Co-sight data generation method, receiver and time calibration system

Abstract

The application discloses a kind of common view data generation method, receiver and time calibration system, a kind of common view data generation method includes: receiving satellite measurement data;Obtain the virtual time-frequency measurement signal provided by mirror atomic clock;The time deviation data and / or frequency deviation data of the satellite measurement data and the virtual time-frequency measurement signal provided by mirror atomic clock are calculated as common view data.The common view data generation method, receiver and time calibration system disclosed in the embodiment of the application can improve the accuracy of time calibration.

Description

[0001] This invention is a divisional application of application number 202110389864.7, entitled "Common View Data Generation Method, Receiver and Time Calibration System". Technical Field

[0002] The embodiments of the present invention relate to time calibration technology, and more particularly to a common-view data generation method, a receiver, and a time calibration system. Background Technology

[0003] With the development of science and technology, the importance of high-precision time and frequency in national economic development has become increasingly prominent. Precision time has wide applications in many aspects of national defense modernization and national economic construction. High-precision time standards are required in many scientific research fields, such as metrology, calibration, and event timestamping. Precision timing, modern communication, navigation and positioning, and computer automatic control all rely on precise time scales and time and frequency measurement technologies (see Patent Document 1 (US5757916)). Similarly, there are Patent Documents 2 (CN101014874A), 3 (CN101843010A), and 4 (CN103283288A). Atomic time scales are the core of the time and frequency system, enabling international traceability and the transfer of measurement values. They play a crucial role in the time and frequency system, and highly stable and accurate time scales are key to its success.

[0004] The internationally used unified time is Coordinated Universal Time (UTC), which is obtained by adding leap seconds to International Atomic Time (TAI). TAI is the result of collaboration among time and frequency laboratories worldwide. Data from over 400 atomic clocks in more than 50 laboratories are weighted, averaged, and then driven by a reference clock. The International Bureau of Weights and Measures (BIPM) is responsible for managing and publishing TAI and UTC, typically issuing a time bulletin with a lag of 30 to 45 days. This bulletin includes the time difference between UTC and the various laboratories, as well as the time difference between UTC and the atomic clocks involved in the TAI calculations.

[0005] A timekeeping unit generally consists of an atomic clock, internal measurement, traceability and comparison, time scale generation, and time transfer components. Among them, a clock group composed of multiple atomic clocks works together to keep time and generate a local atomic time scale (Comprehensive Atomic Time TA(k), where k is used to represent the code of each timekeeping unit), which has good stability and robustness. TA(k) is also generated by weighted averaging of atomic clock data, and is generally more than one day behind. Through the time transfer system, UTC and TA(k) work together to generate the local Coordinated Time UTC(k).

[0006] To improve the accuracy of local Coordinated Universal Time (UTC(k)) for various timekeeping units, a satellite common-view method for time calibration is proposed. The satellite common-view method is a method for comparing the time of two clocks or two local Universal Time locations that are geographically distant. Common-view means that both locations can simultaneously see the same satellite and simultaneously measure the time difference between their local clocks and the time received from the satellite. The data is then exchanged to determine the time difference between the two clocks. Non-patent literature 1 (Wang Liping, Xu Liang, Principle of Remote Time and Frequency Calibration Based on Satellite Common-View Method, Shanghai Metrology and Testing, 2019.3, No. 274) systematically introduces conventional methods for achieving high accuracy time and frequency standards via satellite and their transmission, comparison, and synchronization methods. However, based on the satellite common-view method, currently, existing users' local standard time and frequency are generally traced back to UTC(k) / BDS / GPS first, and then indirectly traced back to UTC.

[0007] Users typically trace back to UTC(k) using the Global Navigation Satellite System (GNSS) common-view technique (GNSS common-view method), as detailed in Non-Patent Document 2 (Chen Ruiqiong, Research and Engineering Implementation of UTC(NTSC) Remote Reproduction Method (D), University of Chinese Academy of Sciences) and Patent Document 5 (US2018 / 0011199A1). Other satellite systems, such as China's BeiDou satellite system, can also be used; see Patent Document 6 (CN201811252379, Common-view Data Transmission and Time Synchronization Method and System Based on BeiDou RDSS). Considering the time delay and error of a single satellite signal, the common-view method uses the average time difference of multiple satellite signals to improve the accuracy of time-frequency comparison, thereby tracing back to UTC(k), as detailed in Patent Document 7 (WO02 / 061449A1). However, due to human intervention / adjustment, the frequency characteristics and predictability of UTC(k) / BDS / GPS will decrease. Therefore, it will affect the accuracy of time calibration using the satellite common-view method.

[0008] Other prior art relating to the above-mentioned technical fields, including but not limited to the patents or non-patent documents listed below, are incorporated herein by reference.

[0009] A high-precision time and frequency source that is disciplined to a time and frequency standard in real time, CN103226324B

[0010] A time-frequency transfer data acquisition and processing system based on a global navigation satellite system, CN102590836B; A remote calibration method and system for frequency standards, CN101692163B

[0011] A virtual atomic clock system and its working method for monitoring physical atomic clocks, CN110837219A

[0012] A time-frequency transfer method and receiver based on the fusion of multiple GNSS systems, CN102004258B

[0013] High-precision time and frequency source based on fiber optic time transfer, CN106506106B

[0014] Optical fiber unidirectional time-frequency transmission system and method, CN106571874B

[0015] Enhanced stability for local atomic clock ensemble time scale using weightedmoving average filter,doi:10.1109 / ICMA.2016.7558864

[0016] Agenerating procedure for local atomic clock ensemble time scale,doi:10.1109 / IAEAC.2017.8054040

[0017] Enhanced predictability of hydrogen maser using random pursuit strategy,doi:10.1109 / FCS.2017.8089011

[0018] Time transfer via different GNSS systems,doi:10.23919 / URSIAP-RASC.2019.8738763.

[0019] Further results of time transfer through the optical fiber at NIM,doi:10.1109 / FCS.2017.8089010

[0020] Disciplined oscillator system by UTC(NIM) for remote time andfrequencytraceability,doi:10.1109 / EFTF.2014.7331537

[0021] New timekeeping system and its time link calibration at NIM,doi:10.1109 / FCS.2014.6859896

[0022] Research on modification of H-maser drift,doi:10.1109 / FCS.2014.6859953 Summary of the Invention

[0023] This invention provides a common-view data generation method, a receiver, and a time calibration system, which can improve the accuracy of time calibration.

[0024] In a first aspect, embodiments of the present invention provide a common-view data generation method, comprising:

[0025] Receive satellite measurement data;

[0026] Obtain the virtual time-frequency measurement signal provided by the mirror atomic clock;

[0027] Calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the virtual time-frequency measurement signal provided by the mirror atomic clock, and use this as common-view data.

[0028] In a second aspect, embodiments of the present invention provide a receiver, comprising:

[0029] Satellite signal receiving unit, used to receive satellite measurement data;

[0030] The local signal acquisition unit is used to acquire the virtual time and frequency measurement signal provided by the mirror atomic clock;

[0031] The data generation module is used to calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the virtual time and frequency measurement signal provided by the mirror atomic clock.

[0032] Thirdly, embodiments of the present invention provide a calibration method, including:

[0033] The timekeeping unit transmits the common-view data to the time-using terminal via a protocol and performs time and / or frequency calibration. The common-view data is generated according to the common-view data generation method described in the first aspect.

[0034] Fourthly, embodiments of the present invention provide a time calibration system, comprising: at least one time-using terminal and at least one time-keeping unit;

[0035] The at least one time-using terminal receives common-view data sent by the timekeeping unit through a protocol to perform time and / or frequency calibration;

[0036] The at least one timekeeping terminal and the at least one timekeeping unit include a receiver as described in the second aspect.

[0037] Fifthly, embodiments of the present invention provide a time-use terminal, including: a receiver and a terminal node;

[0038] The receiver includes the receiver as described in the second aspect;

[0039] The terminal node is used to send the common-view data calculated by the receiver to the timekeeping unit, and to receive the corrected time deviation data and / or frequency deviation data sent by the timekeeping unit, and to calibrate the local time and frequency signal according to the corrected time deviation data and / or frequency deviation data.

[0040] In a sixth aspect, embodiments of the present invention provide a timestamp generation method, comprising: acquiring a calibrated time-frequency signal using a time-using terminal according to any possible implementation of the fifth aspect;

[0041] The time stamp server is synchronized with the calibrated time and frequency signal, and a time stamp is added.

[0042] In a seventh aspect, embodiments of the present invention provide a data mining method, comprising: acquiring a calibrated time-frequency signal using a time-using terminal according to any of the aforementioned possible implementations;

[0043] The time and frequency signals are used to time multiple data mining servers so that they can accurately sort and / or filter the data based on the calibrated time and frequency signals.

[0044] The common-view data generation method, receiver, and time calibration system provided in this invention obtain common-view data based on the time deviation and / or frequency deviation data of the virtual time-frequency measurement signal provided by the satellite measurement data and the mirror atomic clock. The common-view data is then used for time calibration, thereby improving the accuracy of time calibration. Attached Figure Description

[0045] Figure 1 A flowchart of a common-view data generation method provided in an embodiment of the present invention;

[0046] Figure 2 A flowchart for generating common-view data based on time-frequency measurement signals from satellite measurement data and local timekeeping structures;

[0047] Figure 3 A flowchart for generating common-view data based on satellite measurement data and time-frequency measurement signals from integrated atomic time;

[0048] Figure 4 A flowchart for generating common-view data based on satellite measurement data and time-frequency measurement signals from integrated atomic time and local coordinated time;

[0049] Figure 5 A schematic diagram of a receiver provided in an embodiment of the present invention;

[0050] Figure 6 A schematic diagram of the input / output structure of a receiver provided in an embodiment of the present invention;

[0051] Figure 7 A schematic diagram of the logic structure of a receiver provided in an embodiment of the present invention;

[0052] Figure 8 A schematic diagram of another receiver input / output structure provided in an embodiment of the present invention;

[0053] Figure 9 A schematic diagram of another receiver input / output structure provided in an embodiment of the present invention;

[0054] Figure 10 A schematic diagram of the logical structure of another receiver provided in an embodiment of the present invention;

[0055] Figure 11 A flowchart of a time calibration method based on common-view data provided in an embodiment of the present invention;

[0056] Figure 12 A schematic diagram of a time calibration system based on common-view data provided in an embodiment of the present invention;

[0057] Figure 13 A schematic diagram of another time calibration system based on common-view data provided in an embodiment of the present invention;

[0058] Figure 14 This is an application diagram of the timestamp generation method provided in the embodiments of the present invention;

[0059] Figure 15 This is a schematic diagram illustrating the application of the data mining method provided in an embodiment of the present invention. Detailed Implementation

[0060] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0061] International Atomic Time (TAI) is the result of collaboration among time and frequency laboratories worldwide. TAI, with leap seconds added, yields the unified time used internationally, Coordinated Universal Time (UTC). TAI is generated by weighted averaging of data from over 400 atomic clocks in more than 50 laboratories globally, then controlled by a reference clock. The International Bureau of Weights and Measures (BIPM) manages and publishes TAI and UTC, typically issuing a time bulletin 30 to 45 days later. This bulletin includes the time difference between UTC and each laboratory, as well as the time difference between UTC and the atomic clocks involved in the TAI calculations. Organizations participating in TAI are known as timekeeping units, such as the National Institute of Metrology (NIM), the National Time Service Center (NTSC) of the Chinese Academy of Sciences, and the Beijing Radio Institute of Metrology (BIRM). Each timekeeping unit generates its own local Coordinated Time (UTC(k), such as UTC(NIM), UTC(NTSC), and UTC(BIRM).

[0062] Timekeeping units generally consist of atomic clocks, internal measurement, traceability and comparison, time scale generation, and time transmission components. Among them, clock groups composed of multiple atomic clocks work together to keep time and generate a local atomic time scale (comprehensive atomic time TA(k)), which has good stability and robustness. TA(k) is also generated by weighted averaging of atomic clock data, and generally lags by more than one day. The time transmission system enables UTC and TA(k) to work together to generate UTC(k).

[0063] To achieve accurate time synchronization, the satellite common-view method has been proposed, which can correct the time of time-using terminals. However, based on the satellite common-view method, the local standard time and frequency of existing users are generally traced back to UTC(k) or satellite data (such as BeiDou Navigation Satellite System (BDS) data or Global Positioning System (GPS) data). k is the code for each timekeeping unit, and then indirectly traced back to UTC. Considering the time delay and error of a single satellite signal, the satellite common-view method uses the average of the time differences of multiple satellite signals to improve the accuracy of time and frequency comparison, thereby tracing back to UTC(k). However, because UTC(k) or satellite data is subject to human intervention / adjustment, its frequency characteristics and predictability will decrease, thus affecting the accuracy of time synchronization.

[0064] Figure 1 A flowchart of a common-view data generation method provided in an embodiment of the present invention is shown below. Figure 1 As shown, the common-view data generation method provided in this embodiment includes:

[0065] Step S101: Receive satellite measurement data.

[0066] The common-view data generation method provided in this embodiment is applied to a receiver that uses the satellite common-view method for time calibration. First, using the satellite common-view method requires receiving satellite measurement data, that is, receiving time data transmitted by satellites. This satellite measurement data can be measurement data received from a Global Navigation Satellite System (GNSS). Currently, various GNSS systems provide time information, such as BDS and GPS, and receivers that meet the requirements of each GNSS can receive the satellite measurement data transmitted by that GNSS. However, in this embodiment, the satellite measurement data can also be received from other types of satellites. The satellite measurement data can be received from one satellite or from multiple satellites. If the satellite measurement data is received from multiple satellites, then the satellite measurement data received from multiple satellites can be processed to eliminate the deviations between the satellite measurement data, resulting in corrected satellite measurement data.

[0067] Specifically, receiving satellite measurement data includes receiving satellite signals through an antenna, amplifying and frequency-converting the signals to form intermediate frequency signals, and then acquiring, tracking, demodulating, calculating, and measuring them to obtain navigation messages.

[0068] Step S102: Obtain the local time and frequency measurement signal.

[0069] Next, based on the common-view satellite method, it is necessary to acquire the local time-frequency measurement signal. The local time-frequency measurement signal is the time-frequency measurement signal of the clock signal for which time information is provided locally by the receiver. It can be the time-frequency measurement signal of the receiver's local timekeeping structure.

[0070] Depending on the deployment location of the receiver, acquiring local time and frequency measurement signals may include acquiring at least one of the following: local time-keeping structure time and frequency measurement signals, local Coordinated Time (UTC) (k), integrated atomic time (TA) (k), and virtual time and frequency measurement signals provided by a mirror atomic clock, where k represents the code of the time-keeping unit.

[0071] It should be noted that the execution order of steps S101 and S102 is not limited to this; steps S101 and S102 can be executed simultaneously or in any order.

[0072] Step S103: Calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the local time-frequency measurement signal, as common-view data.

[0073] Finally, the time and / or frequency deviations between the satellite measurement data and the local time-frequency measurement signal are calculated and used as common-view data. The common-view data may include only the time deviation between the satellite measurement data and the local time-frequency measurement signal, only the frequency deviation, or both. The generated common-view data is used to calibrate the clock's time and / or frequency deviations.

[0074] The time deviation between the local timekeeping structure and the satellite, as well as the ionospheric delay correction value, are obtained. The time deviation is further corrected for delay, and finally, after filtering, the common-view data is obtained.

[0075] The receiver that generates common-view data can be located at either the time-using terminal or the time-keeping unit. The time-using terminal and the time-keeping unit can generate common-view data according to the above method. Then, the time-keeping unit can correct the common-view data generated by the time-using terminal based on its own generated common-view data, thereby correcting the local clock of the time-using terminal.

[0076] When the acquired time-frequency measurement signal is a local time-keeping structure time-frequency measurement signal, the time deviation data and / or frequency deviation data between the satellite measurement data and the local time-keeping structure time-frequency measurement signal are calculated to obtain common-view data. When the acquired time-frequency measurement signal is a local coordinated time time-frequency measurement signal, the time deviation data and / or frequency deviation data between the satellite measurement data and the local coordinated time time-frequency measurement signal are calculated to obtain common-view data. When the acquired time-frequency measurement signal is a composite atomic time time-frequency measurement signal, the time deviation data and / or frequency deviation data between the satellite measurement data and the composite atomic time time-frequency measurement signal are calculated to obtain common-view data. Alternatively, the common-view data can be a combination of any of the above-mentioned time deviation data and / or frequency deviation data.

[0077] If the acquired local time-frequency measurement signal is a local time-keeping structure time-frequency measurement signal, it can be the second pulse and frequency signal of the local time-keeping structure. If the acquired local time-frequency measurement signal is a local coordinated time time-frequency measurement signal, it can be the second pulse and frequency signal of the local coordinated time. If the acquired local time-frequency measurement signal is a combined atomic time time-frequency measurement signal, it can be the second pulse and frequency signal of the combined atomic time.

[0078] In addition, local coordinated time and integrated atomic time are provided by clock groups, which include at least one optical clock and / or at least one fountain clock.

[0079] Preferably, the generated common-view data includes satellite measurement data and time deviation data and / or frequency deviation data of integrated atomic time.

[0080] Preferably, the generated common-view data includes time deviation data and / or frequency deviation data between satellite measurement data and integrated atomic time, and simultaneously includes time deviation data and / or frequency deviation data between satellite measurement data and local coordination time.

[0081] Preferably, the generated common-view data includes satellite measurement data and time deviation data and / or frequency deviation data of integrated atomic time, while another set of common-view data includes satellite measurement data and time deviation data and / or frequency deviation data of local coordination time.

[0082] Preferably, the generated common-view data includes satellite measurement data and time deviation data and / or frequency deviation data of integrated atomic time, while another common-view data includes satellite measurement data and time deviation data and / or frequency deviation data of the local timekeeping structure of the time-using terminal.

[0083] The common-view data generation method provided in this embodiment obtains common-view data based on the time and / or frequency deviation data of satellite measurement data and local time and frequency measurement data. Using this common-view data for time calibration improves the accuracy of time calibration. In particular, when the local time and frequency data is a time and frequency measurement signal of integrated atomic time, the predictability of its frequency characteristics decreases due to human intervention / adjustment of the local Coordinated Universal Time (UTC). Calculating common-view data using integrated atomic time improves the stability and accuracy of time calibration using the satellite common-view method, and reduces the time deviation of the calibration time relative to Coordinated Universal Time.

[0084] Figures 2-4 This is a flowchart illustrating the specific processing steps of the common-view data generation method provided in this embodiment of the invention. Figure 2 A flowchart for generating common-view data based on satellite measurement data and time-frequency measurement signals from a local timekeeping structure. Figure 3 A flowchart for generating common-view data based on satellite measurement data and time-frequency measurement signals from integrated atomic time. Figure 4 A flowchart for generating common-view data based on satellite measurement data and time-frequency measurement signals from integrated atomic time and local coordinated time.

[0085] in Figure 2 The processing flow shown is as follows: the receiver receives the second pulse and frequency signal of the local timekeeping structure, receives the satellite signal through the antenna, amplifies and converts the signal to form an intermediate frequency signal, and then performs acquisition, tracking, demodulation, calculation and measurement to obtain the navigation message, the time deviation between the local timekeeping structure and the satellite, and the ionospheric delay correction value. The time deviation is further delayed and corrected, and finally, after filtering, the common-view data is obtained.

[0086] Figure 3 The processing flow shown is in Figure 2 Based on this, the second pulse and frequency signal of the integrated atomic time are connected to the receiver. The receiver receives satellite signals through the antenna and outputs the common-view data of the integrated atomic time.

[0087] Figure 4 The processing flow shown is in Figure 2 Based on this, the second pulse and frequency signals of integrated atomic time and local coherent time are input into the receiver. The receiver receives satellite signals through the antenna and outputs the common view data of integrated atomic time and local coherent time.

[0088] Figure 5 This is a schematic diagram of the structure of a receiver provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the receiver provided in this embodiment includes:

[0089] The satellite signal receiving unit 51 is used to receive satellite measurement data; the local signal acquisition unit 52 is used to acquire local time and frequency measurement signals; and the common-view data generation module 53 is used to calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the local time and frequency measurement signals as common-view data.

[0090] The receiver provided in this embodiment is used to perform... Figure 1 The common-view data generation method shown here, its implementation principle and technical effects are excellent, and will not be elaborated here.

[0091] Furthermore, the local signal acquisition module 52 is specifically used to acquire at least one of the following: the time-frequency measurement signal of the local timekeeping structure, the time-frequency measurement signal of the local coordinated time, the time-frequency measurement signal of the integrated atomic time, and the virtual time-frequency measurement signal provided by the mirror atomic clock. The virtual time-frequency measurement signal provided by the mirror atomic clock can specifically be at least one of the following: the time-frequency measurement signal of the virtual local timekeeping structure, the time-frequency measurement signal of the local coordinated time, and the time-frequency measurement signal of the integrated atomic time, or any combination thereof.

[0092] The common-view data generation module 53 is specifically used to calculate at least one of the following: time deviation data and / or frequency deviation data between satellite measurement data and time-frequency measurement signals of local timekeeping structure, time deviation data and / or frequency deviation data between satellite measurement data and time-frequency measurement signals of local coordinated time, and time deviation data and / or frequency deviation data between satellite measurement data and time-frequency measurement signals of integrated atomic time, as common-view data.

[0093] Furthermore, the time-frequency measurement signal of the local timekeeping structure includes: the frequency and / or second pulse of the local timekeeping structure; the time-frequency measurement signal of the local coordinated time includes: the frequency and / or second pulse of the local coordinated time; and the time-frequency measurement signal of the integrated atomic time includes: the frequency and / or second pulse of the integrated atomic time.

[0094] Furthermore, local coordinated time and integrated atomic time are provided by a clock array, which includes at least one optical clock and / or at least one fountain clock.

[0095] Figure 6 A schematic diagram of the input / output structure of a receiver provided in an embodiment of the present invention is shown below. Figure 6 As shown, the receiver receives satellite measurement data via an antenna and also receives local time-frequency measurement signals, which include second pulses and / or frequencies. The second pulses and / or frequencies include the frequency and / or second pulses of the local timekeeping structure, the frequency and / or second pulses of the local coordinated time, and the frequency and / or second pulses of the integrated atomic time.

[0096] Figure 7 This is a schematic diagram of the logic structure of a receiver provided in an embodiment of the present invention, as shown below. Figure 7As shown, the receiver includes a reference input unit, an acquisition and tracking solution unit, an amplification and frequency conversion unit, a common-view data processing unit, and a data input / output unit.

[0097] The reference input unit is used to input the local time and frequency measurement signal (which can be provided by local Coordinated Time, Integrated Atomic Time, or Local Timekeeping Structure) into the receiver and to provide the input time and frequency signal to the acquisition and tracking solution unit.

[0098] The amplification and frequency conversion unit is used to amplify and frequency convert the radio satellite signals received by the antenna to generate intermediate frequency signals and provide them to the acquisition and tracking solution unit.

[0099] The acquisition, tracking, and calculation unit acquires, tracks, calculates, and measures the intermediate frequency signal output by the amplification and frequency conversion unit based on the time and frequency signal provided by the reference input unit, obtains the time deviation and / or frequency deviation between the local time and frequency measurement signal and the satellite measurement data, and then passes the time deviation and / or frequency deviation to the common-view data processing unit.

[0100] The common-view data processing unit encapsulates and organizes the time deviation and / or frequency deviation data provided by the capture and tracking solution unit to form common-view data, which is then submitted to the data input and output unit.

[0101] The data input / output unit transmits common-view data via the network and can also receive control signals for the receiver from the network, enabling simple configuration of the receiver.

[0102] Figure 8 A schematic diagram of the input / output structure of another receiver provided in an embodiment of the present invention is shown below. Figure 8 As shown, the receiver is able to calculate the time and / or frequency deviation between the measurement satellite and the integrated atomic time.

[0103] Figure 9 A schematic diagram of the input / output structure of another receiver provided in an embodiment of the present invention is shown below. Figure 9 As shown, the receiver can calculate the time and / or frequency deviations when the measurement satellite is coordinated with the local system.

[0104] Figure 10 This is a schematic diagram of the logical structure of another receiver provided in an embodiment of the present invention, as shown below. Figure 10As shown, the second pulse and frequency signals of the integrated atomic time and the local coordinated time are respectively provided to the receiver as local time and frequency measurement signals. The time and frequency signals of the integrated atomic time and the local coordinated time are provided to two acquisition, tracking and solving units through two different reference input units inside the receiver. At the same time, the amplification and frequency conversion unit amplifies and converts the radio satellite signal received by the antenna to generate an intermediate frequency signal and provides it to the two acquisition, tracking and solving units. Finally, the two acquisition, tracking and solving units acquire, track, solve and measure the intermediate frequency signal output by the amplification and frequency conversion unit based on the time and frequency signals provided by the reference input units, respectively, to obtain the time deviation and / or frequency deviation between the satellite measurement data and the integrated atomic time, as well as the time deviation and / or frequency deviation between the satellite measurement data and the local coordinated time.

[0105] In one embodiment, the local timekeeping structure includes a reference input unit, a local clock, and a time-frequency signal output unit. The reference input unit is used to discipline the local clock with an external time-frequency reference signal, thereby synchronizing the local clock with the external time-frequency reference signal. The local clock is used to generate a local time-frequency signal. Optionally, the local clock can be a quartz crystal oscillator, a quartz crystal frequency standard, or an atomic clock. The time-frequency signal output unit is used to output the second pulse and frequency signal generated by the local clock.

[0106] Figure 11 A flowchart of a time calibration method based on common-view data provided in an embodiment of the present invention is shown below. Figure 11 As shown, the time calibration method based on common-view data provided in this embodiment includes:

[0107] Step S1101: The time terminal receives satellite measurement data and the time-frequency signal of the local timekeeping structure of the time terminal, calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the time-frequency signal of the local timekeeping structure of the time terminal, uses it as the first common view data, and sends the first common view data to at least one timekeeping unit.

[0108] The common-view satellite method is used to calibrate the time of time-using terminals. These terminals can be any type of terminal requiring precise time signals and include a local timekeeping structure, meaning they possess a local clock. However, the local timekeeping structure of a time-using terminal cannot provide a sufficiently accurate clock signal. Therefore, this embodiment provides a method for time calibration based on common-view data. This method involves both the time-using terminal and a timekeeping unit, with each generating common-view data.

[0109] The timing terminal receives satellite measurement data and time-frequency signals from its local timekeeping structure. The timing terminal includes a GNSS receiver to receive satellite measurement data from GNSS satellites. It also includes a local timekeeping structure capable of providing local time-frequency signals. The timing terminal then calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the time-frequency signals from its local timekeeping structure, using this as first common-view data. The timing terminal then transmits this first common-view data to at least one timekeeping unit.

[0110] Specifically, the timing terminal can receive satellite measurement data and the local second pulse and frequency signal of the timing terminal.

[0111] In step S1102, the timekeeping unit receives satellite measurement data and local time-frequency measurement signals, calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the local time-frequency measurement signals as the second common-view data, and calculates the corrected time deviation data and / or frequency deviation data based on the first common-view data and the second common-view data, and sends the corrected time deviation data and / or frequency deviation data to the time-using terminal.

[0112] The timekeeping unit also needs to generate common-view data. This unit also includes a GNSS receiver to receive satellite measurement data from GNSS satellites. The timekeeping unit can also provide more accurate time-frequency signals; therefore, it also acquires local time-frequency measurement signals, which can be local Coordinated Time (UTC) signals and / or composite atomic time signals. Next, the timekeeping unit calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the local time-frequency measurement signal, as the second common-view data. Then, the timekeeping unit calculates the time deviation data and / or frequency deviation data between the first and second common-view data, and sends this as corrected time deviation data and / or frequency deviation data to the time-using terminal. The corrected time deviation data and / or frequency deviation data are used to calibrate the clock of the time-using terminal.

[0113] Specifically, the second common-view data can be calculated using any of the following methods:

[0114] The timekeeping unit receives satellite measurement data and local time-frequency measurement signals, calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the local time-frequency measurement signals, and uses this as the second common-view data.

[0115] The timekeeping unit receives satellite measurement data and time-frequency measurement signals of integrated atomic time, calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the time-frequency measurement signals of integrated atomic time, and uses this as the second common-view data.

[0116] The timekeeping unit receives satellite measurement data, local coordinated time and frequency measurement signals, and integrated atomic time and frequency measurement signals. It calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the local coordinated time and frequency measurement signals, as well as the time deviation data and / or frequency deviation data between the satellite measurement data and the integrated atomic time and frequency measurement signals. Based on the time deviation data and / or frequency deviation data between the satellite measurement data and the local coordinated time and frequency measurement signals, and the time deviation data and / or frequency deviation data between the satellite measurement data and the integrated atomic time and frequency measurement signals, it calculates corrected time deviation data and / or frequency deviation data, which are used as the second common-view data.

[0117] Specifically, the punctuality unit calculates and sends corrected time deviation data and / or frequency deviation data, including at least one of the following methods:

[0118] When the time-using terminal performs time tracing, it calculates the corrected time deviation data based on the first common-view data and the second common-view data, and sends the corrected time deviation data to the time-using terminal. Specifically, when the second common-view data is calculated based on the time-frequency measurement signal of local coherent time, 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 based on the time-frequency measurement signal of integrated atomic time, the corrected time deviation data is the time deviation data after compensation by Coordinated Universal Time for the difference between the first common-view data and the second common-view data.

[0119] When the time-using terminal performs frequency tracing, it calculates the corrected frequency deviation data based on the first common view data and the second common view data, and sends the corrected frequency deviation data to the time-using terminal.

[0120] When the time-using terminal performs time and frequency tracing, it calculates corrected time deviation data and frequency deviation data based on the first common-view data and the second common-view data, and sends the corrected time deviation data and frequency deviation data to the time-using terminal. Among them, when the second common-view data is obtained by combining the time and frequency measurement signal of the local coordination time and the time and frequency measurement signal of the integrated atomic time, the corrected time deviation data is the difference between the first common-view data and the second common-view data obtained from the local coordination time, and the corrected frequency deviation data is the frequency deviation data obtained by weighted averaging the difference between the first common-view data and the second common-view data obtained from the local coordination time and the difference between the first common-view data and the second common-view data obtained from the integrated atomic time.

[0121] Step S1103: The time terminal calibrates the local time and frequency signal based on the corrected time deviation data and / or frequency deviation data.

[0122] After receiving the corrected time deviation data and / or frequency deviation data, the time terminal calibrates the local time and frequency signal, thereby improving the stability and accuracy of the local time and frequency signal and reducing the time deviation of the time terminal relative to UTC.

[0123] In one possible implementation, there are at least two timekeeping units, with the timekeeping unit providing local coordination and the timekeeping unit providing integrated atoms located in different locations.

[0124] In one possible implementation, the timekeeping unit includes a clock array for providing local Coordinated Time and / or integrated atomic time, the clock array including at least one optical clock and / or at least one fountain clock.

[0125] In one possible implementation, the first and second common-view data include transmission time interval adjustment data, which represents the acquisition interval between time deviation data in the common-view data. The transmission time interval adjustment data can be any time interval, such as any time interval between 1 second and 1 day.

[0126] Since the local Coordinated Time (UTC(k)) has been artificially intervened / adjusted, its frequency characteristics have become less predictable. Using Integrated Atomic Time (TA(k)) will improve the frequency stability and accuracy of the atomic clock at the time-using terminal and reduce the time deviation of the time-using terminal relative to Coordinated Universal Time (UTC).

[0127] The time terminal is simultaneously controlled by two time scales, UTC(k) and TA(k), with redundancy and mutual backup, which improves reliability.

[0128] When the performance of the frequency source B of the time-using terminal is similar to or better than that of the TA(k) reference atomic clock A, using TA(k) to drive it can better bring out the performance of the frequency source B, making the time scale generated by the frequency source B equivalent to or better than that generated by the atomic clock A.

[0129] The source of TA(k) is the second length reference. If the time terminal introduces TA(k) as an accurate frequency reference to control the local atomic time scale, its frequency can be made more accurate and stable, which is equivalent to the second definition being reproduced in the time terminal.

[0130] TA(k) is generated by clockwork, resulting in stronger frequency stability and making it more suitable as a reference for evaluating the frequency characteristics of the time terminal frequency source.

[0131] TA(k) facilitates the tracing of time from the terminal to UTC, making it suitable for international cooperation. The purpose of TA(k) is to reproduce the definition of the second. If a time terminal uses TA(k) as an accurate frequency reference to control the frequency of its local frequency source (atomic clock or crystal oscillator), the obtained frequency can be more accurate and stable. Furthermore, when either UTC(k) / BDS / GPS or TA(k) is temporarily interrupted or has no signal, the other can provide redundancy, improving reliability. Since TA(k) can be transmitted in terms of time and frequency using common-view methods such as GNSS, the generation of TA(k) and UTC(k) / BDS / GPS does not need to be in the same location. BDS / GPS refers to the GNSS satellite positioning system.

[0132] The following detailed explanation of the specific steps for tracing the time frequency of a time-using terminal, using a concrete example:

[0133] Step a) When the time terminal relies solely on satellite measurement data (BDS / GPS) for time and frequency tracing, a set of time differences with BDS / GPS can be obtained through the common-view data (CGGTTS file) generated by the GNSS receiver. The relative frequency deviation of the time terminal is calculated using the "two-point time difference method" or "fitting method" based on this time difference data. This method can be completed only on the time terminal.

[0134] Step b) When the time-using terminal relies on BDS / GPS for time tracing and UTC(k) for frequency tracing, it sends the common-view data (CGGTTS file) generated by the GNSS receiver to the time-keeping unit via a protocol. The time-keeping unit subtracts a set of common-view data from the time-using terminal and a set of common-view data from UTC(k) to obtain a set of time difference data between the time-using terminal and UTC(k). The time difference data is then used to calculate the relative frequency deviation of the time-using terminal using the "two-point time difference method" or the "fitting method". The time-keeping unit returns the relative frequency deviation to the time-using terminal via a protocol.

[0135] Step c) When the time-using terminal relies on BDS / GPS for time tracing and TA(k) for frequency tracing, it sends the common-view data (CGGTTS file) generated by the GNSS receiver to the time-keeping unit via a protocol. The time-keeping unit subtracts a set of common-view data from the time-using terminal and a set of common-view data from TA(k) to obtain a set of time difference data between the time-using terminal and TA(k). The time difference data is then used to calculate the relative frequency deviation of the time-using terminal using the "two-point time difference method" or the "fitting method". The time-keeping unit returns the relative frequency deviation to the time-using terminal via a protocol.

[0136] Step d) When the time-using terminal relies solely on UTC(k) for time and frequency tracing, it sends the common-view data (CGGTTS file) generated by the GNSS receiver to the time-keeping unit via a protocol. The time-keeping unit subtracts a set of common-view data from the time-using terminal and a set of common-view data from UTC(k) to obtain a set of time difference data between the time-using terminal and UTC(k). This time difference data can be directly used as the time difference data returned to the time-using terminal. The relative frequency deviation of the time-using terminal is calculated using the "two-point time difference method" or "fitting method" based on this time difference data. The time-keeping unit returns this time difference and relative frequency deviation to the time-using terminal via a protocol.

[0137] Step e) When the time-using terminal relies solely on TA(k) for time and frequency tracing, it sends the common-view data (CGGTTS file) generated by the GNSS receiver to the time-keeping unit via a protocol. The time-keeping unit subtracts a set of common-view data from the time-using terminal and a set of common-view data from TA(k) to obtain a set of time difference data between the time-using terminal and TA(k). The time difference data is then used to calculate the relative frequency deviation of the time-using terminal using the "two-point time difference method" or "fitting method". The time-keeping unit returns the relative frequency deviation and the time difference after compensation with UTC to the time-using terminal via a protocol.

[0138] Step f) When the time-using terminal relies on UTC(k) and TA(k) for time and frequency tracing, redundancy and mutual backup are achieved, and the two time scales are combined to improve reliability. The common-view data (CGGTTS file) generated by the GNSS receiver is sent to the time-keeping unit via the protocol. The time-keeping unit subtracts a set of common-view data from the time-using terminal and a set of common-view data from UTC(k) to obtain a set of time difference data between the time-using terminal and UTC(k). The relative frequency deviation f1 between the time-using terminal and UTC(k) is calculated using the "two-point time difference method" or "fitting method" on this time difference data. The time-keeping unit then subtracts the same set of common-view data from the time-using terminal and a set of common-view data from TA(k) to obtain a set of time difference data between the time-using terminal and TA(k). The relative frequency deviation f2 between the time-using terminal and TA(k) is calculated using the "two-point time difference method" or "fitting method" on this time difference data. A weighted average of f1 and f2 is then obtained.

[0139]

[0140] The timekeeping unit returns the time difference between the user terminal and UTC(k) and f to the time-using terminal through a protocol; if TA(k) is controlled by an optical clock or a cesium atomic fountain clock, the process of tracing the frequency of the time-using terminal back to TA(k) is to transmit the definition of the second to the time-using terminal, and the frequency of the time-using terminal is highly accurate and stable.

[0141] Figure 12 A schematic diagram of a time calibration system based on common-view data provided in an embodiment of the present invention is shown below. Figure 12 As shown, the time calibration system based on common-view data provided in this embodiment includes: a time-using terminal and a time-keeping unit.

[0142] The timing terminal includes a first receiver and a terminal node. The first receiver receives satellite measurement data and time-frequency measurement signals from the local timekeeping structure of the terminal node, and calculates the time deviation data and / or frequency deviation data between the satellite measurement data and the time-frequency signals from the local timekeeping structure of the timing terminal, which are used as first common-view data. The terminal node is used to send the first common-view data to the timekeeping unit.

[0143] The timekeeping unit includes a second receiver and a clock array. The second receiver is used to receive satellite measurement data and time-frequency measurement signals from the clock array, calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the local time-frequency measurement signals as second common-view data, and calculate the corrected time deviation data and / or frequency deviation data based on the first common-view data and the second common-view data, and send the corrected time deviation data and / or frequency deviation data to the time-using terminal.

[0144] The terminal node is also used to calibrate the local time-frequency signal based on the corrected time deviation data and / or frequency deviation data.

[0145] like Figure 12 As shown, the time-using terminal inputs its local second pulse and frequency signal to the receiver and receives the common-view data output by the receiver. It then sends this common-view data to the timekeeping unit. The timekeeping unit inputs its local second pulse and frequency signal to the receiver and receives the common-view data output by the receiver. The timekeeping unit calculates the time difference and frequency difference between the time-using terminal and the timekeeping unit, and finally returns the time difference and frequency difference data to the time-using terminal through a protocol. The time-using terminal corrects its local time and frequency based on this time difference and frequency difference data, thus achieving remote calibration.

[0146] The time of the time-using terminal can be traced through a GNSS receiver from TA(k) / UTC(k) / BDS / GPS. Specifically, this can be achieved by directly receiving radio signals broadcast by BDS / GPS and then demodulating and decoding them; alternatively, it can be compared with UTC(k) using the GNSS common-view method. The time-using terminal sends the common-view data (CGGTTS file) to the data processing and information dissemination platform via a protocol, and the platform calculates the time difference between the user and UTC(k), and finally returns the time difference data to the time-using terminal via a protocol; alternatively, it can be compared with TA(k) using the GNSS common-view method. The time difference generated by the comparison needs to be compensated by the data processing and information dissemination platform with UTC, and finally the compensated time difference data is returned to the time-using terminal via a protocol.

[0147] The frequency tracing of the time-using terminal involves generating common-view data via a GNSS receiver, encapsulating it according to a protocol, and sending it to a data processing and information dissemination platform. The platform calculates the frequency deviation between the user and TA(k), and finally returns the frequency deviation data to the time-using terminal via a protocol, thus enabling the time-using terminal's frequency to approach TA(k). When the frequency deviation between the user and TA(k) cannot be obtained, UTC(k) / BDS / GPS can be used instead of TA(k) for frequency deviation calculation.

[0148] If UTC(k) and TA(k) can be located in the same place, then only one data processing and information publishing platform needs to be deployed, such as... Figure 12 As shown. UTC(k) and TA(k) may not be located in the same location. Timekeeping terminals are compared with them using the GNSS common-view method. Therefore, the data processing and information dissemination platform can be deployed separately in the timekeeping units where UTC(k) and TA(k) are located, such as... Figure 13 As shown, Figure 13 This is a schematic diagram of another time calibration system based on common-view data provided in an embodiment of the present invention.

[0149] The data processing and information dissemination platform receives common-view data from time-using terminals via a protocol. This data is used to calculate time differences and relative frequency deviations with UTC(k), multiple atomic clocks, and TA(k). The platform stores and displays this time difference and relative frequency deviation data and returns it to the time-using terminals via the protocol. The platform periodically analyzes the time difference and relative frequency deviation data of the time-using terminals (long-term time and frequency range, frequency stability, and relative frequency deviation) to achieve monitoring objectives. Simultaneously, it incorporates atomic clock data from each time-using terminal (the time difference between the atomic clock and TA(k)) into the TA(k) calculation, increasing the number of atomic clocks involved in the TA(k) calculation. Furthermore, the platform collects common-view data from UTC(k) and TA(k), the time difference between each atomic clock of the timekeeping unit and UTC(k), and the time difference between each atomic clock and TA(k).

[0150] The frequency tracing of the time-using terminal involves generating common-view data via a GNSS receiver, encapsulating it according to a protocol, and sending it to a data processing and information dissemination platform. The platform calculates the frequency deviation between the user and TA(k), and finally returns the frequency deviation data to the time-using terminal via a protocol, thus enabling the time-using terminal's frequency to approach TA(k). When the frequency deviation between the user and TA(k) cannot be obtained, UTC(k) / BDS / GPS can be used instead of TA(k) for frequency deviation calculation. If UTC(k) and TA(k) are located in the same location, only one data processing and information dissemination platform needs to be deployed.

[0151] As one implementation method, UTC(k) and TA(k) may not be located in the same place. User terminals are compared with them by GNSS common-view method. Therefore, the data processing and information release platform can be set up in the laboratory where UTC(k) and TA(k) are located respectively.

[0152] Once the time and frequency of the time-using terminals are traced, a time-using terminal monitoring center can be established to exchange data on the time and frequency of each time-using terminal according to the needs of the time-using unit, thereby achieving the purpose of monitoring the time and frequency of each time-using terminal within the time-using unit.

[0153] Specifically, punctuality units include clock sets.

[0154] Specifically, the clock array provides local coordinated time or integrated atomic time. Preferably, the clock array includes at least one optical clock. Preferably, the clock array includes at least one fountain clock.

[0155] Specifically, timekeeping units may include at least two. Preferably, each timekeeping unit provides both local Coordinated Time (UTC) and synthetic atomic time (SAT). Preferably, each timekeeping unit provides at least either local UTC or SAT. Preferably, at least one timekeeping unit provides SAT and at least one timekeeping unit provides local UTC.

[0156] Specifically, the user terminal includes a terminal node. The terminal node outputs a frequency and / or a second pulse.

[0157] Specifically, punctuality units and time-using terminals communicate and / or exchange data through protocols.

[0158] Preferably, the protocol includes at least one of time difference, frequency difference, ID, and common-view data.

[0159] Preferably, the protocol includes at least time difference, frequency difference, and common-view data.

[0160] Specifically, the time-use terminal monitoring center interacts with the time-use terminals.

[0161] Embodiments of the present invention also include a time-use terminal, comprising: a receiver and a terminal node; wherein the receiver includes, for example, a time-use terminal. Figure 4 The receiver in the illustrated embodiment. The terminal node is used to send common-view data calculated by the receiver to the timekeeping unit, and to receive corrected time offset data and / or frequency offset data sent by the timekeeping unit, and to calibrate the local time-frequency signal based on the corrected time offset data and / or frequency offset data. Optionally, the timekeeping terminal includes a mirror atomic clock for providing the local time-frequency signal.

[0162] Specifically, the timing terminal provided in this embodiment of the invention includes common-view data, and performs weighted calculation on the same or different types of time deviations and / or frequency deviations contained in the common-view data.

[0163] As one implementation, the user terminal further includes a mirrored atomic clock.

[0164] Preferably, when the time-using terminal relies on UTC(k) and TA(k) for time and frequency tracing, redundancy and mutual backup are achieved, and the integration of two time scales improves reliability. The common-view data (CGGTTS file) generated by the GNSS receiver is sent to the time-keeping unit via a protocol. The time-keeping unit subtracts a set of common-view data from the time-using terminal from at least one set of common-view data from UTC(k) to obtain the time difference data between the time-using terminal and at least one set of UTC(k). The relative frequency deviation f between the time-using terminal and UTC(k) is calculated using the "two-point time difference method" or "fitting method" based on this time difference data. i .

[0165] The timekeeping unit then subtracts the common viewing data of the same set of timekeeping terminals from the common viewing data of at least one set of TA(k) to obtain the time difference data between the timekeeping terminal and at least one set of TA(k). This time difference data is then used to calculate the relative frequency deviation f between the timekeeping terminal and TA(k) using either the "two-point time difference method" or the "fitting method". j For at least f i and at least one f j The weighted average is used to obtain f, and the time difference between the user terminal and UTC(k) and f are returned to the time-using terminal through the protocol.

[0166] The calculation of ω weights can optionally use UTC to evaluate the time stability, frequency stability, relative frequency deviation, and time frequency difference of UTC(k) and TA(k), and comprehensively select the time stability, frequency stability, relative frequency deviation, and time frequency difference indicators to allocate weights; alternatively, an optical clock can be used to evaluate the time stability, frequency stability, relative frequency deviation, and time frequency difference of UTC(k) and TA(k), and comprehensively select the time stability, frequency stability, relative frequency deviation, and time frequency difference indicators to allocate weights.

[0167] The sum of the weights of UTC(k) and TA(k) is 1.

[0168] The standard time output signal is evaluated using two technical indicators: 1) time accuracy and 2) frequency accuracy. The emphasis is usually different depending on the purpose of use, and the weighting method is determined according to the purpose of use.

[0169] This invention also provides a timestamp generation method, comprising: acquiring a calibrated time-frequency signal using a time-using terminal provided in this invention; providing time synchronization to a timestamp server based on the calibrated time-frequency signal; and affixing a timestamp.

[0170] A timestamp is a complete and verifiable piece of data that existed before a specific time. A timestamp system is a trusted third party that generates timestamps. Timestamp systems can be provided as a component of a digital certificate authentication system or as a standalone service. Timestamps are widely used in intellectual property protection, contract signing, financial accounting, electronic bidding, stock trading, wills or other declarations, and personal document management. In particular, the formal promulgation of my country's "Electronic Signature Law" has given electronic signatures legal validity, granting them the same status as physical signatures, and timestamp services play a crucial role in electronic signatures.

[0171] Transmitting the terminal time, processed by UTC(k) and TA(k), to the timestamp server can improve the timestamp server's time resolution, more precisely distinguish the order of stamped data, and enhance the server's service capabilities. For example... Figure 14 As shown, Figure 14 This is a schematic diagram illustrating the application of the timestamp generation method provided in this embodiment of the invention.

[0172] This invention also provides a data mining method, comprising: acquiring a calibrated time-frequency signal using a time-time terminal provided in this invention; and providing time synchronization to multiple data mining servers based on the calibrated time-frequency signal, so that the multiple data mining servers can complete accurate sorting and / or filtering of data based on the calibrated time-frequency signal.

[0173] In fields such as the Internet of Things, finance, and transportation, the demand for intelligent technologies such as big data and artificial intelligence is becoming increasingly widespread. The resulting challenge is how to accurately sort and filter massive amounts of data, which is crucial for subsequent data mining and analysis. Extracting valuable information can help guide the development of various industries.

[0174] Time is a key dimension in data analysis. Currently, the time discrepancies of large amounts of data generated from multiple locations are not quantified, and there is a lack of reliable experimental data to support time synchronization, as well as corresponding safeguards. In particular, the lack of performance monitoring methods is a significant issue when dealing with large distances, inconsistent synchronization times, different types of equipment, and long-term continuous operation. The widely adopted one-way time synchronization method cannot meet the quantifiable time synchronization requirements.

[0175] like Figure 15 As shown, Figure 15This is a schematic diagram illustrating the application of the data mining method provided in this embodiment of the invention. Through the time-frequency transmission technology of this scheme, the time-using terminal can possess highly accurate, stable, and reliable time, enabling various business logics and data to be accurately labeled with this time. This provides strong support for big data analysis and artificial intelligence, improving the accuracy and effectiveness of auxiliary decision-making.

[0176] It should be noted that the functional units / modules in the various embodiments of the present invention can be integrated into one processing unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated into one unit / module. The integrated unit / module described above can be implemented in hardware or in the form of software functional units / modules.

[0177] From the above description of the embodiments, those skilled in the art will clearly understand that the embodiments described herein can be implemented in hardware, software, firmware, middleware, code, or any suitable combination thereof. For hardware implementation, the processor can be implemented in one or more of the following units: Application-Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), processor, controller, microcontroller, microprocessor, other electronic units designed to implement the functions described herein, or combinations thereof. For software implementation, some or all of the processes of the embodiments can be implemented by a computer program instructing the associated hardware. During implementation, the program can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of a computer program from one place to another. Storage media can be any available medium accessible to a computer. 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 capable of carrying or storing desired program code having the form of instructions or data structures and accessible to a computer.

[0178] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for generating shared-view data, characterized in that, include: Receive satellite measurement data; Obtain the virtual time-frequency measurement signal provided by the mirror atomic clock; Calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the virtual time-frequency measurement signal provided by the mirror atomic clock, and use this as common-view data.

2. A receiver, characterized in that, include: Satellite signal receiving unit, used to receive satellite measurement data; The local signal acquisition unit is used to acquire the virtual time and frequency measurement signal provided by the mirror atomic clock; The data generation module is used to calculate the time deviation data and / or frequency deviation data between the satellite measurement data and the virtual time and frequency measurement signal provided by the mirror atomic clock.

3. A calibration method, characterized in that, The timekeeping unit transmits the common-view data to the time-using terminal via a protocol and performs time and / or frequency calibration. The common-view data is generated according to the common-view data generation method described in claim 1.

4. A time calibration system, characterized in that, include: At least one time-using terminal and at least one time-keeping unit; The at least one time-using terminal receives common-view data sent by the timekeeping unit through a protocol to perform time and / or frequency calibration; The at least one time-using terminal and the at least one time-keeping unit include the receiver as described in claim 2.

5. A time-use terminal, characterized in that, Includes the receiver and terminal node as described in claim 2; The terminal node is used to send common-view data calculated by the receiver to the timekeeping unit, receive corrected time deviation data and / or frequency deviation data sent by the timekeeping unit, and calibrate the local time and frequency signal according to the corrected time deviation data and / or frequency deviation data.

6. A timestamp generation method, characterized in that, include: The time-using terminal receives common-view data sent by the time-keeping unit through a protocol to perform time and / or frequency calibration, and the time-using terminal includes the time-using terminal as described in claim 5; The time and frequency signals are used to provide time synchronization to the timestamp server and then timestamp the data.

7. A data mining method, characterized in that, include: The time-using terminal receives common-view data sent by the time-keeping unit through a protocol to perform time and / or frequency calibration, and the time-using terminal includes the time-using terminal as described in claim 5; The calibrated time-frequency signal is used to provide timing for multiple data mining servers, enabling the multiple data mining servers to perform accurate sorting and / or filtering of data based on the calibrated time-frequency signal.

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