CN102510320A - Clock source device based on GPS (global positioning system) and constant-temperature crystal oscillator and synchronous control method - Google Patents
Clock source device based on GPS (global positioning system) and constant-temperature crystal oscillator and synchronous control method Download PDFInfo
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Abstract
The invention relates to a clock source device based on a GPS (global positioning system) and a constant-temperature crystal oscillator and a synchronous control method. The clock source device comprises a constant-temperature crystal oscillator module, a master control module, a GPS module, a narrowing circuit module and an auxiliary control module and the like, wherein the constant-temperature crystal oscillator module is connected with the auxiliary control module, the GPS module receives satellite pulse-per-second signals, the auxiliary control module resets a fractional-frequency submodule therein at the regular time according to the satellite pulse-per-second signals and eliminates accumulated errors of the constant-temperature crystal oscillator. The synchronous control method includes calibrating crystal oscillator phase voltage; receiving satellite signals by the GPS module; inputting selected frequency signals to the main control module through a key module; sending the GPS pulse-per-second signals which are subjected to narrowing treatment into the auxiliary control module; sending clock frequency signals of the constant-temperature crystal oscillator module into the auxiliary control module; resetting the fractional-frequency submodule by the auxiliary control module at the regular time according to GPS signals; and selecting signal output frequency signals according to frequency. The frequency signals and UTC (universal time coordinated) are synchronous by the aid of the GPS combined with the constant-temperature crystal oscillator, and the phase error is smaller than 100ns.
Description
(1) technical field
The present invention relates to the synchronous control technique field, be specially a kind of clock source device and synchronisation control means based on GPS and constant-temperature crystal oscillator.
(2) background technology
The transient electromagnetic detecting method is a kind of effective ways of geology detecting, is specially adapted to aspects such as ore deposit class material exploration, groundwater exploration, underground cavity detection.According to time-domain transient electromagnetic method principle; What receiver received is the pure secondary field that transmitter outage back is produced by underground geologic bodies; This just requires the necessary strict synchronism of Receiver And Transmitter; And synchronous error is at least less than 1 μ s, and so harsh synchronization accuracy is one of the key technology of transient electromagnetic detecting system just.Because transmitter spatially separates with receiver, this just need be the isochronous controller of transient electromagnetic measuring system specialized designs transmitter and receiver.
The transient electromagnetic detecting system realizes that the synchronous method of transmitter and receiver is mainly three kinds both at home and abroad at present: wired connection is synchronous, and wireless telecommunications are synchronous and the high-precision quartz clock is synchronous.These three kinds of method for synchronous all have bigger drawback, and it is a kind of cost-effective simultaneous techniques at transmitter and receiver when nearer that line locking is arranged, but when transmitter and receiver apart from each other, being difficult to adopt has line locking; Wireless telecommunications do not receive the influence of transmitter and receiver distance synchronously, are a kind of methods relatively more commonly used, disturb but be subject to the external environment factor; High-precision quartz clock method for synchronous is reliably effective, but the high-precision quartz clock costs an arm and a leg and the presynchronization time is longer.
(3) summary of the invention
The purpose of this invention is to provide a kind of clock source device based on GPS and constant-temperature crystal oscillator, be furnished with GPS receiver and constant-temperature crystal oscillator, the two cooperates, and improves synchronous precision and stability.
Another object of the present invention provides the synchronisation control means of above-mentioned clock source device based on GPS and constant-temperature crystal oscillator; The calibration of constant-temperature crystal oscillator phase voltage; GPS module receiving satellite signal; By the frequency signal that key-press module is selected to the main control module input, the GPS pps pulse per second signal is eliminated constant-temperature crystal oscillator module error, selects the accurate frequency signal of stable output signal by frequency.
The clock source device based on GPS and constant-temperature crystal oscillator of the present invention design comprises constant-temperature crystal oscillator module and main control module, also comprises the GPS module, the circuit module that narrows and from controlling module.Main control module connects from the control module, and the two paths of signals one tunnel of GPS module output inserts main control module, another road is inserted from the control module through the circuit module that narrows, and the constant-temperature crystal oscillator module inserts from the control module.The GPS information that main control module receives shows on display module, and confirms the GPS location according to this effectively.
Main control module is a singlechip controller, is connected to display module and key-press module, by the required frequency values of key-press module input user, shows the information such as locating information, current output frequency and battery electric quantity of GPS at display module.
GPS (GPS is the abbreviation of Global Positioning System, i.e. global positioning system) module is the GPS receiver, receives the two-way pulse per second (PPS) time signal of satellite.This pps pulse per second signal and universal time UTC are synchronous, do not have accumulated error, are used for the frequency division submodule timing reset from the control module, regularly eliminate the accumulated error of constant-temperature crystal oscillator, make it also synchronous with universal time UTC.
The constant-temperature crystal oscillator of constant-temperature crystal oscillator module has phase voltage to regulate port, connects potentiometer, regulates its phase voltage.
The frequency signal that the constant-temperature crystal oscillator module produces directly inserts from the control module, carries out frequency division N time, and the required synchronous different frequency signals of output user makes the multiple devices synchronous working.
Narrow circuit module with the processing that narrows of the pps pulse per second signal of GPS module output; The square-wave signal of GPS pps pulse per second signal 100ms is become the burst pulse that fixed width reaches 200ns, use for frequency division submodule from the control module.
From the master chip of control module is CPLD (abbreviation of Complex Programmable Logic Device, i.e. CPLD controller) chip.Comprise that from the control module frequency division submodule and programmed control frequency produce submodule.Programmed control frequency produces submodule and at first judges the frequency signal frequency division number of times that the constant-temperature crystal oscillator module is imported according to user's frequency selection signal that main control module sends; And regularly the frequency division submodule is resetted according to the GPS pps pulse per second signal, make it synchronous with universal time.
Also be connected to the bipolar signal conversion module from the control module, export bipolarity ripple signal on demand.
The constant-temperature crystal oscillator module also is connected to crystal oscillator self-adjusting module, under the disarmed state of GPS module location, produces pps pulse per second signal by the constant-temperature crystal oscillator module and replaces gps signal, keeps high accuracy output.Per 1～2 hour of crystal oscillator self-adjusting module is to the constant-temperature crystal oscillator adjustment that once resets, to avoid the influence to this clock apparatus precision of accumulated error that constant-temperature crystal oscillator itself exists.
The synchronisation control means of the clock source device based on GPS and constant-temperature crystal oscillator provided by the invention comprises the steps:
The constant-temperature crystal oscillator of I, constant-temperature crystal oscillator module carries out the phase voltage calibration,
Regulate the constant-temperature crystal oscillator phase voltage of constant-temperature crystal oscillator module and regulate the potentiometer that port connect, the constant-temperature crystal oscillator phase error that makes 2 clock apparatus is less than 1 μ s;
II, GPS module receive time signal by satellite, and the GPS pps pulse per second signal is sent into main control module and narrowed circuit module;
III, the frequency signal of selecting to main control module input by key-press module;
IV, the circuit module that narrows be the processing that narrows of GPS pps pulse per second signal, and output to from the control module;
V, constant-temperature crystal oscillator module output 10MHZ clock frequency signal arrive from the control module;
VI, from the control module GPS pps pulse per second signal is counted and whenever to be detected 8 pulse per second (PPS)s and then frequency division module is carried out a reset operation; When producing frequency do; 0.125hz, when 0.25hz, 2.5hz, 6.25hz and 25hz; Clock resetted once in per 8 seconds, can accurately produce frequency signal less than 1Hz;
VII, main control module select signal to be input to from the control module frequency; Select signal to handle from the frequency that the control module provides pps pulse per second signal, constant-temperature crystal oscillator clock signal and main control module, the frequency signal that output needs.
The frequency that the user selects to export among the Step II I is a; In the said step VI, comprise that from the control module frequency division submodule and programmed control frequency produce submodule; The frequency a that the programmed control frequency generation module is selected to export according to user among the Step II I confirms the frequency division number of times b of frequency division submodule, when the frequency signal of constant-temperature crystal oscillator module output is 10MHz, and 1Mhz=10
6Hz then has a=(10/b) * 10
6After hz, programmed control frequency produce submodule and calculate, by the frequency division submodule signal of constant-temperature crystal oscillator input is carried out frequency division and obtain required output frequency.
The constant-temperature crystal oscillator module also is connected to crystal oscillator self-adjusting module, under the disarmed state of GPS module location, produces pps pulse per second signal by the constant-temperature crystal oscillator module and replaces gps signal among the said step V; In the said step VI, per 1～2 hour of crystal oscillator self-adjusting module is to the constant-temperature crystal oscillator adjustment that once resets, to avoid the influence to this clock apparatus precision of accumulated error that constant-temperature crystal oscillator itself exists.
When being connected to the bipolar signal conversion module, after its conversion, select to export the bipolarity frequency signal by the user from control module output frequency from the control module.
The present invention is based on the clock source device of GPS and constant-temperature crystal oscillator and the advantage of synchronisation control means is: 1, the pps pulse per second signal under the situation of location, exported of GPS receiver has high precision and stability, and does not receive the distance and the influence of topography; And constant-temperature crystal oscillator can keep very high stability in a short time, is not subject to external condition and disturbs; The two combination makes the clock source device output frequency accurate synchronously in the pulse per second (PPS) of GPS receiver output; That is to say make frequency signal and world concordant time UTC (Universal Time Coordinated; UTC) time keeps synchronously; Eliminated the accumulated error of constant-temperature crystal oscillator, the synchronous signal frequency phase shift errors of output is less than 100ns; 2, when the GPS module can not reliably be located; Replace gps signal by the exportable pulse per second (PPS) of constant-temperature crystal oscillator module; The synchronous output that keeps this device; Under the invalid situation of GPS location, its frequency accuracy can maintain the interior duration of 1 μ s scope in 5 hours, had solved the short-duration failure problem of GPS in the actual transient electromagnetic detecting; 3, constant-temperature crystal oscillator self-adjusting module can regularly be adjusted the constant-temperature crystal oscillator module and reset, and eliminates its accumulated error, guarantees the synchronization accuracy of output signal; 4, can carry out the bipolarity conversion to the output signal, satisfy the requirement of adopting bipolarity ripple signal in the transient electromagnetic detecting; 5, be adapted to transient electromagnetic detecting field and CDMA and various instrument, instrument and the system harsh to the temporal frequency requirement.
(4) description of drawings
Fig. 1 is this clock source device example structure block diagram based on GPS and constant-temperature crystal oscillator
(5) embodiment
Clock source device embodiment based on GPS and constant-temperature crystal oscillator
This routine primary structure is as shown in Figure 1, comprise the GPS module, the circuit module that narrows, constant-temperature crystal oscillator module, crystal oscillator self-adjusting module, main control module, from control module and bipolar signal conversion module.Main control module connects from the control module, and the two paths of signals one tunnel of GPS module output inserts main control module, another road is inserted from the control module through the circuit module that narrows, and the constant-temperature crystal oscillator module inserts from the control module.The constant-temperature crystal oscillator module connects crystal oscillator self-adjusting module.Also connect the bipolar signal conversion module from the control module.Right 2 of figure point to right-hand arrows and represent to export signal, i.e. synchronous different frequency signals and the bipolar signal selected of user.
This routine main control module is a singlechip controller, is connected to display module and key-press module.
This example is the CPLD chip from the master chip of control module, comprises that frequency division submodule and programmed control frequency produce submodule.
The GPS module is the GPS receiver, and supporting provides accurate time service service to the application of strict positioning requirements; Can under the situation of having only a satellite, carry out GPS time service service in static running status, reduce the time service mistake that possibly cause because the location is wrong; This GPS module is used the quantization error that quantizes control information compensation clock pulse simultaneously, and precision can be up to 15ns.Under the situation that GPS effectively locatees, this GPS module can be exported the two-way pps pulse per second signal, and this signal Synchronization universal time UTC, does not have accumulated error; GPS pulse per second (PPS) temporal information is " reference point " that is used for taming the constant-temperature crystal oscillator module in this example; When each GPS pps pulse per second signal arrives; From the control module count, the per 8 seconds accumulated errors with this signal timing elimination constant-temperature crystal oscillator module make this routine clock source precision reach 100ns.
This routine constant-temperature crystal oscillator module adopts nominal 10,000, the constant-temperature crystal oscillator of 000Hz, and its temperature stability can be up to ± 5*10
-11, ageing rate can be low to moderate 5*10
-9Year, and very low to the change sensitivity of surrounding environment.The constant-temperature crystal oscillator of this routine constant-temperature crystal oscillator module has the phase voltage that connects potentiometer to regulate port.
Synchronisation control means embodiment based on the clock source device of GPS and constant-temperature crystal oscillator
This routine synchronisation control means comprises the steps:
The constant-temperature crystal oscillator of I, constant-temperature crystal oscillator module carries out the phase voltage calibration,
Regulate the constant-temperature crystal oscillator phase voltage of constant-temperature crystal oscillator module and regulate the potentiometer that port connect, the constant-temperature crystal oscillator phase error that makes 2 clock apparatus is less than 1 μ s;
II, GPS module receive time signal by satellite, and the GPS pps pulse per second signal is sent into the circuit module that narrows;
III, the frequency signal of selecting to main control module input by key-press module;
IV, the circuit module that narrows be the processing that narrows of GPS pps pulse per second signal, and output to from the control module;
V, constant-temperature crystal oscillator module output 10MHZ clock frequency signal arrive from the control module;
VI, from the control module GPS pps pulse per second signal is counted and whenever to be detected 8 pulse per second (PPS)s and then frequency division module is carried out a reset operation, also be per 8 seconds to clock once, with the frequency signal of accurate generation less than 1Hz;
VII, main control module select signal to be input to from the control module frequency; Select signal to handle from the frequency that the control module provides pps pulse per second signal, constant-temperature crystal oscillator clock signal and main control module, the frequency signal that output needs.
In the said step VI; Comprise that from the control module frequency division submodule and programmed control frequency produce submodule; Programmed control frequency produces submodule and calculates the frequency division number of times according to the frequency of main control module customer requirements output and the frequency signal of constant-temperature crystal oscillator module output, and the signal of the constant-temperature crystal oscillator module being imported by the frequency division submodule carries out frequency division and obtains required output frequency.
Under the disarmed state of GPS module location, said step V produces pps pulse per second signal by the constant-temperature crystal oscillator module and replaces gps signal; In the said step VI, per 1～2 hour of crystal oscillator self-adjusting module is to the constant-temperature crystal oscillator adjustment that once resets.
When being connected to the bipolar signal conversion module, after its conversion, select to export the bipolarity frequency signal by the user from control module output frequency from the control module.
The foregoing description is merely concrete example to the object of the invention, technical scheme and beneficial effect further explain, and the present invention is defined in this.All any modifications of within scope of disclosure of the present invention, being made, be equal to replacement, improvement etc., all be included within protection scope of the present invention.
Claims (9)
1. based on the clock source device of GPS and constant-temperature crystal oscillator, comprise constant-temperature crystal oscillator module and main control module, it is characterized in that:
Also comprise the GPS module, the circuit module that narrows and from the control module; Main control module connects from the control module, and the two paths of signals one tunnel of GPS module output inserts main control module, another road is inserted from the control module through the circuit module that narrows, and the constant-temperature crystal oscillator module inserts from the control module;
Main control module is a singlechip controller, is connected to display module and key-press module;
The GPS module is the GPS receiver of the two-way pulse per second (PPS) time signal of reception satellite;
Said constant-temperature crystal oscillator module is a constant-temperature crystal oscillator.
2. the clock source device based on GPS and constant-temperature crystal oscillator according to claim 1 is characterized in that:
The constant-temperature crystal oscillator of said constant-temperature crystal oscillator module has phase voltage to regulate port, connects potentiometer.
3. the clock source device based on GPS and constant-temperature crystal oscillator according to claim 1 and 2 is characterized in that:
Said master chip from the control module is the CPLD chip, comprises that frequency division submodule and programmed control frequency produce submodule.
4. the clock source device based on GPS and constant-temperature crystal oscillator according to claim 1 is characterized in that:
Said from the control module also be connected to the bipolar signal conversion module.
5. the clock source device based on GPS and constant-temperature crystal oscillator according to claim 1 and 2 is characterized in that:
Said constant-temperature crystal oscillator module also is connected to crystal oscillator self-adjusting module.
6. the synchronisation control means of the clock source device based on GPS and constant-temperature crystal oscillator according to claim 2 is characterized in that comprising the steps:
The constant-temperature crystal oscillator of I, constant-temperature crystal oscillator module carries out the phase voltage calibration;
Regulate the constant-temperature crystal oscillator phase voltage of constant-temperature crystal oscillator module and regulate the potentiometer that port connect, the constant-temperature crystal oscillator phase error that makes 2 clock apparatus is less than 1 μ s;
II, GPS module receive time signal by satellite, and the GPS pps pulse per second signal is sent into the circuit module that narrows;
III, the frequency signal of selecting to main control module input by key-press module;
IV, the circuit module that narrows be the processing that narrows of GPS pps pulse per second signal, and output to from the control module;
V, constant-temperature crystal oscillator module output 10MHZ clock frequency signal arrive from the control module;
VI, from the control module GPS pps pulse per second signal is counted and whenever to be detected 8 pulse per second (PPS)s and then frequency division module is carried out a reset operation, also be per 8 seconds to clock once, with the frequency signal of accurate generation less than 1Hz;
VII, main control module select signal to be input to from the control module frequency; Select signal to handle from the frequency that the control module provides pps pulse per second signal, constant-temperature crystal oscillator clock signal and main control module, the frequency signal that output needs.
7. the synchronisation control means of the clock source device based on GPS and constant-temperature crystal oscillator according to claim 6 is characterized in that:
The frequency that the user selects to export among the Step II I is a; In the said step VI, comprise that from the control module frequency division submodule and programmed control frequency produce submodule; B is a programmed control frequency generation module undetermined parameter, and the frequency signal of exporting when the constant-temperature crystal oscillator module is 10MHz, and a=(10/b) * 10 is then arranged
6Hz carries out frequency division by the signal of after frequency division submodule and the calculating of programmed control frequency generation submodule constant-temperature crystal oscillator being imported and obtains required output frequency.
8. the synchronisation control means of the clock source device based on GPS and constant-temperature crystal oscillator according to claim 6 is characterized in that:
The constant-temperature crystal oscillator module also is connected to crystal oscillator self-adjusting module, under the disarmed state of GPS module location, produces pps pulse per second signal by the constant-temperature crystal oscillator module and replaces gps signal among the said step V; In the said step VI, per 1～2 hour of crystal oscillator self-adjusting module is to the constant-temperature crystal oscillator adjustment that once resets.
9. the synchronisation control means of the clock source device based on GPS and constant-temperature crystal oscillator according to claim 6 is characterized in that:
When being connected to the bipolar signal conversion module, after its conversion, select to export the bipolarity frequency signal by the user from control module output frequency from the control module.
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| CN103616668A (en) * | 2013-11-13 | 2014-03-05 | 桂林电子科技大学 | Novel TVLF water probing radar synchronous system |
| CN103901271A (en) * | 2012-12-25 | 2014-07-02 | 东莞市泰斗微电子科技有限公司 | Frequency test method and frequency test system |
| CN104135332A (en) * | 2014-07-11 | 2014-11-05 | 北京工业大学 | GPS (Global Positioning System) time synchronization device used for high-power electromagnetic transmitter |
| CN105044781A (en) * | 2015-06-04 | 2015-11-11 | 成都理工大学 | System and method for generating synchronous transient electromagnetic signal source |
| CN106527113A (en) * | 2016-10-31 | 2017-03-22 | 国网福建省电力有限公司 | High-precision clock online frequency calibration and timing method based on GPS |
| CN108594633A (en) * | 2018-07-02 | 2018-09-28 | 国家电网有限公司 | A kind of electric energy meter dual time base timing device and method |
| CN108599758A (en) * | 2018-02-10 | 2018-09-28 | 国网河南省电力公司郑州供电公司 | The algorithm and device of high-precision trigger pulse are generated based on GPS |
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| CN109188335A (en) * | 2018-08-14 | 2019-01-11 | 四川通利源电力科技有限公司 | Clock of power meter offset detection system and method |
| CN110824891A (en) * | 2019-11-15 | 2020-02-21 | 上海航天控制技术研究所 | Semi-physical simulation time correction system and method suitable for double-star formation |
| CN111954295A (en) * | 2017-12-19 | 2020-11-17 | 安科讯(福建)科技有限公司 | Time and precision considered synchronization maintaining method and system for TDD-LTE (time division Duplex-Long term evolution) equipment |
| CN113419286A (en) * | 2021-06-21 | 2021-09-21 | 中国科学院地质与地球物理研究所 | High-precision frequency synthesis compensation method for complementation of satellite and constant-temperature crystal oscillator |
| CN113608428A (en) * | 2021-07-26 | 2021-11-05 | 中国科学院国家空间科学中心 | Method for realizing synchronization of multi-satellite inter-satellite pulse per second and clock |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201957031U (en) * | 2011-02-25 | 2011-08-31 | 深圳市夏光通信测量技术有限公司 | IEEE1588 time analyzer |
| CN202364237U (en) * | 2011-10-28 | 2012-08-01 | 桂林电子科技大学 | Clock source device based on GPS (global positioning system) and constant-temperature crystal oscillator |
-
2011
- 2011-10-28 CN CN2011103324140A patent/CN102510320A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201957031U (en) * | 2011-02-25 | 2011-08-31 | 深圳市夏光通信测量技术有限公司 | IEEE1588 time analyzer |
| CN202364237U (en) * | 2011-10-28 | 2012-08-01 | 桂林电子科技大学 | Clock source device based on GPS (global positioning system) and constant-temperature crystal oscillator |
Non-Patent Citations (3)
| Title |
|---|
| 张瑞涛，贾洪峰，崔少辉: "一种通用精确同步源的设计与实现", 《***工程与电子技术》 * |
| 杨永标，杨晓渝，周捷: "利用FPGA实现GPS失步下精确守时", 《电力自动化设备》 * |
| 陈靖，张承学，刘延华，姜建，肖怡安: "GPS失步后时钟信号的CPLD实现方法", 《电力***自动化》 * |
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| CN103901271B (en) * | 2012-12-25 | 2015-06-03 | 泰斗微电子科技有限公司 | Frequency test method and frequency test system |
| CN103616668A (en) * | 2013-11-13 | 2014-03-05 | 桂林电子科技大学 | Novel TVLF water probing radar synchronous system |
| CN104135332A (en) * | 2014-07-11 | 2014-11-05 | 北京工业大学 | GPS (Global Positioning System) time synchronization device used for high-power electromagnetic transmitter |
| CN104135332B (en) * | 2014-07-11 | 2017-10-27 | 北京工业大学 | A kind of gps time sychronisation for great-power electromagnetic emitter |
| CN105044781A (en) * | 2015-06-04 | 2015-11-11 | 成都理工大学 | System and method for generating synchronous transient electromagnetic signal source |
| CN106527113A (en) * | 2016-10-31 | 2017-03-22 | 国网福建省电力有限公司 | High-precision clock online frequency calibration and timing method based on GPS |
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| CN111954295A (en) * | 2017-12-19 | 2020-11-17 | 安科讯(福建)科技有限公司 | Time and precision considered synchronization maintaining method and system for TDD-LTE (time division Duplex-Long term evolution) equipment |
| CN111954295B (en) * | 2017-12-19 | 2023-03-31 | 安科讯(福建)科技有限公司 | Time and precision considered synchronization maintaining method and system for TDD-LTE (time division Duplex-Long term evolution) equipment |
| CN108599758A (en) * | 2018-02-10 | 2018-09-28 | 国网河南省电力公司郑州供电公司 | The algorithm and device of high-precision trigger pulse are generated based on GPS |
| CN108599758B (en) * | 2018-02-10 | 2022-11-22 | 国网河南省电力公司郑州供电公司 | Algorithm and device for generating high-precision trigger pulse based on GPS |
| CN108594633A (en) * | 2018-07-02 | 2018-09-28 | 国家电网有限公司 | A kind of electric energy meter dual time base timing device and method |
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| CN113608428A (en) * | 2021-07-26 | 2021-11-05 | 中国科学院国家空间科学中心 | Method for realizing synchronization of multi-satellite inter-satellite pulse per second and clock |
| CN113608428B (en) * | 2021-07-26 | 2022-07-12 | 中国科学院国家空间科学中心 | Method for realizing synchronization of multi-satellite inter-satellite pulse per second and clock |
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Application publication date: 20120620 |