CN105589328B - Time synchronization test method, measuring accuracy determine method and device - Google Patents

Abstract

The invention discloses a kind of time synchronization test methods, including：Before the unlocked satellite time transfer module of local clock, using satellite time transfer signal as reference signal；According to the satellite time transfer signal and measured signal, the time precision of presently described measured signal is determined.The present invention also discloses a kind of time synchronization test precision to determine method, time synchronization test device and time synchronization test precision determining device.

Description

Time synchronization test method, test accuracy determination method and device

technical field

The invention relates to testing technology, in particular to a time synchronization testing method, a testing precision determination method and a device.

Background technique

Unified and precise time has demands and applications in fields such as mobile communications, electric power, finance, and sensing. To ensure the accuracy of time information, the time information must be tested by a high-precision test system.

There are many types of traditional time synchronization test equipment, and the test accuracy and performance are also different. Usually adopt the technology of GPS (Global Positioning System) satellite clock source or Beidou satellite navigation system (BD) to synchronize the local clock (such as crystal oscillator, rubidium clock, etc.), by receiving satellite signals, use the satellite clock to tame the local clock and then output Pulse signal, the time test accuracy is obtained by comparing the measured signal with the output pulse signal.

However, this method has certain defects: when measuring, the satellite timing module first completes the start-up satellite search and then completes its own 3D positioning and then enters the precise timing mode, while the local clocks such as rubidium clocks need to complete preheating and wait for their own frequency to stabilize before locking To the 1PPS signal output by the satellite timing module, the locking process takes about 40 minutes to 1 hour, and the locking time is too long. As a result, during the use of the meter, engineers need to wait at the test site until the meter is locked before starting measurement.

Contents of the invention

In order to solve the existing technical problems, the embodiment of the present invention provides a time synchronization test method, a test accuracy determination method and a device.

An embodiment of the present invention provides a time synchronization testing method, including:

Before the local clock is locked to the satellite timing module, the satellite timing signal is used as the reference signal;

According to the satellite timing signal and the measured signal, the time accuracy of the currently measured signal is determined.

In the above scheme, when determining the time accuracy of the current measured signal according to the satellite timing signal and the measured signal, the method further includes:

Comparing the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

According to the phase deviation sequence, the test accuracy of the current system is determined.

In the above solution, the determination of the test accuracy of the current system according to the phase deviation sequence is:

Using a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

Using the phase deviation sequence and the frequency drift rate, determine the mean square error of the error between the satellite timing signal and the standard time and the peak value of the error peak.

In the above scheme, the method also includes:

Save the frequency drift rate.

In the above scheme, the method also includes:

Output the determined test accuracy.

In the above scheme, the method also includes:

After the local clock locks the satellite timing module, use the local clock locked and optimized signal as a reference signal;

Correspondingly, according to the optimized signal locked by the local clock and the signal under test, the current time accuracy of the signal under test is determined.

The embodiment of the present invention also provides a time synchronization test accuracy determination method, including:

Comparing the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

According to the phase deviation sequence, the test accuracy of the current system is determined.

In the above solution, the determination of the test accuracy of the current system according to the phase deviation sequence is:

Using a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

Using the phase deviation sequence and the frequency drift rate, determine the mean square error of the error between the satellite timing signal and the standard time and the peak value of the error peak.

In the above scheme, the method also includes:

Save the frequency drift rate.

In the above scheme, the method also includes:

Output the determined test accuracy.

The embodiment of the present invention further provides a time synchronization test device, including: a selection unit and a test unit; wherein,

The selection unit is used to use the satellite timing signal as a reference signal before the local clock is not locked to the satellite timing module;

The testing unit is configured to determine the current time accuracy of the signal under test according to the satellite timing signal and the signal under test.

In the above solution, the device further includes: a comparison unit and a test accuracy determination unit; wherein,

The comparison unit is used to compare the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

The test accuracy determining unit is configured to determine the test accuracy of the current system according to the phase deviation sequence.

In the above solution, the test accuracy determination unit further includes: a first determination module and a second determination module; wherein,

The first determining module is configured to use a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

The second determination module is configured to determine the mean square error and the peak value of the error peak between the satellite timing signal and standard time by using the phase deviation sequence and the frequency drift rate.

In the solution above, the device further includes: a storage unit configured to store the frequency drift rate.

In the solution above, the device further includes: an output unit configured to output the determined test accuracy after determining the test accuracy of the current system.

In the above scheme, the selection unit is further configured to use the signal locked by the local clock and optimized after the local clock is locked to the satellite timing module as a reference signal;

Correspondingly, the testing unit is further configured to determine the current time accuracy of the signal under test according to the optimized signal locked by the local clock and the signal under test.

The embodiment of the present invention also provides a time synchronization test accuracy determination device, including: a comparison unit and a test accuracy determination unit; wherein,

The comparison unit is used to compare the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

The test accuracy determining unit is configured to determine the test accuracy of the current system according to the phase deviation sequence.

In the above solution, the test accuracy determination unit further includes: a first determination module and a second determination module; wherein,

The first determining module is configured to use a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

The second determination module is configured to determine the mean square error and the peak value of the error peak between the satellite timing signal and standard time by using the phase deviation sequence and the frequency drift rate.

In the solution above, the device further includes: a storage unit configured to store the frequency drift rate.

In the solution above, the device further includes: an output unit configured to output the determined test accuracy after determining the test accuracy of the current system.

In the time synchronization test method, test accuracy determination method and device provided by the embodiments of the present invention, before the local clock is locked to the satellite timing module, the satellite timing signal is used as a reference signal; according to the satellite timing signal and the measured signal, the current The time accuracy of the signal under test, so that the test equipment can start the test without waiting for the local clock to be locked, which greatly shortens the start-up time of the test and can quickly provide testers with time accuracy test results.

In addition, after the frequency drift rate of the local clock is determined by using the phase deviation sequence, the frequency drift rate is saved. In the next test, the stored frequency drift rate can be directly called to directly determine the frequency drift rate of the current system. The test accuracy, in this way, can effectively reduce the number of sampling phase deviations required to estimate the test accuracy next time, further reduce the test time, and can quickly provide testers with instrument accuracy information.

Description of drawings

In the drawings (which are not necessarily drawn to scale), like reference numerals may describe like parts in different views. Similar reference numbers with different letter suffixes may indicate different instances of similar components. The drawings generally illustrate the various embodiments discussed herein, by way of example and not limitation.

1 is a schematic flow chart of a time synchronization testing method according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a time synchronization testing device according to Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a time synchronization testing device according to Embodiment 3 of the present invention;

FIG. 4 is a schematic flow chart of a method for determining the accuracy of a time synchronization test in Embodiment 4 of the present invention;

FIG. 5 is a schematic structural diagram of a time synchronization test accuracy determination device according to Embodiment 5 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

It can be seen from the description of the background technology that in the existing time synchronization test system, before the local clock is not locked to the satellite timing module, engineers need to wait at the test site until the instrument is locked before starting measurement.

In addition, the traditional time synchronization test equipment cannot give the test accuracy range while testing, which brings inconvenience to the testers;

In addition, the central processing unit (CPU, Central Processing Unit) of the test equipment does not store each error value, and each error value must be recalculated and adjusted every time, which increases the test time.

Based on this, in various embodiments of the present invention: before the local clock is not locked to the satellite timing module, the satellite timing signal is used as a reference signal; according to the satellite timing signal and the measured signal, determine the current measured signal time precision.

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment one

The time synchronization testing method of this embodiment, as shown in Figure 1, comprises the following steps:

Step 101: Before the local clock is locked to the satellite timing module, the satellite timing signal is used as a reference signal;

Here, the satellite timing signal refers to a signal output by a satellite timing module, and the satellite timing signal includes: a 1PPS signal and a current time (TOD) signal.

In practical applications, the satellite timing signal is generally filtered first, and the filtered satellite timing signal is used as a reference signal.

The local clock may be a crystal oscillator, or a rubidium clock or the like.

Step 102: Determine the current time accuracy of the signal under test according to the satellite timing signal and the signal under test.

Here, when determining the time accuracy of the current measured signal according to the satellite timing signal and the measured signal, the method may also include: comparing the phase of the local clock signal with the satellite timing signal in real time to obtain the phase A deviation sequence; according to the phase deviation sequence, determine the test accuracy of the current system.

Wherein, the test accuracy of the current system is determined according to the phase deviation sequence, specifically:

Using a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

Using the phase deviation sequence and the frequency drift rate, determine the mean square error of the error between the satellite timing signal and the standard time and the peak value of the error peak.

Here, the frequency drift rate can also be saved, and the stored frequency drift rate can be directly recalled during the next test to directly determine the test accuracy of the current system. In this way, the sampling required for the next estimation test accuracy is reduced. The amount of phase deviation.

After determining the test accuracy of the current system, the method may also include: outputting the determined test accuracy; in this way, the displayed test accuracy is for the tester's reference; when the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy, he can select Wait for a period of time until the test accuracy meets the current test requirements before starting the test.

The method can also include:

After the local clock locks the satellite timing module, use the local clock locked and optimized signal as a reference signal;

Correspondingly, according to the signal locked by the local clock after optimization and the signal under test, determine the time accuracy of the current signal under test, so that the test accuracy can be improved, and when the satellite timing signal is lost, stable performance and punctuality.

Here, in practical application, the optimization processing includes performing frequency deviation correction processing on the local clock signal and the like.

In the time synchronization test method provided by the embodiment of the present invention, before the local clock is locked to the satellite timing module, the satellite timing signal is used as a reference signal; according to the satellite timing signal and the measured signal, the time accuracy of the current measured signal is determined, In this way, the test equipment can start the test without waiting for the local clock to be locked, which greatly shortens the start-up time of the test, and can quickly provide the tester with the time accuracy test result.

According to the satellite timing signal and the measured signal, when determining the time accuracy of the current measured signal, the local clock signal is compared with the satellite timing signal in real time to obtain a phase deviation sequence; according to the phase deviation sequence, Determine the test accuracy of the current system and output the determined test accuracy; in this way, when the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy, he can choose to wait for a period of time until the test accuracy meets the current test requirements. Start testing.

After the frequency drift rate of the local clock is determined by using the phase deviation sequence, the frequency drift rate is saved. In the next test, the stored frequency drift rate can be directly called to directly determine the test accuracy of the current system. , and the frequency drift rate is determined based on the sampling data within a certain period of time, which can effectively reduce the number of sampling phase deviations required to estimate the test accuracy next time, further reduce the test time, and quickly provide testers with instrument accuracy information.

Embodiment two

In order to implement the method of Embodiment 1, this embodiment provides a time synchronization testing device, as shown in FIG. 2 , the device includes: a selection unit 21 and a testing unit 22; wherein,

The selection unit 21 is used to use the satellite timing signal as a reference signal before the local clock is not locked to the satellite timing module;

The testing unit 22 is configured to determine the current time accuracy of the signal under test according to the satellite timing signal and the signal under test.

Wherein, the satellite timing signal refers to the signal output by the satellite timing module, and the satellite timing signal includes: 1PPS signal and TOD signal.

In practical applications, the satellite timing signal is generally filtered first, and the filtered satellite timing signal is used as a reference signal.

The local clock may be a crystal oscillator, or a rubidium clock or the like.

The device may also include: a comparison unit and a test accuracy determination unit; wherein,

The comparison unit is used to compare the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

The test accuracy determining unit is configured to determine the test accuracy of the current system according to the phase deviation sequence.

Here, the test accuracy determination unit may also include: a first determination module and a second determination module; wherein,

The first determining module is configured to use a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

The second determination module is configured to determine the mean square error and the peak value of the error peak between the satellite timing signal and standard time by using the phase deviation sequence and the frequency drift rate.

Wherein, the device may also include: a storage unit, which is used to store the frequency drift rate. In the next test, the stored frequency drift rate can be directly retrieved to directly determine the test accuracy of the current system. In this way, the The amount of sample phase offset required for the next estimate of test accuracy.

The device may also include: an output unit, which is used to output the determined test accuracy after determining the test accuracy of the current system; in this way, the displayed test accuracy is for the tester's reference; the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy. When required, you can choose to wait for a period of time, and start the test after the test accuracy meets the current test requirements.

The selection unit 21 is further configured to use the local clock locked and optimized signal as a reference signal after the local clock locks the satellite timing module;

Correspondingly, the test unit 22 is also used to determine the time accuracy of the current signal under test according to the optimized signal locked by the local clock and the signal under test, so that the test accuracy can be improved, and in When the satellite timing signal is lost, it can provide stability and punctuality.

Here, in practical application, the optimization processing includes performing frequency deviation correction processing on the local clock signal and the like.

In actual application, the selection unit 21, the test unit 22, the comparison unit, the test accuracy determination unit, the first determination module, and the second determination module can be controlled by the central Processor (CPU, Central Processing Unit), digital signal processor (DSP, Digital Signal Processor) or programmable logic array (FPGA, Field-Programmable Gate Array) realize; Described storage unit can be realized by the memory in the time synchronization testing device ; The output unit can be realized by a display in the synchronous testing device.

In the time synchronization test device provided by the embodiment of the present invention, before the local clock is not locked to the satellite timing module, the selection unit 21 uses the satellite timing signal as a reference signal; the test unit 22 determines according to the satellite timing signal and the measured signal The time accuracy of the signal under test is currently described. In this way, the test equipment can start the test without waiting for the local clock to be locked, which greatly shortens the start-up time of the test and can quickly provide testers with time accuracy test results.

According to the satellite timing signal and the signal under test, when determining the time accuracy of the current signal under test, the comparison unit compares the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence; the test The accuracy determination unit determines the test accuracy of the current system according to the phase deviation sequence, and the output unit outputs the determined test accuracy; in this way, when the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy, he can choose to wait After a period of time, wait for the test accuracy to meet the current test requirements before starting the test.

After the frequency drift rate of the local clock is determined by using the phase deviation sequence, the storage unit stores the frequency drift rate. In the next test, the stored frequency drift rate can be directly called to directly determine the current system frequency drift rate. test accuracy, and the frequency drift rate is determined based on the sampling data within a certain period of time, so that it can effectively reduce the number of sampling phase deviations required to estimate the test accuracy next time, further reduce the test time, and quickly provide testers with Instrument accuracy information.

Embodiment three

When this embodiment is used in practice, the composition of the time synchronization test device is shown in Figure 3, including: a data processing unit, a selection unit, a test unit, a display unit, a comparison unit, a central processing unit, a frequency multiplication unit and a counting unit.

The processing procedure of the time synchronization testing device will be described in detail below in conjunction with FIG. 3 .

During the test, the satellite timing module first starts to search for satellites, and enters the precise timing mode (about 1 minute) after completing its own 3D positioning. The data processing unit performs filtering processing on the signal output by the satellite timing module, and outputs 1PPS signal and TOD signal; , the signal is divided into two outputs, one signal enters the test unit through the selection unit, and the other signal enters the comparison module; the signals of the two outputs are exactly the same, and both include 1PPS signal and TOD signal;

The selection unit is used to select the reference signal used in the test system test; specifically, before the local clock is not locked, the 1PPS signal and the TOD signal output by the timing satellite module are first selected as the reference signal used in the test, that is, the selection unit will satellite timing The signal is used as a reference signal, and is output to the test unit, and the test unit compares the satellite timing signal with the measured signal, determines the time accuracy of the currently described measured signal, and displays it on the display unit (equivalent to the output unit in the second embodiment) The time accuracy of the signal under test is given; in this way, the device can start the test without waiting for the lock of the local clock and the calculation of the central processing unit, which greatly shortens the start-up time of the test and can quickly provide the tester with the test Time accuracy information of signals and satellite timing signals;

When the local clock (such as crystal oscillator, rubidium clock, etc.) completes the preheating to achieve its own frequency stability, and locks to the satellite timing module, the selection unit automatically switches to using the signal after local clock locking and central processing unit optimization processing as the reference signal; In practical applications, the unit can be selected to automatically output from the receiving processing unit when the local clock completes the warm-up and waits to achieve its own frequency stability and locks to the switching conditions corresponding to the satellite timing module (such as the power-on time of the test instrument reaches the preset value, etc.) The satellite timing signal is switched to receive the signal output by the central processing unit; correspondingly, the test unit compares the signal processed by the central processing unit with the measured signal, determines the time accuracy of the currently measured signal, and displays it on the display unit (equivalent to the output unit in the second embodiment) provides the time accuracy of the currently measured signal; in this way, the test accuracy can be improved, and stability and punctuality can be provided when the satellite timing signal is lost.

Wherein, when comparing the satellite timing signal with the measured signal to determine the time accuracy of the current measured signal, the comparison unit compares the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence; The central processing unit (equivalent to the test precision determination unit in the second embodiment) determines the test precision of the current system according to the phase deviation sequence.

Here, under normal working conditions, the error of the satellite timing module clock obeys the normal distribution; while the local clock will cause frequency drift due to the function of the frequency output components and environmental factors, which is caused by the aging effect of the internal components of the frequency source A unidirectional change in the average frequency, characteristic of a systematic error. Therefore, the central processing unit can estimate the error of the two, thereby giving the peak value of the waveform fluctuation peak of the reference signal (that is, the peak value in the following formula (3)), and at the same time correct or calibrate the accuracy of the reference signal generated by the local clock according to the error estimate. Spend.

The central processing unit uses a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence; and uses the phase deviation sequence and the frequency drift rate to determine the error rate between the satellite timing signal and standard time The mean square error and the peak value of the error peak.

Here, using a formula to express the mean square error of determining the frequency drift rate and determining the error between the satellite timing signal and the standard time and the peak value of the error peak, then there are:

Suppose k is the frequency drift rate of the local clock; p _i is the relative phase of the frequency measured at time t _i ; t _i is the time when the relative phase is measured, that is, the sampling timing; then:

Then the frequency drift rate of the local clock is estimated by formula (1):

After estimating the frequency drift rate of the local clock, formula (2) is used to estimate the mean square error of the error between the satellite timing signal and the standard time:

in, x is the counting time corresponding to the first sample;

Correspondingly, adopt formula (3) to estimate the peak value of error peak between described satellite timing signal and standard time:

V _pp ＝max(p _i -kx-b)-min(p _i -kx-b) (3)

i=1,2,...,n

Among them, max() represents the maximum value in the sampling sequence, and min() represents the minimum value in the sampling sequence.

The central processing unit will estimate the mean square error of the error between the satellite timing signal and the standard time and the peak value V _pp of the error peak are sent to the display unit (equivalent to the output unit in Embodiment 2) for display, for the reference of test personnel. As the sampling phase deviation increases with time, the mean square error and the peak value V _pp of the error peak can be updated in real time, if the test accuracy estimate (ie and V _pp ) cannot meet the current test requirements, the tester can choose to wait for a period of time, and start the test after the estimated test accuracy value meets the current test requirements.

At the same time, the frequency drift rate k of the local clock calculated in this test can be stored in the central processing unit, so that in the next test, the stored frequency drift rate k can be directly retrieved and directly calculated and V _pp , and the frequency drift rate is determined based on the sampling data within a certain period of time, thus reducing the number of sampling phase deviations needed to estimate the test accuracy next time, and further shortening the test time.

Among them, the frequency multiplication unit is mainly used to determine whether the frequency required by the local clock and the comparison unit are different; the technical unit is mainly used to count the frequency information based on the local clock to obtain time information, which can be used for the instrument to continue to obtain when the satellite source is lost Time service.

Embodiment four

The method for determining the accuracy of the time synchronization test in this embodiment, as shown in Figure 4, includes the following steps:

Step 401: comparing the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

Step 402: Determine the test accuracy of the current system according to the phase deviation sequence.

Specifically, using a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

Using the phase deviation sequence and the frequency drift rate, determine the mean square error of the error between the satellite timing signal and the standard time and the peak value of the error peak.

Here, the frequency drift rate can also be saved, and the stored frequency drift rate can be directly recalled during the next test to directly determine the test accuracy of the current system. In this way, the sampling required for the next estimation test accuracy is reduced. The amount of phase deviation.

After determining the test accuracy of the current system, the method may also include: outputting the determined test accuracy; in this way, the displayed test accuracy is for the tester's reference; when the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy, he can select Wait for a period of time until the test accuracy meets the current test requirements before starting the test.

The time synchronization test accuracy determination method provided by the embodiment of the present invention compares the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence; according to the phase deviation sequence, the test accuracy of the current system is determined. In this way, when When the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy, he can choose to wait for a period of time and start the test after the test accuracy meets the current test requirements.

In addition, after the frequency drift rate of the local clock is determined by using the phase deviation sequence, the frequency drift rate is saved. In the next test, the stored frequency drift rate can be directly called to directly determine the frequency drift rate of the current system. test accuracy, and the frequency drift rate is determined based on the sampling data within a certain period of time, so that it can effectively reduce the number of sampling phase deviations required to estimate the test accuracy next time, further reduce the test time, and quickly provide testers with Instrument accuracy information.

Embodiment five

In order to implement the method of Embodiment 4, this embodiment provides a time synchronization test accuracy determination device, as shown in Figure 5, the device includes: a comparison unit 51 and a test accuracy determination unit 52; wherein,

The comparison unit 51 is used to compare the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence;

The test accuracy determining unit 52 is configured to determine the test accuracy of the current system according to the phase deviation sequence.

Here, the test accuracy determination unit may also include: a first determination module and a second determination module; wherein,

The first determining module is configured to use a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence;

The second determination module is configured to determine the mean square error and the peak value of the error peak between the satellite timing signal and standard time by using the phase deviation sequence and the frequency drift rate.

Wherein, the device may also include: a storage unit, which is used to store the frequency drift rate. In the next test, the stored frequency drift rate can be directly retrieved to directly determine the test accuracy of the current system. In this way, the The amount of sample phase offset required for the next estimate of test accuracy.

The device may also include: an output unit, which is used to output the determined test accuracy after determining the test accuracy of the current system; in this way, the displayed test accuracy is for the tester's reference; the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy. When required, you can choose to wait for a period of time, and start the test after the test accuracy meets the current test requirements.

During actual application, the comparison unit, the test accuracy determination unit, the first determination module, and the second determination module can be realized by CPU, DSP or FPGA in the time synchronization test accuracy determination device; the storage unit It can be realized by a memory in the device for determining the accuracy of the time synchronization test; the output unit can be realized by a display in the device for determining the accuracy of the synchronization test.

In the time synchronization test accuracy determination device provided in this embodiment, the comparison unit 51 compares the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence; the test accuracy determination unit 52 determines the current system according to the phase deviation sequence. In this way, when the tester determines that the test accuracy cannot meet the current test requirements according to the displayed test accuracy, he can choose to wait for a period of time and start the test after the test accuracy meets the current test requirements.

In addition, after the frequency drift rate of the local clock is determined by using the phase deviation sequence, the storage unit stores the frequency drift rate. In the next test, the stored frequency drift rate can be directly recalled to directly determine the current frequency drift rate. The test accuracy of the system, and the frequency drift rate is determined based on the sampling data within a certain period of time, so that the number of sampling phase deviations required for the next estimation of the test accuracy can be effectively reduced, the test time is further reduced, and the test can be quickly Personnel provide instrument accuracy information.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (12)

1. A time synchronization testing method, characterized in that the method comprises: Before the local clock is locked to the satellite timing module, the satellite timing signal is used as the reference signal; Determining the time accuracy of the current measured signal according to the satellite timing signal and the measured signal; Wherein, the method also includes: When the local clock completes the preheating to achieve its own frequency stability and is locked to the switching conditions corresponding to the satellite timing module, switch from the satellite timing signal to the signal output by the test accuracy determination unit; According to the signal output by the test precision determining unit and the signal under test, the time precision of the current signal under test is determined. 2. method according to claim 1, is characterized in that, described according to described satellite timing signal and measured signal, when determining the time accuracy of current described measured signal, described method also comprises: Comparing the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence; According to the phase deviation sequence, the test accuracy of the current system is determined. 3. The method according to claim 2, wherein the determination of the test accuracy of the current system according to the phase deviation sequence is: Using a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence; Using the phase deviation sequence and the frequency drift rate, determine the mean square error of the error between the satellite timing signal and the standard time and the peak value of the error peak. 4. method according to claim 3, is characterized in that, described method also comprises: Save the frequency drift rate. 5. The method according to claim 2, characterized in that the method further comprises: Output the determined test accuracy. 6. The method according to claim 1, further comprising: After the local clock locks the satellite timing module, use the local clock locked and optimized signal as a reference signal; Correspondingly, according to the optimized signal locked by the local clock and the signal under test, the current time accuracy of the signal under test is determined. 7. A time synchronization test device, characterized in that the device comprises: a selection unit and a test unit; wherein, The selection unit is used for using the satellite timing signal as a reference signal before the local clock is not locked to the satellite timing module; it is also used for when the local clock completes preheating to achieve its own frequency stability, and locks to the switching condition corresponding to the satellite timing module Next, switch from the satellite timing signal to the signal output by the test accuracy determination unit; The test unit is used to determine the time accuracy of the current signal under test according to the satellite timing signal and the signal under test; it is also used to determine the current time accuracy of the signal under test according to the signal output by the test accuracy determination unit and the signal under test. The time accuracy of the signal being measured. 8. The device according to claim 7, further comprising: a comparison unit and a test accuracy determination unit; wherein, The comparison unit is used to compare the phase of the local clock signal with the satellite timing signal in real time to obtain a phase deviation sequence; The test accuracy determining unit is configured to determine the test accuracy of the current system according to the phase deviation sequence. 9. The device according to claim 8, wherein the test accuracy determination unit further comprises: a first determination module and a second determination module; wherein, The first determining module is configured to use a statistical method to determine the frequency drift rate of the local clock by using the phase deviation sequence; The second determination module is configured to determine the mean square error and the peak value of the error peak between the satellite timing signal and standard time by using the phase deviation sequence and the frequency drift rate. 10. The device according to claim 9, further comprising: a storage unit, configured to store the frequency drift rate. 11. The device according to claim 8, further comprising: an output unit, configured to output the determined test accuracy after determining the test accuracy of the current system. 12. The apparatus of claim 7, wherein: The selection unit is further configured to use the local clock locked and optimized signal as a reference signal after the local clock locks the satellite timing module; Correspondingly, the testing unit is further configured to determine the current time accuracy of the signal under test according to the optimized signal locked by the local clock and the signal under test.