CN111552171A - Atomic frequency standard remote time frequency calibration method, equipment and system - Google Patents
Atomic frequency standard remote time frequency calibration method, equipment and system Download PDFInfo
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- CN111552171A CN111552171A CN202010339003.3A CN202010339003A CN111552171A CN 111552171 A CN111552171 A CN 111552171A CN 202010339003 A CN202010339003 A CN 202010339003A CN 111552171 A CN111552171 A CN 111552171A
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- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/06—Decoding time data; Circuits therefor
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Abstract
The application discloses a method, equipment and a system for calibrating atomic frequency standard remote time frequency, wherein the method comprises the following steps: sending satellite system time to at least one atomic frequency standard device to be tested and a master station atomic frequency standard device through a satellite; acquiring clock error data of a single station to be tested of the output time of the atomic frequency standard equipment to be tested and the time of a satellite system, and acquiring clock error data of a single station of a main station; resolving a time parameter according to the clock error data of the single station of the station to be detected and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability; and determining a time frequency calibration result of at least one atomic frequency standard device to be tested according to the time parameters. By adopting the scheme, the calibration between the atomic frequency standard and the standard equipment can be realized under the remote condition, the efficiency of the atomic frequency standard time frequency calibration is improved, special calibration condition limitation is not needed, and the scheme has stronger practicability.
Description
Technical Field
The present application relates to the field of time frequency calibration technologies, and in particular, to a method, a device, and a system for calibrating an atomic frequency standard remote time frequency.
Background
With the rapid development of the scientific and technological level, accurate local reference time and reference frequency are adopted in laboratories in various regions in China, and common standard time frequency sources are high-performance atomic frequency standards such as a hydrogen atomic frequency standard and a cesium atomic frequency standard. The traditional atomic frequency standard calibration mode is that a calibration user compares an atomic frequency standard to be calibrated with a higher-level measurement standard, and then the atomic frequency standard is traced to an international system unit step by step. The calibration mode is not only complex and has poor timeliness, but also has influence on the atomic frequency standard in aspects of power supply, vibration and the like.
Disclosure of Invention
The embodiment of the application provides a method, equipment and a system for calibrating atomic frequency standard remote time frequency. According to the scheme, the calibration between the atomic frequency standard and the standard equipment can be realized under the remote condition, the efficiency of the atomic frequency standard time frequency calibration is improved, special calibration condition limitation is not needed, and the scheme is higher in practicability.
The embodiment of the application provides an atomic frequency standard remote time frequency calibration method, which comprises the following steps:
sending satellite system time to at least one atomic frequency standard device to be tested and a master station atomic frequency standard device through a satellite;
acquiring single-station clock error data of the output time of the atomic frequency standard equipment to be detected and the satellite system time to be detected, and acquiring single-station clock error data of the output time of the main station atomic frequency standard equipment and the satellite system time to be detected;
resolving a time parameter according to the clock error data of the single station of the station to be measured and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability;
and determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
Further, acquiring the output time of the atomic frequency standard device to be measured and the clock error data of the single station to be measured of the satellite system time, and acquiring the output time of the master station atomic frequency standard device and the clock error data of the master station single station of the satellite system time includes:
adopting a rapid common-view time comparison technology in the atomic frequency standard equipment to be detected, and taking every 100s as an observation period to obtain observation data; wherein the observation data comprises 100 initial clock error data;
screening the initial clock error data to obtain single-station clock error data of the station to be detected in the current observation period; and the number of the first and second groups,
a rapid common-view time comparison technology is adopted in the master station atomic frequency standard device, and observation data are obtained by taking every 100s as an observation period; wherein the observation data comprises 100 initial clock error data;
and screening the initial clock error data to obtain the master station single-station clock error data of the current observation period.
Further, after the 100s observation of the current observation period is completed, the 100s observation process of the next observation period is entered.
Further, resolving a time parameter according to the clock error data of the single station of the station to be measured and the clock error data of the single station of the main station comprises:
generating a common-view time difference sequence of the station to be detected and the master station according to the clock difference data of the single station of the station to be detected and the clock difference data of the single station of the master station;
determining the common view time difference of the zero points of each day by adopting a preset algorithm; wherein the preset algorithm comprises a least squares linear fitting algorithm;
and resolving a time parameter according to the common view time difference sequence of the station to be detected and the main station and the common view time difference of the zero point every day.
Further, resolving a time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point every day, comprising:
the time offset is calculated using the following formula:
wherein, TABThe time deviation between the station to be detected and the master station is obtained; t is tABiThe ith common view time difference between the station to be detected and the master station; and n is the total number of the common view time difference sequences of the station to be detected and the master station.
Further, resolving a time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point every day, comprising:
the relative frequency deviation is calculated using the following formula:
wherein tau is a time interval and is taken for 1 day; y isAB(tau) is the relative frequency deviation of the atomic frequency standard of the station to be measured within the time interval tau; t0ABiThe common view time difference between the zero point station to be detected and the master station on the ith day is set; t0AB(i+1)And the zero point station to be detected and the master station share the sight time difference for the (i + 1) th day.
Further, resolving a time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point every day, comprising:
calculating the daily frequency drift rate by adopting the following formula:
wherein k isABThe daily drift rate of the atomic frequency standard frequency of the station to be detected; y isABi(τ) is the relative frequency deviation measured on day i; tau is a time interval and is taken for 1 day; t is tiThe day i of julian days,
is the average value of N days of julian days.
Further, resolving a time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point every day, comprising:
calculating the 100s frequency stability, the 1000s frequency stability and the 10000s frequency stability of an atomic frequency standard according to the common view time difference sequence of the station to be detected and the master station by adopting an Allen variance algorithm; and calculating the daily stability according to the common view time difference of the daily zero point.
Further, after determining the time frequency calibration result of the at least one atomic frequency standard device under test, the method further includes:
and generating a calibration report according to the calibration result, and sending the calibration report to a user of the atomic frequency standard equipment to be tested.
The embodiment of the present application further provides an atomic frequency standard remote time frequency calibration device, where the device includes:
the satellite system time sending module is used for sending satellite system time to at least one atomic frequency standard device to be detected and the master station atomic frequency standard device through a satellite;
the clock error data receiving module is used for acquiring the output time of the atomic frequency standard equipment to be detected and the clock error data of the single station of the satellite system time to be detected, and acquiring the output time of the main station atomic frequency standard equipment and the clock error data of the single station of the main station of the satellite system time;
the time parameter determining module is used for resolving time parameters according to the clock error data of the single station of the station to be detected and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability;
and the time frequency calibration module is used for determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
The atomic frequency standard remote time frequency calibration system that this application embodiment provided, the system includes:
the atomic frequency standard device to be tested is connected with the satellite and used for receiving the satellite system time and determining the clock error data of the single station of the station to be tested based on the rapid common-view time comparison technology;
the main station atomic frequency standard device is connected with the satellite and used for receiving the satellite system time and determining the clock error data of a main station single station based on the rapid common-view time comparison technology;
the data transmission unit is connected with the atomic frequency standard device to be tested and the master station atomic frequency standard device and is used for transmitting the clock error data of the single station of the station to be tested and the clock error data of the single station of the master station to the data processing unit;
and the data processing unit is used for processing calibration data according to the clock error data of the single station of the station to be tested and the clock error data of the single station of the main station, and generating a calibration report.
The embodiment of the application adopts the following technical scheme: sending satellite system time to at least one atomic frequency standard device to be tested and a master station atomic frequency standard device through a satellite; acquiring single-station clock error data of the output time of the atomic frequency standard equipment to be detected and the satellite system time to be detected, and acquiring single-station clock error data of the output time of the main station atomic frequency standard equipment and the satellite system time to be detected; resolving a time parameter according to the clock error data of the single station of the station to be measured and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability; and determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: the remote time frequency calibration system realizes continuous high-precision calibration of the local time of the remote user atomic frequency standard and the reference time of the master station based on a quick common-view time comparison technology. The quick common-view time comparison technology takes 100s as an observation period, a common-view time table is newly established, the time difference between the atomic frequency standard output time and the GNSS system time is continuously observed, adjacent observation periods are in seamless connection, and data waste of tracking blind areas in a traditional common-view mode is avoided.
In the scheme, the measuring terminal is a core part of the remote time frequency calibration system and mainly completes the work of data acquisition and data calculation of the receiver, sending the calculation result to the data processing unit through the data transmission unit and the like. The data transmission unit is compatible with various modes of network transmission, Beidou short message and GPRS transmission. The data processing unit is an important component of the system and is mainly responsible for calculating common-view time difference calculation and calibration items such as time deviation, relative frequency deviation, daily frequency drift rate, frequency stability and the like. The atomic frequency standard remote time frequency calibration system breaks through the traditional common-view timetable, realizes gapless high-precision calibration of the atomic frequency standard of a remote user, and promotes the development of time frequency metering service.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of an atomic frequency standard remote time frequency calibration method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a fast common view time comparison process according to an embodiment of the present application;
fig. 3 is a schematic diagram of a data processing flow according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an atomic frequency standard remote time frequency calibration apparatus according to a second embodiment of the present application;
fig. 5 is a schematic diagram of a framework of an atomic frequency standard remote time frequency calibration system according to a third embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
The satellite common-view time comparison is one of the most extensive international modes for realizing remote time transmission at present, is simple and easy to implement, and is low in cost, a traditional common-view mode takes 16min as an observation period, each observation period needs an observation interval of 3min, and the observation period is long and intermittent measurement makes remote users unable to realize true traceability. Therefore, the method for researching satellite common-view quick continuous observation is an urgent problem to be solved for establishing an atomic frequency standard remote time frequency calibration system.
Example one
Fig. 1 is a schematic diagram of an atomic frequency standard remote time frequency calibration method according to an embodiment of the present disclosure. The atomic frequency standard remote time frequency calibration method can be executed by the atomic frequency standard remote time frequency calibration device provided by the embodiment of the application, and the device can comprise a software and/or hardware functional module. As shown in fig. 1, the method includes:
and S11, sending the satellite system time to at least one atomic frequency standard device to be tested and the master atomic frequency standard device through the satellite.
The satellite may be a global navigation satellite system, and the observed quantity may be a pseudo range, an ephemeris, a satellite transmission time, and the like of a set of satellites. The global navigation satellite system is a space-based radio navigation positioning system that can provide users with all-weather 3-dimensional coordinates and velocity and time information at any location on the earth's surface or in near-earth space. Specifically, the satellite system can be a Beidou navigation satellite, a GPS satellite and other satellites.
The satellite can send the satellite system time information to the main station atomic frequency standard equipment and the atomic frequency standard equipment to be detected in a mode of sending data to the main station atomic frequency standard equipment and the atomic frequency standard equipment to be detected. The transmitted data may be continuous, and is used to provide a data base for the master atomic frequency standard device and the atomic frequency standard device to be tested.
The atomic frequency standard equipment of the master station can be composed of a quick common-view device, an electronic counter, an atomic frequency standard and other equipment, and the atomic frequency standard of the master station can be an atomic frequency standard with higher accuracy. The number of the atomic frequency standard devices to be tested can be one or more. It can be understood that one or more atomic frequency standard devices to be tested can be calibrated simultaneously through one master atomic frequency standard device.
And S12, acquiring the output time of the atomic frequency standard equipment to be detected and the clock error data of the single station to be detected of the satellite system time, and acquiring the output time of the main station atomic frequency standard equipment and the clock error data of the main station single station of the satellite system time.
The output time of the atomic frequency standard device to be tested and the output time of the master station atomic frequency standard device are generated based on the internal atomic frequency standard, and are subtracted from the satellite system time, so that master station single-station clock error data and master station single-station clock error data can be obtained. Therefore, the accuracy of the atomic frequency standard equipment to be tested can be evaluated according to the clock error data of the single station of the station to be tested and the clock error data of the single station of the master station.
In this embodiment, optionally, the acquiring clock error data of the atomic frequency standard device to be measured and the single station to be measured of the satellite system time, and the acquiring clock error data of the master station atomic frequency standard device and the master station single station of the satellite system time include:
adopting a rapid common-view time comparison technology in the atomic frequency standard equipment to be detected, and taking every 100s as an observation period to obtain observation data; wherein the observation data comprises 100 initial clock error data;
screening the initial clock error data to obtain single-station clock error data of the station to be detected in the current observation period; and the number of the first and second groups,
a rapid common-view time comparison technology is adopted in the master station atomic frequency standard device, and observation data are obtained by taking every 100s as an observation period; wherein the observation data comprises 100 initial clock error data;
and screening the initial clock error data to obtain the master station single-station clock error data of the current observation period.
Fig. 2 is a schematic diagram of a fast common view time comparison process according to an embodiment of the present application. As shown in fig. 2, firstly, the serial input/output buffer of the receiver is cleared to receive data sent by a satellite, and then the serial output buffer of the acquisition receiver outputs the data to acquire relevant information of the satellite data, specifically, the information may include acquisition receiver time information, satellite ephemeris information, visible satellite information, ionosphere parameter information, and the like, and further, whether the data is valid data is determined according to the information. And if the current observation period continues to be observed for 100s, the observation of the current period is considered to be finished, and data processing is carried out on the data observed in the current period to obtain the observation result of the current observation period.
Specifically, a rapid common-view time comparison technology is utilized to realize remote time transmission, and the work flow comprises three parts of data acquisition, data calculation and data transmission. Firstly, data such as receiver time information, satellite ephemeris information, visible satellite information, ionosphere parameter information and the like are acquired every second through a serial port. And then, under the condition that the acquired data are effective, time difference between the local atomic frequency standard reference time and the GNSS system time is calculated. The quick common-view time comparison technology shortens the observation period to 100s, reformulates a common-view time table, and realizes remote quick continuous time comparison. After finishing a 100s observation period, processing data of the 100s observation period, which mainly comprises two steps: firstly, averagely dividing the 100s observation data in the period into 10 groups, and fitting 10 midpoint values according to least square quadratic fit; and secondly, solving a midpoint value of 10 midpoint values through least square linear fitting to serve as a final output result. And finally, sending the final calculation result to a data processing unit through a data transmission unit for data processing.
On the basis of the above technical solution, optionally, after the 100s observation of the current observation period is completed, the 100s observation process of the next observation period is entered. Through the setting, the calculation time does not need to be waited, the time frequency calibration efficiency of the scheme is improved, and the effect that the time frequency calibration has real-time performance is achieved.
S13, resolving a time parameter according to the clock error data of the single station of the station to be tested and the clock error data of the single station of the main station; wherein the time parameter includes at least one of a time deviation, a relative frequency deviation, a daily frequency drift rate, and a frequency stability.
In the scheme, the clock error data of the single station of the station to be tested and the clock error data of the single station of the main station can be sent to a data processing unit, and time parameters are calculated, wherein the time parameters comprise at least one of time deviation, relative frequency deviation, frequency daily drift frequency and frequency stability.
In this scheme, optionally, resolving a time parameter according to the clock error data of the single station of the station to be measured and the clock error data of the single station of the master station includes:
generating a common-view time difference sequence of the station to be detected and the master station according to the clock difference data of the single station of the station to be detected and the clock difference data of the single station of the master station;
determining the common view time difference of the zero points of each day by adopting a preset algorithm; wherein the preset algorithm comprises a least squares linear fitting algorithm;
and resolving a time parameter according to the common view time difference sequence of the station to be detected and the main station and the common view time difference of the zero point every day.
It is understood that there may be a corresponding relationship between the common-view time difference sequences, for example, for each second of the satellite system time, one clock difference data may be generated by the master station and the station to be tested, and the two data may be associated with each other in a serial number or other form, so that what the clock difference data of the master station and the station to be tested are respectively can be obtained at the same time, and a sequence can be formed, and the master station and the station to be tested can be analyzed in a full time period.
Fig. 3 is a schematic diagram of a data processing flow according to an embodiment of the present application. The steps therein may be performed by a data processing unit. As shown in fig. 3, after receiving the clock difference data of the remote user and the clock difference data of the master station, the data processing unit obtains a common-view time difference sequence between the remote user and the master station through common-view data processing software, and obtains a common-view time difference of a zero point of each day according to a least square linear fitting algorithm, and calculates time parameters such as time deviation, relative frequency deviation, frequency daily drift rate, frequency stability and the like, by using the common-view time difference data between the remote user and the master station and the common-view time difference sequence of the zero point of the remote user and the master station as input data.
And S14, determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
The stability or accuracy of the atomic frequency standard equipment to be tested can be evaluated according to one or more time parameters, and then the calibration result is determined.
In this embodiment, the calculation of the time parameter may be performed as follows.
Wherein, the remote user and the main station share the sight time difference sequence tABi(i is 1,2 … n) is averaged, i.e. the time deviation T between the remote user and the master station is obtainedAB。
In this embodiment, optionally, calculating the time parameter according to the common view time difference sequence of the station to be measured and the master station and the common view time difference of the zero point every day includes:
the time offset is calculated using the following formula:
wherein, TABThe time deviation between the station to be detected and the master station is obtained; t is tABiThe ith common view time difference between the station to be detected and the master station; and n is the total number of the common view time difference sequences of the station to be detected and the master station.
Relative frequency deviation yAB(τ) (τ ═ 1d), the difference can be calculated using the zero-point co-view time difference between the two adjacent days.
In this embodiment, optionally, calculating the time parameter according to the common view time difference sequence of the station to be measured and the master station and the common view time difference of the zero point every day includes:
the relative frequency deviation is calculated using the following formula:
wherein tau is a time interval and is taken for 1 day; y isAB(tau) is the relative frequency deviation of the atomic frequency standard of the station to be measured within the time interval tau; t0ABiThe common view time difference between the zero point station to be detected and the master station on the ith day is set; t0AB(i+1)And the zero point station to be detected and the master station share the sight time difference for the (i + 1) th day.
The remote calibration system can continuously measure N days (N is more than or equal to 15) to obtain N relative frequency deviation values yAB(τ) (τ ═ 1d), and the daily frequency drift rate k is calculated according to the least square linear fitting algorithmAB。
In this embodiment, optionally, calculating the time parameter according to the common view time difference sequence of the station to be measured and the master station and the common view time difference of the zero point every day includes:
calculating the daily frequency drift rate by adopting the following formula:
wherein k isABThe daily drift rate of the atomic frequency standard frequency of the station to be detected; y isABi(τ) is the relative frequency deviation measured on day i; tau is a time interval and is taken for 1 day; t is tiThe day i of julian days,
is the average value of N days of julian days.
In this embodiment, optionally, calculating the time parameter according to the common view time difference sequence of the station to be measured and the master station and the common view time difference of the zero point every day includes:
calculating the 100s frequency stability, the 1000s frequency stability and the 10000s frequency stability of an atomic frequency standard according to the common view time difference sequence of the station to be detected and the master station by adopting an Allen variance algorithm; and calculating the daily stability according to the common view time difference of the daily zero point.
Specifically, the calculation formula of the allen variance is as follows:
wherein: x is the number ofiIs a common view time difference sequence; n is the common view time difference sampling number; τ is the sampling interval, and τ can take 100s, 1000s, 10000s, 1 d.
According to the technical scheme, satellite system time is sent to at least one atomic frequency standard device to be tested and a master station atomic frequency standard device through a satellite; acquiring single-station clock error data of the output time of the atomic frequency standard equipment to be detected and the satellite system time to be detected, and acquiring single-station clock error data of the output time of the main station atomic frequency standard equipment and the satellite system time to be detected; resolving a time parameter according to the clock error data of the single station of the station to be measured and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability; and determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter. By executing the scheme, the calibration between the atomic frequency standard and the standard equipment can be realized under the remote condition, the efficiency of the atomic frequency standard time frequency calibration is improved, special calibration condition limitation is not needed, and the scheme has stronger practicability.
On the basis of the foregoing technical solutions, optionally, after determining a time frequency calibration result of the at least one atomic frequency standard device to be measured, the method further includes: and generating a calibration report according to the calibration result, and sending the calibration report to a user of the atomic frequency standard equipment to be tested. Through the arrangement, the user of the atomic frequency standard equipment to be tested can trace to the high-precision atomic frequency standard equipment, so that the atomic frequency standard equipment used by the user is more accurate.
Example two
The atomic frequency standard remote time frequency calibration device provided in this embodiment may execute the atomic frequency standard remote time frequency calibration method provided in this embodiment, and has corresponding functional modules and beneficial effects.
Fig. 4 is a schematic structural diagram of an atomic frequency standard remote time frequency calibration apparatus according to a second embodiment of the present application. As shown in fig. 4, the atomic frequency standard remote time frequency calibration apparatus includes:
the satellite system time sending module 410 is configured to send satellite system time to at least one to-be-detected atomic frequency standard device and the master station atomic frequency standard device through a satellite;
a clock error data receiving module 420, configured to obtain single station clock error data of the output time of the atomic frequency standard device to be detected and the satellite system time, and obtain master station single station clock error data of the output time of the master station atomic frequency standard device and the satellite system time;
the time parameter determining module 430 is configured to calculate a time parameter according to the clock error data of the single station of the to-be-measured station and the clock error data of the single station of the master station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability;
and the time frequency calibration module 440 is configured to determine a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
The atomic frequency standard remote time frequency calibration device provided by the application can be used for executing any steps of the method provided by the embodiment, and achieves corresponding beneficial effects.
EXAMPLE III
Fig. 5 is a schematic diagram of a framework of an atomic frequency standard remote time frequency calibration system according to a third embodiment of the present application. As shown in fig. 5, the system includes:
the atomic frequency standard device to be tested is connected with the satellite and used for receiving the satellite system time and determining the clock error data of the single station of the station to be tested based on the rapid common-view time comparison technology;
the main station atomic frequency standard device is connected with the satellite and used for receiving the satellite system time and determining the clock error data of a main station single station based on the rapid common-view time comparison technology;
the data transmission unit is connected with the atomic frequency standard device to be tested and the master station atomic frequency standard device and is used for transmitting the clock error data of the single station of the station to be tested and the clock error data of the single station of the master station to the data processing unit;
and the data processing unit is used for processing calibration data according to the clock error data of the single station of the station to be tested and the clock error data of the single station of the main station, and generating a calibration report.
The data processing unit is specifically used for processing clock difference data of a remote user and a master station single station by common-view data processing software to obtain a common-view time difference sequence of the remote user and the master station single station; least square linear fitting is carried out on the zero point common view time difference every day; calculating calibration items such as time difference deviation, relative frequency deviation, daily frequency drift rate, frequency stability and the like by taking the common-view time difference sequence and the zero point common-view time difference as input data; and storing the calibration result into a database to generate a calibration report.
The invention provides an atomic frequency standard remote time frequency calibration system, which is based on a quick common-view time comparison technology and aims to solve the problems that an atomic frequency standard of a remote user is not suitable to be moved and transported and the conventional common-view observation data is lost, thereby saving the labor, the financial resources and the time and avoiding the influence on the performance of the atomic frequency standard in the transportation process. Meanwhile, the remote common-view time comparison frequency is improved, and uninterrupted high-precision time transmission is realized.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An atomic frequency standard remote time frequency calibration method, characterized in that the method comprises:
sending satellite system time to at least one atomic frequency standard device to be tested and a master station atomic frequency standard device through a satellite;
acquiring single-station clock error data of the output time of the atomic frequency standard equipment to be detected and the satellite system time to be detected, and acquiring single-station clock error data of the output time of the main station atomic frequency standard equipment and the satellite system time to be detected;
resolving a time parameter according to the clock error data of the single station of the station to be measured and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability;
and determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
2. The method of claim 1, wherein obtaining the clock error data of the atomic frequency standard device to be tested and the satellite system time, and obtaining the clock error data of the master atomic frequency standard device and the satellite system time comprises:
adopting a rapid common-view time comparison technology in the atomic frequency standard equipment to be detected, and taking every 100s as an observation period to obtain observation data; wherein the observation data comprises 100 initial clock error data;
screening the initial clock error data to obtain single-station clock error data of the station to be detected in the current observation period; and the number of the first and second groups,
a rapid common-view time comparison technology is adopted in the master station atomic frequency standard device, and observation data are obtained by taking every 100s as an observation period; wherein the observation data comprises 100 initial clock error data;
and screening the initial clock error data to obtain the master station single-station clock error data of the current observation period.
3. The method according to claim 2, characterized in that after the completion of the 100s observation of the current observation period, the 100s observation procedure of the next observation period is entered.
4. The method of claim 1, wherein calculating time parameters according to the clock error data of the single station to be tested and the clock error data of the single station of the main station comprises:
generating a common-view time difference sequence of the station to be detected and the master station according to the clock difference data of the single station of the station to be detected and the clock difference data of the single station of the master station;
determining the common view time difference of the zero points of each day by adopting a preset algorithm; wherein the preset algorithm comprises a least squares linear fitting algorithm;
and resolving a time parameter according to the common view time difference sequence of the station to be detected and the main station and the common view time difference of the zero point every day.
5. The method of claim 4, wherein calculating the time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point of each day comprises:
the time offset is calculated using the following formula:
wherein, TABThe time deviation between the station to be detected and the master station is obtained; t is tABiThe ith common view time difference between the station to be detected and the master station; and n is the total number of the common view time difference sequences of the station to be detected and the master station.
6. The method of claim 4, wherein calculating the time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point of each day comprises:
the relative frequency deviation is calculated using the following formula:
wherein tau is a time interval and is taken for 1 day; y isAB(tau) is the relative frequency deviation of the atomic frequency standard of the station to be measured within the time interval tau; t0ABiThe common view time difference between the zero point station to be detected and the master station on the ith day is set; t0AB(i+1)And the zero point station to be detected and the master station share the sight time difference for the (i + 1) th day.
7. The method of claim 4, wherein calculating the time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point of each day comprises:
calculating the daily frequency drift rate by adopting the following formula:
wherein k isABThe daily drift rate of the atomic frequency standard frequency of the station to be detected; y isABi(τ) is the relative frequency deviation measured on day i; tau is a time interval and is taken for 1 day; t is tiThe day i of julian days,
is the average value of N days of julian days.
8. The method of claim 4, wherein calculating the time parameter according to the common view time difference sequence of the station to be detected and the master station and the common view time difference of the zero point of each day comprises:
calculating the 100s frequency stability, the 1000s frequency stability and the 10000s frequency stability of an atomic frequency standard according to the common view time difference sequence of the station to be detected and the master station by adopting an Allen variance algorithm; and calculating the daily stability according to the common view time difference of the daily zero point.
9. An atomic frequency standard remote time-frequency calibration device, the device comprising:
the satellite system time sending module is used for sending satellite system time to at least one atomic frequency standard device to be detected and the master station atomic frequency standard device through a satellite;
the clock error data receiving module is used for acquiring the output time of the atomic frequency standard equipment to be detected and the clock error data of the single station of the satellite system time to be detected, and acquiring the output time of the main station atomic frequency standard equipment and the clock error data of the single station of the main station of the satellite system time;
the time parameter determining module is used for resolving time parameters according to the clock error data of the single station of the station to be detected and the clock error data of the single station of the main station; wherein the time parameter comprises at least one of time deviation, relative frequency deviation, daily frequency drift rate and frequency stability;
and the time frequency calibration module is used for determining a time frequency calibration result of the at least one atomic frequency standard device to be tested according to the time parameter.
10. An atomic frequency standard remote time-frequency calibration system, the system comprising:
the atomic frequency standard device to be tested is connected with the satellite and used for receiving the satellite system time and determining the clock error data of the single station of the station to be tested based on the rapid common-view time comparison technology;
the main station atomic frequency standard device is connected with the satellite and used for receiving the satellite system time and determining the clock error data of a main station single station based on the rapid common-view time comparison technology;
the data transmission unit is connected with the atomic frequency standard device to be tested and the master station atomic frequency standard device and is used for transmitting the clock error data of the single station of the station to be tested and the clock error data of the single station of the master station to the data processing unit;
and the data processing unit is used for processing calibration data according to the clock error data of the single station of the station to be tested and the clock error data of the single station of the main station, and generating a calibration report.
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