Synchronous system testing method, device and synchronous testing equipment

Abstract

The present invention provides a synchronous system testing method, device and synchronous testing equipment. The method includes: obtaining a first time reference; the first time reference being the time reference of the output signal of the device under test; according to the first time reference, performing a common view comparison between the output signal and the time reference corresponding to the satellite common view server to determine the test result of the output signal. Embodiments of the present invention can not only achieve satellite common view but also select a time reference according to the output signal of the device under test, so that the time reference of the synchronous testing equipment is consistent with the time reference of the device under test, eliminating system deviation and meeting the requirements of high-precision testing at the same time.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a synchronization system testing method, device and synchronization testing equipment. Background Art

[0002] Satellite receivers can receive timing signals from the Global Navigation Satellite System (GNSS) and calculate the time of the satellite system. However, the time of each satellite system is not consistent, usually with a difference of tens of nanoseconds (ns), for example, greater than 20ns, and not fixed. When different time synchronization devices receive different satellite system times, it will cause an absolute error of tens of nanoseconds in the time source, which cannot meet the 30ns accuracy requirement of time synchronization devices in 5G networks.

[0003] The multi-mode satellite receiver can choose to receive one satellite system signal as the primary one and the remaining satellite system signals as the backup one.

[0004] Satellite common view principle: Figure 1 As shown in the figure, (a) A is set as the common view master station and B is set as the slave station. The receivers placed at the two stations observe the same GPS satellite at the same time; (b) the time difference between the receiver at station A and the GNSS system time is measured at station A, and the time difference between the receiver at station B and the GNSS system time is measured at station B; (c) the time difference between station A and station B is obtained by subtracting the two time difference values, thus completing the timing.

[0005] The time accuracy of non-satellite common-view synchronization testers with higher accuracy is 20ns, which cannot be used to test time synchronization equipment with an accuracy requirement of up to 30ns in 5G networks; and non-satellite common-view synchronization testers with higher accuracy use dual-frequency or precise single-point signals to receive satellite signals and calculate satellite time, and synchronize with it, comparing the input signal of the device under test with its own time to form a test result. The accuracy of its own time is generally 20ns, which is suitable for testing 100ns accuracy equipment.

[0006] The satellite common view synchronization tester generally receives the satellite common view data of the official timing agency's single time base, or solves and synchronizes to the time base, compares the input signal of the device under test with its own time to form a test result; or compares the comparison result of the input signal of the device under test with the satellite signal with the satellite common view data of the timing agency to form a test result. The test accuracy is generally 10ns, the time base is single, and it cannot be used to test the time synchronization equipment in the 5G network with an accuracy requirement of up to 30ns. Summary of the invention

[0007] The purpose of the present invention is to provide a synchronization system testing method, device and synchronization testing equipment to solve the problem that the synchronization testing equipment in the prior art cannot be used for time synchronization equipment with higher precision requirements in 5G or higher networks.

[0008] In order to solve the above problem, an embodiment of the present invention provides a synchronous system testing method, which is performed by a synchronous testing device, and includes:

[0009] Obtaining a first time reference; the first time reference is a time reference of an output signal of the device under test;

[0010] According to the first time reference, the output signal is compared with the time reference corresponding to the satellite common view server to determine the test result of the output signal.

[0011] Wherein, obtaining the first time reference includes:

[0012] Acquire an output signal of the device under test, wherein the output signal of the device under test includes: a time reference identifier;

[0013] According to the time reference identifier, it is determined that the time reference corresponding to the time reference identifier is the first time reference.

[0014] Wherein, obtaining the first time reference includes:

[0015] A preconfigured time reference of the output signal of the device under test is obtained as the first time reference.

[0016] Wherein, before performing a common view comparison between the output signal and a time reference corresponding to a satellite common view server according to the first time reference and determining a test result of the output signal, the method further includes:

[0017] The satellite common view data and satellite timing signals of the satellite common view server are acquired; the satellite common view data includes clock difference information of multiple time references and common view satellites.

[0018] The step of comparing the output signal with a time reference corresponding to a satellite common view server according to the first time reference to determine a test result of the output signal includes:

[0019] Compare and subtract a first time value corresponding to the output signal from a second time value corresponding to the satellite timing signal to obtain a first difference value;

[0020] Determine, according to a first time reference, first clock difference information corresponding to the first time reference in the satellite common view data;

[0021] The first difference is compared with the first clock error information to determine a test result of the output signal.

[0022] Wherein, the method further comprises:

[0023] Monitoring the output signal of the device under test in real time;

[0024] If the time base identifier carried by the output signal of the device under test changes, an alarm message is sent; the alarm message is used to indicate the switching of the time base of the output signal of the device under test.

[0025] Wherein, if the time reference identifier carried by the output signal of the device under test changes, the method further includes:

[0026] Stores the time base of the output signal after switching and the switching time.

[0027] The embodiment of the present invention further provides a synchronization system testing device, which is applied to synchronization testing equipment, including:

[0028] A first acquisition module, used to acquire a first time reference; the first time reference is a time reference of an output signal of the device under test;

[0029] The test module is used to perform a common view comparison between the output signal and a time reference corresponding to a satellite common view server according to the first time reference, so as to determine a test result of the output signal.

[0030] An embodiment of the present invention further provides a synchronous test device, comprising a processor and a transceiver, wherein the transceiver receives and sends data under the control of the processor, and the processor is used to perform the following operations:

[0031] Obtaining a first time reference; the first time reference is a time reference of an output signal of the device under test;

[0032] According to the first time reference, the output signal is compared with the time reference corresponding to the satellite common view server to determine the test result of the output signal.

[0033] The processor is further configured to perform the following operations:

[0034] Acquire an output signal of the device under test, wherein the output signal of the device under test includes: a time reference identifier;

[0035] According to the time reference identifier, it is determined that the time reference corresponding to the time reference identifier is the first time reference.

[0036] The processor is further configured to perform the following operations:

[0037] A preconfigured time reference of the output signal of the device under test is obtained as the first time reference.

[0038] The processor is further configured to perform the following operations:

[0039] The satellite common view data and satellite timing signals of the satellite common view server are acquired; the satellite common view data includes clock difference information of multiple time references and common view satellites.

[0040] The processor is further configured to perform the following operations:

[0041] Compare and subtract a first time value corresponding to the output signal from a second time value corresponding to the satellite timing signal to obtain a first difference value;

[0042] Determine, according to a first time reference, first clock difference information corresponding to the first time reference in the satellite common view data;

[0043] The first difference is compared with the first clock error information to determine a test result of the output signal.

[0044] The processor is further configured to perform the following operations:

[0045] Monitoring the output signal of the device under test in real time;

[0046] If the time base identifier carried by the output signal of the device under test changes, an alarm message is sent; the alarm message is used to indicate the switching of the time base of the output signal of the device under test.

[0047] The processor is further configured to perform the following operations:

[0048] If the time base identifier carried by the output signal of the device under test changes, the output signal time base after switching and the switching time are stored.

[0049] An embodiment of the present invention further provides a synchronous testing device, comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor implements the synchronous system testing method as described above when executing the program.

[0050] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, wherein the program implements the steps in the synchronization system testing method as described above when executed by a processor.

[0051] The above technical solution of the present invention has at least the following beneficial effects:

[0052] In the synchronization system testing method, device and synchronization testing equipment of the embodiments of the present invention, satellite common view can be achieved and a time base can be selected according to the output signal of the device under test, so that the time base of the synchronization testing equipment is consistent with the time base of the device under test, thereby eliminating system deviation and meeting the needs of high-precision testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram showing the principle of satellite common view;

[0054] Figure 2 A flowchart showing the steps of a synchronization system testing method provided by an embodiment of the present invention;

[0055] Figure 3 A schematic diagram showing the structure of a synchronization system testing device provided by an embodiment of the present invention;

[0056] Figure 4 A schematic diagram showing the structure of a synchronous testing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0058] like Figure 2 As shown, an embodiment of the present invention further provides a synchronous system testing method, which is performed by a synchronous testing device, and includes:

[0059] Step 201, obtaining a first time reference; the first time reference is a time reference of an output signal of the device under test;

[0060] Step 202: perform a common-view comparison between the output signal and a time reference corresponding to a satellite common-view server according to the first time reference, and determine a test result of the output signal.

[0061] For example, the time reference types of the first time reference include: GNSS satellite (GPS, Beidou, etc.), time reference maintained by a time server. The time reference maintained by the time server includes: the time reference synchronized with the upstream time server, and the time reference synchronized with each satellite system.

[0062] As an optional embodiment, step 201 includes:

[0063] Acquire an output signal of the device under test, wherein the output signal of the device under test includes: a time reference identifier;

[0064] According to the time reference identifier, it is determined that the time reference corresponding to the time reference identifier is the first time reference.

[0065] In other words, the synchronous test equipment determines the time reference of the output signal of the device under test based on the time reference identifier carried by the output signal of the device under test and the time reference type corresponding to the time reference identifier, and uses it as the time reference of the interface connected to the output signal of the device under test and as the basis for the subsequent accurate calculation of the test results.

[0066] As another optional embodiment, step 201 includes:

[0067] A pre-configured time reference of the output signal of the device under test is obtained as the first time reference. For example, the time reference of the output signal of the device under test of the synchronization test device is configured by a user.

[0068] In at least one embodiment of the present invention, before step 202, the method further includes:

[0069] Acquire satellite common view data and satellite timing signals from a satellite common view server; the satellite common view data includes clock difference information between multiple time references and common view satellites. The clock difference information includes: clock difference values ​​and corresponding time reference identifiers.

[0070] Accordingly, step 202 includes:

[0071] Compare and subtract a first time value corresponding to the output signal from a second time value corresponding to the satellite timing signal to obtain a first difference value;

[0072] Determine, according to a first time reference, first clock difference information corresponding to the first time reference in the satellite common view data;

[0073] The first difference is compared with the first clock error information to determine a test result of the output signal.

[0074] In an embodiment of the present invention, the synchronization test device compares the time value obtained by solving the output signal of the device under test with the time value obtained by solving the received satellite timing signal to obtain a first difference value, and the first difference value is compared with the clock difference corresponding to the time reference of the device under test in the received satellite common view data, and the comparison result is used as the test result of the device under test. This method simultaneously realizes the consistency of the test reference and the device under test reference, as well as the satellite common view test mode, which improves the test accuracy while eliminating the error introduced by different time references.

[0075] As another optional embodiment, if the output signal of the device under test includes a time reference identifier, the method further includes:

[0076] Monitoring the output signal of the device under test in real time;

[0077] If the time base identifier carried by the output signal of the device under test changes, an alarm message is sent; the alarm message is used to indicate the switching of the time base of the output signal of the device under test.

[0078] and / or,

[0079] If the time reference identifier carried by the output signal of the device under test changes, the method further includes:

[0080] Stores the time base of the output signal after switching and the switching time.

[0081] In other words, if the output signal of the device under test carries the time reference identifier, the synchronization test device continuously monitors the time synchronization signal of the device under test (i.e., the output signal of the device under test) to determine whether the time reference identifier of the output signal of the device under test carried by the time synchronization signal changes; if a change occurs, an output signal time reference switching alarm is generated, and the output signal time reference and switching time after the switch are recorded.

[0082] Example 1

[0083] In step 1, the synchronous test equipment receives satellite common view data, GPS satellite signals and Beidou satellite signals from the satellite common view server; the satellite common view data contains multiple time references and clock difference information of the common view satellites; the multiple time references include the local time reference of the GPS satellite system and the local time reference of the Beidou navigation satellite system.

[0084] In step 2, the synchronization test device receives the time synchronization message of the device under test (i.e., the output signal of the device under test), and determines whether the timeSource field of the time synchronization message carries the time base identifier of the output signal of the device under test. The time base types include GNSS-GPS and GNSS-Beidou, etc. It is assumed that the time base in this example is GNSS-Beidou.

[0085] Step 3: According to the time reference type corresponding to the time reference identifier, determine that the time reference of the output signal of the device under test is GNSS-Beidou, which is used as the time reference of the interface connecting the output signal of the device under test. Alternatively, the time reference of the interface connecting the synchronous test device and the output signal of the device under test can be manually configured to be GNSS-Beidou.

[0086] In step 4, the synchronous test instrument compares the time value calculated in the time message received in step 2 with the GNSS satellite time value received in step 1, and compares the difference with the clock error of the time base of the device under test determined in step 3 in the satellite common view data received in step 1. The comparison result is used as the test result of the device under test.

[0087] As an optional solution, if the time reference identifier is carried in step 2, the synchronization test equipment continuously monitors the time synchronization signal of the device under test to determine whether the time reference identifier of the output signal of the device under test carried by the time synchronization signal has changed. Assuming that the time reference of the output signal changes from GNSS-Beidou to GNSS-GPS, an output signal time reference switching alarm should be generated, and the output signal time reference GNSS-GPS and the switching time after the switch should be recorded.

[0088] In summary, the embodiments of the present invention can not only realize satellite common view but also select the time reference according to the output signal of the device under test, so that the time reference of the synchronous test device is consistent with the time reference of the device under test, eliminating system deviation and meeting the needs of high-precision testing.

[0089] like Figure 3 As shown, an embodiment of the present invention further provides a synchronous system testing device, which is applied to a synchronous testing device, comprising:

[0090] A first acquisition module 301 is used to acquire a first time reference; the first time reference is a time reference of an output signal of a device under test;

[0091] The test module 302 is used to perform a common view comparison between the output signal and a time reference corresponding to a satellite common view server according to the first time reference, and determine a test result of the output signal.

[0092] As an optional embodiment, the first acquisition module includes:

[0093] The first acquisition submodule is used to acquire an output signal of the device under test, wherein the output signal of the device under test includes: a time reference identifier;

[0094] The second acquisition submodule is configured to determine, according to the time reference identifier, that the time reference corresponding to the time reference identifier is the first time reference.

[0095] As an optional embodiment, the first acquisition module includes:

[0096] The third acquisition submodule is used to acquire a pre-configured time reference of the output signal of the device under test as the first time reference.

[0097] As an optional embodiment, the device further includes:

[0098] The second acquisition module is used to acquire satellite common view data and satellite timing signals from a satellite common view server; the satellite common view data includes clock difference information between multiple time references and common view satellites.

[0099] As an optional embodiment, the test module includes:

[0100] A first comparison submodule is used to compare and subtract a first time value corresponding to the output signal from a second time value corresponding to the satellite timing signal to obtain a first difference value;

[0101] A second comparison submodule is used to determine, according to a first time reference, first clock difference information corresponding to the first time reference in the satellite common view data;

[0102] The third comparison submodule is used to compare the first difference with the first clock error information to determine the test result of the output signal.

[0103] As an optional embodiment, the device further includes:

[0104] A monitoring module, used for monitoring the output signal of the device under test in real time;

[0105] The alarm module is used to send an alarm message if the time base identifier carried by the output signal of the device under test changes; the alarm message is used to indicate the switching of the time base of the output signal of the device under test.

[0106] As an optional embodiment, the device further includes:

[0107] The storage module is used to store the output signal time base and the switching time after the switch if the time base identifier carried by the output signal of the device under test changes.

[0108] The embodiment of the present invention can realize satellite common view and select the time reference according to the output signal of the device under test, so that the time reference of the synchronous test device is consistent with the time reference of the device under test, eliminates system deviation and meets the requirements of high-precision testing at the same time.

[0109] It should be noted that the synchronization system testing device provided in the embodiment of the present invention is a device capable of implementing the above-mentioned synchronization system method, and all embodiments of the above-mentioned synchronization system testing method are applicable to the device and can achieve the same or similar beneficial effects.

[0110] like Figure 4 As shown, an embodiment of the present invention further provides a synchronization test device, including a processor 400 and a transceiver 410, wherein the transceiver 410 receives and sends data under the control of the processor 400, and the processor 400 is used to perform the following operations:

[0111] Obtaining a first time reference; the first time reference is a time reference of an output signal of the device under test;

[0112] According to the first time reference, the output signal is compared with the time reference corresponding to the satellite common view server to determine the test result of the output signal.

[0113] As an optional embodiment, the processor 400 is further configured to perform the following operations:

[0114] Acquire an output signal of the device under test, wherein the output signal of the device under test includes: a time reference identifier;

[0115] According to the time reference identifier, it is determined that the time reference corresponding to the time reference identifier is the first time reference.

[0116] As an optional embodiment, the processor 400 is further configured to perform the following operations:

[0117] A preconfigured time reference of the output signal of the device under test is obtained as the first time reference.

[0118] As an optional embodiment, the processor 400 is further configured to perform the following operations:

[0119] The satellite common view data and satellite timing signals of the satellite common view server are acquired; the satellite common view data includes clock difference information of multiple time references and common view satellites.

[0120] As an optional embodiment, the processor 400 is further configured to perform the following operations:

[0121] Compare and subtract a first time value corresponding to the output signal from a second time value corresponding to the satellite timing signal to obtain a first difference value;

[0122] Determine, according to a first time reference, first clock difference information corresponding to the first time reference in the satellite common view data;

[0123] The first difference is compared with the first clock error information to determine a test result of the output signal.

[0124] As an optional embodiment, the processor 400 is further configured to perform the following operations:

[0125] Monitoring the output signal of the device under test in real time;

[0126] If the time base identifier carried by the output signal of the device under test changes, an alarm message is sent; the alarm message is used to indicate the switching of the time base of the output signal of the device under test.

[0127] As an optional embodiment, the processor 400 is further configured to perform the following operations:

[0128] If the time base identifier carried by the output signal of the device under test changes, the output signal time base after switching and the switching time are stored.

[0129] The embodiment of the present invention can realize satellite common view and select the time reference according to the output signal of the device under test, so that the time reference of the synchronous test device is consistent with the time reference of the device under test, eliminates system deviation and meets the requirements of high-precision testing at the same time.

[0130] It should be noted that the synchronization test device provided in the embodiment of the present invention is a synchronization test device capable of implementing the above-mentioned synchronization system method. Therefore, all embodiments of the above-mentioned synchronization system test method are applicable to the synchronization test device and can achieve the same or similar beneficial effects.

[0131] An embodiment of the present invention also provides a synchronous testing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the various processes in the synchronous system testing method embodiment as described above are implemented, and the same technical effect can be achieved. To avoid repetition, they will not be described here.

[0132] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, each process in the embodiment of the synchronous system test method described above is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0133] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0134] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A device that specifies functions in one or more processes and / or one or more blocks.

[0135] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable storage medium produce a paper product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0136] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that the computer or other programmable device executes a series of operating steps to produce a computer-implemented process, thereby providing instructions executed on the computer or other programmable device for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0137] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A synchronization system testing method, which is executed by a synchronization testing device, characterized in that, it includes: Obtain a first time reference; the first time reference is the time reference of the output signal of the device under test; According to the first time reference, perform a common view comparison between the output signal and the time reference corresponding to the satellite common view server to determine the test result of the output signal; Before performing a common view comparison between the output signal and the time reference corresponding to the satellite common view server according to the first time reference to determine the test result of the output signal, the method further includes: Obtain the satellite common view data and satellite timing signal of the satellite common view server; the satellite common view data includes the clock difference information between multiple time references and the common view satellites; The step of performing a common view comparison between the output signal and the time reference corresponding to the satellite common view server according to the first time reference to determine the test result of the output signal includes: Compare and subtract the first time value corresponding to the output signal and the second time value corresponding to the satellite timing signal to obtain a first difference; According to the first time reference, determine the first clock difference information corresponding to the first time reference in the satellite common view data; Compare the first difference with the first clock difference information to determine the test result of the output signal.

2. The method according to claim 1, characterized in that, the step of obtaining the first time reference includes: Obtain the output signal of the device under test, and the output signal of the device under test includes: a time reference identifier; According to the time reference identifier, determine the time reference corresponding to the time reference identifier as the first time reference.

3. The method according to claim 1, characterized in that, the step of obtaining the first time reference includes: Obtain the time reference of the output signal of the device under test configured in advance as the first time reference.

4. The method according to claim 2, characterized in that, the method further includes: Real-time monitor the output signal of the device under test; If the time reference identifier carried by the output signal of the device under test changes, send an alarm message; the alarm message is used to indicate the switching of the time reference of the output signal of the device under test.

5. The method according to claim 4, characterized in that, if the time reference identifier carried by the output signal of the device under test changes, the method further includes: Store the switched output signal time reference and the switching time.

6. A synchronization system testing device, which is applied to a synchronization testing device, characterized in that, it includes: A first acquisition module, which is used to obtain a first time reference; The first time reference is the time reference of the output signal of the device under test; A testing module, which is used to perform a common view comparison between the output signal and the time reference corresponding to the satellite common view server according to the first time reference to determine the test result of the output signal; The device further includes: A second acquisition module, which is used to obtain the satellite common view data and satellite timing signal of the satellite common view server; the satellite common view data includes the clock difference information between multiple time references and the common view satellites; The testing module includes: The first comparison sub-module is used to compare and subtract the first time value corresponding to the output signal from the second time value corresponding to the satellite timing signal to obtain a first difference value; The second comparison sub-module is used to determine, according to a first time reference, first clock difference information corresponding to the first time reference in the satellite common view data; The third comparison sub-module is used to compare the first difference value with the first clock difference information to determine the test result of the output signal.

7. A synchronization test device, comprising a processor and a transceiver, wherein the transceiver receives and transmits data under the control of the processor, characterized in that, the processor is used to perform the following operations: Obtain a first time reference; the first time reference is the time reference of the output signal of the device under test; According to the first time reference, perform a common view comparison between the output signal and the time reference corresponding to the satellite common view server to determine the test result of the output signal; The processor is further used to perform the following operations: Obtain the satellite common view data and the satellite timing signal of the satellite common view server; the satellite common view data includes clock difference information of multiple time references and common view satellites; The processor is further used to perform the following operations: Compare and subtract the first time value corresponding to the output signal from the second time value corresponding to the satellite timing signal to obtain a first difference value; Determine, according to the first time reference, first clock difference information corresponding to the first time reference in the satellite common view data; Compare the first difference value with the first clock difference information to determine the test result of the output signal.

8. The synchronization test device according to claim 7, characterized in that, the processor is further used to perform the following operations: Obtain the output signal of the device under test, and the output signal of the device under test includes: a time reference identifier; According to the time reference identifier, determine that the time reference corresponding to the time reference identifier is the first time reference.

9. The synchronization test device according to claim 7, characterized in that, the processor is further used to perform the following operations: Obtain the time reference of the output signal of the device under test configured in advance as the first time reference.

10. The synchronization test device according to claim 8, characterized in that, the processor is further used to perform the following operations: Monitor the output signal of the device under test in real time; If the time reference identifier carried by the output signal of the device under test changes, send an alarm message; the alarm message is used to indicate the switching of the time reference of the output signal of the device under test.

11. The synchronization test device according to claim 10, characterized in that, the processor is further used to perform the following operations: If the time reference identifier carried by the output signal of the device under test changes, store the switched output signal time reference and the switching time.

12. A synchronization test device, comprising a memory, a processor, and a program stored on the memory and executable on the processor; characterized in that, when the processor executes the program, it implements the synchronization system test method according to any one of claims 1 to 5.

13. A computer-readable storage medium, on which a computer program is stored, It is characterized in that when the program is executed by a processor, it implements the steps in the synchronous system testing method according to any one of claims 1 to 5.

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