CN103346852B - A kind of device that reference clock signal is provided - Google Patents
A kind of device that reference clock signal is provided Download PDFInfo
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- CN103346852B CN103346852B CN201310207460.7A CN201310207460A CN103346852B CN 103346852 B CN103346852 B CN 103346852B CN 201310207460 A CN201310207460 A CN 201310207460A CN 103346852 B CN103346852 B CN 103346852B
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Abstract
The invention discloses a kind of device that reference clock signal is provided, belong to digital dock field.Device comprises: comprise the atomic clock output module for providing atomic clock reference clock signal, described device also comprises: for providing the local clock output module of local reference clock signal; And for from least two clock output modules, select signal that a clock output module provides as reference clock signal, and exporting the reference clock output module of described reference clock signal, described at least two clock output modules comprise described atomic clock output module and described local clock output module; Described atomic clock reference clock signal and described local reference clock signal are setpoint frequency; Described reference clock output module is connected with described atomic clock output module and described local clock output module respectively.The present invention can make reference clock signal continue to export.
Description
Technical field
The present invention relates to digital dock field, particularly a kind of device that reference clock signal is provided.
Background technology
Along with SDH (SynchronousDigitalHierarchy, digital synchronous system) propelling, the reference clock signal (UTC (CoordinatedUniversalTime, universal time) of such as national time service central service) that time centre can be provided by time network is published to each reference clock signal point of application (in such as temporal frequency laboratory and the time frequency system each point of application).Each reference clock signal point of application adopts reference clock signal as with reference to fiducial time.In addition, except the reference clock signal that time network provides, each reference clock signal point of application can also adopt local reference clock signal, such as high-frequency crystal oscillator signal, as reference clock signal.
Each reference clock signal point of application obtains the reference clock signal needed by the acquisition device of reference clock signal.The acquisition device of existing reference clock signal comprises the acquisition device of external timing signal, such as GPS (GlobalPositioningSystem, global positioning system) satellite-signal acquisition device: for obtaining gps satellite signal and providing it to reference clock signal point of application.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem: the acquisition device of existing reference clock signal can only provide single reference clock signal, the acquisition device of such as gps satellite signal only provides gps satellite signal, if there is disturbance fluctuation in gps satellite signal, this acquisition device can not provide lasting reference clock signal, may affect the running of reference clock signal point of application.And single reference clock signal, reference clock signal point of application adopts different reference clock signal demand at different application occasion needs can not be met.
Summary of the invention
In order to provide lasting reference clock signal, and meeting reference clock signal point of application adopts different reference clock signal demand in different application occasion, embodiments providing a kind of device that reference clock signal is provided.Described technical scheme is as follows:
There is provided a device for reference clock signal, described device comprises: for providing the atomic clock output module of atomic clock reference clock signal, described device also comprises:
For providing the local clock output module of local reference clock signal; And
For from least two clock output modules, select signal that a clock output module provides as reference clock signal, and exporting the reference clock output module of described reference clock signal, described at least two clock output modules comprise described atomic clock output module and described local clock output module;
Described atomic clock reference clock signal and described local reference clock signal are setpoint frequency; Described reference clock output module is connected with described atomic clock output module and described local clock output module respectively;
Described atomic clock output module comprises:
For providing the atomic clock of atomic clock signal;
For the atomic clock signal frequency division provided by described atomic clock, obtain the first pulse per second (PPS) generation unit of atomic clock pps pulse per second signal;
For the global positioning system receiving element of receiving world locational system pps pulse per second signal;
The global positioning system pps pulse per second signal received for the atomic clock pps pulse per second signal that obtains described first pulse per second (PPS) generation unit and described global positioning system receiving element carries out phase difference measurements, and obtain measurement result first compares facies unit; And
For the measurement result obtained than facies unit according to described first, horizontal phasing control is entered to the atomic clock signal that described atomic clock provides, and export the first processing unit of the atomic clock signal after adjustment;
Atomic clock signal after the adjustment that described first processing unit exports is described setpoint frequency, described atomic clock is connected with described first pulse per second (PPS) generation unit and described first processing unit respectively, and described first is connected with described first pulse per second (PPS) generation unit, described global positioning system receiving element and described first processing unit respectively than facies unit;
Described local clock output module comprises:
For providing the local clock generation unit of local clock pulses; Described local clock generation unit is VCXO;
For the local clock pulses frequency division provided by described local clock generation unit, obtain the 3rd pulse per second (PPS) generation unit of local pps pulse per second signal;
The atomic clock pps pulse per second signal obtained for the described local pps pulse per second signal that obtains described 3rd pulse per second (PPS) generation unit and described first pulse per second (PPS) generation unit carries out phase difference measurements, and the obtain measurement result the 3rd compares facies unit; And
For according to described 3rd measurement result obtained than facies unit, horizontal phasing control is entered to the local clock pulses that described local clock generation unit provides, and export the 3rd processing unit of the local clock pulses after adjustment;
Local clock pulses after the adjustment that described 3rd processing unit exports is described setpoint frequency, described local clock generation unit is connected with described 3rd pulse per second (PPS) generation unit and described 3rd processing unit respectively, and the described 3rd is connected with described first pulse per second (PPS) generation unit, described 3rd pulse per second (PPS) generation unit and described 3rd processing unit respectively than facies unit;
Described device also comprises:
For providing the external clock output module of external reference clock signal, described external reference clock signal is described setpoint frequency;
Described reference clock output module comprises:
Processor and under the control of described processor, the selector of output reference clock signal, described selector comprises control end, three inputs and one for exporting the output of described reference clock signal, and described three inputs are connected with described atomic clock output module, described local clock output module and described external clock output module respectively;
Described reference clock signal is the signal of an input input in described three inputs.
Alternatively, described atomic clock output module also comprises:
External reference clock signal for providing described external clock output module carries out frequency division, obtains the second pulse per second (PPS) generation unit of external clock pps pulse per second signal;
The external clock pps pulse per second signal obtained for the atomic clock pps pulse per second signal that obtains described first pulse per second (PPS) generation unit and described second pulse per second (PPS) generation unit carries out phase difference measurements, and obtain measurement result second compares facies unit; And
For the measurement result obtained than facies unit according to described second, horizontal phasing control is entered to the atomic clock signal that described atomic clock provides, and export the second processing unit of the atomic clock signal after adjustment;
Atom signals after the adjustment that described second processing unit exports is described setpoint frequency, described second pulse per second (PPS) generation unit is connected with described external clock output module, described second is connected with described first pulse per second (PPS) generation unit, described second pulse per second (PPS) generation unit and described second processing unit respectively than facies unit, and described atomic clock is connected with described second processing unit.
Preferably, described external clock output module comprises:
For receiving external timing signal, and the local clock pulses provided with described local clock generation unit is for reference clock signal, measures the counter of the frequency of described external timing signal;
For frequency and the described setpoint frequency of the described external timing signal of more described counter measures, obtain comparative result, and produce the fourth processing unit of control signal according to described comparative result; And
For the described control signal produced according to described fourth processing unit, the frequency of described external timing signal is adjusted to described setpoint frequency, and exports the signal generating unit being adjusted to the external timing signal of described setpoint frequency;
Described four processing units are connected with described counter and described signal generating unit respectively.
Preferably, described atomic clock is rubidium atomic clock.
Preferably, described setpoint frequency is 10MHz.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is: the atomic clock reference clock signal of the setpoint frequency that the local reference clock signal of the setpoint frequency exported by local clock output module by reference clock output module or atomic clock output module are provided is as reference clock signal, and export the reference clock signal of setpoint frequency, on the one hand, can select to export local reference clock signal or atomic clock reference clock signal any one, meet the different demands of reference clock signal point of application; On the other hand, one of both local reference clock signal or atomic clock reference clock signal can be worked as when going wrong, select to export another one, make reference clock signal continue to export, thus reference clock signal point of application is run well.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation providing the device of reference clock signal that the embodiment of the present invention provides;
Fig. 2 be the embodiment of the present invention provide another the structural representation of the device of reference clock signal is provided;
Fig. 3 be the embodiment of the present invention provide another the structural representation of the device of reference clock signal is provided;
Fig. 4 is the structural representation that another kind that the embodiment of the present invention provides provides the device of reference clock signal.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
In embodiments of the present invention, local clock provides local clock pulses, and local clock includes but not limited to atomic clock and crystal oscillator.External clock provides external timing signal, and external clock includes but not limited to the local clock backed up, and is commonly referred to local reference source.
Embodiment one
Embodiments provide a kind of device providing reference clock signal, see Fig. 1 and Fig. 2, this device comprises: for providing the atomic clock output module 101 of atomic clock reference clock signal.This device also comprises:
For providing the local clock output module 102 of local reference clock signal; And, for from least two clock output modules, select signal that a clock output module provides as reference clock signal, and export the reference clock output module 103 of this reference clock signal.Aforementioned at least two clock output modules comprise atomic clock output module 101 and local clock output module 102.
Wherein, atomic clock reference clock signal and local reference clock signal are setpoint frequency.Reference clock output module 103 is connected with atomic clock output module 101 and local clock output module 102 respectively.
See Fig. 2, atomic clock output module 101 comprises:
For providing the atomic clock 1011 of atomic clock signal; For the atomic clock signal frequency division provided by atomic clock 1011, obtain the first pulse per second (PPS) generation unit 1012 of atomic clock 1pps (1pulse-per-second, pulse per second (PPS)) signal; For receiving the GPS receiving element 1013 of GPS1pps signal; The GPS1pps signal received for the atomic clock 1pps signal that obtains the first pulse per second (PPS) generation unit 1012 and GPS receiving element 1013 carries out phase difference measurements, obtains first of measurement result than facies unit 1014; And, for the measurement result obtained than facies unit 1014 according to first, horizontal phasing control is entered to the atomic clock signal that atomic clock 1011 provides, and export the first processing unit 1015 of the atomic clock signal after adjustment.
Wherein, first processing unit 1015 export adjustment after atomic clock signal be setpoint frequency.Atomic clock 1011 is connected with the first pulse per second (PPS) generation unit 1012 and the first processing unit 1015 respectively, and first is connected with the first pulse per second (PPS) generation unit 1012, GPS receiving element 1013 and the first processing unit 1015 respectively than facies unit 1014.
Preferably, atomic clock 1012 can be rubidium atomic clock.
Particularly, the atomic clock reference clock signal that atomic clock output module 101 provides is synchronous with the reception GPS1pps signal that GPS receiving element 1013 receives, and can improve the accuracy of atomic clock reference clock signal.
Refer again to Fig. 2, local clock output module 102 comprises:
For providing the local clock generation unit 1021 of local clock pulses; For the local clock pulses frequency division provided by local clock generation unit 1021, obtain the 3rd pulse per second (PPS) generation unit 1022 of local 1pps signal; The atomic clock 1pps signal obtained for the local 1pps signal that obtains the 3rd pulse per second (PPS) generation unit 1022 and the first pulse per second (PPS) generation unit 1012 carries out phase difference measurements, obtains the 3rd of measurement result the than facies unit 1023; And, for the measurement result obtained than facies unit 1023 according to the 3rd, horizontal phasing control is entered to the local clock pulses that local clock generation unit 1021 provides, and export the 3rd processing unit 1024 of the local clock pulses after adjustment.
Wherein, the 3rd processing unit 1024 export adjustment after local clock pulses be setpoint frequency.Local clock generation unit 1021 is connected with the 3rd pulse per second (PPS) generation unit 1022 and the 3rd processing unit 1024 respectively, and the 3rd is connected with the first pulse per second (PPS) generation unit 1012, the 3rd pulse per second (PPS) generation unit 1022 and the 3rd processing unit 1024 respectively than facies unit 1023.
Preferably, local clock generation unit 1021 can be VCXO, and such as model is the thermostatic control formula crystal oscillator of OSA8607.
Particularly, the local reference clock signal that the first local clock output module 102 exports is synchronized with the atomic clock signal that atomic clock 1011 produces, and can improve accuracy.
Preferably, the first processing unit 1015 and the 3rd processing unit 1024 can be microprocessor or microcontroller.Particularly, the first processing unit 1015 and the 3rd processing unit 1024 can be same microprocessor or microcontroller.
Preferably, setpoint frequency can be 10MHz.
The beneficial effect that the said apparatus that the embodiment of the present invention provides brings is: the atomic clock reference clock signal of the setpoint frequency that the local reference clock signal of the setpoint frequency exported by local clock output module by reference clock output module or atomic clock output module are provided is as reference clock signal, and export the reference clock signal of setpoint frequency, on the one hand, can select to export local reference clock signal or atomic clock reference clock signal any one, meet the different demands of reference clock signal point of application; On the other hand, one of both local reference clock signal or atomic clock reference clock signal can be worked as when going wrong, select to export another one, make reference clock signal continue to export, thus reference clock signal point of application is run well.
Further, atomic clock output module export atomic clock reference clock signal be synchronous with GPS1pps signal after clock signal, improve the accuracy of atomic clock reference clock signal; Local clock output module export local reference clock signal be synchronous with atomic clock signal after clock signal, provide the accuracy of local reference clock signal.
Embodiment two
Embodiments provide a kind of device providing reference clock signal, this device comprises atomic clock output module 201, local clock output module 202 and reference clock output module 203.Wherein, local clock output module 202 comprises local clock generation unit 2021, the 3rd pulse per second (PPS) generation unit 2022, the 3rd than facies unit 2023 and the 3rd processing unit 2024.The structure of local clock output module 202 is identical with the structure of the local clock output module 102 that (shown in Fig. 1 with Fig. 2) in embodiment one describes, omit at this and describe, difference is, (1) this device also comprises external clock output module 204, (2) describe the structure of reference clock output module 203 and the structure difference of (3) atomic clock output module 201.
See Fig. 3 and Fig. 4, this device also comprises: for providing the external clock output module 204 of external reference clock signal.This external reference clock signal is setpoint frequency.
Refer again to Fig. 3 and Fig. 4, reference clock output module 203 comprises:
Processor 2031 and under the control of processor 2031, the selector 2032 of output reference clock signal.This selector 2032 comprises control end C, three input I and output O for output reference clock signal.Three input I are connected with atomic clock output module 201, local clock output module 202 and external clock output module 204 respectively.Wherein, reference clock signal is the signal that an input I in three input I inputs.
Preferably, see Fig. 3 and Fig. 4, external clock output module 204 comprises:
For receiving external timing signal (in Fig. 3 and Fig. 4 arrow shown in), and the local clock pulses provided with local clock generation unit 2021 is for reference clock signal, measures the counter 2041 of the frequency of external timing signal; For comparing frequency and the setpoint frequency of the external timing signal that counter 2041 is measured, obtain comparative result, and produce the fourth processing unit 2042 of control signal according to this comparative result; And, for the control signal produced according to fourth processing unit 2042, the frequency of external timing signal is adjusted to setpoint frequency, and exports the signal generating unit 2043 being adjusted to the external timing signal of setpoint frequency.Wherein, fourth processing unit 2042 is connected with counter 2041 and signal generating unit 2043 respectively.
Particularly, the external timing signal of enter counter 2042 includes but not limited to local reference source.
Preferably, signal generating unit 2043 can be DDS (DirectDigitalSynthesizer, Direct Digital Synthesizer).
What deserves to be explained is, the external reference clock signal that external clock output module provides has following beneficial effect: the abnormalities such as fluctuation appear in (1) during when GPS1pps signal, the external timing signal that the atomic clock reference clock signal that atomic clock output module exports can also provide with external clock output module carries out synchronous, ensure that the signal stabilization that atomic clock output module exports; (2) in some special application scenarios, such as need Liang Ge unit (such as A and the B) time synchronized in the reference clock signal point of application inner short time, so the external signal at place of A unit (being equivalent to the external timing signal that external clock output module provides) must be introduced the time system (being equivalent to the local clock pulses that local clock output module provides) at place of B unit; (3) need to carry out accuracy detection to local measurement instrument, the input so will making measuring instrument by external signal with reference to carrying out homology self-inspection.
See Fig. 4, atomic clock output module 201 comprises atomic clock 2011, first pulse per second (PPS) generation unit 2012, GPS receiving element 2013, first than facies unit 2014 and the first processing unit 2015.Atomic clock 1011, the first pulse per second (PPS) generation unit 1012 that atomic clock 2011, first pulse per second (PPS) generation unit 2012, GPS receiving element 2013, first describe with (shown in Fig. 1 with Fig. 2) in embodiment one than the structure of facies unit 2014 and the first processing unit 2015, GPS receiving element 1013, first are more identical than the structure of facies unit 1014 and the first processing unit 1015, omit describe at this.This atomic clock output module 201 also comprises:
External reference clock signal for providing external clock output module 204 carries out frequency division, obtains the second pulse per second (PPS) generation unit 2016 of external clock 1pps signal; The external clock 1pps signal obtained for the atomic clock 1pps signal that obtains the first pulse per second (PPS) generation unit 2012 and the second pulse per second (PPS) generation unit 2016 carries out phase difference measurements, obtains second of measurement result than facies unit 2017; And, for the measurement result obtained than facies unit 2017 according to second, horizontal phasing control is entered to the atomic clock signal that atomic clock 2011 provides, and export the second processing unit 2018 of the atomic clock signal after adjustment.
Wherein, second processing unit 2018 export adjustment after atom signals be setpoint frequency.Second pulse per second (PPS) generation unit 2016 is connected with external clock output module 204, second is connected with the first pulse per second (PPS) generation unit 2012, second pulse per second (PPS) generation unit 2016 and the second processing unit 2018 respectively than facies unit 2017, and atomic clock 2011 is connected with the second processing unit 2018.
Preferably, the first processing unit 2015, second processing unit 2018, the 3rd processing unit 2024 or fourth processing unit 2042 can be microprocessor or microcontroller.Particularly, the first processing unit 2015, second processing unit 2018, the 3rd processing unit 2024 and fourth processing unit 2042 can be same processor with processor 2031.
Preferably, setpoint frequency can be 10MHz.
The beneficial effect that the said apparatus that the embodiment of the present invention provides brings is: the atomic clock reference clock signal of the setpoint frequency that the local reference clock signal of the setpoint frequency exported by local clock output module by reference clock output module or atomic clock output module are provided is as reference clock signal, and export the reference clock signal of setpoint frequency, on the one hand, can select to export local reference clock signal or atomic clock reference clock signal any one, meet the different demands of reference clock signal point of application; On the other hand, one of both local reference clock signal or atomic clock reference clock signal can be worked as when going wrong, select to export another one, make reference clock signal continue to export, thus reference clock signal point of application is run well.
Further, atomic clock output module export atomic clock reference clock signal be synchronous with GPS1pps signal after clock signal, improve the accuracy of atomic clock reference clock signal; Local clock output module export local reference clock signal be synchronous with atomic clock signal after clock signal, provide the accuracy of local reference clock signal.
Further, the local reference clock signal of the setpoint frequency that local clock output module can also export by reference clock output module, the atomic clock reference clock signal of the setpoint frequency that atomic clock output module provides, or the external reference clock signal that external clock output module provides is as reference clock signal, and export the reference clock signal of setpoint frequency, three kinds of reference clock signal any one can be selected to export, the scope of the reference clock signal that reference clock signal point of application is selected is larger, simultaneously, ensure to a greater extent to continue output reference clock signal.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. provide a device for reference clock signal, comprise the atomic clock output module for providing atomic clock reference clock signal, it is characterized in that, described device also comprises:
For providing the local clock output module of local reference clock signal; And
For from least two clock output modules, select signal that a clock output module provides as reference clock signal, and exporting the reference clock output module of described reference clock signal, described at least two clock output modules comprise described atomic clock output module and described local clock output module;
Described atomic clock reference clock signal and described local reference clock signal are setpoint frequency; Described reference clock output module is connected with described atomic clock output module and described local clock output module respectively;
Described atomic clock output module comprises:
For providing the atomic clock of atomic clock signal;
For the atomic clock signal frequency division provided by described atomic clock, obtain the first pulse per second (PPS) generation unit of atomic clock pps pulse per second signal;
For the global positioning system receiving element of receiving world locational system pps pulse per second signal;
The global positioning system pps pulse per second signal received for the atomic clock pps pulse per second signal that obtains described first pulse per second (PPS) generation unit and described global positioning system receiving element carries out phase difference measurements, and obtain measurement result first compares facies unit; And
For the measurement result obtained than facies unit according to described first, horizontal phasing control is entered to the atomic clock signal that described atomic clock provides, and export the first processing unit of the atomic clock signal after adjustment;
Atomic clock signal after the adjustment that described first processing unit exports is described setpoint frequency, described atomic clock is connected with described first pulse per second (PPS) generation unit and described first processing unit respectively, and described first is connected with described first pulse per second (PPS) generation unit, described global positioning system receiving element and described first processing unit respectively than facies unit;
Described local clock output module comprises:
For providing the local clock generation unit of local clock pulses; Described local clock generation unit is VCXO;
For the local clock pulses frequency division provided by described local clock generation unit, obtain the 3rd pulse per second (PPS) generation unit of local pps pulse per second signal;
The atomic clock pps pulse per second signal obtained for the described local pps pulse per second signal that obtains described 3rd pulse per second (PPS) generation unit and described first pulse per second (PPS) generation unit carries out phase difference measurements, and the obtain measurement result the 3rd compares facies unit; And
For according to described 3rd measurement result obtained than facies unit, horizontal phasing control is entered to the local clock pulses that described local clock generation unit provides, and export the 3rd processing unit of the local clock pulses after adjustment;
Local clock pulses after the adjustment that described 3rd processing unit exports is described setpoint frequency, described local clock generation unit is connected with described 3rd pulse per second (PPS) generation unit and described 3rd processing unit respectively, and the described 3rd is connected with described first pulse per second (PPS) generation unit, described 3rd pulse per second (PPS) generation unit and described 3rd processing unit respectively than facies unit;
Described device also comprises:
For providing the external clock output module of external reference clock signal, described external reference clock signal is described setpoint frequency;
Described reference clock output module comprises:
Processor and under the control of described processor, the selector of output reference clock signal, described selector comprises control end, three inputs and one for exporting the output of described reference clock signal, and described three inputs are connected with described atomic clock output module, described local clock output module and described external clock output module respectively;
Described reference clock signal is the signal of an input input in described three inputs.
2. device according to claim 1, is characterized in that, described atomic clock output module also comprises:
External reference clock signal for providing described external clock output module carries out frequency division, obtains the second pulse per second (PPS) generation unit of external clock pps pulse per second signal;
The external clock pps pulse per second signal obtained for the atomic clock pps pulse per second signal that obtains described first pulse per second (PPS) generation unit and described second pulse per second (PPS) generation unit carries out phase difference measurements, and obtain measurement result second compares facies unit; And
For the measurement result obtained than facies unit according to described second, horizontal phasing control is entered to the atomic clock signal that described atomic clock provides, and export the second processing unit of the atomic clock signal after adjustment;
Atom signals after the adjustment that described second processing unit exports is described setpoint frequency, described second pulse per second (PPS) generation unit is connected with described external clock output module, described second is connected with described first pulse per second (PPS) generation unit, described second pulse per second (PPS) generation unit and described second processing unit respectively than facies unit, and described atomic clock is connected with described second processing unit.
3. device according to claim 1 and 2, is characterized in that, described external clock output module comprises:
For receiving external timing signal, and the local clock pulses provided with described local clock generation unit is for reference clock signal, measures the counter of the frequency of described external timing signal;
For frequency and the described setpoint frequency of the described external timing signal of more described counter measures, obtain comparative result, and produce the fourth processing unit of control signal according to described comparative result; And
For the described control signal produced according to described fourth processing unit, the frequency of described external timing signal is adjusted to described setpoint frequency, and exports the signal generating unit being adjusted to the external timing signal of described setpoint frequency;
Described four processing units are connected with described counter and described signal generating unit respectively.
4. device according to claim 1 and 2, is characterized in that, described atomic clock is rubidium atomic clock.
5. device according to claim 1 and 2, is characterized in that, described setpoint frequency is 10MHz.
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| CN105549375B (en) * | 2016-01-29 | 2017-12-26 | 中国科学院长春光学精密机械与物理研究所 | The spaceborne Time Transmission system of high accuracy |
| CN106503592B (en) * | 2016-11-09 | 2021-07-09 | 深圳市德明利技术股份有限公司 | Encryption method and system based on programmable logic device |
| CN106712888A (en) * | 2016-12-30 | 2017-05-24 | 江汉大学 | High-stability time base signal output system |
| CN108199799B (en) * | 2017-12-23 | 2019-09-03 | 航天恒星科技有限公司 | A kind of satellite communication terminal digital dock synchronous method and device |
| CN115561988B (en) * | 2022-12-06 | 2023-03-07 | 浙江赛思电子科技有限公司 | Time service terminal and time service system and method thereof |
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