CN102759882A - Time synchronizing device based on pulsar - Google Patents
Time synchronizing device based on pulsar Download PDFInfo
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- CN102759882A CN102759882A CN201210243058XA CN201210243058A CN102759882A CN 102759882 A CN102759882 A CN 102759882A CN 201210243058X A CN201210243058X A CN 201210243058XA CN 201210243058 A CN201210243058 A CN 201210243058A CN 102759882 A CN102759882 A CN 102759882A
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Abstract
The invention provides a time synchronizing device based on a pulsar, comprising an X ray detector, a signal conditioner, a rubidium atomic clock, 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 with an input end of the time interval measuring module; an output end of the rubidium atomic clock is connected with an input end of the frequency divider; and an output end of the frequency divider is connected with the other input end of the time interval measuring module. The time synchronizing device based on the pulsar disclosed by the invention has the advantages of simple structure, higher precision and low cost.
Description
Technical field
The invention belongs to the digital technology field, relate to a kind of Time synchronization technique, especially a kind of time synchronism apparatus based on pulsar.
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 periodic pulse signal that spaceborne X-ray detector detects to revising in the spaceborne rubidium atom, makes satellite atomic clock keep higher accuracy.
Summary of the invention
At present, still be in the starting stage based on X ray pulsar autonomous navigation technology, and still do not have the proven technique scheme, the present invention is directed to this problem and designed a kind of time synchronism apparatus based on pulsar based on the time synchronism apparatus of X ray pulsar.
This time synchronism apparatus has the precision height, and is simple in structure, the advantage that cost is low.
The objective of the invention is to realize through following technical scheme:
Time synchronism apparatus based on pulsar comprises X-ray detector, signal conditioner, rubidium atomic clock, frequency divider, time interval measurement module and CPU; The output terminal of said X-ray detector links to each other with the input end of signal conditioner, the T of the output terminal of signal conditioner and time interval measurement module
XInput end links to each other; The output terminal of said rubidium atomic clock links to each other with the input end of frequency divider, the T of the output terminal of said frequency divider and time interval measurement module
RInput end links to each other; Said time interval measurement module links to each other with the CPU input end through universal serial bus, and CPU is connected with rubidium atomic clock through communication interface.
Above-mentioned frequency divider 4 adopts on-site programmable gate array FPGA.
Above-mentioned universal serial bus adopts high-speed synchronous serial port SPI.
Above-mentioned communication interface adopts the RS232 interface.
The present invention has following beneficial effect:
The present invention is a kind of based on the pulsar time synchronism apparatus, for the independent navigation satellite keeps high precision time and frequency standard a kind of effective means is provided.It is simple that it has an apparatus structure, and precision is high, the advantage that cost is low.
Description of drawings
Fig. 1 is the time synchronism apparatus structural drawing that the present invention is based on pulsar.
Wherein: 1 is X-ray detector; 2 is signal conditioner; 3 is rubidium atomic clock; 4 is frequency divider; 5 are the time interval measurement module; 6 is CPU.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, this time synchronism apparatus based on pulsar comprises X-ray detector 1, signal conditioner 2, rubidium atomic clock 3, frequency divider 4, time interval measurement module 5 and CPU6; The output terminal of said X-ray detector 1 links to each other with the input end of signal conditioner 2, the T of the output terminal of signal conditioner 2 and time interval measurement module 5
XInput end links to each other; The output terminal of said rubidium atomic clock 3 links to each other with the input end of frequency divider 4, and the output terminal of said frequency divider 4 links to each other with the input end of time interval measurement module 5; Said time interval measurement module 5 links to each other with the input end of CPU6 through universal serial bus, and CPU6 is connected with rubidium atomic clock 3 through communication interface.Frequency divider 4 adopts on-site programmable gate array FPGA, and universal serial bus adopts high-speed synchronous serial port SPI, and communication interface adopts RS232 interface (but being not limited to the RS232 interface).
According to Fig. 1 the concrete course of work of the present invention is further described below:
The photon that X-ray detector 1 detecting x-ray pulsar emits whenever detects a photon and just sends a signal, and this signal is through signal conditioner 2 production burst signal T
X, signal conditioner 2 is with pulse signal T
XPass to time interval measurement module 5; Rubidium atomic clock 3 sends the signal of certain frequency and gives frequency divider 4, and the signal of 4 pairs of rubidium atomic clocks of frequency divider, 3 outputs carries out frequency division and obtains divided pulse T
R, frequency divider 4 is with divided pulse T
RAlso pass to time interval measurement module 5; Time interval measurement module 5 is measured pulse signal T
XWith divided pulse T
RBetween mistiming △ T, CPU6 is through the mistiming △ T in the high-speed synchronous serial port SPI time for reading interval measurement module 5, and then obtains the time T that the pulse photon arrives detector
Obs, computing machine combines the spacecraft kinematic parameter to T
ObsPostpone to revise, fold the mistiming of the pulse due in of the production burst star-wheel that adds up pulse due in wide, also calculating measurement and forecast by predetermined period; Reach the calculating to the rubidium atomic clock correction quantity of frequency through filtering, the correction to rubidium atomic clock 3 that will obtain at last feeds back to rubidium atomic clock 3 through the RS232 interface and revises.
Claims (6)
1. the time synchronism apparatus based on pulsar is characterized in that: comprise X-ray detector (1), signal conditioner (2), rubidium atomic clock (3), frequency divider (4), time interval measurement module (5) and CPU (6); The output terminal of said X-ray detector (1) links to each other with the input end of signal conditioner (2), and the output terminal of signal conditioner (2) links to each other with an input end of time interval measurement module (5); The output terminal of said rubidium atomic clock (3) links to each other with the input end of frequency divider (4), and the output terminal of said frequency divider (4) links to each other with the another one input end of time interval measurement module (5); Said time interval measurement module (5) links to each other with the input end of CPU (6) through universal serial bus.
2. a kind of time synchronism apparatus according to claim 1 based on pulsar; It is characterized in that: X-ray detector whenever receives an x-ray photon; Just export a signal, this signal becomes a pulse signal that can be used in time interval measurement behind signal conditioner.
3. a kind of time synchronism apparatus based on pulsar according to claim 1 is characterized in that: the time interval measurement module can be measured in a period of time, the number of the x-ray photon that X-ray detector detected with and moment of reaching.
4. according to the described a kind of time synchronism apparatus of claim 1, it is characterized in that CPU can revise the frequency of rubidium atomic clock through the RS232 interface based on pulsar.
5. a kind of time synchronism apparatus based on pulsar according to claim 1 is characterized in that: said frequency divider (4) adopts on-site programmable gate array FPGA.
6. according to the described a kind of time synchronism apparatus based on pulsar of claim 1, it is characterized in that: said universal serial bus adopts high-speed synchronous serial port SPI.
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| CN201210243058XA CN102759882A (en) | 2012-07-13 | 2012-07-13 | Time synchronizing device based on pulsar |
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| CN201210243058XA CN102759882A (en) | 2012-07-13 | 2012-07-13 | Time synchronizing device based on pulsar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393975A (en) * | 2014-11-06 | 2015-03-04 | 西安交通大学 | A time synchronizing system and method based on dual mode time service of Loongson 1D |
| CN111605734A (en) * | 2020-04-28 | 2020-09-01 | 北京控制工程研究所 | Filtering timing system and method for accurate synchronization of spacecraft three-super control satellite time |
| CN113219815A (en) * | 2021-05-06 | 2021-08-06 | 中国科学院国家授时中心 | Deep space time service method based on X-ray pulsar |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393975A (en) * | 2014-11-06 | 2015-03-04 | 西安交通大学 | A time synchronizing system and method based on dual mode time service of Loongson 1D |
| CN104393975B (en) * | 2014-11-06 | 2017-08-25 | 西安交通大学 | The clock synchronization system and method for a kind of bimodulus time service based on Godson 1D |
| CN111605734A (en) * | 2020-04-28 | 2020-09-01 | 北京控制工程研究所 | Filtering timing system and method for accurate synchronization of spacecraft three-super control satellite time |
| CN111605734B (en) * | 2020-04-28 | 2021-11-16 | 北京控制工程研究所 | Filtering timing system and method for accurate synchronization of spacecraft three-super control satellite time |
| CN113219815A (en) * | 2021-05-06 | 2021-08-06 | 中国科学院国家授时中心 | Deep space time service method based on X-ray pulsar |
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Application publication date: 20121031 |