CN204065693U - High precision distributed synchronization clock system - Google Patents
High precision distributed synchronization clock system Download PDFInfo
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- CN204065693U CN204065693U CN201420425851.6U CN201420425851U CN204065693U CN 204065693 U CN204065693 U CN 204065693U CN 201420425851 U CN201420425851 U CN 201420425851U CN 204065693 U CN204065693 U CN 204065693U
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Abstract
The utility model discloses a kind of high precision distributed synchronization clock system, adopt the distributed synchronization mode that combines with constant-temperature crystal oscillator of GPS, namely calculate temporal information, locating information produce the local pps pulse per second signal that 1PPS signal goes correction constant-temperature crystal oscillator module to produce and make local pps pulse per second signal synchronous with 1PPS signal by GPS module.Have additional visualizer of the present utility model like this and can realize multiple spot distributed synchronization, and there is very high synchronization accuracy, and when synchronous data sampling, correct time record can be carried out, in addition, can locate accurately the dimensional orientation of data collection point.After one or multiple stage GPS were lost efficacy, then the pulse per second (PPS) utilizing local constant-temperature crystal oscillator to produce replaced 1PPS signal to carry out synchronously, and synchronous working can reach half an hour more than effective time.
Description
Technical field
The utility model relates to fine motion prospecting technique field, is specifically related to a kind of high precision distributed synchronization clock system.
Background technology
The epigeosphere moment also exists non-seismic faint vibrations and is called fine motion.Research shows, the structure of shallow crust medium is reflected in microtremor observation, by the weak vibration situation of geologize medium, can infer the structure on stratum, form fine motion investigation method.Fine motion investigation method utilizes the collection of microtremor observation instrument to receive the incoming wave of earth's surface all directions, extracts dispersion curve by spatial autocorrelation (SPAC) method, obtains the geophysical reconnaissance method of S Wave Velocity Structure through inverting.When Rayleigh waves dispersion curve being extracted to micro-tremor signal by SPAC method, not only require observation array be rule the circular array (namely as shown in Figure 1, each visualizer distributes along concentric circles, and at least circumferentially arranging three visualizers at equal intervals), and to the collection of data, there is strict synchronous requirement.
Realizing the high-precise synchronization of each visualizer to data acquisition in the array is one of gordian technique of fine motion exploration.At present, realizing the main method that in the array, each visualizer is synchronous is wired synchronization, and wireless telecommunications are synchronous, synchronous three kinds of high-precision quartz clock.And these three kinds of synchronous method all exist respective drawback, as wired synchronization is difficult to realize remote synchronous; Wireless telecommunications are synchronously subject to such environmental effects; High-precision quartz clock is expensive and the presynchronization time is long, and these drawbacks all will reduce the precision of exploration greatly, even cause the consequence that cannot survey.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of high precision distributed synchronization clock system, and it can carry out multiple spot distributed synchronization, and has the feature of synchronization accuracy height and good stability.
For solving the problem, the utility model is achieved through the following technical solutions:
High precision distributed synchronization clock system, forms primarily of GPS module, stability judging module, constant-temperature crystal oscillator module, frequency multiplier module, allocator module, time interval measurement module and digital-to-analog conversion conditioning module; Wherein the temporal information output terminal of GPS module connects visualizer, and the 1PPS signal output part of GPS module is connected with an input end of time interval measurement module through stability judging module; The output terminal of constant-temperature crystal oscillator module is through the input end of frequency multiplier model calling allocator module; The output terminal of allocator module is divided into two-way, and a road connects visualizer, another input end of another road tie-time interval measurement module; The input end of the output terminal linking number mode convertion conditioning module of time interval measurement module, the output terminal of digital-to-analog conversion conditioning module is connected with the control end of constant-temperature crystal oscillator module.
In said system, described GPS module is also provided with locating information output terminal.
In said system, the temporal information output terminal of described GPS module is connected with a liquid crystal display with locating information output terminal simultaneously.
Compared with prior art, the utility model has following features:
1, high, the good stability of precision, compared with the synchronous clock produced, has higher synchronous clock precision with traditional GPS, and after one or multiple stage GPS were lost efficacy, the effective time can continuing high-precise synchronization was long.
2, multiple spot distributed synchronization, for meeting the needs of data acquisition, can realize carrying out synchronously with in-plant multiple point at a distance simultaneously.
3, location and time interocclusal record, correct time record and space orientation can be carried out to each data collection point distributed, the sampling instant knowing data that can clearly understand, for scopic field layout provides dimensional orientation definitely.
Accompanying drawing explanation
Fig. 1 is microtremor observation array schematic diagram.In figure ,-represent survey line, zero represents measuring point, ● represent center measuring point.
Fig. 2 is high precision distributed synchronization clock system schematic diagram.
Fig. 3 is 1PPS judgement of stability schematic diagram.
Fig. 4 is clock phase-splitting sequential chart.
Embodiment
A kind of high precision distributed synchronization clock system, as shown in Figure 2, form primarily of GPS module, stability judging module, constant-temperature crystal oscillator module, frequency multiplier module, allocator module, time interval measurement module, digital-to-analog conversion conditioning module and liquid crystal display.Wherein the locating information output terminal of GPS module is connected with liquid crystal display, by the locating information calculated, can the laying of supplementary observation instrument, and each visualizer is circumferentially being equally spaced.The temporal information output terminal of GPS module connects visualizer, and by the temporal information calculated, the data that can collect visualizer carry out time mark.The 1PPS signal output part of GPS module is connected with an input end of time interval measurement module through stability judging module.In order to intuitively show time and locating information, the temporal information output terminal of described GPS module is also connected with a liquid crystal display with locating information output terminal simultaneously.The output terminal of constant-temperature crystal oscillator module connects the input end of frequency multiplier module.The output terminal of frequency multiplier module connects the input end of allocator module.The output terminal of allocator module is divided into two-way, and a road connects visualizer, another input end of another road tie-time interval measurement module.The input end of the output terminal linking number mode convertion conditioning module of time interval measurement module, the output terminal of digital-to-analog conversion conditioning module is connected with the control end of constant-temperature crystal oscillator module.
As shown in Figure 3, the counter module in this stability judging module is designed by CPLD the principle of stability judgement, and CLK clock is provided by constant-temperature crystal oscillator.Can 10 be reached according to constant-temperature crystal oscillator degree of stability in a short time
-12therefore Hz will be very high at the counting precision of 1s inside counting device.Counting the 1s time then counter module export a high level, namely open one " wicket " and send into AND circuit, only just can obtain real 1PPS signal in effective second when signal arrives, eliminate the stochastic error of 1PPS signal, realize 1PPS hardware anti-interference method by the design of this thought.
Time measurement module utilizes clock phase-splitting method to measure the mistiming of local pulse per second (PPS) and 1PPS signal.Clock phase-splitting method is after clock is made certain time-delay, then counts signal with the clock after former clock and time delay respectively simultaneously, thus improves the method for measuring accuracy.Its realization depends on the stability of delay unit, and resolution depends on the delay time of unit delay unit.Fig. 4 is the sequential chart of 4 grades of clock phase-splittings.If clock frequency is 100MHz, then the cycle is 10ns.By the clock signal of 100MHz through 3 time delays, each delayed phase 90 °, namely delay time is 2.5ns, obtains clock CLK2, CLK3, CLK4, and time delay sum just covers one-period.With the rising edge of SIG as count start signal, the negative edge of SIG is as count end signal, and CLK1 can remember 4 clocks (rising edge clock number), and measurement result is 40ns, and its resolution is 10ns.Adopt clock phase-splitting method to calculate, 4 road clocks amount to obtain 15 clock period, and namely rising edge number is 15.Clock is superposed to a road to calculate, then Δ T=15 × 2.5=37.5ns, resolution is 2.5ns, namely improves 4 times by 4 road clock phase-splitting mensuration resolution compared with 1 road clock.In time interval module, the rising edge that 1PPS signal and local pps pulse per second signal first arrive is as count start signal, and the signal of rear arrival, as count end signal, obtains both mistiming △ T.
Each visualizer in the fine motion array adopts independently observed pattern, and scopic geophone is amplified by prime amplifier after receiving signal, then by AD converter to synchronous data sampling, can effectively reduce data acquisition errors like this.The synchronizing function of synchronous data sampling is completed by GPS and the complementary co-ordination of constant-temperature crystal oscillator.By being all provided with a high precision distributed synchronization clock system on every platform visualizer, can allow the multiple stage visualizer be in same observation array, can carry out multiple spot distributed synchronization, and have very high synchronization accuracy, synchronization accuracy is better than 200ns.And when synchronous data sampling, can correct time record be carried out, and can locate accurately the dimensional orientation of data collection point.In addition, the utility model is after one or multiple stage GPS Module Fail, then the pulse per second (PPS) utilizing local constant-temperature crystal oscillator to produce replaces 1PPS signal to carry out synchronously, and synchronous working can reach half an hour more than effective time.
Claims (3)
1. high precision distributed synchronization clock system, is characterized in that: form primarily of GPS module, stability judging module, constant-temperature crystal oscillator module, frequency multiplier module, allocator module, time interval measurement module and digital-to-analog conversion conditioning module; Wherein the temporal information output terminal of GPS module connects visualizer, and the 1PPS signal output part of GPS module is connected with an input end of time interval measurement module through stability judging module; The output terminal of constant-temperature crystal oscillator module is through the input end of frequency multiplier model calling allocator module; The output terminal of allocator module is divided into two-way, and a road connects visualizer, another input end of another road tie-time interval measurement module; The input end of the output terminal linking number mode convertion conditioning module of time interval measurement module, the output terminal of digital-to-analog conversion conditioning module is connected with the control end of constant-temperature crystal oscillator module.
2. high precision distributed synchronization clock system according to claim 1, is characterized in that: described GPS module is also provided with locating information output terminal.
3. high precision distributed synchronization clock system according to claim 2, is characterized in that: the temporal information output terminal of described GPS module is connected with a liquid crystal display with locating information output terminal simultaneously.
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| CN201420425851.6U CN204065693U (en) | 2014-07-30 | 2014-07-30 | High precision distributed synchronization clock system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122789A (en) * | 2014-07-30 | 2014-10-29 | 桂林电子科技大学 | High-precision distributed synchronous clock system and method |
| CN108427263A (en) * | 2017-02-13 | 2018-08-21 | 工业和信息化部电信研究院 | A kind of enhanced time server based on optical frequency com |
-
2014
- 2014-07-30 CN CN201420425851.6U patent/CN204065693U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122789A (en) * | 2014-07-30 | 2014-10-29 | 桂林电子科技大学 | High-precision distributed synchronous clock system and method |
| CN108427263A (en) * | 2017-02-13 | 2018-08-21 | 工业和信息化部电信研究院 | A kind of enhanced time server based on optical frequency com |
| CN108427263B (en) * | 2017-02-13 | 2020-04-21 | 工业和信息化部电信研究院 | Enhanced time server based on optical frequency comb |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20170730 |
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| CF01 | Termination of patent right due to non-payment of annual fee |