Submarine cable fault positioning system based on underwater beacons

Abstract

The invention relates to the technical field of submarine cable fault positioning, in particular to a submarine cable fault positioning system based on underwater beacons. The method comprises the steps that an underwater acoustic beacon array unit monitors and collects submarine cable fault sound wave signals in real time based on underwater acoustic beacons; the fault signal processing analysis unit extracts submarine cable fault sound wave signal parameters based on a non-point source space sound source waveform analysis model, and generates multi-parameter fault sound source feature vectors; the sound source positioning analysis algorithm unit performs three-dimensional inversion positioning based on the multi-parameter fault sound source feature vector and the arrival time difference of the submarine cable fault sound wave signal to the underwater acoustic beacon, and obtains the spatial position information of the submarine cable fault point; and the data communication alarm management unit sends the spatial position information of the submarine cable fault point to a shore-based operation and maintenance system. The submarine cable fault positioning method is used for realizing a submarine cable fault positioning technology for quickly and accurately positioning and identifying spatial extension characteristics in a complex submarine environment.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable fault location, and in particular to a submarine cable fault location system based on underwater beacons. Background Art

[0002] Submarine cables, as critical infrastructure for transoceanic communications and offshore power transmission, are crucial for energy networks and communication systems. Since submarine cables are often laid in deep waters, complex terrain, or areas with high sediment loads, faults are not only difficult to locate but can also lead to serious consequences such as communication outages, power islanding, or system-level failures. Currently, electrical ranging, fiber-optic OTDR ranging, or ROV visual inspections are commonly used to locate submarine cable faults. However, in conditions of poor visibility, turbulent water flow, or deep cable burial depths, these methods are often inefficient, subject to significant errors, and unable to achieve rapid and accurate positioning.

[0003] Existing underwater acoustic positioning methods are mostly based on the ideal point sound source model for triangulation ranging calculations, ignoring the fact that the sound source in the actual submarine cable fault process often has non-point source expansion characteristics, that is, there is obvious ductility in space, and in time it manifests as a continuous discharge process of more than several milliseconds. In addition, the speed of sound in seawater varies greatly with depth, salinity, and temperature. Insufficient beacon clock synchronization accuracy will also lead to cumulative errors in arrival time difference measurements, thereby affecting positioning accuracy and making it easy to have misidentification and mispositioning problems under complex sound field conditions. Especially in deep-sea environments or complex terrain conditions, traditional methods have difficulty accurately capturing the spatial distribution characteristics of the fault sound source and cannot effectively distinguish between cable faults and surrounding environmental noise interference, which seriously restricts the rapid positioning and emergency repair efficiency of submarine cable faults. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a submarine cable fault location system based on underwater beacons to solve the problem that the existing underwater acoustic positioning method proposed in the above-mentioned background technology is prone to misidentification and mislocation under complex sound field conditions.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A submarine cable fault location system based on underwater beacons, comprising: An underwater acoustic beacon array unit is used to monitor and collect acoustic wave signals of submarine cable faults in real time through underwater acoustic beacons; a fault signal processing and analysis unit, configured to extract submarine cable fault sound wave signal parameters from the submarine cable fault sound wave signal through a non-point source spatial sound source waveform analysis model, and then generate a multi-parameter fault sound source feature vector; The sound source localization analysis algorithm unit is used to calculate the time difference between the acoustic wave signal of the submarine cable fault and the underwater acoustic beacon, and calculate the spatial location information of the submarine cable fault point based on the multi-parameter fault sound source feature vector as a constraint; The data communication alarm management unit is used to transmit the spatial location information of the submarine cable fault point to the shore-based operation and maintenance system.

[0006] A further improvement of the present invention is: Preferably, the underwater acoustic beacon comprises a plurality of underwater acoustic beacon devices arranged at equal intervals along the cable, and each underwater acoustic beacon device is equipped with a broadband hydrophone.

[0007] Preferably, the underwater acoustic beacon device is provided with a high-precision clock module, and the wide-band hydrophone is provided with a local data cache module and a high-precision clock module; all the underwater acoustic beacon devices and wide-band hydrophones perform acoustic intercommunication through a time synchronization protocol.

[0008] Preferably, the fault signal processing and analysis unit includes a signal preprocessing module, a feature extraction module and a feature vector generation module; The signal preprocessing module is used to preprocess the fault sound wave signal to filter out noise; The feature extraction module is used to extract acoustic wave signal parameters from the preprocessed fault acoustic wave signal; The feature vector generating module is used to generate a multi-parameter fault sound source feature vector according to the fault sound wave signal parameters.

[0009] Preferably, the feature extraction module extracts the submarine cable fault sound wave signal parameters based on the submarine cable fault sound wave signal through a non-point source space sound source waveform analysis model; the non-point source space sound source waveform analysis model is: (1) in, is the space coordinate vector; The starting time of the sound; is the time envelope function; is a unit step function; is the spatial distribution function.

[0010] Preferably, the submarine cable fault acoustic wave signal parameters include spectrum broadening, signal duration, and signal main frequency displacement.

[0011] Preferably, the multi-parameter fault sound source feature vector is: (5) in, is the multi-parameter fault sound source feature vector; To broaden the spectrum; is the duration of the signal; is the signal main frequency displacement; is the integral value of sound energy density per unit time; is the standard deviation of the time distribution of the acoustic signal envelope.

[0012] Preferably, the specific process of the sound source positioning analysis algorithm unit calculating the spatial position of the submarine cable fault point is: according to the reception time and energy distribution of the submarine cable fault sound wave signal at each underwater acoustic beacon, the spatial position information and the sound expansion scale of the fault sound wave signal are calculated, and the spatial position information and the sound source spatial ductility parameter are output.

[0013] Preferably, the sound source spatial extensibility parameters include the spatial sound radius, main expansion direction vector and sound duration range of the fault sound wave signal; The spatial location information includes the three-dimensional coordinate position of the submarine cable fault point, the corresponding water depth value and the location reliability score.

[0014] Preferably, the data communication alarm management unit is further used to generate an alarm event record, and the alarm event record is used to record the spatial center position information of the fault sound wave signal and the sound source spatial ductility parameter.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present application provides a submarine cable fault location system based on underwater beacons. The system collects fault sound wave signals in real time through an underwater acoustic beacon array, extracts multi-parameter feature vectors in combination with a non-point source model, and performs three-dimensional inversion positioning. This solves the problem of low positioning accuracy of traditional methods in complex sound fields, and has the advantage of improving the accuracy and efficiency of fault location in complex deep-sea environments. The positioning system of the present invention extracts spatial sound source distribution characteristics based on a non-point source spatial sound source waveform analysis model, and can characterize the sound wave characteristics of the submarine cable fault sound source in the process of spatial extension and time domain evolution, improve the adaptability to complex fault waveforms, and thus effectively avoid misjudgment or deviation caused by the traditional point source hypothesis. Through the arrival time difference and three-dimensional inversion positioning of multiple acoustic beacons, the extended center coordinates and the sound scale of the submarine cable fault point can be jointly calculated, thereby improving the spatial accuracy of fault location. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a block diagram of the submarine cable fault location system of the present invention; Among them: 1. Underwater acoustic beacon array unit; 2. Fault signal processing and analysis unit; 21. Signal preprocessing module; 22. Feature extraction module; 23. Feature vector generation module; 3. Sound source positioning analysis algorithm unit; 4. Data communication alarm management unit. DETAILED DESCRIPTION

[0017] Hereinafter, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Thus, a feature identified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of such features.

[0018] The co-shooting method provided in the embodiments of the present application can be applied to terminal devices such as mobile phones, tablet computers, wearable devices, vehicle-mounted devices, augmented reality (AR) / virtual reality (VR) devices, laptop computers, ultra-mobile personal computers (UMPCs), netbooks, and personal digital assistants (PDAs). The embodiments of the present application do not impose any restrictions on the specific types of terminal devices.

[0019] It should be noted that the terms "first," "second," and the like in the description and drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0020] like Figure 1 As shown, the present invention provides a submarine cable fault location system based on underwater beacons, comprising: The underwater acoustic beacon array unit 1 is based on underwater acoustic beacons laid along the seabed cables to monitor and collect the fault acoustic wave signals of the seabed cables in real time.

[0021] The fault signal processing and analysis unit 2 extracts the submarine cable fault sound wave signal parameters based on the non-point source spatial sound source waveform analysis model, extracts the spatial sound source distribution characteristics, and generates a multi-parameter fault sound source feature vector.

[0022] The sound source positioning analysis algorithm unit 3 performs three-dimensional inversion positioning based on the multi-parameter fault sound source feature vector and the arrival time difference of the submarine cable fault sound wave signal to the underwater acoustic beacon to obtain the spatial position information of the submarine cable fault point.

[0023] The data communication alarm management unit 4 sends the spatial location information of the submarine cable fault point to the shore-based operation and maintenance system through the offshore relay device, and generates a fault alarm event record.

[0024] Underwater acoustic beacon array units are deployed along the path of the submarine cable. When the cable experiences insulation breakdown or mechanical damage, the acoustic wave signal generated by the discharge at the fault point is captured synchronously by multiple beacons. After the fault signal processing and analysis unit performs bandpass filtering and noise suppression on the original signal, it extracts characteristic parameters such as spectrum broadening and main frequency displacement through the non-point source model to form a characteristic vector that characterizes the spatial distribution of the sound source. Based on the characteristic vector, the sound source positioning analysis algorithm unit combines the coordinate position of each beacon and the signal arrival time difference, and uses a three-dimensional inversion algorithm to calculate the spatial coordinates of the fault point, while evaluating the extension range and direction of the sound source. The data communication alarm management unit uploads the positioning results to the shore-based system through the sea surface relay device, triggering the operation and maintenance response process.

[0025] In this embodiment, the underwater acoustic beacon array unit 1 includes a plurality of underwater acoustic beacon devices with preset coordinates, and the underwater acoustic beacon devices are arranged at equal density along the submarine cable laying path, and each underwater acoustic beacon device is equipped with a wide-band hydrophone for real-time collection of submarine cable fault acoustic wave signals generated by submarine cable fault discharge.

[0026] Specifically, an underwater acoustic beacon is a special device that uses acoustic signals to locate underwater targets. It is used to emit sound wave signals of a specific frequency. When the beacon is activated by water, the internal water-sensitive switch is activated, driving the beacon to emit ultrasonic pulses at a specific frequency; a wide-band hydrophone is a device used to effectively receive underwater acoustic signals within a wide frequency range.

[0027] In this embodiment, all underwater acoustic beacons include a local data cache module and a high-precision clock module, and perform acoustic intercommunication through a time synchronization protocol to synchronize the acoustic time network; Among them, the high-precision clock module is used to provide a unified time reference for acoustic signal sampling. Specifically, it can be implemented using a GPS synchronized clock or a rubidium atomic clock to ensure that the sampling time of each underwater acoustic beacon is strictly synchronized and eliminate the signal time difference error caused by clock drift.

[0028] A time synchronization protocol refers to a communication protocol used to coordinate the clocks of multiple devices. It can be implemented using the IEEE 1588 precision time protocol or a two-way acoustic pulse synchronization method. By periodically exchanging time calibration signals, the clock deviation of all underwater acoustic beacons can be controlled within the microsecond level.

[0029] In this embodiment, the fault signal processing and analysis unit 2 includes a signal preprocessing module 21, a feature extraction module 22 and a feature vector generation module 23; The signal preprocessing module 21 is used to perform bandpass filtering, normalization and noise elimination on the sound wave signals collected by each underwater acoustic beacon, so as to remove background ocean noise, low-frequency water flow interference and high-frequency random disturbance.

[0030] In this embodiment, the feature extraction module 22 extracts the submarine cable fault acoustic wave signal parameters based on the submarine cable fault acoustic wave signal using a non-point source spatial acoustic source waveform analysis model. In this embodiment, the specific method for constructing the non-point source spatial acoustic source waveform analysis model is as follows: Based on the acoustic wave signal of submarine cable fault Construct a signal set and construct a spatial distribution function using the Gaussian spatial expansion model , we get the non-point source spatial sound source waveform analysis model, which is as follows: (1) in, is the space coordinate vector; The starting time of the sound; is the time envelope function; is a unit step function.

[0031] In this embodiment, the spatial distribution function The specific expression is as follows: (2) in, is the center coordinate of the sound source, indicating the spatial extension center position of the fault sound source; is the maximum sound source amplitude, indicating the maximum intensity of the sound source at the center point; is the spatial Euclidean distance, which represents the distance from the target point to the center of the sound source; It is the spatial expansion scale, indicating the spatial diffusion radius of the fault sound source, and is used to describe whether the sound source is point-shaped, line-shaped, or surface-shaped.

[0032] In the waveform analysis model of non-point source spatial sound source, the time envelope function Used to describe the waveform of the sound source over time, such as Gaussian pulse, exponential decay; unit step function Limit the sound source to Time is 0, When it is 1, it is used to define the starting point of the sound.

[0033] The submarine cable fault acoustic wave signal is processed using a non-power source spatial sound source waveform analysis model to obtain the spatial distribution function and temporal envelope function of the submarine cable fault acoustic wave signal, thereby obtaining the submarine cable fault acoustic waveform. The submarine cable fault acoustic signal parameters are then extracted from the submarine cable fault acoustic waveform. The non-point source spatial sound source waveform analysis model combines the spatial distribution function with the temporal envelope function to construct a mathematical model that can simultaneously reflect the spatial extension and temporal persistence characteristics of the sound source. This embodiment introduces a non-point source analysis model and combines it with parameters such as main frequency displacement, spectrum broadening, and duration to effectively distinguish the acoustic characteristics generated by different fault types. For example, insulation breakdown and mechanical fracture each correspond to different main frequency offset patterns, thereby avoiding misidentification of an extended sound source as a single point sound source. By quantifying parameters such as the signal's main frequency displacement and spectrum broadening, the ability to identify complex fault sound sources is significantly improved, providing physically meaningful feature inputs for subsequent three-dimensional positioning algorithms and reducing the probability of mislocation.

[0034] Among them, the acoustic wave signal parameters of submarine cable faults include spectrum broadening, signal duration, and signal main frequency displacement.

[0035] The spectrum broadening is the extended width of the fault signal spectrum relative to the background noise. Perform short-time Fourier transform (STFT) to obtain the spectrum , calculate the mean of the background noise spectrum and standard deviation Spectral broadening is defined as the frequency at which the fault signal exceeds the background noise. The frequency range is as follows: (3) The signal duration is the effective duration of the fault sound wave. The calculation process is based on the time envelope function , use Gaussian fitting or exponential decay model to fit the signal envelope, and the duration is the time required for the envelope amplitude in the signal envelope to drop to 1 / e times the maximum amplitude: The signal main frequency displacement is defined as follows: (4) in, is the signal main frequency displacement; It is the acoustic wave signal of submarine cable fault; For time; Acoustic signal for submarine cable faults The Fourier transform result of It is the standard background frequency.

[0036] In this embodiment, the feature vector generation module 23 constructs a multi-parameter fault sound source feature vector based on the submarine cable fault sound wave signal parameters: (5) in, is the multi-parameter fault sound source feature vector; To broaden the spectrum; is the duration of the signal; is the signal main frequency displacement; is the integral value of sound energy density per unit time; is the standard deviation of the time distribution of the acoustic signal envelope.

[0037] In this embodiment, the integral value of the acoustic energy density per unit time is is defined as follows: (6) in, The starting time of the interval for collecting acoustic wave signals of submarine cable faults; The end time of the submarine cable fault acoustic wave signal collection time interval; to It is a unit time for collecting acoustic wave signals of submarine cable fault.

[0038] In this embodiment, the standard deviation of the acoustic envelope time distribution is Describes the degree of diffusion of the signal envelope on the time axis. The calculation process is to first extract the signal envelope, calculate the mean and standard deviation of the envelope, and the calculation formula is: (7) Where N is the total number of samples, is the signal envelope, is the mean of the envelope.

[0039] In this embodiment, the sound source localization analysis algorithm unit 3 performs three-dimensional positioning calculation based on the arrival time difference of the submarine cable fault sound wave signal between multiple underwater acoustic beacons based on the multi-parameter fault sound source feature vector to obtain the spatial position information of the submarine cable fault point.

[0040] In this embodiment, the sound source localization analysis algorithm unit 3 calculates the spatial center position and sound expansion scale of the fault sound source based on the reception time and energy distribution of the submarine cable fault sound wave signal at each underwater acoustic beacon, and outputs a positioning result including spatial position information and sound source spatial ductility parameters; wherein the sound source spatial ductility parameters include the spatial sound radius, main expansion direction vector and sound duration range of the fault sound source.

[0041] Specifically, each underwater acoustic beacon first synchronizes the time reference through a high-precision clock module, measures the moment when the fault sound wave signal reaches itself, and converts the time difference into a distance difference. Based on the distance difference, a set of hyperbolas is obtained, and the fault point is located at the intersection of the hyperbolas. Combined with the multi-parameter fault sound source feature vector, the frequency domain, time domain and energy characteristics of the sound source are provided as vector constraints to construct a three-dimensional inversion positioning model. After solving, the three-dimensional coordinates and water depth z of the fault point are obtained. Further, the positioning confidence score is generated through residual calculation and parameter consistency to obtain the final spatial position information.

[0042] Among them, the spatial location information includes the three-dimensional coordinate position of the submarine cable fault point, the corresponding water depth value and the location confidence score.

[0043] Assume the coordinates of the fault point are , the coordinates of the i-th beacon are , the speed of sound is v, and the signal arrival time difference is , then the hyperbolic equation representing the distance difference is: (8) The constraints of the multi-parameter eigenvector include frequency domain matching terms, time domain matching terms and energy matching terms.

[0044] Among the frequency domain matching items, based on spectrum broadening and main frequency , the calculation formula of the frequency domain residual is defined as: (9) in, is the spatial expansion parameter, is the spectrum measurement error, is the frequency value of the kth discrete frequency point. is the predicted spectrum amplitude of the kth frequency point, is the spectrum amplitude of the signal actually received by the underwater beacon at the kth frequency point.

[0045] The time domain matching items are: Based on signal duration and envelope standard deviation , constrain the sound source expansion scale to be: (10) in, and For the allowable error.

[0046] In the energy matching term, based on the integral value of the acoustic energy density per unit time Define the energy decay residual:

[0047] (11) in, is the predicted energy intensity of the sound source at the fault point propagating to beacon i, is the measured energy intensity transmitted from the fault point sound source to beacon i.

[0048] (12) in, is the total energy of the sound source at the fault point, is the projection of the sound source spatial distribution function in the direction of beacon i, is the water sound absorption coefficient.

[0049] The objective function of the final three-dimensional inversion positioning model is: + (13) in, 、 and is the weight coefficient.

[0050] After iteratively optimizing the above objective function, the final positioning result and confidence score are obtained.

[0051] In this embodiment, the data communication alarm management unit 4 is used to receive the spatial location information of the submarine cable fault point, and send the spatial location information to the shore-based operation and maintenance system through a relay communication device deployed on the sea surface, and at the same time generate an alarm event record containing the fault location, positioning time, and acoustic fault extension characteristics.

[0052] Among them, the sea surface relay communication device refers to the communication equipment deployed on the sea surface to realize data forwarding between underwater equipment and shore-based systems. Specifically, it can be implemented using a buoy-type wireless communication module or a satellite communication terminal to solve the problem of limited underwater signal transmission distance and ensure that fault information is uploaded in a timely manner.

[0053] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0054] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0055] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A submarine cable fault location system based on underwater beacons, characterized in that: include: An underwater acoustic beacon array unit is used to monitor and collect acoustic wave signals of submarine cable faults in real time through underwater acoustic beacons; a fault signal processing and analysis unit, configured to extract submarine cable fault sound wave signal parameters from the submarine cable fault sound wave signal through a non-point source spatial sound source waveform analysis model, and then generate a multi-parameter fault sound source feature vector; The sound source localization analysis algorithm unit is used to calculate the time difference between the acoustic wave signal of the submarine cable fault and the underwater acoustic beacon, and calculate the spatial location information of the submarine cable fault point based on the multi-parameter fault sound source feature vector as a constraint; The data communication alarm management unit is used to transmit the spatial location information of the submarine cable fault point to the shore-based operation and maintenance system.

2. The submarine cable fault location system based on underwater beacons according to claim 1, characterized in that: The underwater acoustic beacon comprises a plurality of underwater acoustic beacon devices arranged at equal intervals along the cable, and each underwater acoustic beacon device is equipped with a broadband hydrophone.

3. The submarine cable fault location system based on underwater beacons according to claim 2, characterized in that: The underwater acoustic beacon device is provided with a high-precision clock module, and the broadband hydrophone is provided with a local data cache module and a high-precision clock module; all the underwater acoustic beacon devices and broadband hydrophones perform acoustic intercommunication through a time synchronization protocol.

4. The submarine cable fault location system based on underwater beacons according to claim 1, characterized in that: The fault signal processing and analysis unit includes a signal preprocessing module, a feature extraction module and a feature vector generation module; The signal preprocessing module is used to preprocess the fault sound wave signal to filter out noise; The feature extraction module is used to extract acoustic wave signal parameters from the preprocessed fault acoustic wave signal; The feature vector generating module is used to generate a multi-parameter fault sound source feature vector according to the fault sound wave signal parameters.

5. The submarine cable fault location system based on underwater beacons according to claim 4, characterized in that: The feature extraction module extracts the submarine cable fault acoustic wave signal parameters based on the submarine cable fault acoustic wave signal through a non-point source spatial sound source waveform analysis model; the non-point source spatial sound source waveform analysis model is: （1） in, is the space coordinate vector; The starting time of the sound; is the time envelope function; is a unit step function; is the spatial distribution function.

6. The submarine cable fault location system based on underwater beacons according to claim 5, characterized in that: The submarine cable fault acoustic wave signal parameters include spectrum broadening, signal duration, and signal main frequency displacement.

7. The submarine cable fault location system based on underwater beacons according to claim 1, characterized in that: The multi-parameter fault sound source feature vector is: （5） in, is the multi-parameter fault sound source feature vector; To broaden the spectrum; is the duration of the signal; is the signal main frequency displacement; is the integral value of sound energy density per unit time; is the standard deviation of the time distribution of the acoustic signal envelope.

8. The submarine cable fault location system based on underwater beacons according to claim 1, characterized in that: The specific process of the sound source localization analysis algorithm unit calculating the spatial position of the submarine cable fault point is as follows: based on the reception time and energy distribution of the submarine cable fault sound wave signal at each underwater acoustic beacon, the spatial position information and sound expansion scale of the fault sound wave signal are calculated, and the spatial position information and sound source spatial ductility parameters are output.

9. The submarine cable fault location system based on underwater beacons according to claim 8, characterized in that: The sound source spatial extensibility parameters include the spatial sound radius, main expansion direction vector and sound duration range of the fault sound wave signal; The spatial location information includes the three-dimensional coordinate position of the submarine cable fault point, the corresponding water depth value and the location reliability score.

10. The submarine cable fault location system based on underwater beacons according to claim 1, characterized in that: The data communication alarm management unit is further used to generate an alarm event record, and the alarm event record is used to record the spatial center position information of the fault sound wave signal and the sound source spatial ductility parameter.

Images