CN111077759B - Performance evaluation method of spaceborne atomic clock - Google Patents
Performance evaluation method of spaceborne atomic clock Download PDFInfo
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Abstract
The invention provides a performance evaluation method of a satellite-borne atomic clock, which comprises the following steps that firstly, the satellite-borne atomic clock comprises a main clock and a hot standby clock, an uplink pseudo range value between the satellite and the ground is measured by a satellite, and a downlink pseudo range value between the satellite and the ground is measured by a ground operation and control system; secondly, a satellite time-frequency processing system measures and records the clock error of the hot standby clock relative to the main clock in real time; thirdly, the uplink pseudo range value is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system calculates the clock error of the main clock relative to the ground reference atomic clock in the sampling period according to the downlink pseudo range value and the uplink pseudo range value; and fourthly, the clock difference of the hot standby clock relative to the main clock is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system obtains the clock difference of the hot standby clock relative to the ground reference atomic clock according to the clock difference of the main clock relative to the ground reference atomic clock and the clock difference of the hot standby clock relative to the main clock.
Description
Technical Field
The invention relates to the technical field of satellite-borne atomic clocks, in particular to a method for evaluating performance of a satellite-borne atomic clock.
Background
The satellite-borne atomic clock is a core single machine of a navigation satellite, an output frequency signal of the satellite-borne atomic clock is a time frequency reference of the whole satellite, and the performance of the satellite-borne atomic clock directly influences the navigation, positioning and time service precision of the satellite. The satellite-borne atomic clocks of the GNSS navigation systems adopt a working mode that a main clock and a hot standby clock are mutually backed up, and satellites can be automatically switched to the standby clocks when the main clock fails. The output frequencies of different atomic clocks have different time-varying characteristics, so that a ground operation and control system is required to continuously monitor and evaluate the performance of an output signal of a satellite-borne atomic clock by taking the ground atomic clock as a reference, and periodically inject satellite clock error parameters to realize satellite-ground time synchronization.
At present, the ground operation and control center of each GNSS navigation system adopts a two-way method to evaluate the performance of a satellite-borne atomic clock, as shown in fig. 1, the specific steps are as follows:
the method comprises the steps that firstly, a ground operation and control system transmits an uplink signal, a satellite captures the ground uplink signal, an uplink ranging link is established, meanwhile, the satellite transmits a downlink signal, the ground operation and control system captures the downlink signal, a downlink ranging link is established, and an uplink pseudo range value rho u and a downlink pseudo range value rho d of the satellite are measured;
and step two, the uplink pseudo range value rho is transmitted back to the ground through remote measurement, and the ground operation and control system synthesizes the downlink pseudo range value rho d and the uplink pseudo range value rho to calculate and obtain a clock difference tau main of the satellite-borne main clock relative to the ground reference clock in the sampling period as (rho-rho d)/2.
And step three, repeating the step one and the step two, continuously sampling in a period of time to obtain a group of clock error data tau 1 master, tau 2 master, tau 3 master and … … tau n master, and counting to obtain performance parameters such as stability, accuracy, drift rate and the like of the satellite-borne atomic clock C1 relative to the ground reference clock.
And step four, switching the satellite-borne main clock to the hot standby clock C2, and repeating the step one to the step three to obtain performance parameters such as stability, accuracy and drift rate of the satellite-borne hot standby atomic clock C2 relative to the ground reference clock.
And in the normal operation process of the navigation satellite, the time-frequency signal is required to be kept to continuously operate for a long time, the non-fault switching of the main clock and the standby clock is avoided, and the continuous use of the main clock is damaged in the step four, so that the normal use of the time-frequency signal of the navigation satellite is influenced.
When the performance of the satellite-borne hot standby atomic clock is evaluated, as shown in fig. 1, the satellite-borne main clock needs to be switched to the hot standby clock in the fourth step, and the main clock needs to be switched back to the hot standby clock when the main clock is evaluated, so that the operation is complex, and the continuity of satellite time-frequency signals is damaged. The method can not realize continuous monitoring and performance evaluation of the signals of the main and standby clocks, so that the performance indexes of the main and standby clocks in the long-term operation process are not controlled. Finally, the use of the user is influenced, and the satellite navigation positioning performance is reduced.
Disclosure of Invention
The invention aims to provide a performance evaluation method of a satellite-borne atomic clock, which aims to solve the problem that the continuity of satellite time-frequency signals is damaged by the existing performance evaluation method of the satellite-borne atomic clock.
In order to solve the technical problem, the invention provides a performance evaluation method of a satellite-borne atomic clock, which comprises the following steps:
the method comprises the steps that firstly, a satellite-borne atomic clock comprises a main clock and a hot standby clock, a ground operation and control system which takes the ground reference atomic clock as a reference transmits an uplink signal, an uplink ranging link is established with a satellite, the satellite takes the main clock of the satellite-borne atomic clock as the reference, simultaneously, the satellite transmits a downlink signal, a downlink ranging link is established with the ground operation and control system, the satellite measures an uplink pseudo range value between the satellite and the ground, and the ground operation and control system measures a downlink pseudo range value between the satellite and the ground;
secondly, a satellite time-frequency processing system measures and records the clock error of the hot standby clock relative to the main clock in real time;
thirdly, the uplink pseudo range value is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system calculates the clock error of the main clock relative to the ground reference atomic clock in the sampling period according to the downlink pseudo range value and the uplink pseudo range value;
fourthly, the clock difference of the standby clock relative to the main clock is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system obtains the clock difference of the standby clock relative to the ground reference atomic clock according to the clock difference of the main clock relative to the ground reference atomic clock and the clock difference of the standby clock relative to the main clock;
and fifthly, repeating the first step to the fourth step, continuously sampling in a period of time to obtain a group of clock differences of the main clock relative to the ground reference atomic clock and another group of clock differences of the hot standby clock relative to the ground reference atomic clock, calculating the stability, accuracy and drift rate of the main clock relative to the ground reference atomic clock, and calculating the stability, accuracy and drift rate of the hot standby clock relative to the ground reference atomic clock.
Optionally, in the method for evaluating performance of a satellite-borne atomic clock, an uplink pseudorange value between the satellite and the ground measured by the satellite in the step one is a sum of a microwave propagation delay between the satellite and the ground and a clock difference of the main clock relative to a ground reference atomic clock;
the ground operation and control system in the first step measures a downlink pseudo range value between the satellite and the ground as the difference between the microwave propagation delay between the satellite and the ground and the clock difference of the main clock relative to the ground reference atomic clock;
and for the uplink pseudo range value measured in the same sampling period, the satellite-ground microwave propagation delay contained in the uplink pseudo range value is equal to the satellite-ground microwave propagation delay contained in the downlink pseudo range value.
Optionally, in the method for evaluating performance of a satellite-borne atomic clock, the clock difference of the hot standby clock relative to the main clock, which is measured and recorded in real time by the satellite time-frequency processing system in the second step, is a difference between a phase of an output signal of the hot standby clock and a phase of an output signal of the main clock;
and measuring the phase difference between the output signal of the hot standby clock and the output signal of the main clock by using a phase discriminator of a satellite-borne time-frequency processing system, wherein the phase difference is the clock difference of the hot standby clock relative to the main clock.
Optionally, in the method for evaluating performance of a satellite-borne atomic clock, the uplink pseudorange value in the third step and the uplink pseudorange value in the fourth step and the clock difference of the hot standby clock with respect to the main clock are both downloaded to the ground in real time through a satellite-ground measurement and control channel, and are collected to the ground operation and control system, and data differential processing is performed to obtain the clock difference of the main clock with respect to the ground reference atomic clock and the clock difference of the hot standby clock with respect to the ground reference atomic clock.
In the method for evaluating the performance of the satellite-borne atomic clock, the satellite-borne atomic clock comprises a main clock and a hot standby clock, an uplink pseudo range value between the satellite and the earth is measured through a satellite, a downlink pseudo range value between the satellite and the earth is measured through a ground operation and control system, the clock difference of the hot standby clock relative to the main clock is measured and recorded in real time through the satellite time-frequency processing system, the uplink pseudo range value is transmitted back to the ground operation and control system through remote measurement, the ground operation and control system calculates the clock difference of the main clock relative to a ground reference atomic clock in a sampling period according to the downlink pseudo range value and the uplink pseudo range value, the ground operation and control system obtains the clock difference of the hot standby clock relative to the ground reference atomic clock according to the clock difference of the main clock relative to the ground reference atomic clock and overcomes the problem of switching atomic clocks back and forth when the performance of the navigation satellite-borne main and standby clocks (the main clock and the hot standby clock; and repeating the first step to the fourth step, continuously sampling in a period of time to obtain a clock difference of one group of main clocks relative to the ground reference atomic clock and a clock difference of the other group of hot spare clocks relative to the ground reference atomic clock, calculating to obtain the stability, accuracy and drift rate of the main clocks relative to the ground reference atomic clock, and calculating the stability, accuracy and drift rate of the hot spare clocks relative to the ground reference atomic clock. Finally, user experience is improved, and satellite navigation positioning performance is improved.
Drawings
FIG. 1 is a schematic diagram of a principle of a conventional method for evaluating the performance of a satellite-borne atomic clock;
FIG. 2 is a schematic diagram illustrating a principle of a method for evaluating performance of a satellite-borne atomic clock according to an embodiment of the present invention.
Detailed Description
The method for evaluating the performance of the spaceborne atomic clock provided by the invention is further described in detail by combining the attached drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a performance evaluation method of a satellite-borne atomic clock, so as to solve the problem that the continuity of satellite time-frequency signals is damaged by the existing performance evaluation method of the satellite-borne atomic clock.
In order to realize the idea, the invention provides a performance evaluation method of a satellite-borne atomic clock, which comprises the following steps: the method comprises the steps that firstly, a satellite-borne atomic clock comprises a main clock and a hot standby clock, a ground operation and control system which takes the ground reference atomic clock as a reference transmits an uplink signal, an uplink ranging link is established with a satellite, the satellite takes the main clock of the satellite-borne atomic clock as the reference, simultaneously, the satellite transmits a downlink signal, a downlink ranging link is established with the ground operation and control system, the satellite measures an uplink pseudo range value between the satellite and the ground, and the ground operation and control system measures a downlink pseudo range value between the satellite and the ground; secondly, a satellite time-frequency processing system measures and records the clock error of the hot standby clock relative to the main clock in real time; thirdly, the uplink pseudo range value is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system calculates the clock error of the main clock relative to the ground reference atomic clock in the sampling period according to the downlink pseudo range value and the uplink pseudo range value; fourthly, the clock difference of the standby clock relative to the main clock is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system obtains the clock difference of the standby clock relative to the ground reference atomic clock according to the clock difference of the main clock relative to the ground reference atomic clock and the clock difference of the standby clock relative to the main clock; and fifthly, repeating the first step to the fourth step, continuously sampling in a period of time to obtain a group of clock differences of the main clock relative to the ground reference atomic clock and another group of clock differences of the hot standby clock relative to the ground reference atomic clock, calculating the stability, accuracy and drift rate of the main clock relative to the ground reference atomic clock, and calculating the stability, accuracy and drift rate of the hot standby clock relative to the ground reference atomic clock.
< example one >
This embodiment provides a method for evaluating performance of a satellite-borne atomic clock, as shown in FIG. 2The method for evaluating the performance of the satellite-borne atomic clock comprises the following steps: the method comprises the steps that firstly, a satellite-borne atomic clock comprises a main clock and a hot standby clock, a ground operation and control system taking the ground reference atomic clock as a reference transmits an uplink signal, an uplink ranging link is established with a satellite, the satellite takes the main clock of the satellite-borne atomic clock as the reference, simultaneously, the satellite transmits a downlink signal, a downlink ranging link is established with the ground operation and control system, and the satellite measures an uplink pseudo range value rho between the satellite and the grounduThe ground operation and control system measures downlink pseudo range value rho between satellites and the groundd(ii) a Step two, the satellite time frequency processing system measures and records the clock difference tau of the hot standby clock relative to the main clock in real timeBackup-main(ii) a Step three, the uplink pseudo range value rhouThe pseudo range value is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system transmits the pseudo range value to the ground operation and control system according to the downlink pseudo range value rhodAnd the uplink pseudo-range value rhouCalculating to obtain the clock difference tau of the main clock relative to the ground reference atomic clock in the sampling periodMaster and slave＝(ρu-ρd) 2; fourthly, the clock difference of the hot standby clock relative to the main clock is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system transmits the clock difference to the ground reference atomic clock according to the clock difference tau of the main clock relative to the ground reference atomic clockMaster and slaveClock difference tau of said hot standby clock relative to said main clockBackup-mainObtaining the clock difference tau of the hot standby clock relative to the ground reference atomic clockPrepare for＝τBackup-main+τMaster and slave(ii) a Step five, repeating the step one to the step four, and continuously sampling in a period of time to obtain a group of clock differences of the main clock relative to the ground reference atomic clock and another group of clock differences of the hot standby clock relative to the ground reference atomic clock, such as tau1 Master and slave，τ2 Master and slave，τ3 Master and slave，……τn Master and slaveAnd τ1 Prepare for，τ2 Prepare for，τ3 Prepare for，……τn Prepare forAnd calculating the stability, accuracy and drift rate of the main clock relative to the ground reference atomic clock, and calculating the stability, accuracy and drift rate of the hot standby clock relative to the ground reference atomic clock.
Specifically, in the method for evaluating performance of an atomic clock onboard a satellite, the satellite in the step one measures an uplink pseudorange value ρ between the satellite and the grounduFor the microwave propagation delay between the satellite and the earth rhoLClock difference rho of the main clock relative to the ground reference atomic clockMaster and slaveSum, i.e. pu＝ρMaster and slave+ρL(ii) a The ground operation and control system in the step one measures a downlink pseudo range value rho between satellites and the grounddFor the microwave propagation delay rho between the satellite and the groundLClock difference rho of the main clock relative to the ground reference atomic clockMaster and slaveThe difference, i.e. pd＝-ρMaster and slave+ρL(ii) a For the uplink pseudo range value rho measured in the same sampling perioduThe satellite-ground microwave propagation delay and the downlink pseudo-range value rho contained in the pseudo-rangedThe satellite-ground microwave propagation delays contained therein are equal.
Further, in the method for evaluating performance of a satellite-borne atomic clock, in the second step, the satellite time-frequency processing system measures and records the clock difference τ of the hot standby clock relative to the main clock in real timeBackup-mainPhase p of output signal for hot standby clockPrepare forPhase p of the output signal of the main clockMaster and slaveThe difference of, i.e.. tauBackup-main＝ρPrepare for-ρMaster and slave(ii) a And measuring the phase difference between the output signal of the hot standby clock and the output signal of the main clock by using a phase discriminator of a satellite-borne time-frequency processing system, wherein the phase difference is the clock difference of the hot standby clock relative to the main clock.
In addition, in the method for evaluating performance of atomic clock on satellite, the uplink pseudorange values ρ in the third step and the fourth stepuAnd the clock difference tau of the hot standby clock relative to the main clockBackup-mainAll the data are downloaded to the ground in real time through a satellite-ground measurement and control channel and collected to the ground operation and control system, and data differential processing is carried out to obtain the clock difference tau of the main clock relative to the ground reference atomic clockMaster and slaveAnd the clock difference tau of the hot standby clock relative to the ground reference atomic clockPrepare for。
In the method for evaluating the performance of the satellite-borne atomic clock provided by this embodiment, the satellite-borne atomic clock includes a main clock and a hot standby clock, an uplink pseudo range value between the satellite and the earth is measured by a satellite, a downlink pseudo range value between the satellite and the earth is measured by a ground operation and control system, a clock difference of the hot standby clock relative to the main clock is measured and recorded in real time by the satellite time-frequency processing system, the uplink pseudo range value is transmitted back to the ground operation and control system by telemetry, the ground operation and control system calculates a clock difference of the main clock relative to a ground reference atomic clock in a sampling period according to the downlink pseudo range value and the uplink pseudo range value, the ground operation and control system obtains a clock difference of the hot standby clock relative to the ground reference atomic clock according to the clock difference of the main clock relative to the ground reference atomic clock and the clock difference of the hot standby clock relative to the main clock, thereby overcoming the problem of switching atomic clocks during performance evaluation of the navigation satellite-borne main and standby clocks (main, the method comprises the steps of continuously sampling within a period of time to obtain the clock difference of one group of main clocks relative to a ground reference atomic clock and the clock difference of the other group of hot standby clocks relative to the ground reference atomic clock, calculating the stability, the accuracy and the drift rate of the main clocks relative to the ground reference atomic clock, and calculating the stability, the accuracy and the drift rate of the hot standby clocks relative to the ground reference atomic clock. Finally, user experience is improved, and satellite navigation positioning performance is improved.
In summary, the above embodiments describe the details of the different schemes of the method for evaluating the performance of the atomic clock on the satellite in detail, and it goes without saying that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications based on the configurations provided by the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (4)
1. A performance evaluation method of a spaceborne atomic clock is characterized by comprising the following steps:
the method comprises the steps that firstly, a satellite-borne atomic clock comprises a main clock and a hot standby clock, a ground operation and control system which takes the ground reference atomic clock as a reference transmits an uplink signal, an uplink ranging link is established with a satellite, the satellite takes the main clock of the satellite-borne atomic clock as the reference, simultaneously, the satellite transmits a downlink signal, a downlink ranging link is established with the ground operation and control system, the satellite measures an uplink pseudo range value between the satellite and the ground, and the ground operation and control system measures a downlink pseudo range value between the satellite and the ground;
the uplink pseudo range value between the satellite and the ground measured by the satellite in the step one is the sum of the microwave propagation delay between the satellite and the ground and the clock difference of the main clock relative to the ground reference atomic clock;
the ground operation and control system in the first step measures a downlink pseudo range value between the satellite and the ground as the difference between the microwave propagation delay between the satellite and the ground and the clock difference of the main clock relative to the ground reference atomic clock;
secondly, a satellite time-frequency processing system measures and records the clock error of the hot standby clock relative to the main clock in real time;
thirdly, the uplink pseudo range value is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system calculates the clock error of the main clock relative to the ground reference atomic clock in the sampling period according to the downlink pseudo range value and the uplink pseudo range value;
fourthly, the clock difference of the standby clock relative to the main clock is transmitted back to the ground operation and control system through remote measurement, and the ground operation and control system obtains the clock difference of the standby clock relative to the ground reference atomic clock according to the clock difference of the main clock relative to the ground reference atomic clock and the clock difference of the standby clock relative to the main clock;
and fifthly, repeating the first step to the fourth step, continuously sampling in a period of time to obtain a group of clock differences of the main clock relative to the ground reference atomic clock and another group of clock differences of the hot standby clock relative to the ground reference atomic clock, calculating the stability, accuracy and drift rate of the main clock relative to the ground reference atomic clock, and calculating the stability, accuracy and drift rate of the hot standby clock relative to the ground reference atomic clock.
2. The method for evaluating the performance of an atomic clock on board a satellite according to claim 1,
and for the uplink pseudo range value measured in the same sampling period, the satellite-ground microwave propagation delay contained in the uplink pseudo range value is equal to the satellite-ground microwave propagation delay contained in the downlink pseudo range value.
3. The method for evaluating performance of an atomic clock on a satellite according to claim 1, wherein the clock difference of the hot standby clock relative to the main clock, which is measured and recorded in real time by the satellite time-frequency processing system in the second step, is the difference between the phase of the output signal of the hot standby clock and the phase of the output signal of the main clock;
and measuring the phase difference between the output signal of the hot standby clock and the output signal of the main clock by using a phase discriminator of a satellite-borne time-frequency processing system, wherein the phase difference is the clock difference of the hot standby clock relative to the main clock.
4. The method for evaluating performance of an atomic clock on a satellite according to claim 1, wherein the uplink pseudo range value in the third step and the fourth step and the clock difference of the standby clock with respect to the main clock are both downloaded to the ground in real time through a satellite-ground measurement and control channel, and are collected to the ground operation and control system, and data differential processing is performed to obtain the clock difference of the main clock with respect to the ground reference atomic clock and the clock difference of the standby clock with respect to the ground reference atomic clock.
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| CN103185889A (en) * | 2011-12-31 | 2013-07-03 | 上海航天测控通信研究所 | Generating system of high-stable time and frequency |
| CN102590825B (en) * | 2012-02-17 | 2013-06-19 | 北京空间飞行器总体设计部 | Seamless switching method for master and slave satellite clocks of navigation satellite |
| US9484980B1 (en) * | 2012-12-03 | 2016-11-01 | Sprint Communications Company L.P. | Precision timing source back-up for loss of GPS satellites |
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