CN1845462A - Programmable time frequency pulse signal generator based on atomic frequency standard and GPS - Google Patents
Programmable time frequency pulse signal generator based on atomic frequency standard and GPS Download PDFInfo
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- CN1845462A CN1845462A CN 200610018625 CN200610018625A CN1845462A CN 1845462 A CN1845462 A CN 1845462A CN 200610018625 CN200610018625 CN 200610018625 CN 200610018625 A CN200610018625 A CN 200610018625A CN 1845462 A CN1845462 A CN 1845462A
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Abstract
The disclosed programmable time-frequency pulse signal generator based on atomic frequency scale and GPS comprises: a CPU 2 with PLL to generate required frequency and 1PPS pulse, the connected GPS 1 to correct the error of 4 and obtain stable frequency reference, RS232 communication interface 3, atomic frequency scale 4, trigger source input 5, frequency/pulse output 6, keyboard 7, and display system 8. This invention has wide application.
Description
Technical field
The present invention relates to a kind of temporal frequency pulse generator, specifically, relate to a kind of programmable time frequency pulse signal generator based on atomic frequency standard and GPS; Can be widely used in navigator fix, Aero-Space, radio communication, electric power transfer, fields such as Scientific Measurement and education experiment.
Background technology
Since the 17th century, astronomers with earth rotation and universal time as time scale; But, make people more and more higher to the accuracy requirement of time scale along with the progress of society and the develop rapidly of science and technology (particularly space flight, space physics, military affairs etc.).
Nineteen fifty-three, first atomic clock succeeded in developing by three scientists in Columbia Univ USA in the world; The appearance of atomic clock makes the clock accuracy reach 10
-13～10
-15Magnitude.Atomic frequency standard has good short-term stability, has important application on engineering.But owing to be subjected to the restriction of Physical Mechanism, the steady index of the length of atomic frequency standard is good inadequately, has limited its application at numerous areas.
Gps satellite signal is the sharable information source in a kind of crucial whole world; Temporal frequency system based on GPS has good long term stability, and accurate localization, timing and calibrating frequency can be provided.The gps time simultaneous techniques all has broad application prospects at the coordination of international temporal frequency, the foundation of novel time-frequency metering transmission system, digital communication system, electric power and electric power system, transportation system and many other fields.But because gps time information limits its application in short defective aspect steady.
Pulse signal generator develops comparative maturity as the equipment of test and electronic instruction indispensability, can realize the adjusting of frequency, pulsewidth.But in the application of some time experimental systems, often need external trigger to produce lock-out pulse output.
Summary of the invention
Purpose of the present invention just is to overcome the above-mentioned shortcoming and defect that prior art exists, and a kind of programmable time frequency pulse signal generator based on atomic frequency standard and GPS technology is provided.The present invention has overcome atomic frequency standard and GPS deficiency separately, has improved the index of the time stability of system, has satisfied the long and short steady excellent requirement of holding concurrently of frequency standard; Simultaneously, owing to added the external trigger input, solved the problem of system synchronization in using.
The object of the present invention is achieved like this: in atomic frequency standard, the frequency of a short-term stability is provided by quantized system itself, constantly revise by the gps signal of long-term stability again, obtain precise time frequency reference signal, even under the disengaging gps signal, still can keep a stable frequency output.
One, programmable time frequency pulse signal generator (abbreviation signal generator)
As shown in Figure 1, this signal generator is by GPS module 1, centralized control unit (CPU) 2, RS232 communication interface 3, atomic frequency standard 4, triggering source input 5, and frequency, pulse export 6, keyboard 7, and display system 8 is formed;
Annexation between each parts is:
Atomic frequency standard 4, GPS module 1 link to each other with CPU2 respectively, by the GPS module 1 continuous clock jitter of revising atomic frequency standard 4, obtain the frequency reference of system stability, produce the clock frequency and the 1PPS pulse of user's request again by the phase-locked loop (PLL) of CPU2;
Triggering source input 5 links to each other with CPU2, and the triggering for generating frequency signal is exported;
RS232 communication interface 3 links to each other with CPU2, tele-control system, the parameter of programmed settings frequency, pulse output 6, triggering source input 5, inquiry system; Obtain the state that GPS module 1 receives satellite;
Two, the GPS modification method of atomic frequency standard 4
The GPS of atomic frequency standard 4 revises principle as shown in Figure 2, and the following step is arranged:
1. gps antenna 9, GPS module 1, CPU2 connect successively, the temporal information and the 1PPS synchronizing signal that provide system to need;
2. atomic frequency standard 4 is a VCXO (OCXO) 13, and CPU2, digital to analog converter (DAC) 12, VCXO (OCXO) 13 connect successively; Because the field coil in atomic frequency standard 4 resonant cavitys is the frequency that is used for adjusting the atom hyperfine transition, so CPU2 comes controlling magnetic field by 12 DAC (12), revises atomic frequency standard 4 in real time;
3. the Rb clock frequency accuracy that obtains according to the method with the lowest mean square root determines whether to carry out the frequency adjustment;
4. be in course of adjustment and use less phase shift stepping amount, progressively adjust, otherwise cause hunting of frequency easily, influence short-term stability.
System's major function is as follows:
1, GPS module 1 possesses parallel 12 passages, has improved correction of system time frequency and positioning accuracy.
2, provide 4 road independent clock frequencies output 6, frequency 1MHz～100MHz programmable regulating, stability 2 * 10
-12
3, provide 3 road independent veins to dash output 6, multiple programming mode, programming pulse width: 5ns～100ms, resolution 1ns.
4,1PPS pulse output 14, time precision 25ns, and pulse duration is able to programme.
5, provide 2 tunnel independence pulse triggering sources input 5, trigger impulse is exported 6 signals.Optional continuous trigger and two kinds of patterns of external trigger are exported in pulse.
6, display system 8 adopts the VFD display module, and luminous automatically, high definition and high brightness make it have better display effect, and wide visual angle reaction speed is fast, and English, Chinese, graphical display are provided.
7, display system 8, keyboard 7 cooperate and can inquire about, and revise system mode, the programmed settings system parameters.
8, RS232 communication interface 3 general DB9 interfaces can be inquired about, and revise system mode, the programmed settings system parameters.
9, front panel provides 3 highlighted LED, display power supply, and the gps satellite state, 1PPS shows.
The present invention compared with prior art has the following advantages:
1, in atomic frequency standard, by the correction of GPS module, the long and short steady excellent purpose of holding concurrently of the system that realized.
2, have in light weight and volume, advantage that power consumption is little.
3, exclusive servo-control system shortens the system stability time.
4, have multichannel programmable pulse output, and independently external trigger input is provided.
5, multiuser interface, RS232 communication interface 3, keyboard 7 are set programming, and the wide visual angle of high brightness display are provided.
6, can be widely used in navigator fix, Aero-Space, radio communication, electric power transfer, fields such as Scientific Measurement and education experiment.
Description of drawings
Fig. 1 is a composition frame chart of the present invention;
Fig. 2 is a temporal frequency servo system block diagram;
Fig. 3 is VCXO (OCXO) schematic diagram.
Wherein:
The 1-GPS module; 2-centralized control unit (CPU);
The 3-RS232 communication interface; The 4-atomic frequency standard;
5-triggers input port; 6-frequency, pulse output;
The 7-keyboard; The 8-display system;
The 9-GPS antenna; The 10-phase comparison unit;
The 11-phase adjustment unit; 12-digital to analog converter (DAC);
13-VCXO (OCXO); 14-1PPS pulse output.
Embodiment
1, about signal generator
* VCXO (OCXO) unit 13 is selected the PRS10M of SRS company for use.
* GPS module 1 is selected the M12+ of motorola inc for use.
* centralized control unit (CPU) 2 is selected the embedded Nios processor of FPGA for use.
2, about the GPS modification method of atomic frequency standard 4
* phase adjustment unit 11 utilizes the inner phase-locked loop of Field Programmable Gate Array (FPGA) to realize.
* the high-speed digital logic circuit centralized control unit is in the inner realization of FPGA.
* counting unit is in the inner realization of FPGA.
* FPGA selects the Cyclone EP1C12Q240C8 of altera corp for use.
* continuous trigger and outside multichannel independent triggers pattern are adopted in pulse output.
* have the frequency signal output of multichannel programmable, these signals are by the phase-locked derivation of atomic frequency standard signal.
Claims (9)
1, a kind of programmable time frequency pulse signal generator based on atomic frequency standard and GPS is characterized in that:
Form with the GPS module (1) that is connected with CPU (2) respectively, RS232 communication interface (3), atomic frequency standard (4), the input of triggering source (5), frequency, pulse output (6), keyboard (7), display system (8) by centralized control unit CPU (2);
Constantly revise the clock jitter of atomic frequency standard (4) by GPS module (1), obtain the frequency reference of system stability, produce the clock frequency and the 1PPS pulse of user's request again by the phase-locked loop pll of CPU (2).
2, by the described programmable time frequency pulse of claim 1 signal generator, it is characterized in that:
Atomic frequency standard (4) is VCXO OCXO (13), selects the PRS10M of SRS company for use.
3, by the described programmable time frequency pulse of claim 1 signal generator, it is characterized in that:
GPS module (1) is selected the M12+ of motorola inc for use.
4, by the described programmable time frequency pulse of claim 1 signal generator, it is characterized in that:
CPU (2) selects the embedded Nios processor of FPGA for use.
5, the GPS modification method of a kind of atomic frequency standard (4) is characterized in that:
1. gps antenna (9), GPS module (1), CPU (2) connect successively, the temporal information and the 1PPS synchronizing signal that provide system to need;
2. atomic frequency standard (4) is VCXO OCXO (13), and CPU (2), digital to analog converter DAC (12), OCXO (13) connect successively; CPU (2) comes controlling magnetic field by 12 DAC (12), revises atomic frequency standard (4) in real time;
3. the Rb clock frequency accuracy that obtains according to the method with the lowest mean square root determines whether to carry out the frequency adjustment;
4. be in course of adjustment and use less phase shift stepping amount, progressively adjust.
6, by the GPS modification method of the described a kind of atomic frequency standard of claim 5 (4), it is characterized in that:
Phase adjustment unit (11) utilizes the inner phase-locked loop of Field Programmable Gate Array FPGA to realize.
7, by the GPS modification method of the described a kind of atomic frequency standard of claim 5 (4), it is characterized in that:
The high-speed digital logic circuit centralized control unit is in the inner realization of FPGA.
8, by the GPS modification method of the described a kind of atomic frequency standard of claim 5 (4), it is characterized in that: counting unit is in the inner realization of FPGA.
9, by the GPS modification method of the described a kind of atomic frequency standard of claim 5 (4), it is characterized in that: FPGA selects the Cyclone EP1C12Q240C8 of altera corp for use.
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|---|---|---|---|
| CN 200610018625 CN1845462A (en) | 2006-03-24 | 2006-03-24 | Programmable time frequency pulse signal generator based on atomic frequency standard and GPS |
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|---|---|---|---|
| CN 200610018625 CN1845462A (en) | 2006-03-24 | 2006-03-24 | Programmable time frequency pulse signal generator based on atomic frequency standard and GPS |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035549A (en) * | 2010-11-30 | 2011-04-27 | 江汉大学 | Synchronous phase discriminating device and method of rubidium atomic frequency standard |
| CN104393412A (en) * | 2014-12-05 | 2015-03-04 | 成都国卫通信技术有限公司 | Antenna control device and method |
| CN105610440A (en) * | 2015-12-17 | 2016-05-25 | 北京无线电计量测试研究所 | Method and device for adjusting CPT atomic frequency standard |
| CN105049040B (en) * | 2015-06-24 | 2017-12-15 | 中国科学院武汉物理与数学研究所 | A kind of method that Atomic Clocks Based on Coherent Population Trapping output frequency is corrected using GNSS |
| CN110989327A (en) * | 2019-12-26 | 2020-04-10 | 中国计量科学研究院 | Distributed high-precision time frequency real-time integrated system |
-
2006
- 2006-03-24 CN CN 200610018625 patent/CN1845462A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035549A (en) * | 2010-11-30 | 2011-04-27 | 江汉大学 | Synchronous phase discriminating device and method of rubidium atomic frequency standard |
| CN104393412A (en) * | 2014-12-05 | 2015-03-04 | 成都国卫通信技术有限公司 | Antenna control device and method |
| CN105049040B (en) * | 2015-06-24 | 2017-12-15 | 中国科学院武汉物理与数学研究所 | A kind of method that Atomic Clocks Based on Coherent Population Trapping output frequency is corrected using GNSS |
| CN105610440A (en) * | 2015-12-17 | 2016-05-25 | 北京无线电计量测试研究所 | Method and device for adjusting CPT atomic frequency standard |
| CN110989327A (en) * | 2019-12-26 | 2020-04-10 | 中国计量科学研究院 | Distributed high-precision time frequency real-time integrated system |
| CN110989327B (en) * | 2019-12-26 | 2021-03-30 | 中国计量科学研究院 | Distributed high-precision time frequency real-time integrated system |
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