CN201266923Y - GPS combined time frequency instrument - Google Patents
GPS combined time frequency instrument Download PDFInfo
- Publication number
- CN201266923Y CN201266923Y CNU2008201103467U CN200820110346U CN201266923Y CN 201266923 Y CN201266923 Y CN 201266923Y CN U2008201103467 U CNU2008201103467 U CN U2008201103467U CN 200820110346 U CN200820110346 U CN 200820110346U CN 201266923 Y CN201266923 Y CN 201266923Y
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- gps receiver
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Abstract
The utility model discloses a GPS assembly time frequency meter, comprising a GPS receiver, a locked frequency scale and a phase-locking circuit; the GPS receiver is used for obtaining data information of a GPS satellite; simultaneously, the GPS receiver can output second impulse signals; the locked frequency scale can provide stable frequency signals; the second impulse signals of the GPS receiver and frequency-division second signals of the locked frequency scale are sent to the phase-locking circuit; the phase-locking circuit obtains a time difference curve of the frequency-division second signals of the locked frequency scale and the second impulse signals of the GPS receiver by calculating the time difference of a plurality of GPS second signals and the frequency-division second signals of the locked frequency scale; the phase-locking circuit converts the time difference curve into slowly-changing direct current signals and feedbacks the direct current signals to the locked frequency scale; and the locked frequency scale receives the direct current signals and controls the direct current signals to generate frequency signals close to the GPS standard frequency. The frequency meter can lead the precision of the second signals output by the locked frequency scale and UTC second to reach ns magnitude synchronously.
Description
Technical field
The utility model is about high precision time frequency standard technology, is specifically related to a kind of GPS assembly time frequency recorder.
Background technology
High-precision frequency standard has three kinds of quartz frequency standard, rubidium atomic oscillator and caesium/hydrogen atomic frequency standards, wherein, cesium atomic frequency standard (or hydrogen atomic frequency standard), have outstanding frequency accuracy, make an appointment with (1E-12), can greatly satisfy most of users' demand, but this class frequency marking costs an arm and a leg, environment for use requires high, and equipment volume is big, China at present also ability do not produce this series products.Therefore, Chang Yong frequency standard is quartz frequency standard and rubidium atomic oscillator.
The quartz frequency standard is called for short crystal oscillator, is to use maximum frequency standards.It utilizes the piezoelectric effect characteristic of crystal to work.Because volume is little, low price, widespread usage is in every field, and the user can select different products according to the needs of oneself.Its shortcoming is that the frequency aging rate is big, and it is also big to be acted upon by temperature changes, and makes it be subjected to certain restriction in high-end applications.Rubidium atomic oscillator is to utilize the rubidium atom that transition takes place under given conditions and produce the more accurate and stable electromagnetic mechanism of frequency ratio and the atomic oscillator made claims rubidium atomic oscillator.It is better because of frequency accuracy, the stability height, and volume is little, and low price is firmly got user's favor.But also because the frequency accuracy that its frequency drift and temperature characterisitic have influenced it, general frequency accuracy is only about (1E-10), in order not influence use, the user must often calibrate the frequency of its generation by the configuration frequency calibrator (-ter) unit, can keep higher frequency accuracy.
In sum, more and more higher along with science and technology development to the required precision of frequency standard, the demand that quartz frequency standard commonly used and rubidium atomic oscillator can't satisfy the user.
The utility model content
The utility model overcomes the deficiencies in the prior art, and a kind of high accurate GPS assembly time frequency recorder is provided.
The technical solution of the utility model is:
A kind of GPS assembly time frequency recorder, it is characterized in that, comprise a GPS receiver, one by a frequency locking mark and a phase lock circuitry, described GPS receiver is used to obtain the data message of gps satellite, simultaneously, the exportable pps pulse per second signal of described GPS receiver, described being marked by frequency locking can provide stable frequency signal, arrive described phase lock circuitry with the pps pulse per second signal of GPS receiver with by frequency locking target frequency division signal second (this machine signal second) synchronized transmission, the time difference of this phase lock circuitry by calculating a plurality of GPS signals second and being marked frequency division signal second by frequency locking, draw by the deviation curve of the pps pulse per second signal of frequency locking target frequency division signal second and GPS receiver, described phase lock circuitry converts above-mentioned deviation curve the direct current signal that changes slowly to and feeds back to by frequency locking and marks, received above-mentioned direct current signal by the frequency locking tag splice, control its generation and approach GPS mark frequency signal frequently.
Described phase lock circuitry comprises that time difference measurement unit, Mathematical Modeling are used to measure the time difference of a plurality of GPS signals second and this machine signal second with microprocessor and D/A modular converter, described time difference measurement unit; Described Mathematical Modeling is used to receive the data of time difference measurement unit with microprocessor, and calculate, obtain by the deviation curve of the pps pulse per second signal of frequency locking target frequency and GPS receiver, described D/A modular converter becomes this deviation curve conversion and changes direct current signal slowly.
Decoding circuit when further comprising a frequency division is used for the pps pulse per second signal of above-mentioned GPS receiver and synchronous by frequency locking target frequency signal.
Described by frequency locking mark connection one amplifier, this amplifier is used to distinguish, amplify by the frequency signal of frequency locking mark output.
Be designated as a crystal oscillator by frequency locking.
Be designated as a rubidium atomic oscillator by frequency locking.
Compared with prior art, the beneficial effects of the utility model are:
Gps signal has the characteristics of whole world covering, all weather operations.Several high accuracy atom frequency markers are housed on the gps satellite, and continuously for position and temporal information accurately are provided for global user, the timing tracking accuracy that it provides can reach the ns magnitude round the clock, and frequency accuracy can be better than 10
-12Magnitude.The utility model utilizes the standard UTC time code signal and the pps pulse per second signal of GPS receiver output, as regularly and synchronizing signal by the frequency locking target, thereby guarantee to be marked exportable standard UTC time code signal by frequency locking, second signal and UTC synchronization accuracy second of its output can reach the ns magnitude.
After tested, 24 hours average frequency accuracy of the utility model is 1E-12; Ratio is by 1-2 magnitude of frequency locking absolute altitude, and accuracy is equivalent to expensive cesium atomic frequency standard.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
With reference to figure 1, the utility model GPS assembly time frequency recorder decoding circuit, amplifier and GPS receiver by by frequency locking mark, phase lock circuitry, frequency division the time are formed.
The utility model is Rb atom frequency marking or highly stable crystal oscillator by frequency locking mark (being blocked frequency standard), and it can provide the frequency signal of high stability.But native system requires the accuracy of frequency source higher; Timing tracking accuracy is also very high; The Rb atom frequency marking and the crystal oscillator that do not add locking, its output signal frequency are along with the variation of time is drifted about, if rubidium oscillator, drift rate is 5 * 10 after powering up one month continuously
-11/ month; As crystal oscillator, the ageing rate after powering up month continuously is 3 * 10
-11/ day.
As everyone knows, gps signal have close global covering, all weather operations, round the clock continuously for for global user provides multiple information, the timing tracking accuracy that it provides can reach the ns magnitude, frequency accuracy can be better than 10
-12Magnitude.But gps satellite is to move on the track away from more than 20 kilometer of the earth, the signal that they send will be through ionosphere, tropospheric propagation, make and increased some interference in the signal, after tested, in the C/A of GPS coded signal, under no SA (interference that the U.S. applies) RST, the shake of the 1ppsGPS of its output is about 10ns/ second, is equivalent to 1E-8.
Phase lock circuitry function of the present utility model has time difference measurement, obtains deviation curve and forms frequency control signal.
The mid-time difference measurement circuit of phase lock circuitry (certainty of measurement is adopted as 1ns or 10ns as required).It was measured by the time difference between the pps pulse per second signal of frequency locking target frequency division signal second (being this machine signal second) and GPS receiver, the 1ppsGPS time reference signal that the GPS receiver is sent is by frequency locking target normative reference, by the 1pps fractional frequency signal of frequency locking mark generation (by being produced through frequency division) by the frequency locking mark, it is measured signal, the time difference measurement circuit carries out repeatedly time difference measurement with them, concrete measurement number of times is decided as required, each equipment has nothing in common with each other, short is no less than 100 seconds, long arrives several hours, even more than 1 day.
The built-in Mathematical Modeling of phase lock circuitry a microprocessor and a D/A modular converter.Mass data that the time difference measurement circuit records is through level and smooth, filtering, handle calculating with microprocessor to data according to specific Mathematical Modeling, carry out the D/A conversion then and draw the direct current signal that changes slowly, this signal is sent to by frequency locking marks,, also claim to tame to being carried out FREQUENCY CONTROL with this signal by the frequency locking mark.Data volume is many more, and control precision is just high more, by the accuracy of frequency locking target output frequency just more near the frequency marking on the GPS star.
In the design, it is shorter to tame the phase lock circuitry time constant that the crystal oscillator of lower accuracy selects for use, and the required time of high stability crystal oscillator or atomic frequency standard of taming is just longer.
Through gps signal tame by the 10MHz standard-frequency signal of frequency locking mark output, pass through amplifier again after, can give each user and use; According to the UTC time code signal of required different sign indicating number types, decoding circuit produces as synchronizing signal with a GPS time code signal and a second signal during by frequency division; The 1pps signal is by being made 1pps (synchronously) signal that synchronous synchronous frequency divider produces by the 10MHz signal of frequency locking mark output with the 1ppsGPS signal as required, when this signal has the 1ppsGPS output signal at the GPS receiver, the starting point basically identical of the two, and 1pps (synchronously) signal also still has maintenance output when the gps signal losing lock.
More than by specific embodiment GPS provided by the utility model assembly time frequency recorder has been described, it will be understood by those of skill in the art that in the scope that does not break away from the invention essence, can make certain deformation or modification to the utility model.
Claims (6)
1, a kind of GPS assembly time frequency recorder, it is characterized in that, comprise a GPS receiver, one by a frequency locking mark and a phase lock circuitry, described GPS receiver is used to obtain the data message of gps satellite, simultaneously, the exportable pps pulse per second signal of described GPS receiver, described being marked by frequency locking can provide stable frequency signal, send to described phase lock circuitry with the pps pulse per second signal of GPS receiver with by frequency locking target frequency division signal Synchronization second, the time difference of this phase lock circuitry by calculating a plurality of GPS signals second and being marked frequency division signal second by frequency locking, draw by the deviation curve of the pps pulse per second signal of frequency locking target frequency division signal second and GPS receiver, described phase lock circuitry converts above-mentioned deviation curve the direct current signal that changes slowly to and feeds back to by frequency locking and marks, received above-mentioned direct current signal by the frequency locking tag splice, control its generation and approach GPS mark frequency signal frequently.
2, temporal frequency instrument as claimed in claim 1, it is characterized in that, described phase lock circuitry comprises that time difference measurement unit, Mathematical Modeling are used to measure the time difference of a plurality of GPS signals second and this machine signal second with microprocessor and D/A modular converter, described time difference measurement unit; Described Mathematical Modeling is used to receive the data of time difference measurement unit with microprocessor, and calculate, obtain by the deviation curve of the pps pulse per second signal of frequency locking target frequency and GPS receiver, described D/A modular converter becomes this deviation curve conversion and changes direct current signal slowly.
3, temporal frequency instrument as claimed in claim 1 or 2 is characterized in that, decoding circuit when also comprising a frequency division is used for the pps pulse per second signal of above-mentioned GPS receiver and synchronous by frequency locking target frequency signal.
4, temporal frequency instrument as claimed in claim 1 or 2 is characterized in that, described by frequency locking mark connection one amplifier, this amplifier is used to distinguish, amplify by the frequency signal of frequency locking mark output.
5, temporal frequency instrument as claimed in claim 1 is characterized in that, is designated as a crystal oscillator by frequency locking.
6, temporal frequency instrument as claimed in claim 1 is characterized in that, is designated as a rubidium atomic oscillator by frequency locking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201103467U CN201266923Y (en) | 2008-09-09 | 2008-09-09 | GPS combined time frequency instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201103467U CN201266923Y (en) | 2008-09-09 | 2008-09-09 | GPS combined time frequency instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201266923Y true CN201266923Y (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201103467U Expired - Fee Related CN201266923Y (en) | 2008-09-09 | 2008-09-09 | GPS combined time frequency instrument |
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|---|---|
| CN (1) | CN201266923Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118165A (en) * | 2009-12-01 | 2011-07-06 | 精工爱普生株式会社 | Atomic oscillator and manufacturing method |
| CN110176982A (en) * | 2019-04-19 | 2019-08-27 | 中国计量科学研究院 | Single channel temporal frequency high-precision transfer device |
| CN110198211A (en) * | 2019-04-19 | 2019-09-03 | 中国计量科学研究院 | Frequency time signal integration unit based on the fusion of multi-source frequency time signal |
-
2008
- 2008-09-09 CN CNU2008201103467U patent/CN201266923Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118165A (en) * | 2009-12-01 | 2011-07-06 | 精工爱普生株式会社 | Atomic oscillator and manufacturing method |
| CN102118165B (en) * | 2009-12-01 | 2013-11-27 | 精工爱普生株式会社 | Atomic oscillator and manufacturing method |
| CN110176982A (en) * | 2019-04-19 | 2019-08-27 | 中国计量科学研究院 | Single channel temporal frequency high-precision transfer device |
| CN110198211A (en) * | 2019-04-19 | 2019-09-03 | 中国计量科学研究院 | Frequency time signal integration unit based on the fusion of multi-source frequency time signal |
| CN110198211B (en) * | 2019-04-19 | 2021-12-03 | 中国计量科学研究院 | Time frequency signal synthesis device based on multi-source time frequency signal fusion |
| CN110176982B (en) * | 2019-04-19 | 2021-12-03 | 中国计量科学研究院 | Single-channel time frequency high-precision transmission device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING SDI SCIENCE + TECHNOLOGY CO., LTD. Free format text: FORMER NAME: BEIJING SDI TECH. DEVELOPMENT CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 100080 Beijing City, Haidian District Zhongguancun street, No. 19 gate building block B room 910 Patentee after: Beijing SDi Science & Technology Co., Ltd. Address before: 100080 Beijing City, Haidian District Zhongguancun street, No. 19 gate building block B room 910 Patentee before: Beijing SDi Tech. Development Co., Ltd. |
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| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 100094, No. 11 East Feng Chi Road, northwest town, Beijing, Haidian District Patentee after: Beijing SDi Science & Technology Co., Ltd. Address before: 100080 Beijing City, Haidian District Zhongguancun street, No. 19 gate building block B room 910 Patentee before: Beijing SDi Science & Technology Co., Ltd. |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing SDi Science & Technology Co., Ltd. Document name: Notification of Termination of Patent Right |
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| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090701 Termination date: 20170909 |
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| CF01 | Termination of patent right due to non-payment of annual fee |