CN102759883A - Pulsar time synchronizing device and method based on DDS (Direct Digital Synthesizer) - Google Patents
Pulsar time synchronizing device and method based on DDS (Direct Digital Synthesizer) Download PDFInfo
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- CN102759883A CN102759883A CN2012102430683A CN201210243068A CN102759883A CN 102759883 A CN102759883 A CN 102759883A CN 2012102430683 A CN2012102430683 A CN 2012102430683A CN 201210243068 A CN201210243068 A CN 201210243068A CN 102759883 A CN102759883 A CN 102759883A
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Abstract
The invention discloses a pulsar time synchronizing device and method based on a DDS (Direct Digital Synthesizer). The device comprises an X ray detector, a signal conditioner, a rubidium atomic clock, a DDS module, a frequency divider, a time interval measuring module and a CPU (Central Processing Unit), wherein an output end of the X ray detector is connected with an input end of the signal conditioner; an output end of the signal conditioner is connected to the time interval measuring module; a frequency signal output end of the rubidium atomic clock is connected with an input end of the DDS module; an output end of the DDS module is connected with an input end of the frequency divider; an output end of the frequency divider is connected to the time interval measuring module; and an output end of the time interval measuring module is connected to the CPU and the CPU is further connected with the DDS module. The device has the advantages of simple structure, low cost and strong realizability.
Description
Technical field
The invention belongs to the Time synchronization technique field, relate to a kind of time synchronism apparatus and method, especially a kind of pulsar time synchronism apparatus and method based on direct digital frequency synthesis technology (DDS).
Background technology
Pulsar is the neutron star of high speed rotation, and its rotation period is stable, not destroyed by artificial interference, is natural time reference source.Pulsar is good apart from the remote observability of the solar system, and wide coverage is all used for various LEOs, middle high orbit and survey of deep space track.
The independent navigation satellite is in the process of executing the task; Satellite atomic clock can produce frequency drift in time; And high precision time and frequency signal are the prerequisites that realizes high precision orbit determination, so high precision time synchronization device having a very important role for the independent navigation satellite.
At present; Time synchronization technique based on the X ray pulsar still is in the starting stage; Domestic still do not have a proven technique scheme; The present invention is directed to this problem and designed a kind of time synchronism apparatus based on pulsar, its effect is to utilize cyclic pulse signal that spaceborne X-ray detector detects to revising in the spaceborne rubidium atom, makes satellite atomic clock keep higher accuracy.
Compare with the structure of existing time synchronism apparatus; Increased DDS (the frequency Direct Digital is synthetic) module in the time synchronized of the present invention loop; Because the existing spaceborne rubidium atomic clock of China does not have the interface of frequency modulation, so must realize regulatory function through outside DDS module to frequency.
Summary of the invention
The present invention has designed a kind of pulsar time synchronism apparatus based on DDS.Because the existing spaceborne rubidium clock of China does not still have the frequency modulation interface, has more realizability so the present invention compares existing technical scheme.The present invention is the object of the invention of realizing through following technical scheme:
Based on the pulsar time synchronism apparatus of DDS, comprise X-ray detector, signal conditioner, rubidium atomic clock, DDS module, frequency divider, time interval measurement module and CPU; The output terminal of said X-ray detector connects the input end of signal conditioner, and the output terminal of said signal conditioner is connected to the time interval measurement module; The frequency signal output terminal of said rubidium atomic clock is connected to the input end of DDS module, and the output terminal of described DDS module is connected to the input end of frequency divider, and the output terminal of said frequency divider is connected to the time interval measurement module; The output terminal of said time interval measurement module is connected to CPU; Said CPU output terminal also is connected to the DDS module.
Above-mentioned CPU is connected with the DDS module through SPI interface (being not limited to the SPI interface).
The present invention also proposes a kind of method for synchronizing time of said apparatus; Be specially: the signal that X-ray detector detecting x-ray pulsar emits; This signal is exported to signal conditioner production burst signal, whenever detect an x-ray photon and will generate a pulse signal; Rubidium atomic clock sends a frequency signal f to the DDS module, has become f ' through frequency after the DDS module; Frequency divider receives the frequency signal of f ', and signal frequency split is formed the divided pulse signal; The time interval measurement module records and measure pulse signal and the divided pulse signal of rubidium atomic clock between mistiming, and then can access the time that pulsed light arrives X-ray detector; CPU reads the time of the arrival detector of pulse photon from the time interval measurement module; And postpone to revise; Profile generation, the filtering of clock correction and the calculating of rubidium atomic clock frequency correction, the correction to rubidium atomic clock that will obtain is at last revised the DDS module through interface.
The present invention has following beneficial effect:
The present invention is based on pulsar time synchronism apparatus and the method for DDS, a kind of effective means are provided for the independent navigation satellite keeps high precision time and frequency standard.It has, and apparatus structure is simple, and cost is low, the advantage that realizability is strong.
Description of drawings
Fig. 1 is a simultaneous techniques schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, the present invention is based on the pulsar time synchronism apparatus of DDS, comprise X-ray detector 1, signal conditioner 2, rubidium atomic clock 3, DDS module 4, frequency divider 5, time interval measurement module 6 and CPU7; The output terminal of X-ray detector 1 connects the input end of signal conditioner 2, and the output terminal of signal conditioner 2 is connected to time interval measurement module 6; The frequency signal output terminal of rubidium atomic clock 3 is connected to the input end of DDS module 4, and the output terminal of DDS module 4 is connected to the input end of frequency divider 5, and the output terminal of frequency divider 5 is connected to time interval measurement module 6; The output terminal of time interval measurement module 6 is connected to CPU7; CPU7 also is connected to DDS module 4.
More than the method for synchronizing time of device is specially:
The signal that X-ray detector 1 detecting x-ray pulsar emits is exported to signal conditioner 2 production burst signals with this signal, whenever detects an x-ray photon and will generate a pulse signal; A frequency signal f is to DDS module 4 in rubidium atomic clock 3 outputs, through DDS module 4 back synthesized frequency signal f '; Frequency divider 5 receiving frequency signals f ', and signal frequency split formed the divided pulse signal; Time interval measurement module 6 is measured the mistiming between pulse signals and the rubidium atomic clock 3 divided pulse signal after via DDS module 4; CPU7 reads the time of the arrival detector of pulse photon from time interval measurement module 6, and postpones to revise, and pulse profile extracts; The impulse phase zero-point positioning; And calculate and measure pulse due in and forecast pulse mistiming constantly, the sequence of at last this time difference being formed is done filtering operation, obtains the estimated value of clock correction; Calculate correction at last, and this controlled quentity controlled variable is sent to DDS module 4 carry out the frequency of amendment signal frequency.
Claims (2)
1. the pulsar time synchronism apparatus based on DDS is characterized in that, comprises X-ray detector (1), signal conditioner (2), rubidium atomic clock (3), DDS module (4), frequency divider (5), time interval measurement module (6) and CPU (7); The output terminal of said X-ray detector (1) connects the input end of signal conditioner (2), and the output terminal of said signal conditioner (2) is connected to time interval measurement module (6); The frequency signal output terminal of said rubidium atomic clock (3) is connected to the input end of DDS module (4), and the output terminal of DDS module (4) is connected to the input end of frequency divider (5), and the output terminal of said frequency divider (5) is connected to time interval measurement module (6); The output terminal of said time interval measurement module (6) is connected to CPU (7); Said CPU (7) also is connected to DDS module (4).
2. the method for synchronizing time of the said device of claim 1; It is characterized in that; The signal that X-ray detector (1) detecting x-ray pulsar emits; This signal is exported to signal conditioner (2) production burst signal, whenever detect an x-ray photon and will generate a pulse signal; A frequency signal f is to DDS module (4) in rubidium atomic clock (3) output, through becoming f ' after DDS module (4) frequency synthesis; Frequency divider (5) receiving frequency signals f ', and signal frequency split formed the divided pulse signal; Mistiming between the divided pulse signal of time interval measurement module (6) measurement pulse signal and rubidium atomic clock (3); CPU (7) reads the time of the arrival detector of pulse photon from time interval measurement module (6), and postpones to revise, and pulse profile generates; The phase zero point location; Filtering and control computing obtain the correction to the DDS module, and through interface DDS module (4) are revised.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102997922A (en) * | 2012-11-30 | 2013-03-27 | 北京控制工程研究所 | Method for determining pulse arrival time difference by utilizing optical navigation information |
| CN103383539A (en) * | 2013-06-28 | 2013-11-06 | 中国航天科技集团公司第五研究院第五一三研究所 | Time measuring method based on double-clock system |
| CN105588570A (en) * | 2015-12-16 | 2016-05-18 | 中国空间技术研究院 | Large-capacity wireless data transmission and collection system with timestamp |
| CN113341679A (en) * | 2021-06-15 | 2021-09-03 | 郑州轻大产业技术研究院有限公司 | High-precision signal frequency control method and system based on Beidou space rubidium atomic clock |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997922A (en) * | 2012-11-30 | 2013-03-27 | 北京控制工程研究所 | Method for determining pulse arrival time difference by utilizing optical navigation information |
| CN102997922B (en) * | 2012-11-30 | 2015-10-21 | 北京控制工程研究所 | A kind of pulse arrival time difference defining method utilizing optical navigation information |
| CN103383539A (en) * | 2013-06-28 | 2013-11-06 | 中国航天科技集团公司第五研究院第五一三研究所 | Time measuring method based on double-clock system |
| CN103383539B (en) * | 2013-06-28 | 2016-08-17 | 中国航天科技集团公司第五研究院第五一三研究所 | A kind of Method Of Time Measurement based on doubleclocking system |
| CN105588570A (en) * | 2015-12-16 | 2016-05-18 | 中国空间技术研究院 | Large-capacity wireless data transmission and collection system with timestamp |
| CN105588570B (en) * | 2015-12-16 | 2019-03-26 | 中国空间技术研究院 | A kind of large capacity and the wireless data transmission acquisition system with time stamp |
| CN113341679A (en) * | 2021-06-15 | 2021-09-03 | 郑州轻大产业技术研究院有限公司 | High-precision signal frequency control method and system based on Beidou space rubidium atomic clock |
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