阅读说明：本技术 一种原子频标远程时间频率校准方法、设备及系统 (Atomic frequency standard remote time frequency calibration method, equipment and system ) 是由 张然 于 2020-04-26 设计创作，主要内容包括：本申请公开了一种原子频标远程时间频率校准方法、设备及系统,该方法包括：通过卫星向至少一个待测原子频标设备以及主站原子频标设备发送卫星系统时间；获取待测原子频标设备的输出时间与卫星系统时间的待测站单站钟差数据,以及获取主站单站钟差数据；根据待测站单站钟差数据和主站单站钟差数据,解算时间参量；其中,时间参量包括时间偏差、相对频率偏差、频率日漂移率和频率稳定度中的至少一种；根据时间参量,确定至少一个待测原子频标设备的时间频率校准结果。通过采用本方案,可以在远程情况下,实现原子频标与标准设备之间的校准,提高了原子频标时间频率校准的效率,并且无需特殊的校准条件限制,方案实用性更强。(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.)

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, T_ABThe time deviation between the station to be detected and the master station is obtained; t is t_ABiThe 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 is_AB(tau) is the relative frequency deviation of the atomic frequency standard of the station to be measured within the time interval tau; t0_ABiThe common view time difference between the zero point station to be detected and the master station on the ith day is set; t0_AB(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 is_ABThe daily drift rate of the atomic frequency standard frequency of the station to be detected; y is_ABi(τ) is the relative frequency deviation measured on day i; tau is a time interval and is taken for 1 day; t is t_iThe 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.

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, T_ABThe time deviation between the station to be detected and the master station is obtained; t is t_ABiThe 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 is_AB(tau) is the relative frequency deviation of the atomic frequency standard of the station to be measured within the time interval tau; t0_ABiThe common view time difference between the zero point station to be detected and the master station on the ith day is set; t0_AB(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 is_ABThe daily drift rate of the atomic frequency standard frequency of the station to be detected; y is_ABi(τ) is the relative frequency deviation measured on day i; tau is a time interval and is taken for 1 day; t is t_iThe 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.