Method and device for suppressing coherent fading noise of optical fiber sensing data

Abstract

The embodiment of the application discloses a coherent fading noise suppression method and device for optical fiber sensing data, and the method comprises the following steps: acquiring optical fiber sensing data before coherent fading noise suppression; determining a fading point amplitude threshold based on the optical fiber sensing data; determining a signal fading point based on the fading point amplitude threshold; performing signal interpolation processing on the optical fiber sensing data of the signal fading point to obtain a signal after coherent fading noise suppression; and performing phase demodulation and phase unwrapping processing on the signal after coherent fading noise suppression to obtain processed optical fiber sensing data. The original optical fiber sensing data collected is analyzed, the signal fading point of the optical fiber sensing data is determined by determining the fading point amplitude threshold, the original optical fiber sensing data is interpolated according to the signal fading point, the coherent fading problem of the optical fiber sensing data in the collection process is overcome, the accuracy of the collected optical fiber sensing data is improved, and the actual needs of technical personnel are met.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensing data processing, and in particular to a method for suppressing coherent fading noise of optical fiber sensing data, a device for suppressing coherent fading noise of optical fiber sensing data, a processor, and a computer-readable storage medium. Background Art

[0002] With the continuous development of science and technology, fiber optic sensing technology is increasingly being applied to various fields of life and production. Fiber optic distributed acoustic sensing technology, a detection technology based on the Rayleigh scattering principle of optical fiber, is widely used in technical fields such as well seismic data acquisition, dam safety monitoring, and security.

[0003] During the application process, the vibration information around the optical fiber is obtained through phase demodulation. The optical fiber serves as both a sensing medium and a transmission medium. It can continuously sense the acoustic vibration information around the optical fiber and record the relevant vibration or strain data through high-density time and space sampling.

[0004] In the existing technology, fiber-optic distributed acoustic sensing technology generally uses a phase-sensitive optical time-domain reflectometer to obtain the phase information of Rayleigh scattering through in-phase / quadrature phase demodulation. However, in actual applications, since the intensity and phase of Rayleigh scattering have random statistical characteristics in space and time, coherent fading will cause the phase noise levels of data collected at different locations to be inconsistent. Therefore, when the light intensity of Rayleigh scattering at some locations is weak due to coherent fading, the phase demodulation signal will have excessive phase noise that will drown out the valid signal, making it impossible to accurately detect external signals, thereby greatly reducing the accuracy of fiber-optic sensing and causing great trouble for technicians. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems existing in the prior art, an embodiment of the present invention provides a method for suppressing coherent fading noise of optical fiber sensing data. By analyzing the original optical fiber sensing data and determining the corresponding signal fading point, the optical fiber sensing data is automatically filled in by linear interpolation of adjacent normal points based on the signal fading point, thereby obtaining optical fiber sensing data after overcoming coherent fading, thereby improving the accuracy of optical fiber sensing data acquisition.

[0006] To achieve the above-mentioned objectives, an embodiment of the present invention provides a method for suppressing coherent fading noise in optical fiber sensing data, the method comprising: acquiring optical fiber sensing data before coherent fading noise suppression; determining a fading point amplitude threshold based on the optical fiber sensing data; determining a signal fading point based on the fading point amplitude threshold; performing signal interpolation processing on the optical fiber sensing data at the signal fading point to obtain a signal after coherent fading noise suppression; and performing phase demodulation and phase unwrapping processing on the signal after coherent fading noise suppression to obtain processed optical fiber sensing data.

[0007] Preferably, the optical fiber is arranged at the detected position to obtain the optical fiber sensing data before the coherent fading noise suppression, including: obtaining initial optical fiber sensing data detected at the detected position; performing direct current bias correction operation and amplitude and phase imbalance correction operation on the initial optical fiber sensing data to obtain corrected optical fiber sensing data; and taking the corrected optical fiber sensing data as the optical fiber sensing data before the coherent fading noise suppression.

[0008] Preferably, the fading point amplitude threshold is determined based on the optical fiber sensing data, including: determining a preset reference position; determining at least one set of reference optical fiber sensing data within a preset range of the preset reference position in the optical fiber sensing data; generating a corresponding amplitude-phase diagram based on the at least one set of reference optical fiber sensing data; determining phase divergence information of the at least one set of reference optical fiber sensing data based on the amplitude-phase diagram; and determining the fading point amplitude threshold based on the phase divergence information.

[0009] Preferably, the signal fading point is determined based on the fading point amplitude threshold, including: comparing the amplitude of each optical fiber sensing data with the fading point amplitude threshold in sequence; and determining the point corresponding to the optical fiber sensing data smaller than the fading point amplitude threshold as the signal fading point, and determining the point corresponding to the optical fiber sensing data greater than the fading point amplitude threshold as a normal point.

[0010] Preferably, the signal interpolation processing is performed on the optical fiber sensing data of the signal fading point to obtain the signal after the coherent fading noise suppression, including: performing signal interpolation processing on all fading points by an adjacent normal point interpolation method to obtain the signal after the coherent fading noise suppression.

[0011] Correspondingly, the application also provides a device for coherent fading noise suppression of optical fiber sensing data, including: an optical fiber sensing data acquisition unit, configured to acquire optical fiber sensing data before coherent fading noise suppression; a threshold determination unit, configured to determine a fading point amplitude threshold based on the optical fiber sensing data; a fading point determination unit, configured to determine a signal fading point based on the fading point amplitude threshold; a fading noise elimination unit, configured to perform signal interpolation processing on the optical fiber sensing data of the signal fading point to obtain a signal after coherent fading noise suppression; and a subsequent processing unit, configured to perform phase demodulation and phase unwrapping processing on the signal after coherent fading noise suppression to obtain processed optical fiber sensing data.

[0012] Preferably, the optical fiber is arranged at the detected position, and the optical fiber sensing data acquisition unit comprises: an initial optical fiber sensing data acquisition module, configured to acquire initial optical fiber sensing data at the detected position; a data correction module, configured to perform a direct current bias correction operation and an amplitude and phase imbalance correction operation on the initial optical fiber sensing data to obtain corrected optical fiber sensing data; and a data determination module, configured to take the corrected optical fiber sensing data as the optical fiber sensing data before suppression of the coherent fading noise.

[0013] Preferably, the threshold determination unit comprises: a reference position determination module, configured to determine a preset reference position; a reference information determination module, configured to determine at least one set of reference optical fiber sensing data within a preset range of the preset reference position in the optical fiber sensing data; a cross-plot generation module, configured to generate a corresponding amplitude-phase plot based on the at least one set of reference optical fiber sensing data; a phase divergence information determination module, configured to determine phase divergence information of the at least one set of reference optical fiber sensing data based on the amplitude-phase plot; and a threshold determination module, configured to determine the fading point amplitude threshold based on the phase divergence information.

[0014] Preferably, the fading point determination unit comprises: a comparison module, configured to compare the amplitude of each optical fiber sensing data with the fading point amplitude threshold in sequence; and a fading point determination module, configured to determine a point corresponding to the optical fiber sensing data smaller than the fading point amplitude threshold as a signal fading point, and determine a point corresponding to the optical fiber sensing data greater than the fading point amplitude threshold as a normal point.

[0015] Preferably, the fading noise elimination unit is configured to perform signal interpolation processing on all fading points by an adjacent normal point interpolation method to obtain a signal after suppression of the coherent fading noise.

[0016] In another aspect, the present application also provides a processor configured to execute the coherent fading noise suppression method for optical fiber sensing data provided by the present application.

[0017] In another aspect, the present application also provides a computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the coherent fading noise suppression method for optical fiber sensing data provided by the present application.

[0018] Through the technical solutions provided by the present application, the present application has at least the following technical effects:

[0019] The original optical fiber sensing data is analyzed in the collection process of the optical fiber sensing data, the signal fading point of the optical fiber sensing data is determined by determining the amplitude threshold of the fading point, and the original optical fiber sensing data is subjected to adjacent normal point interpolation according to the signal fading point, so that the coherent fading noise problem of the optical fiber sensing data in the collection process is effectively overcome, the accuracy of the collected optical fiber sensing data is improved, and the actual needs of technical personnel are met.

[0020] Other features and advantages of the embodiments of the present application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific implementation to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the drawings:

[0022] Figure 1 is a specific implementation flowchart of the coherent fading noise suppression method for optical fiber sensing data provided by the embodiments of the present application;

[0023] Figure 2 is a DAS data demodulation phase diagram which is not subjected to coherent fading noise suppression in the coherent fading noise suppression method for optical fiber sensing data provided by the embodiments of the present application;

[0024] Figure 3 is a specific implementation flowchart of determining the amplitude threshold of the fading point in the coherent fading noise suppression method for optical fiber sensing data provided by the embodiments of the present application;

[0025] Figure 4 is an amplitude-phase diagram in the coherent fading noise suppression method for optical fiber sensing data provided by the embodiments of the present application;

[0026] Figure 5 is a specific implementation flowchart of determining the signal fading point in the coherent fading noise suppression method for optical fiber sensing data provided by the embodiments of the present application;

[0027] Figure 6 is a DAS data demodulation phase diagram after coherent fading noise suppression in the coherent fading noise suppression method for optical fiber sensing data provided by the embodiments of the present application;

[0028] Figure 7 is a structural schematic diagram of the coherent fading noise suppression device for optical fiber sensing data provided by the embodiments of the present application. DETAILED DESCRIPTION

[0029] The specific implementation of the embodiments of the present application is described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiments of the present application, and is not used to limit the embodiments of the present application.

[0030] The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" means two or more, and in view of this, "multiple" can also be understood as "at least two" in the embodiments of the present application. "And / or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / ", if not specially stated, generally represents that the associated objects before and after it are in an "or" relationship. In addition, it should be understood that in the description of the embodiments of the present application, "first", "second", and the like are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0031] Please refer to Figure 1 The embodiments of the present application provide a method for suppressing coherent fading noise of optical fiber sensing data, the method comprises:

[0032] S10) obtaining optical fiber sensing data before suppressing coherent fading noise;

[0033] S20) determining a fading point amplitude threshold based on the optical fiber sensing data;

[0034] S30) determining a signal fading point based on the fading point amplitude threshold;

[0035] S40) performing signal interpolation processing on the optical fiber sensing data of the signal fading point to obtain a signal after suppressing coherent fading noise;

[0036] S50) performing phase demodulation and phase unwrapping processing on the signal after suppressing coherent fading noise to obtain processed optical fiber sensing data.

[0037] In the process of collecting optical fiber sensing data, the optical fiber is laid to the detected position and fully coupled, and a DAS (Distributed Acoustic Sensor) is connected to one end of the optical fiber. The DAS instrument transmits a laser pulse, and the IQ (In-phase / Quadrature) signal of the Rayleigh scattering of the optical pulse is obtained by a coherent detection method. After phase demodulation of the signal, the corresponding optical fiber sensing data is obtained. However, in the prior art, the data obtained by directly performing phase demodulation processing on the optical fiber sensing data has a large noise, which cannot meet the actual needs of the technical personnel, for example, please refer to Figure 2The DAS data demodulation phase diagram provided by the embodiment of the present application is not subjected to coherent fading noise suppression, and therefore the optical fiber sensing data obtained is optimized to solve the technical problems in the prior art.

[0038] In a possible implementation, the optical fiber sensing data before coherent fading noise suppression is first obtained, the optical fiber sensing device is an instrument with a phase-sensitive optical time domain reflectometer as the core, and the optical fiber sensing device is arranged at a detection position. In the process of obtaining the optical fiber sensing data, the initial optical fiber sensing data detected at each detection position is first obtained, the initial optical fiber sensing data is the IQ signal, then the direct current bias correction operation and the amplitude and phase imbalance correction operation are performed on the initial optical fiber sensing data to obtain the corrected IQ signal, and the corrected information is the IQ information output I(i,j) and Q(i,j) of different observation points at different times, where i represents the i-th sampling time of the optical fiber sensing device, and j represents the serial number of the j-th detection position. According to the IQ information, the amplitude A and the direct phase ω0 of the optical fiber sensing data can be calculated, and the specific representation is as follows: At this time, the corrected IQ signal can be used as the optical fiber sensing data before coherent fading noise suppression. Then the fading point amplitude threshold is further obtained.

[0039] Please refer to Figure 3 In the embodiment of the present application, the fading point amplitude threshold is determined based on the optical fiber sensing data, which includes:

[0040] S21) determining a preset reference position;

[0041] S22) determining at least one set of reference optical fiber sensing data in a preset range of the preset reference position in the optical fiber sensing data;

[0042] S23) generating a corresponding amplitude-phase diagram based on the at least one set of reference optical fiber sensing data;

[0043] S24) determining the phase divergence information of the at least one set of reference optical fiber sensing data based on the amplitude-phase diagram;

[0044] S25) determining the fading point amplitude threshold based on the phase divergence information.

[0045] In a possible implementation, after the collected optical fiber sensing data is obtained, the optical fiber sensing data is statistically analyzed, a preset reference position is first determined, the preset reference position is the middle position j0 of the optical fiber to be measured, at this time, n depth points are determined in a preset range of the middle position j0, and at least one set of reference optical fiber sensing data of the n depth points is extracted, the n is a positive integer greater than 0, at this time, a corresponding amplitude-phase diagram is generated according to the amplitude A and the phase ω of the optical fiber sensing data, please refer toFigure 4 ω is a demodulation phase obtained by spatial difference or global phase demodulation according to ω0. At this time, the phase divergence trend of all points of the amplitude-phase diagram is analyzed, the area of obvious phase divergence is determined in the phase divergence trend information, and the value corresponding to the intersection of the obvious phase divergence area and the non-obvious phase divergence area is determined as the fading point amplitude threshold.

[0046] In the embodiment of the application, by adopting a graphical-based manner to analyze the phase divergence trend of the optical fiber sensing data, the area where the trend changes obviously can be effectively identified, the accuracy of trend analysis is improved, and the value corresponding to the point where the phase divergence trend changes obviously is taken as the fading point amplitude threshold, which can effectively improve the effect of subsequent coherent fading noise suppression and improve the accuracy of noise suppression. After determining the fading point amplitude threshold, the signal fading point is further determined.

[0047] Please refer to Figure 5 In the embodiment of the application, the signal fading point is determined based on the fading point amplitude threshold, comprising:

[0048] S31) comparing the amplitude of each optical fiber sensing data with the fading point amplitude threshold in sequence;

[0049] S32) determining the point corresponding to the optical fiber sensing data smaller than the fading point amplitude threshold as the signal fading point, and determining the point corresponding to the optical fiber sensing data larger than the fading point amplitude threshold as the normal point.

[0050] For example, in a possible implementation, the fading point amplitude threshold calculated above is used to calculate each optical fiber sensing data point by point, and the points smaller than the fading point amplitude threshold are obtained as the signal fading points, and the points corresponding to the remaining information are taken as the normal points. At this time, the optical fiber sensing data corresponding to the above signal fading points are further linearly interpolated by using adjacent normal point data, so as to realize the fading noise suppression of the optical fiber sensing data corresponding to each signal fading point.

[0051] In the embodiment of the application, by accurately identifying the signal fading point in the process of collecting the optical fiber sensing data, and interpolating the optical fiber sensing data collected by each signal fading point by using adjacent normal points, the influence of coherent fading on normal optical fiber sensing data is effectively overcome, the accuracy of the collected optical fiber sensing data is effectively improved, and the accuracy of subsequent data analysis is improved. After the interpolation processing of the signal, further phase demodulation and phase unwrapping processing are performed, so as to obtain the final optical fiber sensing data. Please refer to Figure 6 The DAS data demodulation phase diagram after coherent fading noise suppression provided by the embodiment of the application.

[0052] After the above-processed optical fiber sensing data is acquired, it is easy for those skilled in the art to know that, according to actual needs, the optical fiber sensing data acquired by artificial seismic source excitation or microseismic monitoring can also be subjected to the above steps to obtain corresponding processed optical fiber sensing data, and more accurate optical fiber sensing data processing can be realized by combining subsequently obtained processed optical fiber sensing data, so as to provide accurate data support for subsequent seismic data processing and calculation and meet the actual needs of technical personnel.

[0053] The coherent fading noise suppression device for optical fiber sensing data provided by the embodiment of the present application will be described below in combination with the accompanying drawings.

[0054] Please refer to Figure 7 , based on the same inventive concept, the embodiment of the present application provides a coherent fading noise suppression device for optical fiber sensing data, which comprises: an optical fiber sensing data acquisition unit for acquiring optical fiber sensing data before coherent fading noise suppression; a threshold determination unit for determining a fading point amplitude threshold based on the optical fiber sensing data; a fading point determination unit for determining a signal fading point based on the fading point amplitude threshold; a fading noise elimination unit for performing signal interpolation processing on the optical fiber sensing data of the signal fading point to obtain a signal after coherent fading noise suppression; and a subsequent processing unit for performing phase demodulation and phase unwrapping processing on the signal after coherent fading noise suppression to obtain processed optical fiber sensing data.

[0055] In the embodiment of the present application, the optical fiber is arranged at a detected position, the optical fiber sensing data acquisition unit comprises: an initial optical fiber sensing data acquisition module for acquiring initial optical fiber sensing data detected at the detected position; a data correction module for performing direct current bias correction operation and amplitude and phase imbalance correction operation on the initial optical fiber sensing data to obtain corrected optical fiber sensing data; and a data determination module for taking the corrected optical fiber sensing data as the optical fiber sensing data before coherent fading noise suppression.

[0056] In the embodiment of the present application, the threshold determination unit comprises: a reference position determination module for determining a preset reference position; a reference information determination module for determining at least one set of reference optical fiber sensing data within a preset range of the preset reference position in the optical fiber sensing data; a cross-plot generation module for generating a corresponding amplitude-phase plot based on the at least one set of reference optical fiber sensing data; a phase divergence information determination module for determining phase divergence information of the at least one set of reference optical fiber sensing data based on the amplitude-phase plot; and a threshold determination module for determining a fading point amplitude threshold based on the phase divergence information.

[0057] In the embodiment of the present application, the fading point determination unit comprises a comparison module, configured to compare the amplitude of each optical fiber sensing data with the fading point amplitude threshold in sequence; and a fading point determination module, configured to determine the point corresponding to the optical fiber sensing data smaller than the fading point amplitude threshold as a signal fading point, and determine the point corresponding to the optical fiber sensing data greater than the fading point amplitude threshold as a normal point.

[0058] In the embodiment of the present application, the fading noise elimination unit is configured to perform signal interpolation processing on all fading points by using an adjacent normal point interpolation method, to obtain a signal after coherent fading noise suppression.

[0059] Further, the embodiment of the present application also provides a processor configured to execute the coherent fading noise suppression method for optical fiber sensing data according to the present application.

[0060] Further, the embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the coherent fading noise suppression method for optical fiber sensing data according to the present application.

[0061] The optional embodiments of the embodiment of the present application are described in detail above in combination with the drawings, however, the embodiment of the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the embodiment of the present application within the technical concept of the embodiment of the present application, and these simple modifications all belong to the protection scope of the embodiment of the present application.

[0062] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the embodiment of the present application.

[0063] Those skilled in the art can understand that all or part of the steps of the methods described in the above embodiments can be completed by a program instructing related hardware. The program is stored in a storage medium, and includes a plurality of instructions for causing a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0064] In addition, various different embodiments of the embodiment of the present application can also be combined in any appropriate manner, as long as they do not contradict the technical concept of the embodiment of the present application, and they should be considered as disclosed in the embodiment of the present application.

Claims

1. A method for suppressing coherent fading noise of optical fiber sensing data, characterized in that: The method comprises: Obtaining optical fiber sensing data before coherent fading noise suppression; Determine the fading point amplitude threshold based on optical fiber sensing data, including: determining a preset reference position; determining, from the optical fiber sensing data, at least one set of reference optical fiber sensing data within a preset range of a preset reference position; generating a corresponding amplitude-phase diagram based on the at least one set of reference optical fiber sensing data; determining phase divergence information of the at least one set of reference optical fiber sensing data based on the amplitude-phase diagram; Determining a fading point amplitude threshold based on signal phase divergence information; determining a signal fading point based on a fading point amplitude threshold; Perform signal interpolation processing on the optical fiber sensing data at the signal fading point to obtain the signal after coherent fading noise suppression, including: Perform signal interpolation processing on all signal fading points by using the adjacent normal point interpolation method to obtain the signal after coherent fading noise suppression; Phase demodulation and phase unwrapping processing are performed on the signal after coherent fading noise suppression to obtain processed optical fiber sensing data.

2. The method according to claim 1, characterized in that The optical fiber is arranged at the detected position to obtain optical fiber sensing data before coherent fading noise suppression, including: Acquiring initial optical fiber sensing data at the detected location; Performing a DC bias correction operation and an amplitude and phase imbalance correction operation on the initial optical fiber sensing data to obtain corrected optical fiber sensing data; The corrected optical fiber sensing data is used as the optical fiber sensing data before coherent fading noise suppression.

3. The method according to claim 2, characterized in that Determine the signal fading point based on the fading point amplitude threshold, including: Comparing the amplitude of each optical fiber sensing data with the fading point amplitude threshold in turn; The point corresponding to the optical fiber sensing data with a magnitude smaller than the fading point amplitude threshold is determined as a signal fading point, and the point corresponding to the optical fiber sensing data with a magnitude larger than the fading point amplitude threshold is determined as a normal point.

4. A device for suppressing coherent fading noise of optical fiber sensing data, characterized in that: The device comprises: An optical fiber sensing data acquisition unit, used for acquiring optical fiber sensing data before coherent fading noise suppression; A threshold determination unit is used to determine a fading point amplitude threshold based on the optical fiber sensing data, the threshold determination unit comprising: A reference position determination module, used to determine a preset reference position; a reference information determining module, configured to determine, from the optical fiber sensing data, at least one set of reference optical fiber sensing data within a preset range of a preset reference position; a cross-plot generation module, configured to generate a corresponding amplitude-phase plot based on the at least one set of reference optical fiber sensing data; a phase divergence information determining module, configured to determine the phase divergence information of the at least one set of reference optical fiber sensing data based on the amplitude-phase diagram; A threshold determination module, configured to determine a fading point amplitude threshold based on phase divergence information; a fading point determination unit, configured to determine a signal fading point based on a fading point amplitude threshold; The fading noise elimination unit is used to perform signal interpolation processing on the optical fiber sensing data at the signal fading point to obtain the signal after the coherent fading noise is suppressed, including: Perform signal interpolation processing on all signal fading points by using the adjacent normal point interpolation method to obtain the signal after coherent fading noise suppression; The subsequent processing unit is used to perform phase demodulation and phase unwrapping processing on the signal after the coherent fading noise is suppressed to obtain processed optical fiber sensing data.

5. The device according to claim 4, characterized in that The optical fiber is arranged at the detected position, and the optical fiber sensing data acquisition unit includes: An initial optical fiber sensing data acquisition module is used to acquire initial optical fiber sensing data detected at a detected position; A data correction module is used to perform a DC bias correction operation and an amplitude and phase imbalance correction operation on the initial optical fiber sensing data to obtain corrected optical fiber sensing data; The data determination module is used to use the corrected optical fiber sensing data as the optical fiber sensing data before coherent fading noise suppression.

6. The device according to claim 5, characterized in that The fading point determination unit includes: A comparison module, for sequentially comparing the amplitude of each optical fiber sensing data with a fading point amplitude threshold; The fading point determination module is used to determine the point corresponding to the optical fiber sensing data less than the fading point amplitude threshold as the signal fading point, and determine the point corresponding to the optical fiber sensing data greater than the fading point amplitude threshold as the normal point.

7. A processor, characterized in that: The method is configured to execute the coherent fading noise suppression method for optical fiber sensing data as claimed in any one of claims 1 to 3.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for suppressing coherent fading noise of optical fiber sensing data as claimed in any one of claims 1 to 3 is implemented.

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