CN110780583B - Moon-based pulsar time reference generation system - Google Patents
Moon-based pulsar time reference generation system Download PDFInfo
- Publication number
- CN110780583B CN110780583B CN201911036131.4A CN201911036131A CN110780583B CN 110780583 B CN110780583 B CN 110780583B CN 201911036131 A CN201911036131 A CN 201911036131A CN 110780583 B CN110780583 B CN 110780583B
- Authority
- CN
- China
- Prior art keywords
- time
- pulsar
- photon
- ray
- atomic clock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Electric Clocks (AREA)
Abstract
The invention discloses a generation system of a lunar-based pulsar time reference, which is arranged on the surface of a moon, and comprises: the system comprises a lunar-base X-ray pulsar observation device, an atomic clock group and a time data fusion device; the lunar-based X-ray pulsar observation equipment is used for acquiring and recording the pulse arrival time of an X-ray pulsar and converting the pulse arrival time into pulsar time; the atomic clock group is used for providing atomic clock time; the time data fusion device is used for combining pulsar time and atomic clock time to generate a month-based pulsar time reference. The month-based pulsar time reference generation system greatly reduces the complexity of X-ray pulsar signal receiving equipment and improves the working performance; the pulsar time and the atomic clock are combined, so that the advantages of the two time systems are complementary, the advantages are obtained, the shortages are compensated, the advantages of good pulsar time period stability and good atomic clock time short-term stability are fully exerted, and the defects of the pulsar time period and the atomic clock time are overcome.
Description
Technical Field
The invention relates to the field of astronomical measurement and navigation, in particular to a lunar-based pulsar time reference generation system.
Background
The time reference system is an important technical support of the country and can be widely applied to military and civil fields such as space exploration, deep space navigation and accurate time service. With the development of natural science disciplines such as astronomy, physics and the like, higher and higher requirements are put forward on the stability of a time reference system and the anti-interference performance of the system. The existing time reference system is constructed by taking a high-precision atomic clock as a core, and the system has the problems of poor long-term stability, easy interference and high maintenance cost, so that research on a novel time reference technology is urgently needed.
Pulsar (Pulsar), also known as a blinking moment, is one of the neutron stars, a star body that periodically emits a pulse signal, and has a diameter of about 10 km or so, and its rotation is extremely fast. The pulsar is found for the first time by Jocelyn Bell, a doctor of Cambridge university in 7 months of 1967, so that the view of the human on the universe is changed, and a new time concept, namely the pulsar, is brought to the human.
The millisecond pulsar is relatively old in age, with a typical age of 109In the year, the radiation flow is weak, but the inherent internal disturbance is very small, the rotation is very stable, the pulse profile is very steep and regular, and the basic characteristics are as follows:
1. the autorotation period of the millisecond pulsar has good stability;
2. the millisecond pulsar can continuously and naturally radiate signals for a long time, and stable pulse signals can be obtained by processing observation data at any time and place of a solar system;
3. the impulse TOA and the impulse time of the millisecond pulsar can be expressed by an accurate mathematical model, and have mathematical description characteristics of general disciplines;
4. the auxiliary device can be used to provide counting and display characteristics for the millisecond pulsar time.
It can be seen that the millisecond pulsar completely meets the basic conditions for establishing a time system, and is an ideal time measurement and frequency standard source. The research thereof has been carried out in related scientific research institutions. Since 1984, pulsar timing systems were established in successive countries of the united states, the united kingdom, australia, india, etc., and in particular, the pulsar research group at the university of princeton of the united states, observed two millisecond pulsars PSR B1937+21 and PSR B1855+09 for more than 10 years using the radio telescope of the arecobo astronomical stage, accumulated a great deal of observation data. In 2018, the ESA has started running a pulsar-based clock system, "PulChron" system at the technical center of the netherlands, which uses a plurality of pulsar radio timing arrays in europe to perform high-precision observation on space millisecond pulsar for high-precision correction of clock error of atomic clocks and finding potential evidence of existence of gravitational waves. Although China starts late, the establishment of the first large single-Aperture radio Telescope FAST (Five-rounded-meter Aperture radio Telescope) in the world provides a very effective platform for China to overtake the above countries in the field of pulsar timing.
The implementation mode of the existing pulsar time system at home and abroad at present is considered and mainly divided into two main types, wherein the first type is that on the ground, a large-caliber radio telescope is utilized to receive pulsar radiation signals of radio wave bands, and pulsars are obtained through a certain algorithm and then utilized; the second type is that equipment for detecting pulsar radiation signals is carried on a satellite, the pulsar radiation signals of X wave bands are received, and pulsar time is obtained through a certain algorithm.
The two main types of implementation methods have respective limitations: a large-caliber radio telescope is needed for receiving the pulsar signal on the ground, so that the equipment is huge; when the satellite receives the pulsar signals, the requirements on the size, the weight, the power consumption and the like of pulsar signal monitoring equipment are strict, and in addition, the stability of the satellite, the attitude of the satellite and the surrounding atmosphere have great influence on the pulsar received signals, so that the stable and accurate pulsar time is not favorably obtained.
Disclosure of Invention
The invention aims to solve the problem that a stable and uniform time reference is lacked in the earth-moon space at present, so that a month-based pulsar time reference generation system is provided, and a time reference is provided for the exploration activities of human beings in the earth-moon space at present and in the future.
In order to achieve the above object, the present invention provides a system for generating a reference time of a lunar-based pulsar placed on a lunar surface, the system comprising: the system comprises a lunar-base X-ray pulsar observation device, an atomic clock group and a time data fusion device; wherein the content of the first and second substances,
the lunar-based X-ray pulsar observation equipment is used for acquiring and recording the pulse arrival time of the X-ray pulsar and converting the pulse arrival time into pulsar time; the atomic clock group is used for providing atomic clock time; the time data fusion device is used for combining pulsar time and atomic clock time to generate a month-based pulsar time reference.
In the above technical solution, the lunar-based X-ray pulsar observation apparatus includes: the system comprises an X-ray photon probe, a photon information acquisition subsystem, an energy subsystem, a TOA data processing subsystem and a pulse star-time conversion module; wherein the content of the first and second substances,
the X-ray photon probe is used for focusing and collecting pulsar weak photon signals, and then performing photoelectric conversion, signal extraction and filter forming on the collected weak photon signals to obtain two photon signals;
the photon information acquisition subsystem carries out time marking processing on one path of photon signals, carries out digital acquisition, discriminates and judges the other path of photon signals through time marks, and acquires photon energy information; generating a time sequence of X-ray photon arrival from the photon energy information and the time-stamped photon signals;
the TOA data processing subsystem is used for preprocessing the X-ray photon arrival time sequence, performing large-scale space-time conversion, folding the contour and comparing the contour with a standard contour, and outputting the pulse arrival time TOA;
the pulse satellite-time conversion module is used for converting pulse arrival time into pulse satellite time;
the energy subsystem is used for supplying power to the whole month-based X-ray pulsar observation equipment.
In the above technical solution, the preprocessing of the X-ray photon arrival time sequence includes: and carrying out data decoding on the input X-ray photon arrival time sequence, counting the number of photons in each time period, removing the data in a certain time period if the number of photons in the certain time period is increased sharply, and taking the screened data as a final photon sequence.
In the above technical solution, the large-scale space-time transformation includes: and calling a solar system ephemeris and a pulsar database, and performing time transformation including Roemer delay and Shapiro delay on the X-ray photon arrival time sequence, so that the X-ray photon arrival time is converted into a mass center coordinate under the solar system mass center coordinate from the time recorded by an atomic clock under a detector body coordinate system.
In the above technical solution, the contour folding and comparing with the standard contour comprises: aligning and arranging all photons according to the arrival time of a single photon, obtaining a pulse profile through epoch folding, and comparing the pulse profile obtained through folding with a standard pulse profile by adopting a cross-correlation method to obtain the TOA.
In the above technical solution, converting the pulse arrival time into the pulsar time includes: and performing reference frame transformation on the obtained pulse arrival time TOA, converting the pulse arrival time TOA into a pulse arrival time TOA in a solar system centroid coordinate system, comparing the pulse arrival time TOA with a timing model obtained by an ephemeris to obtain a timing residual error, feeding back and calibrating the timing model on one hand, and calibrating error items including frequency drift and scale difference in the pulsar time model on the other hand, and updating the error items of the pulsar time by combining the daily calibration of the atomic clock frequency to finally obtain the pulsar time.
In the above technical solution, the time data fusion device combining pulsar time and atomic clock time includes: firstly, receiving a plurality of pulsar time data and a plurality of atomic clock time data, respectively carrying out sampling noise preprocessing and filtering on the data, and then carrying out sampling rate homogenization on the pulsar time data; then, converting the two time scales to the same reference scale; then, the jump value and the abnormal value in the pulsar time data and the atomic clock time data are processed, and once the jump value or the abnormal value is found, the input of the moment is replaced by the predicted value of the previous moment; then, calculating the Allen variances of different sources, defining the weights of the different sources according to the variances, and smoothing a weight equation, so that the long-term clock error of the atomic clock is corrected by using pulsar hours; then, performing Kalman filtering by taking phase, frequency and frequency drift as state vectors to obtain a combined time scale; after each filtering, carrying out calibration feedback on the difference between the combination time and the pulsar time; and finally, removing constant frequency drift, and outputting combined time, namely the lunar-base pulsar time reference.
The invention has the advantages that: on one hand, the pulsar signal detection equipment is established on the surface of the moon, so that a working platform of the X-ray pulsar signal receiving equipment becomes very stable, the requirements on the size, the power consumption and the like of the equipment are not limited, the complexity of the X-ray pulsar signal receiving equipment is greatly reduced, and the working performance is improved; on the other hand, the pulsar time and the atomic clock time are combined, so that the advantages of the two time systems are complementary, the advantages of the two time systems are made up for the deficiencies, the advantages of good pulsar time period stability and good atomic clock time short-term stability are fully exerted, and the defects of the pulsar time period stability and the atomic clock time short-term stability are overcome.
Drawings
FIG. 1 is a schematic diagram of the pulsar time keeping principle;
FIG. 2 is a schematic diagram of the construction of the month-based pulsar time reference generation system of the present invention;
FIG. 3 is a schematic structural diagram of a month-based X-ray pulsar observation device in the month-based pulsar time reference generation system of the present invention;
FIG. 4 is a data processing flow diagram of the TOA data processing subsystem in the month-based pulsar time reference generation system of the present invention;
fig. 5 is a flowchart of the operation of the time data fusion device in the month-based pulsar time reference generation system of the present invention.
Detailed Description
The basic principle of establishing a pulsar time reference based on an X-ray millisecond pulsar is shown in fig. 1. Wherein SSB represents the solar system centroid, n represents the pulsar direction vector, and r represents the position vector of the lunar observation base station relative to SSB.
The time of the pulse signal reaching the lunar station measured by the X-ray pulsar detection equipment is
The monthly base station position measurement is
Extrapolating the time of the pulse signal reaching the lunar base station to the time of the pulse signal reaching the solar system centroid SSB through a time conversion model
The formula (2) is shown in formula (1). Wherein musIs the gravitational constant of the sun, b is the position vector of the SSB relative to the center of mass of the sun, D0The distance between the pulsar and the sun, and the speed of light c.
The time t of the pulse signal reaching the solar system centroid SSB can be accurately predicted according to the pulsar timing modelSSB，tSSBThe real position of the lunar base station can be reached by using the pulse
And real time
And (3) expanding according to the form of formula (1), wherein delta t is an atomic clock difference, and delta r is the monthly base station position precision.
Subtracting the formula (1) from the formula (2) can obtain a measurement equation based on the pulsar corrected atomic clock difference as follows:
wherein, δ t1And δ t2Is the difference between the third term and the fourth term of equations (1) and (2), and the value is less than 1ns and can be ignored. Referring to the technical result of LLR (Lunar Laser Ranging), δ r is the position measurement precision of the Lunar base station, the precision is better than 50cm, and the corresponding time difference is less than 1.7 ns. Therefore, the high-precision measurement of the atomic clock difference can be realized by the formula (3).
The high sensitivity X-ray millisecond pulsar timing detector passes through the spatial high-quality millisecond pulsar (10)-4ph/cm2/s～10-5ph/cm2In/s magnitude) to output high-precision TOA information for correcting clock error of atomic clock. Thus, the two most important indicators for this system are the sensitivity of detection, e.g., TOA accuracy, and TOA accuracyFormula (4).
From equation (4), the sensitivity of an X-ray detector depends on the statistical index nσEffective area of system AeffArea A of X-ray sensor, observation time Deltat, and detection efficiency f of detectordSpatial background photon radiation flux B (E), detection energy spectrum range delta E and other factors.
In one embodiment, the desirable detection spectrum range Δ E is 10keV, nσThe sensor area A is 30mm2Background noise of 1 × 10-3ph/s/cm2. At 1m2Under the effective area of the detector, the sensitivity of the detector is 1 multiplied by 10 within the detection time of 1000s-7ph/s/cm2The method can meet the detection requirement of the millisecond pulsar with weak flow and high stability.
The TOA acquisition precision of the high-sensitivity X-ray millisecond pulsar timing detector is shown as the formula (5):
wherein the content of the first and second substances,
and
is a pulsar shape factor, P is the pulse period, t is the observation time, A is the effective area of the system, s is the target signal flow intensity, and b is the background flow intensity. In one embodiment, three millisecond pulsar symbols B1937+21, J0437-4715, and B1821-24 may be selected as representative, with the specific parameters shown in the following table.
TABLE 1 pulsar parameter table
Analyzing the relation between the TOA precision and the effective area time product of the detector according to the parameters, wherein under the same TOA precision requirement, the requirement of the pulsar with weak flow on the effective area time product of the detector system is higher for different pulsars; for the same pulsar, as the TOA accuracy increases, the requirement for the effective area of the detector system increases. For the B1937+21 pulsar, under the observation time of 10 days, when the TOA precision is 100ns, the requirement of the effective area of the detector is 1.06m2Meanwhile, the effective area of the detector can meet the sensitivity requirement.
Referring to fig. 2, the month-based pulsar time reference generating system of the present invention includes: the system comprises a lunar-base X-ray pulsar observation device, an atomic clock group and a time data fusion device; the lunar-based X-ray pulsar observation equipment is used for collecting and recording the pulse arrival time of an X-ray pulsar, the atomic clock group is used for providing atomic clock time, the time data fusion equipment is used for combining the pulse arrival time and the atomic clock time, the long-term clock difference of the atomic clock is corrected by utilizing high-precision pulsar time, and finally, the comprehensive time reference with high precision and high stability is obtained. The comprehensive time reference generated by the month-based pulsar time reference generation system can be distributed to the earth and month space users, and high-precision time-space reference is provided for human manned lunar landing, earth and month space activities and deep space detection tasks.
The various parts of the system are described further below.
Referring to fig. 3, the lunar-based X-ray pulsar observation apparatus includes: the system comprises an X-ray photon probe, a photon information acquisition subsystem, an energy subsystem, a TOA data processing subsystem and a pulse star-time conversion module.
The X-ray photon probe is an array type optical and mechanical integrated structure and comprises a large-area array X-ray optical module and an X-ray sensor array. The large-area array X-ray optical module is used for realizing focusing collection of pulsar weak photon signals and shielding of spatial background noise; the X-ray sensor array adopts mature X-ray sensors, and a plurality of X-ray sensors are regularly arranged to form an array and are used for realizing photoelectric conversion, signal extraction and signal filtering forming (including slow forming and fast forming) of weak photon signals collected by the large-area array X-ray optical module and finally outputting two paths of photon signals for subsequent energy and time processing.
The X-ray photon probe ensures the curing of the detection array and the thermal stability and reliability of the structural force through integrated optimization design, and ensures that all the detection arrays are consistent in pointing direction through optical precision calibration and adjustment.
The photon information acquisition subsystem comprehensively generates a high-stability frequency signal through a high-stability crystal oscillator and an internal CPT (Coherent Population Trapping) atomic clock; the subsystem carries out time marking processing on one path of photon signals output by the X-ray photon probe and carries out digital acquisition; and meanwhile, the other path of photon signal is discriminated and judged through a time scale, an ADC is controlled to acquire photon energy information, and an X-ray photon arrival time sequence is generated by the photon energy information and the photon signal with the time mark.
The energy subsystem is used for supplying power to the whole month-based X-ray pulsar observation equipment.
The TOA data processing subsystem is mainly responsible for completing preprocessing of an X-ray photon arrival time sequence, large-scale space-time conversion, contour folding and standard contour comparison, and finally outputting high-precision pulse arrival time TOA. In fig. 4, the data processing flow of the TOA data processing subsystem is further described.
The X-ray photon arrival time sequence preprocessing comprises the following steps: and carrying out data decoding on the input X-ray photon arrival time sequence, counting the number of photons in each time period, and taking the screened data as a final photon sequence if the number of photons in a certain time period is increased sharply and the background noise influence in the short time is large, wherein the data in the time period needs to be removed.
The large-scale space-time conversion is as follows: the pulsar phase time model is defined at the solar system centroid SSB, the adopted time scale is TCB (centroid coordinate time), and the time of arrival of the X-ray photon radiated by the pulsar at the detector is the fixed time recorded by the atomic clock in the detector body coordinate system, so that the fixed time needs to be subjected to time transformation including delay corrections such as Roemer delay and Shapiro delay by calling the solar system ephemeris and pulsar database, and the time transformation can be referred to the formula (1) so as to obtain the photon arrival time normalized to TCB.
The contour folding and the standard contour comparison refer to: the pulse profile is synchronously averaged from a large number of individual pulses. In order to extract the pulse profile, all photons are aligned according to the arrival time of a single photon, the pulse profile is obtained by folding an epoch, and then the pulse profile obtained by folding is compared with a standard pulse profile by adopting a cross-correlation method to obtain the TOA (time of arrival) of the pulse.
The pulse arrival time to pulsar time conversion includes: and performing reference frame transformation on the obtained TOA, converting the TOA into the TOA in a solar system centroid coordinate system, comparing the TOA with a timing model obtained by an ephemeris to obtain a timing residual error, feeding back the timing model by the residual error, calibrating error items such as frequency drift, scale difference and the like in the pulsar time model, and updating the error items of the pulsar time by combining the daily calibration of the frequency of an atomic clock to finally obtain the pulsar time. Wherein, the mathematical expression of the pulsar time model is as follows:
wherein, tNIs the pulsar time to be calculated, t0Is the calculated starting time, P0Is the period of the pulse, (N-N)0) Is the difference between the current pulse signal and the first observed pulse signal, and r (t) is an error term including frequency drift, etc.
After the lunar-based X-ray pulsar observation equipment generates pulsar time, the time data fusion equipment receives the pulsar time and atomic clock time generated by an atomic clock group, the pulsar time and the atomic clock time are combined, the high-precision pulsar time is utilized to correct the long-term clock difference of the atomic clock, and finally, the high-precision and high-stability comprehensive time reference is obtained, and the method can be called as combination.
And the pulsar-time conversion module is used for converting the pulse arrival time output by the TOA data processing subsystem into pulsar-time.
Referring to fig. 5, the specific workflow of the time data fusion device is as follows: firstly, receiving a plurality of pulsar time data and a plurality of atomic clock time data, respectively carrying out sampling noise preprocessing and filtering on the data, and then carrying out sampling rate homogenization on the pulsar time data; then, converting the two time scales to the same reference scale; then, the jump value and the abnormal value in the pulsar time data and the atomic clock time data are processed, and once the jump value or the abnormal value is found, the input of the moment is replaced by the predicted value of the previous moment; then, calculating the Allen variances of different sources (namely pulsar time and atomic clock time), defining the weights of the different sources according to the variances, and smoothing a weight equation, thereby realizing the correction of the long-term clock error of the atomic clock by utilizing the high-precision pulsar time; then, performing Kalman filtering by taking phase, frequency and frequency drift as state vectors to obtain a combined time scale; after each filtering, carrying out calibration feedback on the difference between the combination time and the pulsar time; and finally, removing constant frequency drift and outputting the combination time.
On one hand, the lunar-based pulsar time reference generation system establishes pulsar signal detection equipment on the lunar surface, so that a working platform of the equipment for receiving X-ray pulsar signals becomes very stable, the requirements on the size, the power consumption and the like of the equipment are not limited, the complexity of the X-ray pulsar signal receiving equipment is greatly reduced, and the working performance is improved; on the other hand, the pulsar time and the atomic clock time are combined, so that the advantages of the two time systems are complementary, the advantages of the two time systems are made up for the deficiencies, the advantages of good pulsar time period stability and good atomic clock time short-term stability are fully exerted, and the defects of the pulsar time period stability and the atomic clock time short-term stability are overcome.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A system for generating a lunar-based pulsar time reference, the system being disposed on a lunar surface, the system comprising: the system comprises a lunar-base X-ray pulsar observation device, an atomic clock group and a time data fusion device; wherein the content of the first and second substances,
the lunar-based X-ray pulsar observation equipment is used for acquiring and recording the pulse arrival time of the X-ray pulsar and converting the pulse arrival time into pulsar time; the atomic clock group is used for providing atomic clock time; the time data fusion equipment is used for combining pulsar time and atomic clock time to generate a month-based pulsar time reference;
wherein the time data fusion device combining pulsar time and atomic clock time comprises: firstly, receiving a plurality of pulsar time data and a plurality of atomic clock time data, respectively carrying out sampling noise preprocessing and filtering on the data, and then carrying out sampling rate homogenization on the pulsar time data; then, converting the two time scales to the same reference scale; then, the jump value and the abnormal value in the pulsar time data and the atomic clock time data are processed, and once the jump value or the abnormal value is found, the input of the moment is replaced by the predicted value of the previous moment; then, calculating the Allen variances of different sources, defining the weights of the different sources according to the variances, and smoothing a weight equation, so that the long-term clock error of the atomic clock is corrected by using pulsar hours; then, performing Kalman filtering by taking phase, frequency and frequency drift as state vectors to obtain a combined time scale; after each filtering, carrying out calibration feedback on the difference between the combination time and the pulsar time; and finally, removing constant frequency drift, and outputting combined time, namely the lunar-base pulsar time reference.
2. The month-based pulsar time reference generation system according to claim 1, wherein the month-based X-ray pulsar observation device comprises: the system comprises an X-ray photon probe, a photon information acquisition subsystem, an energy subsystem, a TOA data processing subsystem and a pulse star-time conversion module; wherein the content of the first and second substances,
the X-ray photon probe is used for focusing and collecting pulsar weak photon signals, and then performing photoelectric conversion, signal extraction and filter forming on the collected weak photon signals to obtain two photon signals;
the photon information acquisition subsystem carries out time marking processing on one path of photon signals, carries out digital acquisition, discriminates and judges the other path of photon signals through time marks, and acquires photon energy information; generating a time sequence of X-ray photon arrival from the photon energy information and the time-stamped photon signals;
the TOA data processing subsystem is used for preprocessing the X-ray photon arrival time sequence, performing large-scale space-time conversion, folding the contour and comparing the contour with a standard contour, and outputting the pulse arrival time TOA;
the pulse satellite-time conversion module is used for converting pulse arrival time into pulse satellite time;
the energy subsystem is used for supplying power to the whole month-based X-ray pulsar observation equipment.
3. The system of claim 2, wherein the preprocessing of the X-ray photon time of arrival sequence comprises: and carrying out data decoding on the input X-ray photon arrival time sequence, counting the number of photons in each time period, removing the data in a certain time period if the number of photons in the certain time period is increased sharply, and taking the screened data as a final photon sequence.
4. The system according to claim 2, wherein the large-scale spatiotemporal transformation comprises: and calling a solar system ephemeris and a pulsar database, and performing time transformation including Roemer delay and Shapiro delay on the X-ray photon arrival time sequence, so that the X-ray photon arrival time is converted into a mass center coordinate under the solar system mass center coordinate from the time recorded by an atomic clock under a detector body coordinate system.
5. The system of claim 2, wherein the contour folding and comparison to a standard contour comprises: aligning and arranging all photons according to the arrival time of a single photon, obtaining a pulse profile through epoch folding, and comparing the pulse profile obtained through folding with a standard pulse profile by adopting a cross-correlation method to obtain the TOA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911036131.4A CN110780583B (en) | 2019-10-29 | 2019-10-29 | Moon-based pulsar time reference generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911036131.4A CN110780583B (en) | 2019-10-29 | 2019-10-29 | Moon-based pulsar time reference generation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110780583A CN110780583A (en) | 2020-02-11 |
| CN110780583B true CN110780583B (en) | 2021-09-10 |
Family
ID=69387265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911036131.4A Active CN110780583B (en) | 2019-10-29 | 2019-10-29 | Moon-based pulsar time reference generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110780583B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665709B (en) * | 2020-06-29 | 2021-10-15 | 北京东方计量测试研究所 | Method for unifying time in wide area space and space time keeping system |
| CN113078901B (en) * | 2021-03-30 | 2024-02-13 | 中国科学院国家授时中心 | Atomic clock accuracy improving method based on pulsar drive |
| CN113238474B (en) * | 2021-05-06 | 2022-03-15 | 中国科学院国家授时中心 | Pulse star time signal ground reproduction system |
| CN113219815B (en) * | 2021-05-06 | 2022-06-07 | 中国科学院国家授时中心 | Deep space time service method based on X-ray pulsar |
| CN113433817B (en) * | 2021-06-24 | 2022-10-11 | 贵州射电天文台 | Pulsar clock system and method based on FAST pulsar observation |
| CN116611025B (en) * | 2023-05-19 | 2024-01-26 | 贵州师范大学 | Multi-mode feature fusion method for pulsar candidate signals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038169A (en) * | 2007-02-13 | 2007-09-19 | 北京空间飞行器总体设计部 | Navigation satellite autonomous navigation system and method based on X-ray pulsar |
| CN101178312A (en) * | 2007-12-12 | 2008-05-14 | 南京航空航天大学 | Spacecraft shading device combined navigation methods based on multi-information amalgamation |
| CN103048000A (en) * | 2012-12-29 | 2013-04-17 | 中国空间技术研究院 | X-ray pulsar navigation ground test system |
| CN103047986A (en) * | 2012-12-29 | 2013-04-17 | 中国空间技术研究院 | Large-scale space-time and on-orbit dynamic effect simulation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7197381B2 (en) * | 2003-12-08 | 2007-03-27 | University Of Maryland | Navigational system and method utilizing sources of pulsed celestial radiation |
-
2019
- 2019-10-29 CN CN201911036131.4A patent/CN110780583B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038169A (en) * | 2007-02-13 | 2007-09-19 | 北京空间飞行器总体设计部 | Navigation satellite autonomous navigation system and method based on X-ray pulsar |
| CN101178312A (en) * | 2007-12-12 | 2008-05-14 | 南京航空航天大学 | Spacecraft shading device combined navigation methods based on multi-information amalgamation |
| CN103048000A (en) * | 2012-12-29 | 2013-04-17 | 中国空间技术研究院 | X-ray pulsar navigation ground test system |
| CN103047986A (en) * | 2012-12-29 | 2013-04-17 | 中国空间技术研究院 | Large-scale space-time and on-orbit dynamic effect simulation method |
Non-Patent Citations (2)
| Title |
|---|
| 基于X射线脉冲星的月球卫星自主导航;姚翔 等;《电光与控制》;20150930;第22卷(第9期);89-95 * |
| 脉冲星数字终端技术综述;张海龙 等;《中国科学：物理学 力学 天文学》;20190930;第49卷(第9期);099503-1-099503-14 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110780583A (en) | 2020-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110780583B (en) | Moon-based pulsar time reference generation system | |
| Smith et al. | The lunar orbiter laser altimeter investigation on the lunar reconnaissance orbiter mission | |
| Brown et al. | Hubble Space Telescope time-series photometry of the transiting planet of HD 209458 | |
| CN111665709B (en) | Method for unifying time in wide area space and space time keeping system | |
| CN101608919B (en) | X-ray pulsar navigation embedded simulation system based on semiconductor laser | |
| CN103017774B (en) | Pulsar navigation method with single detector | |
| Deng et al. | Interplanetary spacecraft navigation using pulsars | |
| US9140556B1 (en) | Method and system for gamma-ray localization induced spacecraft navigation using celestial gamma-ray sources | |
| Meng et al. | Design and experiment of onboard laser time transfer in Chinese Beidou navigation satellites | |
| Zhang et al. | Mission Overview and Initial Observation Results of the X‐Ray Pulsar Navigation‐I Satellite | |
| CN103063217A (en) | Deep space detector astronomy/radio combination navigation method based on ephemeris correction | |
| Chelovekov et al. | Type i X-ray bursts detected by the JEM-X telescope onboard the INTEGRAL observatory in 2003–2015 | |
| Vanderburg et al. | First Doppler Limits on Binary Planets and Exomoons in the HR 8799 System | |
| Cremons et al. | Small PN-code LiDAR for asteroid and comet missions—receiver processing and performance simulations | |
| Gillon et al. | The Spitzer search for the transits of HARPS low-mass planets-I. No transit for the super-Earth HD 40307b | |
| CN107144274B (en) | In-orbit X-ray pulsar timing model construction method | |
| CN108981749B (en) | Ground simulation verification system for X-ray pulsar angular position measurement and use method thereof | |
| Kucharski et al. | 22 Years of AJISAI spin period determination from standard SLR and kHz SLR data | |
| Cusumano et al. | Timing accuracy of the Swift X-Ray Telescope in WT mode | |
| Kucharski et al. | Spin parameters of High Earth Orbiting satellites ETALON-1 and ETALON-2 determined from kHz Satellite Laser Ranging data | |
| CN114035418A (en) | Common view time comparison method based on pulsar | |
| Kucharski et al. | Spectral response of Experimental Geodetic Satellite determined from high repetition rate SLR data | |
| Yan et al. | Phase Evolution of the Crab Pulsar between Radio and X-ray | |
| RU2316034C1 (en) | Method of synchronizing atomic clock | |
| Kucharski et al. | Spin parameters of low Earth orbiting satellites Larets and Stella determined from satellite laser ranging data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |