A method and system for evaluating the standard compliance of a common-view time comparison device

Abstract

The present invention discloses a method and a system for evaluating the standard compliance of a common-view time comparison device. The method includes: providing satellite signal input, 1PPS time signal and 10MHz frequency signal to the common-view time comparison device to be evaluated, so that the device outputs original measurement data and common-view exchange files; programming standard protocol simulation software and protocol analysis software; collecting the original measurement data and common-view exchange files output by the device, and analyzing to obtain the results of the consistency between the formats of the original measurement data and common-view exchange files output by the device and the standard; using a signal source to generate 1PPS time signal and 10MHz frequency signal meeting certain characteristics, and using them as the input signals of the device, and analyzing to obtain the results of whether the device can work normally; if the above analysis results all meet the corresponding standards, then the device complies with the specified standard specifications; if any one of the above analysis results does not meet the corresponding standards, then the device does not comply with the specified standard specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of standard compliance assessment, and more specifically, to a method and system for standard compliance assessment of a common-view time comparison device. Background Art

[0002] Common-view time comparison is that GNSS (Global Navigation Satellite System) common-view receivers located at two different places simultaneously observe one or more GNSS satellites at the same moment, and obtain the deviation between the local time and the GNSS system time GNSST through pseudorange measurement. This deviation includes various errors introduced by satellites, signal propagation paths, and receiver terminals. After deducting various errors through data exchange between the two places and taking the difference, the time difference between the two laboratories can be obtained. The essence of common-view time comparison is to obtain the time deviation between two users participating in the comparison.

[0003] Currently, common-view time comparison has been widely applied in the military field and civilian aspects, and can achieve high-precision time comparison results at low cost, meeting the application requirements of high-precision time-frequency comparison in fields such as power, telecommunications, and transportation. In addition, the common-view comparison method is one of the methods used for high-precision time comparison between time-frequency reference laboratories under the International Bureau of Weights and Measures.

[0004] The common-view time comparison device is the core equipment of common-view time comparison, and it must be fully domesticated to ensure the security of time comparison. However, there are currently many problems with domesticated common-view time comparison devices. The main problems are that the devices produced by each research and development manufacturer have different functions, different interfaces, and incompatible protocols, resulting in poor compatibility between products and inability to replace each other. When the product of a certain manufacturer is adopted in a certain application, subsequent product maintenance, upgrade, replacement, etc. can only continue to use the products and technologies of that manufacturer, which is not conducive to introducing market competition and ultimately affects the technological development of products and the improvement of equipment performance. Summary of the Invention

[0005] An object of the present invention is to provide a method and system for standard compliance assessment of a common-view time comparison device.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention provides a method for standard compliance assessment of a common-view time comparison device, including:

[0008] Providing satellite signal input for the common-view time comparison device to be evaluated, and using a local time frequency source to provide a 1PPS time signal and a 10MHz frequency signal for the common-view time comparison device to be evaluated, so that the common-view time comparison device to be evaluated outputs original measurement data and a common-view exchange file;

[0009] Develop standard protocol simulation software and protocol analysis software; among them, the standard protocol simulation software is used to simulate the standard protocol for the to-be-tested common-view time comparison device to output the original measurement data and the common-view exchange file; the protocol analysis software is used to analyze the consistency between the format of the original measurement data and the common-view exchange file output by the to-be-tested common-view time comparison device and the standard protocol;

[0010] Collect the original measurement data and the common-view exchange file output by the to-be-tested common-view time comparison device, and analyze to obtain the result of the consistency between the format of the original measurement data and the common-view exchange file output by the to-be-tested common-view time comparison device and the standard;

[0011] Use a signal source to generate a 1PPS time signal and a 10MHz frequency signal with certain characteristics to replace the local time frequency source to provide a 1PPS time signal and a 10MHz frequency signal for the to-be-tested common-view time comparison device, and use them as the input signals of the to-be-tested common-view time comparison device, and analyze to obtain the result of whether the to-be-tested common-view time comparison device can work normally;

[0012] If the above analysis results all meet the corresponding standards, the to-be-tested common-view time comparison device meets the specified standard specifications and can meet the interconnection and interoperability with other information systems after being networked; if any one of the above analysis results does not meet the corresponding standards, the to-be-tested common-view time comparison device does not meet the specified standard specifications and does not meet the network access conditions.

[0013] Optionally, use a GNSS satellite navigation signal simulator or a GNSS antenna to provide satellite signal input for the to-be-tested common-view time comparison device.

[0014] Optionally, the 1PPS time signal and the 10MHz frequency signal with certain characteristics include the signal amplitude, impedance, and level characteristics of the 1PPS time signal and the 10MHz frequency signal.

[0015] Optionally, the standard protocol of the original measurement data is the Rinex standard protocol, and the standard protocol of the common-view exchange file is the CGGTTS standard protocol.

[0016] The second aspect of the present invention provides a standard compliance evaluation system for a common-view time comparison device, including:

[0017] A satellite signal simulator or a GNSS antenna, a to-be-tested common-view time comparison device, a local time frequency source, a signal source, and a working computer, where,

[0018] The satellite signal simulator or the GNSS antenna provides satellite signal input for the to-be-tested common-view time comparison device, so that the to-be-tested common-view time comparison device can work normally and output the original measurement data and the common-view exchange file;

[0019] The signal source is used to generate a 1PPS time signal and a 10MHz frequency signal that meet certain characteristics, and use them as the input signals of the common-view time comparison device to check whether the device can work properly;

[0020] The local time and frequency source provides a stable and reliable 1PPS time signal and 10MHz frequency signal for the common-view time comparison device to be evaluated;

[0021] The working computer is used to deploy standard protocol simulation software and protocol analysis software, as well as store the output data files and analysis results of the common-view time comparison device to be evaluated.

[0022] Optionally, the 1PPS time signal and 10MHz frequency signal with certain characteristics include the signal amplitude, impedance, and level characteristics of the 1PPS time signal and 10MHz frequency signal.

[0023] Optionally, the standard protocol for the original measurement data is the Rinex standard protocol, and the standard protocol for the common-view exchange file is the CGGTTS standard protocol.

[0024] The beneficial effects of the present invention are as follows:

[0025] The technical solution of the present invention provides a method and system for evaluating the standard compliance of a common-view time comparison device, which is applicable to the evaluation of the common-view time comparison device. The present invention uses the relevant national standards and national military standards of the selected common-view time comparison device as the reference basis, and through the standard protocol simulation software and protocol analysis software, analyzes the characteristics of the output signal of the common-view time comparison device to be evaluated and the compliance of the format of the output data file with the standard protocol, and according to the analysis results of the protocol analysis software, evaluates the standard compliance of the common-view time comparison device to be evaluated; and by making the input signal meet certain conditions, verifies whether the input interface of the receiver works properly. The method and system provided by the present invention can evaluate the standard compliance of the common-view time comparison device, provide guarantee for the interconnection and interoperability between the common-view time comparison device and other systems, and provide a reference basis for the access of the common-view time comparison device to the network. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0027] Figure 1 Shows a schematic diagram of the system for evaluating the standard compliance of the common-view time comparison device provided by the present invention.

[0028] Figure 2 Shows a flowchart of the method for evaluating the standard compliance of the common-view time comparison device provided by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] To more clearly illustrate the present invention, the following further describes the present invention in conjunction with preferred embodiments and the accompanying drawings. Similar components in the drawings are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0030] The input interfaces of the common-view time comparison device include a 1PPS (Pulse Per Second) time signal interface and a 10MHz frequency signal interface, and the outputs are the original measurement data file and the common-view data file. The input signals of the common-view time comparison device must meet certain requirements for the device to work properly and output the corresponding original measurement data and common-view data files. Otherwise, the common-view time comparison device cannot work properly. Therefore, it is necessary to evaluate the influence of the input 1PPS time signal and 10MHz frequency signal on the common-view time comparison device. The original measurement data and common-view data files output by the common-view time comparison device must also meet specific format requirements for the user to correctly parse the data in each field and thus obtain the correct time comparison result. Therefore, it is necessary to evaluate the output data file format of the common-view time comparison device.

[0031] To standardize the data processing process, the International Time and Frequency Consultative Committee stipulated the GPS time comparison format standard GGTTS V01 in 1993. In 1998, the Russian GLONASS satellite navigation system was added to this standard and it was named CGGTTS V02. With the continuous development of satellite navigation systems such as the European Galileo and the Chinese Beidou, in 2015, the GNSS Time Transfer Group of the CCTF expanded the time comparison standard again and renamed it CGGTTS V2E. This version is compatible with the old version data format and can complete common-view time comparison between different versions. In addition to GPS and GLONASS, CGGTTS V2E also includes the time comparison standards of Beidou, Galileo and the Japanese Quasi-Zenith Satellite Navigation System.

[0032] In view of this, an embodiment of the present invention provides a method for evaluating the standard compliance of a common-view time comparison device, as Figure 1 shown, including:

[0033] Step S1: Provide satellite signal input for the common-view time comparison device to be evaluated, and use the local time and frequency source to provide a 1PPS time signal and a 10MHz frequency signal for the common-view time comparison device to be evaluated, so that the common-view time comparison device to be evaluated outputs the original measurement data and the common-view exchange file.

[0034] In a specific example, a GNSS satellite navigation signal simulator or a GNSS antenna is used to provide satellite signal input for the co-view time comparison device to be evaluated. In this embodiment, a GNSS satellite navigation signal simulator is selected. A GNSS co-view receiver is selected as the co-view time comparison device to be evaluated.

[0035] Connect the GNSS satellite navigation signal simulator or GNSS antenna, GNSS co-view receiver, local time and frequency source, signal source, and working computer together, and power on all the above devices. Among them, the GNSS satellite navigation signal simulator or GNSS antenna provides satellite signal input for the co-view time comparison device to be evaluated, enabling it to work properly and output original measurement data and CGGTTS files for exchange. The local time and frequency source provides a stable and reliable 1PPS time signal and 10MHz frequency signal to the GNSS co-view receiver. The working computer is used to deploy standard protocol simulation software and protocol analysis software, as well as store the output data files and analysis results of the GNSS co-view receiver.

[0036] Step S2: Compile standard protocol simulation software and protocol analysis software.

[0037] Among them, the standard protocol simulation software is used to simulate the standard protocol to facilitate subsequent protocol analysis of the device output data files. The protocol analysis software is used to process and analyze the output data files of the GNSS co-view receiver, analyze the file format, and give corresponding analysis results.

[0038] Step S3: Collect the original measurement data and co-view exchange files output by the co-view time comparison device to be evaluated, and analyze to obtain the result of the consistency between the original measurement data and co-view exchange file formats output by the co-view time comparison device to be evaluated and the standard.

[0039] In a specific example, collect the original measurement data output by the co-view time comparison device to be evaluated. The standard protocol of the original measurement data is the Rinex file. With the Rinex standard protocol as a reference, compile the Rinex standard protocol simulation software, and use the Rinex protocol analysis software to analyze the consistency between the original measurement data file format output by the co-view time comparison device to be evaluated and the standard, including the consistency of each field of the file header and file data with the standard.

[0040] Collect the co-view exchange files output by the co-view time comparison device to be evaluated. The standard protocol of the co-view exchange files is the CGGTTS file. With the CGGTTS standard protocol as a reference, compile the CGGTTS standard protocol simulation software, and use the CGGTTS protocol analysis software to analyze the consistency between the co-view exchange file format output by the co-view time comparison device to be evaluated and the standard.

[0041] Step S4: Use a signal source to generate a 1PPS time signal and a 10MHz frequency signal with certain characteristics to replace the local time and frequency source, and provide the 1PPS time signal and the 10MHz frequency signal for the co-view time comparison device to be evaluated. Take them as the input signals of the co-view time comparison device to be evaluated, and analyze the result of whether the co-view time comparison device to be evaluated can work properly.

[0042] In a specific example, the 1PPS time signal and the 10MHz frequency signal with certain characteristics include the signal amplitude, impedance and level characteristics of the 1PPS time signal and the 10MHz frequency signal.

[0043] It should be noted that the present invention does not limit the certain characteristics to signal amplitude, impedance and level characteristics. As long as the 1PPS time signal and the 10MHz frequency signal can be characterized, other characteristics are also applicable to the present invention.

[0044] Step S5: Step S3 is used to verify the output interface of the GNSS co-view receiver, and step S4 is used to verify the input interface of the GNSS co-view receiver. According to the standard compliance analysis result of the data file format in step S3 and whether the device in step S4 can work properly, the standard compliance of the co-view time comparison device to be evaluated is evaluated. If the above analysis results all meet the corresponding standards, the co-view time comparison device to be evaluated meets the specified standard specifications and can meet the interconnection and interoperability with other information systems after networking; if any of the above analysis results does not meet the corresponding standards, the co-view time comparison device to be evaluated does not meet the specified standard specifications and does not meet the networking conditions.

[0045] Another embodiment of the present invention provides a standard compliance evaluation system for a co-view time comparison device, as Figure 2 shown. This system is composed of a satellite signal simulator or a GNSS antenna, a co-view time comparison device to be evaluated, a local time and frequency source, a signal source and a working computer connected together.

[0046] Among them, the satellite signal simulator or the GNSS antenna provides satellite signal input for the co-view time comparison device to be evaluated, so that the co-view time comparison device to be evaluated can work properly and output the original measurement data and the co-view exchange file;

[0047] The signal source is used to generate a 1PPS time signal and a 10MHz frequency signal with certain characteristics, take them as the input signals of the co-view time comparison device, and check whether the device can work properly;

[0048] The local time and frequency source provides a stable and reliable 1PPS time signal and a 10MHz frequency signal for the co-view time comparison device to be evaluated;

[0049] The working computer is used to deploy standard protocol simulation software and protocol analysis software, and store the output data files and analysis results of the common view time comparison device to be evaluated.

[0050] In a specific example, the 1PPS time signal and 10MHz frequency signal of the certain characteristics are the signal amplitude, impedance and level characteristics including the 1PPS time signal and 10MHz frequency signal.

[0051] It should be noted that the present invention does not limit the certain characteristics to signal amplitude, impedance and level characteristics. As long as the 1PPS time signal and 10MHz frequency signal can be characterized, other characteristics are also applicable to the present invention.

[0052] In a specific example, the standard protocol of the original measurement data is the Rinex standard protocol, and the standard protocol of the common view exchange file is the CGGTTS standard protocol.

[0053] A method and system for evaluating the standard compliance of a common view time comparison device provided by the present invention are applicable to the evaluation of a common view time comparison device. The present invention uses the national standards and national military standards related to the selected common view time comparison device as a reference basis, and through standard protocol simulation software and protocol analysis software, analyzes the characteristics of the output signal of the common view time comparison device to be evaluated and the compliance of the format of the output data file with the standard protocol. According to the analysis results of the protocol analysis software, the standard compliance of the common view time comparison device to be evaluated is evaluated; and when the input signal meets certain conditions, the input interface of the receiver is verified to be working properly. The method and system provided by the present invention can evaluate the standard compliance of the common view time comparison device, provide guarantee for the interconnection and interoperability between the common view time comparison device and other systems, and provide a reference basis for the networking of the common view time comparison device.

[0054] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or variations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A method for evaluating the standard compliance of a common-view time comparison device, characterized in that, Comprising: Providing satellite signal input for the co - vision time comparison device to be evaluated, and using a local time - frequency source to provide a 1PPS time signal and a 10MHz frequency signal for the co - vision time comparison device to be evaluated, so that the co - vision time comparison device to be evaluated outputs original measurement data and co - vision exchange files; Compiling standard protocol simulation software and protocol analysis software; wherein, the standard protocol simulation software is used to simulate the standard protocol for the original measurement data and co - vision exchange files output by the co - vision time comparison device to be evaluated; the protocol analysis software is used to analyze the consistency between the formats of the original measurement data and co - vision exchange files output by the co - vision time comparison device to be evaluated and the standard protocol; Collecting the original measurement data and co - vision exchange files output by the co - vision time comparison device to be evaluated, and analyzing to obtain the result of the consistency between the formats of the original measurement data and co - vision exchange files output by the co - vision time comparison device to be evaluated and the standard; Using a signal source to generate a 1PPS time signal and a 10MHz frequency signal with certain characteristics to replace the local time - frequency source to provide a 1PPS time signal and a 10MHz frequency signal for the co - vision time comparison device to be evaluated, taking them as the input signals of the co - vision time comparison device to be evaluated, and analyzing to obtain the result of whether the co - vision time comparison device to be evaluated can work properly; If both the result of the consistency between the formats of the original measurement data and co - vision exchange files output by the co - vision time comparison device to be evaluated and the standard and the result of whether the co - vision time comparison device to be evaluated can work properly meet the corresponding standards, then the co - vision time comparison device to be evaluated conforms to the specified standard specifications and can meet the interconnection and interoperability with other information systems after being networked; if any one of the result of the consistency between the formats of the original measurement data and co - vision exchange files output by the co - vision time comparison device to be evaluated and the standard and the result of whether the co - vision time comparison device to be evaluated can work properly does not meet the corresponding standards, then the co - vision time comparison device to be evaluated does not conform to the specified standard specifications and does not meet the network access conditions.

2. The method according to claim 1, characterized in that, Using a GNSS satellite navigation signal simulator or a GNSS antenna to provide satellite signal input for the co - vision time comparison device to be evaluated.

3. The method according to claim 1, characterized in that The 1PPS time signal and 10MHz frequency signal with certain characteristics refer to the signal amplitude, impedance and level characteristics including the 1PPS time signal and 10MHz frequency signal.

4. The method according to claim 1, wherein The standard protocol for the original measurement data is the Rinex standard protocol, and the standard protocol for the co - vision exchange file is the CGGTTS standard protocol.

5. A co-view time comparison device standard compliance evaluation system for the co-view time comparison device standard compliance evaluation method as described in any one of claims 1-4, characterized in that, Comprising: A satellite signal simulator or a GNSS antenna, a co - vision time comparison device to be evaluated, a local time - frequency source, a signal source and a working computer, wherein, The satellite signal simulator or the GNSS antenna provides satellite signal input for the co - vision time comparison device to be evaluated, enabling the co - vision time comparison device to be evaluated to work properly and output original measurement data and co - vision exchange files; The signal source is used to generate a 1PPS time signal and a 10MHz frequency signal with certain characteristics, taking them as the input signals of the co - vision time comparison device, and checking whether the device can work properly; The local time frequency source provides a stable and reliable 1PPS time signal and 10MHz frequency signal for the co-view time comparison device to be evaluated. The working computer is used to deploy standard protocol simulation software and protocol analysis software, as well as store the output data files and analysis results of the co-view time comparison device to be evaluated.

6. The system according to claim 5, wherein The 1PPS time signal and 10MHz frequency signal with certain characteristics include the signal amplitude, impedance, and level characteristics of the 1PPS time signal and 10MHz frequency signal.

7. The system according to claim 5, wherein The standard protocol for the original measurement data is the Rinex standard protocol, and the standard protocol for the co-view exchange file is the CGGTTS standard protocol.

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