CN109085616B - Satellite time service method, device and storage medium - Google Patents
Satellite time service method, device and storage medium Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
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Abstract
The invention provides a satellite time service method, a device and a storage medium, wherein the satellite time service method comprises the following steps: receiving satellite signals, and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals; calculating the phase difference between the GPS1PPS signal and the frequency division 1PPS, adjusting the phase corresponding to the frequency division 1PPS according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase; selecting a time service mode or a time keeping mode according to the satellite geometric precision factor PDOP value; judging whether the state of the local 1PPS signal is normal or not, and selecting whether the local 1PPS signal is directly used as an output signal of a time service mode or not according to the state; the method can calculate to obtain accurate local 1PPS signals, well reduce signal output errors, select a time service mode or a time keeping mode through the satellite geometric accuracy factor PDOP value, determine whether to output the signals as the preferred signals according to the state of the local 1PPS signals, and improve the time service stability.
Description
Technical Field
The invention mainly relates to the field of time service technical processing, in particular to a satellite time service method, a satellite time service device and a storage medium.
Background
The high-precision time service is vital to the development of the whole society, and relates to a plurality of key infrastructures of national energy, economy and social safety, such as a communication system, an electric power system, a financial system and a railway system, and the effective operation of the high-precision time service depends on high-precision time synchronization;
there are many time service methods, and the time service methods can be divided into long and short wave time service, telephone time service, internet time service, satellite time service and the like according to the existing time service means. The satellite time service widely used at present is a time service means for transmitting or relaying standard time signals through a navigation satellite; the satellite time service can be divided into two-way time service and one-way time service, and the one-way time service method is mainly characterized in that a receiver receives navigation messages and related information, and a user autonomously calculates clock error to correct local time so as to synchronize the local time with the satellite system time.
For example, in a method for outputting a frequency signal by utilizing the complementary characteristics of a satellite clock and a crystal oscillator, a common crystal oscillator hardly meets the requirement of the high-precision synchronous control field, and even a high-precision crystal oscillator, the accumulated error is continuously increased along with the lapse of the service time, and the crystal oscillator itself is aged to cause a certain frequency drift.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a satellite time service method, a satellite time service device and a storage medium.
The technical scheme for solving the technical problems is as follows: a satellite time service method comprises the following steps:
receiving satellite signals, and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals;
outputting a frequency signal through a rubidium atomic clock, performing frequency division processing on the frequency signal to obtain a frequency division 1PPS signal, calculating a phase difference between the GPS1PPS signal and the frequency division 1PPS signal, adjusting a phase corresponding to the frequency division 1PPS signal according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase;
determining a satellite geometric accuracy factor PDOP value according to the navigation positioning data information, and selecting a time service mode or a time keeping mode according to the satellite geometric accuracy factor PDOP value;
when the time-keeping mode is selected, the local 1PPS signal is used as an output signal of the time-keeping mode,
and when the time service mode is selected, judging whether the state of the local 1PPS signal is normal, if so, taking the local 1PPS signal as an output signal of the time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
Another technical solution of the present invention for solving the above technical problems is as follows: a satellite time service device comprising:
the satellite signal processing module is used for receiving satellite signals and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals;
the processing module is used for outputting a frequency signal through a rubidium atomic clock, carrying out frequency division processing on the frequency signal to obtain a frequency division 1PPS signal, calculating the phase difference between the GPS1PPS signal and the frequency division 1PPS signal, adjusting the phase corresponding to the frequency division 1PPS signal according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase;
the mode selection module is used for determining a satellite geometric precision factor PDOP value according to the navigation positioning data information and selecting a time service mode or a time keeping mode according to the satellite geometric precision factor PDOP value;
the processing module is further used for taking the local 1PPS signal as an output signal of the time-keeping mode when the time-keeping mode is selected,
and when the time service mode is selected, judging whether the state of the local 1PPS signal is normal, if so, taking the local 1PPS signal as an output signal of the time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
The invention has the beneficial effects that: the method comprises the steps of correcting by calculating the phase difference of a GPS1PPS signal and a frequency division 1PPS signal of a satellite to obtain an accurate local 1PPS signal, reducing signal output errors by a mutual reference correction method, selecting a time service mode or a time keeping mode by a satellite geometric accuracy factor PDOP value, and determining whether the signal is preferably output according to the state of the local 1PPS signal, so that the time service stability is improved.
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Fig. 1 is a flowchart of a method of a satellite time service method according to an embodiment of the present invention;
fig. 2 is a block diagram of a satellite time service device according to an embodiment of the present invention;
FIG. 3 is a block diagram of a satellite time service device according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of calculating a phase difference according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a flowchart of a method of a satellite time service method according to an embodiment of the present invention;
as shown in fig. 1, a satellite time service method includes the following steps:
receiving satellite signals, and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals;
outputting a frequency signal through a rubidium atomic clock, performing frequency division processing on the frequency signal to obtain a frequency division 1PPS signal, calculating a phase difference between the GPS1PPS signal and the frequency division 1PPS signal, adjusting a phase corresponding to the frequency division 1PPS signal according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase;
determining a satellite geometric accuracy factor PDOP value according to the navigation positioning data information, and selecting a time service mode or a time keeping mode according to the satellite geometric accuracy factor PDOP value;
when the time-keeping mode is selected, the local 1PPS signal is used as an output signal of the time-keeping mode,
and when the time service mode is selected, judging whether the state of the local 1PPS signal is normal, if so, taking the local 1PPS signal as an output signal of the time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
Specifically, the selecting a time service mode or a time keeping mode according to the PDOP value includes:
and if the value of the satellite geometric accuracy factor PDOP is larger than 3, selecting a time keeping mode, otherwise, selecting a time service mode.
In the above embodiment, the phase difference between the GPS1PPS signal and the frequency-divided 1PPS signal of the satellite is calculated and corrected to obtain the accurate local 1PPS signal, the signal output error is preferably reduced by a mutual-reference correction method, the time service mode or the time keeping mode is selected by the satellite geometric accuracy factor PDOP value, and whether the signal is output as a preferred signal is determined according to the state of the local 1PPS signal, thereby improving the time service stability.
Optionally, as an embodiment of the present invention, when the time service mode or the time keeping mode is selected, the method further includes the steps of:
obtaining original observation data through the satellite signal, and resolving the original observation data to obtain a clock error correction value;
and correcting the local clock according to the clock difference correction value, and synchronizing the corrected local clock to the UTC clock in the selected time service mode or the timekeeping mode.
Optionally, as an embodiment of the present invention, the calculating the original observation data to obtain the clock correction value specifically includes:
resolving the original observation data according to a weighted least square algorithm to obtain a receiver position and a receiver clock error;
and calculating the receiver position and the receiver clock error according to a high-order difference algorithm between epochs to obtain a clock error correction value.
In the above embodiment, the clock difference correction value is obtained by resolving the original observation data, and the local clock is corrected by the clock difference correction value.
Optionally, as an embodiment of the present invention, the outputting a frequency signal through a rubidium atomic clock, and dividing the frequency signal to obtain a frequency division 1PPS signal includes:
the rubidium atomic clock output signal is a 10M frequency signal, and frequency multiplication processing is carried out on the 10M frequency signal to obtain a frequency multiplication signal;
and carrying out frequency division processing on the frequency multiplication signal to obtain a frequency division 1PPS signal.
Specifically, the rubidium atomic clock is a chip-level rubidium atomic clock.
In the above embodiment, the frequency signal of which the rubidium atomic clock output signal is 10M can be multiplied, which is beneficial to frequency division processing to obtain a frequency division 1PPS signal, and improves the signal accuracy.
Optionally, as an embodiment of the present invention, the calculating a phase difference between the GPS1PPS signal and the frequency-divided 1PPS signal includes a phase rough measurement step and a phase fine measurement step:
the phase rough measurement step comprises the following steps: obtaining phases of the GPS1PPS signal and the frequency division 1PPS signal according to a pulse counting method, and calculating a difference between a rising edge phase of the GPS1PPS signal and a rising edge phase of the frequency division 1PPS signal to obtain a first phase difference;
the phase fine measurement step comprises the following steps: measuring the phases of the GPS1PPS signal and the frequency division 1PPS signal corresponding to the signal period less than the second signal period through a TDC-GP22 time measuring chip, and calculating the difference between the phase of the rising edge of the GPS1PPS signal and the phase of the rising edge of the frequency division 1PPS signal corresponding to the signal period less than the second signal period to obtain a second phase difference;
and summing the first phase difference and the second phase difference to obtain the phase difference of the GPS1PPS signal and the frequency division 1PPS signal.
Because the signal period of the frequency division 1PPS signal obtained after the frequency division processing is 5ns, the measurement precision of the phase rough measurement is plus or minus 5ns, and the phase difference with the period less than 5ns can not be measured, the phase fine measurement part adopts a high-precision TDC-GP22 time measurement chip to measure the phase difference less than the second signal period, namely 5ns, and the measurement precision is 50ps, so that the phase difference less than 5ns can be accurately measured.
Optionally, as an embodiment of the present invention, the determining whether the state of the local 1PPS signal is normal includes:
and judging whether the phase difference between the local 1PPS signal and the GPS1PPS signal is smaller than a preset deviation value or not, and whether the duration time of the state that the phase difference is smaller than the preset deviation value is larger than preset time or not, if so, taking the local 1PPS signal as an output signal of a time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
For example, the preset deviation value is 5ns and the duration is 10s.
In the above embodiment, the state of the local 1PPS signal is determined, and if the local 1PPS signal meets the criterion, the local 1PPS signal is preferably used as the time service mode output signal, otherwise, the GPS1PPS signal is used as the output signal.
Fig. 2 is a block diagram of a satellite time service device according to an embodiment of the present invention;
optionally, as an embodiment of the present invention, as shown in fig. 2, a satellite time service device includes:
the satellite signal processing module is used for receiving satellite signals and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals;
the processing module is used for outputting a frequency signal through a rubidium atomic clock, carrying out frequency division processing on the frequency signal to obtain a frequency division 1PPS signal, calculating the phase difference between the GPS1PPS signal and the frequency division 1PPS signal, adjusting the phase corresponding to the frequency division 1PPS signal according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase;
the mode selection module is used for determining a satellite geometric precision factor PDOP value according to the navigation positioning data information and selecting a time service mode or a time keeping mode according to the satellite geometric precision factor PDOP value;
the processing module is further used for taking the local 1PPS signal as an output signal of the time keeping mode when the time keeping mode is selected,
and when the time service mode is selected, judging whether the state of the local 1PPS signal is normal, if so, taking the local 1PPS signal as an output signal of the time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
Specifically, as shown in fig. 3, the satellite signal processing module includes a u-blox M8T processing sub-module and an ARM processing sub-module, the u-blox M8T processing sub-module is configured to receive a satellite signal and positioning information, and the ARM processing sub-module is configured to process a GPS1PPS signal and navigation positioning data information obtained by the satellite signal.
Optionally, as an embodiment of the present invention, the processing module is configured to:
the output signal of the rubidium atomic clock is a 10M frequency signal;
carrying out frequency doubling processing on the 10M frequency signal to obtain a frequency doubling signal;
and carrying out frequency division processing on the frequency multiplication signal to obtain a frequency division 1PPS signal.
Specifically, the rubidium atomic clock is a chip-level rubidium atomic clock;
specifically, as shown in fig. 3, the processing module includes an FPGA processing sub-module and a phase discrimination sub-module:
the phase discrimination submodule is used for calculating the phase difference between the GPS1PPS signal and the frequency division 1PPS signal;
the FPGA processing submodule comprises a frequency division unit and a phase shift unit:
the frequency division unit is used for carrying out frequency division processing on the frequency multiplication signal to obtain a frequency division 1PPS signal;
and the phase shifting unit is used for adjusting the phase corresponding to the frequency division 1PPS signal according to the phase difference and obtaining a local 1PPS signal according to the adjusted phase.
In the above embodiment, the frequency doubling is performed by an external frequency multiplier, and the external frequency multiplier transmits the processed frequency doubling signal to the frequency dividing unit of the FPGA processing chip.
Optionally, as an embodiment of the present invention, as shown in fig. 4, a phase detection submodule of the processing module is specifically configured to perform coarse phase detection and fine phase detection:
the phase rough measurement is to obtain the phases of the GPS1PPS signal and the frequency division 1PPS signal according to a pulse counting method, calculate the difference between the phase of the rising edge of the GPS1PPS signal and the phase of the rising edge of the frequency division 1PPS signal, and obtain a first phase difference;
the phase fine measurement step is to measure the difference between the phase of the rising edge of the GPS1PPS signal corresponding to the signal period less than one second and the phase of the rising edge of the frequency division 1PPS signal through a TDC-GP22 time measurement chip to obtain a second phase difference;
and summing the first phase difference and the second phase difference to obtain the phase difference of the GPS1PPS signal and the frequency division 1PPS signal.
Because the signal period of the frequency division 1PPS signal obtained after the frequency division processing is 5ns, the measurement precision of the phase rough measurement is plus or minus 5ns, and the phase difference with the period less than 5ns can not be measured, the phase fine measurement part adopts a high-precision TDC-GP22 time measurement chip to measure the phase difference less than the second signal period, namely 5ns, and the measurement precision is 50ps, so that the phase difference less than 5ns can be accurately measured.
Optionally, as an embodiment of the present invention, the AMR processing unit of the satellite signal processing module is configured to obtain original observation data through the satellite signal, and solve the original observation data to obtain a clock correction value;
the FPGA processing submodule also comprises a clock correction unit which is used for correcting a local clock according to the clock difference correction value and synchronizing the corrected local clock to the UTC clock in the selected time service mode or the timekeeping mode.
Optionally, as an embodiment of the present invention, the ARM processing sub-module of the satellite signal processing module is further configured to:
obtaining original observation data through the satellite signal, and resolving the original observation data to obtain a clock error correction value;
and correcting the local clock according to the clock difference correction value, and synchronizing the corrected local clock to the UTC clock in the selected time service mode or the timekeeping mode.
Optionally, as an embodiment of the present invention, the ARM processing sub-module of the satellite signal processing module is specifically configured to:
resolving the original observation data according to a weighted least square algorithm to obtain a receiver position and a receiver clock error;
and calculating the receiver position and the receiver clock error according to a high-order difference algorithm between epochs to obtain a clock error correction value.
Optionally, as an embodiment of the present invention, the processing module further includes a signal state judgment sub-module:
and judging whether the phase difference between the local 1PPS signal and the GPS1PPS signal is smaller than a preset deviation value or not and judging whether the time for keeping the state that the phase difference is smaller than the preset deviation value is larger than the preset time or not, if so, taking the local 1PPS signal as an output signal of a time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
Optionally, as another embodiment of the present invention, a satellite time service device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method when executing the computer program.
Optionally, as another embodiment of the present invention, a computer-readable storage medium stores a computer program, and when executed by a processor, the computer program implements the steps of the method.
The invention obtains accurate local 1PPS signals by calculating the phase difference of GPS1PPS signals and frequency division signals of satellites, reduces signal output errors better by a mutual reference correction method, selects a time service mode or a time keeping mode by a satellite geometric precision factor PDOP value, determines whether to be preferred signal output according to the state of the local 1PPS signals, and improves the time service stability.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partly contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A satellite time service method is characterized by comprising the following steps:
receiving satellite signals, and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals;
outputting a frequency signal through a rubidium atomic clock, performing frequency division processing on the frequency signal to obtain a frequency division 1PPS signal, calculating a phase difference between the GPS1PPS signal and the frequency division 1PPS signal, adjusting a phase corresponding to the frequency division 1PPS signal according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase;
determining a satellite geometric accuracy factor PDOP value according to the navigation positioning data information, and selecting a time service mode or a time keeping mode according to the satellite geometric accuracy factor PDOP value;
when the time-keeping mode is selected, the local 1PPS signal is used as an output signal of the time-keeping mode,
when the time service mode is selected, judging whether the state of the local 1PPS signal is normal, if so, taking the local 1PPS signal as an output signal of the time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode;
the phase difference of the GPS1PPS signal and the frequency division 1PPS signal is calculated, and the phase difference calculation method comprises the following steps of:
the phase rough measurement step comprises the following steps: respectively obtaining the phases of the GPS1PPS signal and the frequency division 1PPS signal according to a pulse counting method, and calculating the difference between the phase of the rising edge of the GPS1PPS signal and the phase of the rising edge of the frequency division 1PPS signal to obtain a first phase difference;
the phase fine measurement step comprises the following steps: measuring the phases of the GPS1PPS signal and the frequency division 1PPS signal corresponding to the signal period less than the second signal period through a TDC-GP22 time measuring chip, and calculating the difference between the phase of the rising edge of the GPS1PPS signal and the phase of the rising edge of the frequency division 1PPS signal corresponding to the signal period less than the second signal period to obtain a second phase difference;
and summing the first phase difference and the second phase difference to obtain the phase difference of the GPS1PPS signal and the frequency division 1PPS signal.
2. The satellite time service method according to claim 1, when the time service mode or the time keeping mode is selected, further comprising the steps of:
obtaining original observation data through the satellite signal, and resolving the original observation data to obtain a clock error correction value;
and correcting the local clock according to the clock difference correction value, and synchronizing the corrected local clock to the UTC clock in the selected time service mode or the timekeeping mode.
3. The satellite time service method according to claim 2, wherein the calculating the original observation data to obtain the clock correction value specifically includes:
resolving the original observation data according to a weighted least square algorithm to obtain a receiver position and a receiver clock error;
and calculating the receiver position and the receiver clock error according to a high-order difference algorithm between epochs to obtain a clock error correction value.
4. The satellite time service method according to claim 1, wherein the frequency division 1PPS signal is obtained by dividing the frequency signal output by the rubidium atomic clock, and the method comprises:
the rubidium atomic clock output signal is a 10M frequency signal, and frequency multiplication processing is carried out on the 10M frequency signal to obtain a frequency multiplication signal;
and carrying out frequency division processing on the frequency multiplication signal to obtain a frequency division 1PPS signal.
5. The satellite time service method according to any one of claims 1 to 4, wherein judging whether the state of the local 1PPS signal is normal comprises:
and judging whether the phase difference between the local 1PPS signal and the GPS1PPS signal is smaller than a preset deviation value or not, and whether the duration time of the state that the phase difference is smaller than the preset deviation value is larger than preset time or not, if so, taking the local 1PPS signal as an output signal of a time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode.
6. A satellite time service device, comprising:
the satellite signal processing module is used for receiving satellite signals and obtaining GPS1PPS signals and navigation positioning data information through the satellite signals;
the processing module is used for outputting a frequency signal through a rubidium atomic clock, carrying out frequency division processing on the frequency signal to obtain a frequency division 1PPS signal, calculating the phase difference between the GPS1PPS signal and the frequency division 1PPS signal, adjusting the phase corresponding to the frequency division 1PPS signal according to the phase difference, and obtaining a local 1PPS signal according to the frequency division 1PPS signal with the adjusted phase;
the mode selection module is used for determining a satellite geometric precision factor PDOP value according to the navigation positioning data information and selecting a time service mode or a time keeping mode according to the satellite geometric precision factor PDOP value;
the processing module is further used for taking the local 1PPS signal as an output signal of the time keeping mode when the time keeping mode is selected,
when the time service mode is selected, judging whether the state of the local 1PPS signal is normal, if so, taking the local 1PPS signal as an output signal of the time service mode, otherwise, taking the GPS1PPS signal as an output signal of the time service mode;
in the processing module, the phase difference between the GPS1PPS signal and the frequency division 1PPS signal is calculated, and the phase measuring method comprises the following steps of:
the phase rough measurement step comprises the following steps: respectively obtaining the phases of the GPS1PPS signal and the frequency division 1PPS signal according to a pulse counting method, and calculating the difference between the phase of the rising edge of the GPS1PPS signal and the phase of the rising edge of the frequency division 1PPS signal to obtain a first phase difference;
the phase fine measurement step comprises the following steps: measuring the phases of the GPS1PPS signal and the frequency division 1PPS signal corresponding to the signal period less than the second signal period through a TDC-GP22 time measuring chip, and calculating the difference between the phase of the rising edge of the GPS1PPS signal and the phase of the rising edge of the frequency division 1PPS signal corresponding to the signal period less than the second signal period to obtain a second phase difference;
and summing the first phase difference and the second phase difference to obtain the phase difference of the GPS1PPS signal and the frequency division 1PPS signal.
7. The satellite time service device according to claim 6, wherein the satellite signal processing module is further configured to obtain original observation data through the satellite signal, and solve the original observation data to obtain a clock correction value;
and the processing module is also used for correcting the local clock according to the clock difference correction value and synchronizing the corrected local clock to the UTC clock in the selected time service mode or the timekeeping mode.
8. A satellite timing apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 5 when executing the computer program.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of a method according to any one of claims 1 to 5.
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| CN109634092B (en) * | 2019-01-16 | 2021-04-09 | 和芯星通科技(北京)有限公司 | GNSS receiver-based time service method and GNSS receiver |
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| JP2017138197A (en) * | 2016-02-03 | 2017-08-10 | セイコーエプソン株式会社 | Timing signal generating device, electronic equipment, and mobile body |
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