CN116722945A - Satellite-to-ground time synchronization method and device for conducting fusion and electronic equipment - Google Patents
Satellite-to-ground time synchronization method and device for conducting fusion and electronic equipment Download PDFInfo
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- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
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Abstract
The application provides a satellite-to-ground time synchronization method and device for conducting fusion and electronic equipment, wherein the method comprises the following steps: measuring the initial accuracy of the frequency of the in-orbit satellite; the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator; based on the measurement result of the initial accuracy of the frequency, the initial frequency of the satellite is calibrated, and the frequency accuracy of the satellite is adjusted to 10 ‑13 Magnitude of magnitude; based on the measurement result of satellite-ground clock difference, calibrating the initial phase of the satellite, and adjusting the initial phase of the satellite to ensure that the deviation between the initial phase of the satellite and the absolute time of the ground operation control center is within +/-50 ns; judging whether the drift value of the star-to-ground clock difference exceeds a threshold value; the frequency of the satellite is adjusted when the satellite clock and the drift value of the satellite clock exceed a threshold value. The application can ensure that the deviation of the absolute time between the 1PPS generated by the satellite and the ground operation control center is within +/-50 ns and stable, and realizes the common time-frequency reference of the communication fusion signal.
Description
Technical Field
The application mainly relates to the technical field of conducting fusion of low-orbit satellites, in particular to a satellite-to-ground time synchronization method and device for conducting fusion and electronic equipment.
Background
A communication satellite is an artificial earth satellite used as a radio communication relay station in space, which is a space part of a satellite communication system for forwarding or processing radio communication signals to enable communication between earth stations (including handset terminals) or between a spacecraft and an earth station. A navigation satellite is a satellite vehicle for providing wireless navigation signals and navigation information, which provides navigation, positioning and timing services to users. The navigation satellite system has high positioning precision and wide service range, can provide all-day, all-weather and continuous navigation positioning service, becomes a national important infrastructure in the space-time positioning field, and is an important support for the national status and strategic interests.
In recent years, as the demands of users for wider coverage, higher efficiency and higher precision are becoming stronger, low-orbit satellite constellations gradually become an important direction of satellite communication and satellite navigation development. The navigation and communication fusion can reduce the repeated construction of the low-orbit constellation, save construction cost, and promote the service capability of users by mutual energization, so that the navigation and communication fusion system becomes a research hotspot of the low-orbit constellation.
Referring to fig. 1 to 6, the entire satellite time-frequency integration is required by the communication fusion system, but the requirements of communication and navigation on time-frequency are different. High-precision satellite-to-ground broadband communication requires that the deviation between 1PPS (Pulse Per Second) and ground time of a satellite is within +/-50 ns, and no requirement is made on the stationarity of the 1PPS, but the navigation-enhanced 1PPS requirement is as stable as possible, and the deviation between the satellite-to-ground broadband communication and the ground time is acceptable within +/-1 ms. This results in that the conventional communication time synchronization mechanism based on GNSS (Global Navigation Satellite System ) or the navigation time synchronization mechanism based on atomic clock which is not adjusted for a long time cannot meet the requirement of uniform time and frequency of communication signals and navigation signals under the system of the communication and navigation fusion.
Disclosure of Invention
The application aims to solve the technical problem of providing a satellite-to-ground time synchronization method, a device and electronic equipment for communication and navigation fusion, which are used for solving the problems that the requirements of communication and navigation in a communication and navigation fusion system on satellite 1PPS are inconsistent, and the communication signals and the navigation signals cannot share the whole satellite time frequency, so that the fusion broadcasting and using of the communication signals and the navigation signals cannot be really realized.
In order to solve the technical problem, in a first aspect, the present application provides a satellite-to-ground time synchronization method for conducting fusion, including: measuring the initial accuracy of the frequency of the in-orbit satellite; wherein the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator; based on the measurement result of the initial accuracy of the frequency, calibrating the initial frequency of the satellite, and adjusting the frequency accuracy of the satellite to 10 -13 Magnitude of magnitude; based on the measurement result of satellite-ground clock difference, calibrating the initial phase of the satellite, and adjusting the initial phase of the satellite to ensure that the deviation between the initial phase of the satellite and the absolute time of a ground operation control center is within +/-50 ns; judging whether the star-to-ground clock difference and the drift value of the star-to-ground clock difference exceed a threshold value or not; and adjusting the frequency of the satellite when the satellite clock difference and the drift value of the satellite clock difference exceed a threshold value.
Optionally, measuring the initial accuracy of the frequency of the in-orbit satellite comprises: and comprehensively calculating the initial accuracy of the frequency of the satellite according to the navigation enhancement L-band emission signal measured value, the GNSS monitoring data, the satellite-ground ranging data and the inter-satellite ranging data.
Optionally, adjusting the frequency of the satellite includes: the magnitude of each adjustment to the frequency of the satellite is 10 -11 The frequency adjustment is below the Hz magnitude, and the positioning time service precision and the normal communication of the communication load of the ground user are not affected.
Optionally, the method further comprises: and waiting for the next judging period to continue the threshold judgment under the condition that the star clock difference and the drift value of the star clock difference do not exceed the threshold.
Optionally, when the method is in the ground control mode, the satellite is provided with an above-ground frequency modulation parameter, and the satellite adjusts the frequency of the satellite according to the above-ground frequency modulation parameter.
Optionally, when the method is in the satellite autonomous control mode, the ground annotates the calculated satellite clock difference to the satellite, and the satellite executes the satellite-to-ground time synchronization method for conducting fusion according to the satellite clock difference measurement result of the earth annotating.
Optionally, the method further comprises: and monitoring and evaluating the benefit of the satellite for adjusting the frequency of the satellite, and sending an alarm if the satellite fails to perform frequency modulation and the satellite phase difference is increased.
In a second aspect, the present application provides a satellite-to-ground time synchronization device for conducting fusion, including: the measuring module is used for measuring the initial accuracy of the frequency of the in-orbit satellite; wherein the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator; a first calibration module for calibrating the initial frequency of the satellite based on the measurement result of the initial accuracy of the frequency, and adjusting the accuracy of the frequency of the satellite to 10 -13 Magnitude of magnitude; a second calibration module for calibrating the initial phase of the satellite based on the measurement result of the satellite-to-ground clock difference, and adjusting the initial phase of the satellite to a deviation from the absolute time of the ground operation centerWithin + -50 ns; the judging module is used for judging whether the star-to-ground clock difference and the drift value of the star-to-ground clock difference exceed a threshold value or not; and the adjusting module is used for adjusting the frequency of the satellite under the condition that the satellite-to-ground clock difference and the drift value of the satellite-to-ground clock difference exceed a threshold value.
In a third aspect, the present application provides an electronic device, comprising: a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the satellite-to-ground time synchronization method for conducting fusion as described in the first aspect.
In a fourth aspect, the present application provides a readable storage medium having stored thereon a program or instructions which when executed by a processor performs the steps of the satellite-to-ground time synchronization method for conducting fusion as described in the first aspect.
Compared with the prior art, the application has the following advantages: the method comprises the steps of measuring the initial accuracy of the frequency of an in-orbit satellite, calibrating the initial frequency of the satellite based on the measurement result of the initial accuracy of the frequency, and adjusting the accuracy of the frequency of the satellite to 10 -13 And finally, under the condition that the drift values of the satellite-to-ground clock difference and the satellite-to-ground clock difference exceed the threshold value, the frequency of the satellite is adjusted, so that the deviation of the absolute time of 1PPS generated by the satellite and the ground operation center is ensured to be within +/-50 ns and stable, and the common time-frequency reference of the common conduction fusion signal is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the accompanying drawings:
FIG. 1 is a schematic flow chart of the low orbit satellite navigation fusion in the application;
FIG. 2 is a schematic flow chart of the navigation enhancement load in the present application;
FIG. 3 is a schematic flow chart of the integrated processing load in the present application;
FIG. 4 is a schematic flow chart of the laser load in the present application;
FIG. 5 is a schematic flow chart of the feed load in the present application;
FIG. 6 is a schematic flow chart of Ka load in the present application;
FIG. 7 is a flowchart of a satellite-to-ground time synchronization method for conducting fusion according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a satellite-to-ground time synchronization apparatus for conducting fusion according to an embodiment of the present application;
fig. 9 is a schematic diagram of an electronic device according to an embodiment of the application.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is apparent to those of ordinary skill in the art that the present application may be applied to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.
As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.
A flowchart is used in the present application to describe the operations performed by a system according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in order precisely. Rather, the various steps may be processed in reverse order or simultaneously. At the same time, other operations are added to or removed from these processes.
Example 1
According to the embodiment, the difference of the communication load and the navigation load on the use requirement of 1PPS is comprehensively considered, and the satellite-to-ground time synchronization mechanism under the condition of communication and navigation fusion is searched, so that the satellite time frequency after satellite-to-ground time synchronization can meet the small deviation requirement of communication and can also meet the high precision of navigation enhancement. Fig. 7 is a flowchart of a satellite-to-ground time synchronization method for conducting fusion according to an embodiment of the present application, and referring to fig. 7, a method 700 is shown mainly for a low-orbit satellite, and other satellite control processes capable of executing the method may be also suitable, including:
s710, measuring the initial accuracy of the frequency of the in-orbit satellite; wherein the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator.
In this embodiment, the initial accuracy measurement of the frequency of the in-orbit satellite is needed to know the current frequency of the satellite, so as to determine whether the frequency of the satellite needs to be adjusted and how to adjust.
Considering the difference in the use requirements of the communication load and the navigation load for 1PPS, the drift of the satellite 1PPS is mainly affected by the accuracy of the atomic clock in a short period, and the accuracy is mainly affected by the short-term stability of the atomic clock in a short period. For example, in this embodiment, the satellites may be configured with a small rubidium clock and a high-stability crystal oscillator, where the frequencies of the two frequencies are adjusted differently, and the frequency of the adjustment of the high-stability crystal oscillator is higher.
In some embodiments, measuring the frequency initial accuracy of the in-orbit satellites may be calculating the frequency initial accuracy of the satellites from navigation-enhanced L-band transmit signal measurements, GNSS monitoring data, satellite-to-ground ranging data, and inter-satellite ranging data.
S720, calibrating the initial frequency of the satellite based on the measurement result of the initial accuracy of the frequency, and adjusting the accuracy of the frequency of the satellite to 10 -13 Magnitude.
In the present embodiment, the initial frequency of the satellite is calibrated, and the frequency accuracy of the satellite is adjusted to 10 -13 The magnitude can further meet the requirement of satellite frequency accuracy, and the requirement of small-step adjustment of satellite frequency in the embodiment can also be realized, so that time-frequency high-precision control can be realized. The satellite can adopt an all-digital time-frequency scheme, high-precision control on the satellite time frequency can be realized in a small-step frequency adjustment mode, and the ground user communication service precision can be guaranteed not to be influenced.
And S730, calibrating the initial phase of the satellite based on the measurement result of the satellite-ground clock difference, and adjusting the initial phase of the satellite to the deviation of absolute time from the ground operation control center within +/-50 ns.
In this embodiment, since the satellite-to-ground broadband communication with high accuracy requires that the satellite 1PPS and the ground time deviate within ±50ns, the initial phase of the satellite is adjusted to within ±50ns of the absolute time of the ground operation center.
S740, judging whether the star clock difference and the drift value of the star clock difference exceed a threshold value.
In this embodiment, it is determined whether the star clock and the drift value of the star clock exceed a threshold, where the magnitude of the threshold may be controlled by a parameter. The satellite is frequency adjusted only when the satellite clock and the drift value of the satellite clock exceed a threshold value. Of course, in the case where the satellite-to-ground clock and the drift value of the satellite-to-ground clock do not exceed the threshold, no frequency adjustment is required for the satellite. For example, in the case that the satellite clock difference and the drift value of the satellite clock difference do not exceed the threshold value, the satellite does not need to be subjected to frequency adjustment, and the next judging period can be waited for to continue to carry out threshold value judgment.
And S750, adjusting the frequency of the satellite when the satellite clock difference and the drift value of the satellite clock difference exceed a threshold value.
In some embodiments, the adjustment to the frequency of the satellite may be on the order of 10 for each adjustment to the frequency of the satellite -11 The Hz magnitude, and the frequency adjustment does not affect the positioning time service precision of the ground user and the normal communication of the communication load. For example, the adjustment amount and the adjustment frequency of the satellite frequency may have two modes of ground control and on-board autonomous control, and the switching between the two modes may be controlled by a control instruction.
In some embodiments, when the frequency adjustment method in this embodiment is in the ground control mode, the satellite may be injected with the frequency modulation parameter on the ground, and the satellite adjusts the frequency of the satellite according to the frequency modulation parameter injected on the ground. When the frequency adjustment method in this embodiment is in the satellite autonomous control mode, the satellite may be ground to upload the calculated satellite clock difference to the satellite, and the satellite may execute the satellite-to-ground time synchronization method for conducting fusion according to the satellite clock difference measurement result of ground upload. It can be seen that the present embodiment has the capability of switching between ground control and on-board autonomous control. The satellite has an autonomous time-frequency control switch, can be switched to ground instruction control, also has the satellite autonomous control capability, and the ground can control the turning-off and the turning-on of the satellite autonomous frequency modulation mode through the uploading instruction.
In some embodiments, the benefits of the satellite self-adjusting to the frequency of the satellite are monitored and assessed, and an alarm is issued if the satellite fails to perform frequency modulation, resulting in an increase in the phase difference across the satellite.
The method of the embodiment realizes the common time-frequency reference of the communication and navigation signals, can also realize the high-precision 10MHz frequency and 1PPS reference of the common navigation enhancement load of the communication and navigation signals, ensures the feasibility of the common-channel fusion signal at the time-frequency level, and reduces the time-frequency complexity of satellites.
According to the satellite-ground time synchronization method for conducting fusion, the initial frequency of the satellite is calibrated according to the measurement result of the initial frequency accuracy by measuring the initial frequency accuracy of the in-orbit satellite, and the frequency accuracy of the satellite is adjusted to 10 -13 And finally, under the condition that the drift values of the satellite-to-ground clock difference and the satellite-to-ground clock difference exceed the threshold value, the frequency of the satellite is adjusted, so that the deviation of the absolute time of 1PPS generated by the satellite and the ground operation center is ensured to be within +/-50 ns and stable, and the common time-frequency reference of the common conduction fusion signal is realized.
Meanwhile, the threshold value can be adjusted according to the ground instruction or the satellite can be adjusted autonomously according to the clock deviation rate.
Example two
Fig. 8 is a schematic structural diagram of a satellite-to-ground time synchronization apparatus for conducting fusion according to an embodiment of the present application, and referring to fig. 8, the apparatus 800 is mainly used for low-orbit satellites, and other satellite control processes capable of executing the method may be also suitable, and mainly includes:
a measurement module 801, configured to measure an initial accuracy of a frequency of an in-orbit satellite; wherein the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator.
In some embodiments, measuring the initial accuracy of the frequency of the in-orbit satellite comprises: and comprehensively calculating the frequency initial accuracy of the satellite according to the navigation enhancement L-band emission signal measured value, the GNSS monitoring data, the satellite-ground ranging data and the inter-satellite ranging data.
A first calibration module 802 for calibrating the initial frequency of the satellite based on the measurement result of the initial accuracy of the frequency, and adjusting the accuracy of the frequency of the satellite to10 -13 Magnitude.
And the second calibration module 803 is configured to calibrate an initial phase of the satellite based on a measurement result of the satellite-to-ground clock difference, and adjust the initial phase of the satellite to a deviation from an absolute time of a ground operation center within ±50ns.
A determining module 804, configured to determine whether the star clock and the drift value of the star clock exceed a threshold.
In some embodiments, when the star clock and the drift value of the star clock do not exceed the threshold, the next determination period is waited for to continue the threshold determination.
And an adjusting module 805, configured to adjust the frequency of the satellite when the satellite clock difference and the drift value of the satellite clock difference exceed a threshold value.
In some embodiments, adjusting the frequency of the satellite includes: the magnitude of each adjustment to the frequency of the satellite is 10 -11 The Hz magnitude, and the frequency adjustment does not affect the positioning time service precision of the ground user and the normal communication of the communication load.
In some embodiments, the satellite frequency adjustment is in a ground control mode, the ground is provided with a frequency modulation parameter, and the satellite adjusts the frequency of the satellite according to the ground provided frequency modulation parameter.
In some embodiments, the ground injects the calculated satellite earth clock into the satellite when the satellite frequency adjustment is in the satellite autonomous control mode, and the satellite performs the satellite frequency adjustment based on the earth clock measurements injected.
In some embodiments, the method further comprises monitoring and evaluating the benefit of the satellite for self-adjusting the frequency of the satellite, and sending out an alarm if the satellite fails to perform frequency modulation and the satellite phase difference is increased.
Reference may be made to the foregoing embodiments for details of other operations performed by the modules in this embodiment, which are not further described herein.
The satellite-ground time synchronization device for conducting fusion provided by the embodiment measures the initial accuracy of the frequency of the in-orbit satellite,based on the measurement result of the initial accuracy of the frequency, the initial frequency of the satellite is calibrated, and the frequency accuracy of the satellite is adjusted to 10 -13 And finally, under the condition that the drift values of the satellite-to-ground clock difference and the satellite-to-ground clock difference exceed the threshold value, the frequency of the satellite is adjusted, so that the deviation of the absolute time of 1PPS generated by the satellite and the ground operation center is ensured to be within +/-50 ns and stable, and the common time-frequency reference of the common conduction fusion signal is realized.
The satellite-to-ground time synchronization method device for conducting fusion in the embodiment of the application can be a device, and can also be a component, an integrated circuit or a chip in a terminal. The satellite-to-ground time synchronization method device for conducting fusion in the embodiment of the application can be a device with an operating system. The operating system may be an android operating system, an iOS operating system, or other possible operating systems, and the embodiment of the present application is not limited specifically.
The application also provides an electronic device, comprising: a memory for storing programs or instructions executable by the processor; and a processor, configured to execute the program or the instruction to implement each process of the satellite-to-ground time synchronization method embodiment for conducting fusion, and achieve the same technical effect, so that repetition is avoided, and details are not repeated here.
Fig. 9 is a schematic diagram of an electronic device according to an embodiment of the application. The electronic device 900 may include an internal communication bus 901, a Processor (Processor) 902, a Read Only Memory (ROM) 903, a Random Access Memory (RAM) 904, and a communication port 905. When applied to a personal computer, the electronic device 900 may also include a hard disk 906. Internal communication bus 901 may enable data communication between components of electronic device 900. The processor 902 may make the determination and issue a prompt. In some implementations, the processor 902 may be comprised of one or more processors. The communication port 905 may enable the electronic device 900 to communicate data with the outside. In some implementations, the electronic device 900 may send and receive information and data from a network through the communication port 905. The electronic device 900 may also include various forms of program storage elements and data storage elements such as hard disk 906, read Only Memory (ROM) 903, and Random Access Memory (RAM) 904, capable of storing various data files for computer processing and/or communication, as well as possible programs or instructions for execution by the processor 902. The results processed by the processor 902 are communicated to the user device via the communication port 905 for display on a user interface.
The above-described satellite-to-ground time synchronization method for guided fusion may be implemented as a computer program stored in the hard disk 906 and recorded into the processor 902 for execution to implement any of the satellite-to-ground time synchronization methods for guided fusion of the present application.
The embodiment of the application also provides a readable storage medium, and the readable storage medium stores a program or an instruction, which when executed by a processor, implements each process of the satellite-to-ground time synchronization method embodiment for conducting fusion, and can achieve the same technical effect, so that repetition is avoided, and no redundant description is provided herein.
The processor is a processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk.
The computer readable medium may comprise a propagated data signal with the computer program code embodied therein, for example, on a baseband or as part of a carrier wave. The propagated signal may take on a variety of forms, including electro-magnetic, optical, etc., or any suitable combination thereof. A computer readable medium can be any computer readable medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code located on a computer readable medium may be propagated through any suitable medium, including radio, cable, fiber optic cable, radio frequency signals, or the like, or a combination of any of the foregoing.
Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.
In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.
While the application has been described with reference to the specific embodiments presently, it will be appreciated by those skilled in the art that the foregoing embodiments are merely illustrative of the application, and various equivalent changes and substitutions may be made without departing from the spirit of the application, and therefore, all changes and modifications to the embodiments are intended to be within the scope of the appended claims.
Claims (10)
1. A satellite-to-ground time synchronization method for conducting fusion, comprising:
measuring the initial accuracy of the frequency of the in-orbit satellite; wherein the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator;
based on the measurement result of the initial accuracy of the frequency, calibrating the initial frequency of the satellite, and adjusting the frequency accuracy of the satellite to 10 -13 Magnitude of magnitude;
based on the measurement result of satellite-ground clock difference, calibrating the initial phase of the satellite, and adjusting the initial phase of the satellite to ensure that the deviation between the initial phase of the satellite and the absolute time of a ground operation control center is within +/-50 ns;
judging whether the star-to-ground clock difference and the drift value of the star-to-ground clock difference exceed a threshold value or not;
and adjusting the frequency of the satellite when the satellite clock difference and the drift value of the satellite clock difference exceed a threshold value.
2. The satellite-to-earth time synchronization method for guided fusion of claim 1, wherein measuring the initial accuracy of the frequency of the in-orbit satellite comprises:
and comprehensively calculating the initial accuracy of the frequency of the satellite according to the navigation enhancement L-band emission signal measured value, the GNSS monitoring data, the satellite-ground ranging data and the inter-satellite ranging data.
3. The satellite-to-earth time synchronization method for guided fusion of claim 1, wherein adjusting the frequency of the satellite comprises:
the magnitude of each adjustment to the frequency of the satellite is 10 -11 The frequency is lower than the Hz, and the frequency adjustment does not affect the positioning time service precision of the ground user and the normal communication of the communication load.
4. The satellite-to-ground time synchronization method for guided fusion of claim 1, further comprising:
and waiting for the next judging period to continue the threshold judgment under the condition that the star clock difference and the drift value of the star clock difference do not exceed the threshold.
5. The satellite-to-ground time synchronization method for guided fusion of claim 1, wherein the satellite is provided with an above-ground frequency modulation parameter when the method is in a ground control mode, and wherein the satellite adjusts the frequency of the satellite based on the above-ground frequency modulation parameter.
6. The satellite-to-earth time synchronization method for guided fusion of claim 1, wherein the satellite is ground-based to upload the calculated satellite-to-earth clock difference to the satellite when the method is in a satellite autonomous control mode, the satellite performing the satellite-to-earth time synchronization method for guided fusion based on the ground-based satellite-to-earth clock difference measurement.
7. The satellite-to-ground time synchronization method for guided fusion of claim 1, further comprising:
and monitoring and evaluating the benefit of the satellite for adjusting the frequency of the satellite, and sending an alarm if the satellite fails to perform frequency modulation and the satellite phase difference is increased.
8. A satellite-to-ground time synchronization device for conducting fusion, comprising:
the measuring module is used for measuring the initial accuracy of the frequency of the in-orbit satellite; wherein the frequency of the satellite is generated by a small rubidium clock or a high-stability crystal oscillator;
a first calibration module for calibrating the initial frequency of the satellite based on the measurement result of the initial accuracy of the frequency, and adjusting the accuracy of the frequency of the satellite to 10 -13 Magnitude of magnitude;
the second calibration module is used for calibrating the initial phase of the satellite based on the measurement result of the satellite-to-ground clock difference, and adjusting the initial phase of the satellite to the deviation of absolute time of the ground operation control center within +/-50 ns;
the judging module is used for judging whether the star-to-ground clock difference and the drift value of the star-to-ground clock difference exceed a threshold value or not;
and the adjusting module is used for adjusting the frequency of the satellite under the condition that the satellite-to-ground clock difference and the drift value of the satellite-to-ground clock difference exceed a threshold value.
9. An electronic device, comprising: a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the satellite-to-ground time synchronization method for guided fusion as claimed in any one of claims 1 to 7.
10. A readable storage medium, wherein a program or instructions is stored on the readable storage medium, which when executed by a processor, implements the steps of the satellite-to-ground time synchronization method for guided fusion according to any one of claims 1-7.
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| CN113992296A (en) * | 2021-11-12 | 2022-01-28 | 中国电力科学研究院有限公司 | Clock disciplining method, time code monitoring device and time synchronization system |
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| CN113992296A (en) * | 2021-11-12 | 2022-01-28 | 中国电力科学研究院有限公司 | Clock disciplining method, time code monitoring device and time synchronization system |
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