of (1) is returned to the time consuming terminal by the protocol.

Calculating omega weight, optionally, evaluating the time stability, frequency stability, relative frequency deviation and time frequency difference of UTC (k) and TA (k) by UTC, and comprehensively selecting the time stability, frequency stability, relative frequency deviation and time frequency difference index to allocate the weight; the time stability, frequency stability, relative frequency deviation and time frequency difference of UTC (k) and TA (k) can be evaluated by using a clock, and the time stability, frequency stability, relative frequency deviation and time frequency difference index are comprehensively selected to be allocated with weights.

The sum of weights of UTC (k) and TA (k) is 1.

The UTC (k) time standard and the TA (k) frequency standard, and the standard time output signal is evaluated by adopting two technical indexes: 1) The time is accurate; 2) The frequency is accurate, and the weighting mode is determined according to the using targets according to different using targets.

The embodiment of the invention also provides a time stamp generating method, which comprises the following steps: the time-consuming terminal provided by the embodiment of the invention acquires the calibrated time-frequency signal; and (5) time-giving the time stamp server according to the calibrated time-frequency signal, and stamping a time stamp.

A time stamp is a complete, verifiable data that can represent a piece of data that has existed before a particular time, and a time stamp system is a trusted third party that is used to generate a time stamp. The time stamping system can serve as a component of the digital certificate authentication system or can serve alone. The time stamp can be widely applied to the aspects of intellectual property protection, contract signing, financial accounting, electronic quotation bidding, stock trading, heritage or other statement, personal file management and the like. In particular, the formal release of the electronic signature method of the people's republic of China gives legal effectiveness to the electronic signature, the electronic signature has the same position as the signature in the real world, and the time stamp service plays a vital role in the electronic signature.

The time of the time consuming terminal after UTC (k) and TA (k) are controlled is transmitted to the time stamp server, so that the time resolution of stamping of the time stamp server can be improved, the sequence of stamping data can be distinguished more precisely, and the service capacity of the time stamp server can be improved. Fig. 14 is an application schematic diagram of a timestamp generation method according to an embodiment of the present invention, as shown in fig. 14.

The embodiment of the invention also provides a data mining method, which comprises the following steps: the time-consuming terminal provided by the embodiment of the invention acquires the calibrated time-frequency signal; and timing the plurality of data mining servers according to the calibrated time-frequency signals, so that the plurality of data mining servers finish accurate sequencing and/or screening of data according to the calibrated time-frequency signals.

In the fields of internet of things, finance, traffic and the like, the requirements for intelligent technologies such as big data, artificial intelligence and the like are more and more extensive, and the problem is how to accurately sort and screen in mass data, so that subsequent data mining and analysis are related, and valuable information is extracted to help guide the development of various industries.

Time is a main dimension of data analysis, a large amount of data generated by different places at present, the time-keeping deviation is not quantified, all time-synchronous experimental data which are not exact and credible are used as supports, and corresponding guarantee measures are also lacked. Especially, the distance span is large, the synchronous time is inconsistent, the equipment types are inconsistent and the equipment runs continuously for a long time, and a performance index monitoring means is lacked. The widely adopted single time service mode cannot realize the quantized time synchronization requirement.

Fig. 15 is a schematic diagram of an application of the data mining method according to the embodiment of the present invention, as shown in fig. 15. Through the time-frequency transmission technology of the scheme, the time-consuming terminal has high accuracy, stability and reliability, each business logic and each data are accurately marked by the time, powerful support is provided for big data analysis and artificial intelligence, and the reality and the effectiveness of auxiliary decision making are improved.

It should be noted that, in each embodiment of the present invention, each functional unit/module may be integrated in one processing unit/module, or each unit/module may exist alone physically, or two or more units/modules may be integrated in one unit/module. The integrated units/modules described above may be implemented either in hardware or in software functional units/modules.

From the description of the embodiments above, it will be apparent to those skilled in the art that the embodiments described herein may be implemented in hardware, software, firmware, middleware, code, or any suitable combination thereof. For a hardware implementation, the processor may be implemented in one or more of the following units: an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a processor, a controller, a microcontroller, a microprocessor, other electronic units designed to perform the functions described herein, or a combination thereof. For a software implementation, some or all of the flow of an embodiment may be accomplished by a computer program to instruct the associated hardware. When implemented, the above-described programs may be stored in or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. The computer readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A method of generating common view data, comprising:

receiving satellite measurement data;

2. The method according to claim 1, wherein said calculating time offset data and/or frequency offset data of said satellite measurement data and said local time-frequency measurement signal comprises:

3. A time consuming terminal comprising a receiver and a terminal node;

4. A time-consuming terminal according to claim 3, wherein the receiver is configured to calculate frequency deviation data of the satellite measurement data and the local time-frequency measurement signal;

5. A time alignment system, comprising: at least one time-consuming terminal according to claim 3 or 4 and at least one time-keeping unit;

6. A time stamp generating method, comprising: a time-consuming terminal performs time and/or frequency calibration by receiving common view data sent by a time-keeping unit through a protocol, wherein the time-consuming terminal comprises the time-consuming terminal as claimed in claim 3 or 4;

7. A method of data mining, comprising: a time-consuming terminal performs time and/or frequency calibration by receiving common view data sent by a time-keeping unit through a protocol, wherein the time-consuming terminal comprises the time-consuming terminal as claimed in claim 3 or 4;