Method for correcting synchronization errors in optical communication based on a time-frequency synchronization analyzer

Abstract

The application discloses an optical communication synchronization error correction method based on a time-frequency synchronization analyzer, relates to the technical field of optical communication, and solves the technical problems that it is difficult to extract characteristic parameters of synchronization signal data and to automatically analyze and identify the type of the synchronization signal data, that it is difficult to analyze time offset, frequency offset, amplitude offset, pulse width offset and code rate offset according to the characteristic parameters, that it is difficult to perform synchronization error correction according to the analysis result of the synchronization error value, and that it is difficult to comprehensively evaluate the correction result. The application automatically identifies the type of the synchronization signal data through the time-frequency synchronization analyzer, judges whether correction is needed by analyzing the synchronization error value, comprehensively evaluates the correction result according to the synchronization error value before and after correction, and improves the efficiency of the synchronization error correction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical communication, and specifically relates to an optical communication synchronization error correction method based on a time-frequency synchronization analyzer. BACKGROUND

[0002] The XQ-980 time-frequency synchronization analyzer is a professional equipment for measuring and analyzing signal time-frequency characteristics, and provides high-performance client processing capability, a hardware timestamp-based hardware architecture design, thereby realizing high scalability and maximum network availability. In an optical communication system, a synchronization signal may have errors, thereby affecting the performance and stability of the system. The time-frequency synchronization analyzer can be used to collect synchronization signal data in real time and analyze the synchronization signal data, so that the synchronization error value in the optical communication system can be accurately determined, thereby providing strong support for subsequent correction operations.

[0003] The existing optical communication synchronization error correction method based on the time-frequency synchronization analyzer has the following problems: firstly, it is difficult to extract the characteristic parameters of the synchronization signal data and automatically analyze and identify the type of the synchronization signal data; secondly, it is difficult to analyze the time offset, frequency offset, amplitude offset, pulse width offset and code rate offset according to the characteristic parameters; thirdly, it is difficult to correct the synchronization error according to the analysis result of the synchronization error value; and finally, it is difficult to comprehensively evaluate the correction result. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art; for this purpose, the present application provides an optical communication synchronization error correction method based on a time-frequency synchronization analyzer, which is used to solve the following technical problems:

[0005] Firstly, it is difficult to extract the characteristic parameters of the synchronization signal data and automatically analyze and identify the type of the synchronization signal data; secondly, it is difficult to analyze the time offset, frequency offset, amplitude offset, pulse width offset and code rate offset according to the characteristic parameters; thirdly, it is difficult to correct the synchronization error according to the analysis result of the synchronization error value; and finally, it is difficult to comprehensively evaluate the correction result.

[0006] To solve the above problems, the first aspect of the present application provides an optical communication synchronization error correction method based on a time-frequency synchronization analyzer, comprising the following steps:

[0007] S1: connecting the time-frequency synchronization analyzer to the optical communication system, and collecting synchronization signal data in the optical communication system in real time through the time-frequency synchronization analyzer;

[0008] S2: pre-processing the collected synchronization signal data, including cleaning and standardization;

[0009] S3: extracting feature parameters of the synchronization signal data and analyzing and identifying the type of the synchronization signal data; analyzing and calculating the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset according to the analysis result; and comprehensively analyzing the synchronization error value according to the calculation result;

[0010] S4: performing synchronization error correction according to the analysis result of the synchronization error value;

[0011] S5: comprehensively evaluating the correction result.

[0012] As a further scheme of the application, the step S1 comprises the following steps:

[0013] The time reference signal is acquired by accessing the GPS / BD dual-mode satellite signal; meanwhile, the time signal sources of the Beidou satellite navigation system, GPS, IRIG-B (DC) code, PTP network time message and PPS_TOD ground-based time signal are received, and the synchronization signal data is collected in real time according to the time signal sources, wherein the synchronization signal data comprises: pulse signals synchronized with UTC coordinated universal time, IRIG-B time code, PPS_TOD time message, NTP / PTP network time message.

[0014] As a further scheme of the application, the step S3 comprises the following steps:

[0015] The collected and processed synchronization signal data is input into the time-frequency synchronization analyzer through the corresponding interface of the time-frequency synchronization analyzer, and the input synchronization signal data is subjected to filtering, amplification and shaping processing;

[0016] The time-frequency synchronization analyzer extracts the feature parameters of the input synchronization signal data, including the feature parameters of the pulse signal: frequency, amplitude and pulse width, the feature parameters of the IRIG-B time code: encoding format and code rate, and the feature parameters of the serial port time message and network time message: data frame structure and time stamp.

[0017] The time-frequency synchronization analyzer internally pre-stores feature modes of different types of signals, and after the feature parameters of the synchronization signal data are extracted, the time-frequency synchronization analyzer matches the feature parameters with the pre-stored modes to automatically identify the type of the accessed synchronization signal data.

[0018] Based on the results of feature extraction and mode matching, after the time-frequency synchronization analyzer identifies the type of the synchronization signal data, the display screen of the time-frequency synchronization analyzer displays the type and feature parameters of the accessed synchronization signal data.

[0019] As a further scheme of the present application: according to the analysis result, the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset are calculated, comprising the following steps:

[0020] Through the analysis formula: E T = |T signal -T base |

[0021] The time offset E T is obtained; wherein T base represents the time reference, T signal represents the time stamp of the synchronous signal data extraction;

[0022] Through the analysis formula:

[0023] The frequency offset E f is obtained; wherein f m represents the frequency of the pulse signal, f b represents the standard frequency;

[0024] Through the analysis formula:

[0025] The amplitude offset E A is obtained; wherein A m represents the amplitude of the pulse signal, A b represents the standard amplitude;

[0026] Through the analysis formula:

[0027] The pulse width offset E M is obtained; wherein M m represents the pulse width of the pulse signal, M b represents the standard pulse width;

[0028] Through the analysis formula:

[0029] The code rate offset E R is obtained; wherein R m represents the code rate of the IRIG-B time code, R b represents the standard code rate.

[0030] As a further scheme of the present application: according to the calculation result, the synchronous error value is comprehensively analyzed, comprising the following steps:

[0031] Through the analysis formula:

[0032] E = E T *w1 + E f *w2 + E A *w3 + EM w4+E R w5

[0033] obtain a synchronization error value E; wherein, E T , E f , E A , E M and E R respectively represent time offset, frequency offset, amplitude offset, pulse width offset and code rate offset; w1, w2, w3, w4 and w5 respectively represent the weights corresponding to the time offset, frequency offset, amplitude offset, pulse width offset and code rate offset.

[0034] As a further scheme of the present application: the step S4 comprises the following steps:

[0035] According to the synchronization error value, a threshold value is set, and the synchronization error value and the set threshold value ζ are analyzed to determine whether to correct;

[0036] When E≥ζ, it indicates that the synchronization error value exceeds the threshold value, and the synchronization signal data is corrected;

[0037] When E<ζ, it indicates that the synchronization error value does not exceed the threshold value, and no correction is needed;

[0038] According to the corrected synchronization signal data, the step 3 is repeated to analyze whether the corrected synchronization signal data exceeds the threshold value; when the corrected synchronization signal data does not exceed the threshold value, it indicates that the correction is completed; otherwise, the correction is re-performed and the above steps are repeated until the synchronization signal data does not exceed the threshold value, and the correction is ended.

[0039] As a further scheme of the present application: the step S5 comprises the following steps:

[0040] By analyzing the formula:

[0041] obtain a correction efficiency C; wherein, E before represents the synchronization error value before correction, E after represents the synchronization error value after correction;

[0042] When C>10%, it indicates that the correction is effective, and the correction is ended; when C≤10%, it indicates that the correction is invalid, and the step S1 is returned to re-collect data for correction.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] The present application automatically extracts feature parameters and performs pattern matching through a time-frequency synchronization analyzer, realizes the automation of synchronization error correction, and reduces the need for manual intervention.

[0045] The present application can avoid unnecessary correction operation, save resources and time, and realize fast and accurate correction of synchronization error in optical communication system by setting threshold value to determine whether correction is needed.

[0046] The present application can intuitively evaluate the correction effect by comparing the synchronization error values before and after correction, and ensure the effectiveness of correction. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0048] Figure 1 The method flowchart of the present application. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be described in detail below in combination with embodiments. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0050] Please refer to Figure 1 The first aspect embodiment of the present application provides an optical communication synchronization error correction method based on time-frequency synchronization analyzer, comprising the following steps:

[0051] S1: connecting the time-frequency synchronization analyzer to the optical communication system, and collecting the synchronization signal data in the optical communication system in real time through the time-frequency synchronization analyzer;

[0052] S2: pre-processing the collected synchronization signal data, including cleaning and standardization;

[0053] S3: extracting the characteristic parameters of the synchronization signal data and analyzing and identifying the type of the synchronization signal data; calculating the time offset, frequency offset, amplitude offset, pulse width offset and code rate offset according to the analysis result; and comprehensively analyzing the synchronization error value according to the calculation result;

[0054] S4: correcting the synchronization error according to the analysis result of the synchronization error value;

[0055] S5: comprehensively evaluating the correction result.

[0056] Specifically, by connecting the time-frequency synchronization analyzer with the optical communication system, the synchronization signal data is collected in real time; the collected synchronization signal data is preprocessed, including removing noise, outliers and repeated values; applying filtering and smoothing algorithms to improve quality; unifying format units and normalizing. The time-frequency synchronization analyzer can simultaneously receive Beidou satellite navigation system, GPS, IRIG-B(DC) code, PTP network time message and PPS_TOD ground-based time signal, generate pulse signals synchronized with UTC, IRIG-B time code, PPS_TOD time message, NTP / PTP network time message, ensure the effectiveness of time signal output, and provide stable, reliable and accurate time and frequency reference. The characteristic parameters of the synchronization signal data are extracted, and according to the characteristic modes of different types of signals pre-stored in the time-frequency synchronization analyzer, after the characteristic parameters of the synchronization signal data are extracted, the time-frequency synchronization analyzer matches the characteristic parameters with the pre-stored modes, automatically identifies the type of the accessed synchronization signal data, and displays the matching result on the liquid crystal display. The time is analyzed and calculated, and the synchronization error value is analyzed and calculated according to the calculation result. Whether to correct is judged through the synchronization error value analysis; when the correction is completed, the step S3 is repeated to calculate the synchronization error value after the correction is completed, and whether to correct is judged again, until the condition is met, and the correction is ended. According to the synchronization error values before and after correction, the correction result is comprehensively evaluated, and when the correction is effective, the correction is ended; otherwise, return to step S1 and correct again.

[0057] In one embodiment of the present application, the step S1 comprises the following steps:

[0058] By accessing GPS / BD dual-mode satellite signal, the time reference signal is obtained; simultaneously receiving Beidou satellite navigation system, GPS, IRIG-B(DC) code, PTP network time message and PPS_TOD ground-based time signal time signal source, collecting synchronization signal data in real time according to the time signal source, the synchronization signal data includes: pulse signals synchronized with UTC, IRIG-B time code, PPS_TOD time message, NTP / PTP network time message.

[0059] Specifically, the time-frequency synchronization analyzer adopts a flat panel operation mode, is compatible with GPS / BD dual-mode satellite signal access, can accurately measure time synchronization signals such as pulse signals, IRI G-B alternating current and direct current time codes, serial port time messages, SNTP network time messages and IEEE1588 precision network time synchronization messages, can reproduce high-precision UTC time and generate high-precision clocks as test references, can simultaneously receive Beidou satellite navigation system, GPS, IRI G-B(DC) code, PTP network time message and PPS_TOD ground time signals, generate pulse signals, IRI G-B time codes, PPS_TOD time messages, NTP / PTP network time messages synchronized with UTC, ensure the effectiveness of time signal output, and provide stable, reliable and accurate time and frequency references.

[0060] In one of the embodiments of the present application, the step S3 of extracting the characteristic parameters of the synchronization signal data and analyzing and identifying the type of the synchronization signal data comprises the following steps:

[0061] The collected and processed synchronization signal data is input into the time-frequency synchronization analyzer through the corresponding interface of the time-frequency synchronization analyzer, and the input synchronization signal data is subjected to filtering, amplification and shaping processing;

[0062] The time-frequency synchronization analyzer extracts the characteristic parameters of the input synchronization signal data, including the characteristic parameters of the pulse signal, such as frequency, amplitude and pulse width, the characteristic parameters of the IRI G-B time code, such as encoding format and code rate, and the characteristic parameters of the serial port time message and the network time message, such as data frame structure and time stamp.

[0063] The time-frequency synchronization analyzer pre-stores the characteristic modes of different types of signals in the internal, after extracting the characteristic parameters of the synchronization signal data, the time-frequency synchronization analyzer matches the characteristic parameters with the pre-stored modes, and automatically identifies the type of the input synchronization signal data;

[0064] Based on the results of the characteristic extraction and the mode matching, after the time-frequency synchronization analyzer identifies the type of the synchronization signal data, the display screen of the time-frequency synchronization analyzer displays the type and the characteristic parameters of the input synchronization signal data.

[0065] Specifically, the collected and processed synchronization signal data is input into the time-frequency synchronization analyzer through a corresponding interface of the time-frequency synchronization analyzer; the interface includes: an external antenna interface BNC, a level signal input and output interface, a message receiving and output interface SFP, an RJ45 interface and a USB interface; the input synchronization signal data is preprocessed as necessary, such as filtering, amplification, shaping, etc., to ensure that the signal quality meets the analysis requirements; the time-frequency synchronization analyzer extracts characteristic parameters from the processed signal, and the time-frequency synchronization analyzer internally pre-stores characteristic modes of different types of signals, after the characteristic parameters of the synchronization signal data are extracted, the time-frequency synchronization analyzer matches these parameters with the pre-stored modes, and automatically identifies the type of the accessed synchronization signal data. Based on the results of feature extraction and pattern matching, the time-frequency synchronization analyzer displays the type and characteristic parameters of the accessed synchronization signal data on its display screen.

[0066] In one embodiment of the present application, the time offset, frequency offset, amplitude offset, pulse width offset and code rate offset are analyzed and calculated according to the analysis results, including the following steps:

[0067] Through analysis formula: E T = |T signal -T base |

[0068] The time offset E T is obtained; wherein T base represents the time reference, and T signal represents the time stamp extracted from the synchronization signal data.

[0069] Through analysis formula:

[0070] The frequency offset E f is obtained; wherein f m represents the frequency of the pulse signal, and f b represents the standard frequency.

[0071] Through analysis formula:

[0072] The amplitude offset E A is obtained; wherein A m represents the amplitude of the pulse signal, and A b represents the standard amplitude.

[0073] Through analysis formula:

[0074] The pulse width offset E M is obtained; wherein M m represents the pulse width of the pulse signal, and M b represents the standard pulse width.

[0075] By analyzing the formula:

[0076] The code rate offset E is obtained R ; wherein R m represents the code rate of the IRIG-B time code, R b represents the standard code rate.

[0077] Specifically, by comparing the timestamp extracted from the synchronization signal data with the time reference, the time offset is obtained. By analyzing the difference between the frequency of the pulse signal and the standard frequency, the frequency offset is obtained. By comparing the amplitude of the pulse signal with the standard amplitude, the amplitude offset is obtained. By analyzing the difference between the pulse width of the pulse signal and the standard pulse width, the pulse width offset is obtained. By comparing the code rate of the IRIG-B time code with the standard code rate, the code rate offset is obtained.

[0078] In one embodiment of the present application, the synchronization error value is analyzed comprehensively according to the calculation results, including the following steps:

[0079] By analyzing the formula:

[0080] E = E T *w1 + E f *w2 + E A *w3 + E M *w4 + E R *w5

[0081] The synchronization error value E is obtained; wherein E T , E f , E A , E M and E R respectively represent the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset; w1, w2, w3, w4 and w5 respectively represent the weights corresponding to the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset.

[0082] Specifically, according to the feature parameters extracted from the synchronization signal data, the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset obtained by analysis and calculation are comprehensively analyzed by multiplying the corresponding weights to obtain the synchronization error value. The weight of the time offset is 0.4; the weight of the frequency offset is 0.3; the weight of the amplitude offset is 0.2; the weight of the pulse width offset is 0.05; and the weight of the code rate offset is 0.05. The actual weight should be determined according to the specific application scene, performance requirements and the influence of the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset on the actual application. In actual application, a large number of tests and data analysis may be needed to optimize these weight values to achieve the best synchronization effect.

[0083] In one embodiment of the present application, the step S4 comprises the following steps:

[0084] According to the synchronization error value, a threshold value is set, and the synchronization error value and the set threshold value ζ are analyzed to determine whether to correct;

[0085] When E≥ζ, it indicates that the synchronization error value exceeds the threshold value, and the synchronization signal data is corrected;

[0086] When E<ζ, it indicates that the synchronization error value does not exceed the threshold value, and no correction is needed;

[0087] According to the corrected synchronization signal data, step 3 is repeated to analyze whether the corrected synchronization signal data exceeds the threshold value; when the corrected synchronization signal data does not exceed the threshold value, it indicates that the correction is completed; otherwise, the correction is re-performed and the above steps are repeated until the synchronization signal data does not exceed the threshold value, and the correction is completed.

[0088] Specifically, according to the size of the synchronization error value and the threshold value, it is determined whether correction is needed, and the threshold value ζ is 50ns. The threshold value can be dynamically adjusted according to the actual application scene and historical data. When the synchronization error value exceeds the threshold value, the synchronization signal data is corrected; when the synchronization error value does not exceed the threshold value, no correction is needed; according to the corrected synchronization signal data, step 3 is repeated to re-analyze and calculate the corrected synchronization error value, and then analyze whether the corrected synchronization signal data exceeds the threshold value; when the corrected synchronization signal data does not exceed the threshold value, it indicates that the correction is completed; otherwise, the correction is re-performed and the above steps are repeated until the synchronization signal data does not exceed the threshold value, and the process is completed, and the correction is completed.

[0089] In one embodiment of the present application, the step S5 comprises the following steps:

[0090] By analyzing the formula:

[0091] obtaining a correction efficiency C; wherein, E before represents the synchronization error value before correction, E after represents the synchronization error value after correction;

[0092] When C>10%, it indicates that the correction is effective, and the correction ends; when C≤10%, it indicates that the correction is ineffective, and the process returns to step S1 to reacquire data for correction.

[0093] Specifically, the correction efficiency is obtained by comparing the synchronization error value before correction and the synchronization error value after correction, and finally multiplied by a percentage, which can more intuitively analyze the correction efficiency. By setting the threshold to 10%, when C>10%, it indicates that the correction is effective, and the correction process can be ended to save resources and time; when C≤10%, it indicates that the correction is ineffective, and the process returns to step S1 to reacquire data and re-correct. By calculating the correction efficiency, the effect of correction can be more accurately evaluated, thereby improving the overall correction accuracy.

[0094] The above examples are only used to illustrate the technical method of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical method of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical method of the present application.

Claims

1. A method for correcting synchronization errors in optical communications based on a time-frequency synchronous analyzer, characterized in that, The method comprises the following steps: S1: connecting a time-frequency synchronization analyzer to an optical communication system, and collecting synchronization signal data in the optical communication system in real time through the time-frequency synchronization analyzer; S2: preprocessing the collected synchronization signal data, including cleaning and standardization; S3: extracting characteristic parameters of the synchronization signal data and analyzing and identifying the type of the synchronization signal data; calculating time offset, frequency offset, amplitude offset, pulse width offset, and code rate offset according to the analysis result; and comprehensively analyzing the synchronization error value according to the calculation result; S4: correcting the synchronization error according to the analysis result of the synchronization error value; S5: comprehensively evaluating the correction result; comprehensively analyzing the synchronization error value according to the calculation result, comprising the following steps: by analyzing the formula: obtaining a synchronization error value ; wherein, , , , and represent a time offset, a frequency offset, an amplitude offset, a pulse width offset and a code rate offset, respectively; , , , and represent weights corresponding to the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset, respectively; The step S4 comprises the following steps: setting a threshold value according to the synchronization error value, analyzing the synchronization error value and the set threshold value to determine whether to correct; When the synchronization error value exceeds the threshold value, the synchronization signal data is corrected; When then it means that the synchronization error value does not exceed the threshold value and no correction is performed. According to the corrected synchronization signal data, and repeating step 3, whether the corrected synchronization signal data exceeds the threshold value is analyzed; when the corrected synchronization signal data does not exceed the threshold value, it indicates that the correction is completed; otherwise, the correction is re-performed and the above steps are repeated until the synchronization signal data does not exceed the threshold value, and the correction is ended.

2. The method for correcting synchronization error of optical communication based on time-frequency synchronization analyzer according to claim 1, characterized in that, The step S1 comprises the following steps: By accessing GPS / BD dual-mode satellite signals, a time reference signal is obtained; meanwhile, time signal sources of Beidou satellite navigation system, GPS, IRIG-B (DC) code, PTP network time message, and PPS_TOD ground time signal are received, and synchronization signal data is collected in real time according to the time signal sources, wherein the synchronization signal data includes pulse signals synchronized with UTC coordinated universal time, IRIG-B time code, PPS_TOD time message, and NTP / PTP network time message.

3. The method of claim 1, wherein the method further comprises: The step S3 comprises the following steps: The collected and processed synchronization signal data is input into the time-frequency synchronization analyzer through the corresponding interface of the time-frequency synchronization analyzer, and the input synchronization signal data is filtered, amplified, and shaped; The time-frequency synchronization analyzer extracts the characteristic parameters of the input synchronization signal data, including the characteristic parameters of the pulse signal: frequency, amplitude, and pulse width, the characteristic parameters of the IRIG-B time code: encoding format and code rate, and the characteristic parameters of the serial port time message and network time message: data frame structure and time stamp; The time-frequency synchronization analyzer internally pre-stores characteristic patterns of different types of signals, and after the characteristic parameters of the synchronization signal data are extracted, the time-frequency synchronization analyzer matches the characteristic parameters with the pre-stored patterns to automatically identify the type of the accessed synchronization signal data; Based on the results of characteristic extraction and pattern matching, after the time-frequency synchronization analyzer identifies the type of the synchronization signal data, the display screen of the time-frequency synchronization analyzer displays the type and characteristic parameters of the accessed synchronization signal data.

4. The method of claim 3, wherein the time-frequency synchronization analyzer is a time- frequency synchronization analyzer according to claim 1 or 2. According to the analysis result, the time offset, frequency offset, amplitude offset, pulse width offset, and code rate offset are calculated, comprising the following steps: By analyzing the formula: obtaining a time offset ; wherein, denotes a time reference, denotes a timestamp of the synchronization signal data extraction; By analyzing the formula: obtaining a frequency offset ; wherein, denotes the frequency of the pulse signal, denotes the standard frequency; By analyzing the formula: obtaining an amplitude offset ; wherein denotes the amplitude of the pulse signal, denotes the standard amplitude; By analyzing the formula: obtaining a pulse width offset ; wherein, represents a pulse width of the pulse signal, represents a standard pulse width; By analyzing the formula: obtaining a code rate offset ; wherein, denotes a code rate of the IRIG-B time code, denotes a standard code rate.

5. The method of claim 1, wherein the time-frequency synchronization analyzer is a time- frequency synchronization analyzer. The step S5 comprises the following steps: By analyzing the formula: corrected efficiency ; wherein, denotes the synchronization error value before correction, denotes the synchronization error value after correction; When , it indicates that the correction is valid and the correction is ended; when , it indicates that the correction is invalid and the data is collected again for correction in step S1.

6. The method of claim 1, wherein the time-frequency synchronization analyzer is a time- frequency synchronization analyzer. The method further comprises: According to the feature parameters extracted from the synchronization signal data, the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset are analyzed and calculated, and a synchronization error value is obtained by multiplying corresponding weights and performing comprehensive analysis.

7. The method of claim 1, wherein the method further comprises: determining a frequency offset between the received signal and the local oscillator signal; and adjusting the frequency of the local oscillator signal based on the determined frequency offset. The method further comprises: The weight of the time offset is 0.4; the weight of the frequency offset is 0.3; the weight of the amplitude offset is 0.2; the weight of the pulse width offset is 0.05; and the weight of the code rate offset is 0.

05.

8. The method of claim 1, wherein the time-frequency synchronization analyzer is a time- frequency synchronization analyzer. The method further comprises: The actual weight is determined according to the application scenario, the performance requirement, and the time offset, the frequency offset, the amplitude offset, the pulse width offset and the code rate offset.

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