Underwater target detection method, device and equipment based on distributed array and medium

Abstract

The invention is suitable for the technical field of geophysical exploration, and provides an underwater target detection method based on a distributed array, and the method comprises the steps: collecting horizontal four-component electromagnetic data of a target sea area through distributed array detection nodes disposed at the seabed of the target sea area, performing signal enhancement on each piece of collected horizontal four-component electromagnetic data by adopting a preset signal enhancement strategy, performing time-frequency analysis on the enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum, and determining whether an underwater target appears or disappears in the target sea area according to the time-frequency analysis spectrum. Therefore, enhancement of target signals in an ocean noise environment is realized, the detection range of a current seabed distributed array detection system is enlarged, and the capability of detecting underwater targets is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of geophysical exploration, and in particular relates to an underwater target detection method, device, equipment and medium based on a distributed array. Background Art

[0002] In recent years, with the in-depth exploration and development of marine resources (such as seabed mineral resources and marine biological resources) by countries around the world, as well as the rapid development of marine economy (such as marine energy, marine transportation, and marine science and technology industries) in various countries, the ocean has become an important field of international competition. As a major maritime country, my country faces huge challenges in the security of coastal infrastructure such as ports and territorial waters. Therefore, it is extremely important to propose an effective underwater target detection method to identify underwater unidentified targets at a longer distance and achieve real-time early warning for the security and protection of my country's territorial waters.

[0003] For many years, acoustic detection has been the most mature underwater target detection technology. However, with the continuous development of underwater target acoustic noise reduction and acoustic stealth technology, and the increasing level of ocean noise, the self-noise of more advanced underwater targets is already lower than the background noise of the ocean. Therefore, it will be difficult to discover, identify and track underwater targets in the future using only acoustic detection technology, and the detection distance will be greatly limited. Therefore, if you want to gain an advantage in the increasingly complex and fierce competition for marine resources, you need to use other detection methods to effectively compensate for the defects of acoustic detection technology.

[0004] The shaft frequency electromagnetic field is a signal source with obvious harmonic characteristics that is self-generated by underwater moving targets due to corrosion and anti-corrosion effects. Over the past two decades, my country has made great progress in the generation mechanism, numerical simulation calculation and detection methods of shaft frequency electromagnetic fields. In terms of simulation research, the recognition of time-harmonic horizontal electric dipole as the equivalent shaft frequency electromagnetic field source has been initially formed. However, there is still a lack of research on underwater target recognition schemes based on shaft frequency electromagnetic field characteristics, and there is a lack of recognition schemes based on the deployment of distributed detection devices. The detection range and target recognition capabilities are limited, and target information cannot be fully obtained. Summary of the invention

[0005] The purpose of the present invention is to provide an underwater target detection method, device, equipment and storage medium based on a distributed array, aiming to solve the problem of limited underwater detection range and underwater target identification capability caused by the prior art.

[0006] In one aspect, the present invention provides a method for underwater target detection based on a distributed array, the method comprising the following steps:

[0007] Collecting horizontal four-component electromagnetic data of the target sea area through detection nodes on a seabed distributed detection array, wherein the seabed distributed detection array is arranged on the seabed of the target sea area;

[0008] Using a preset signal enhancement strategy to enhance the signal of each of the collected horizontal four-component electromagnetic data;

[0009] Performing time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum;

[0010] Determine whether an underwater target appears in the target sea area according to the time-frequency analysis spectrum.

[0011] Preferably, the step of performing signal enhancement on each of the collected horizontal four-component electromagnetic data using a preset signal enhancement strategy comprises:

[0012] The horizontal four-component electromagnetic data collected by all detection nodes in a rectangular area of ​​a preset area around each detection node on the seabed distributed detection array are superimposed, and the superimposed horizontal four-component electromagnetic data are used as the horizontal four-component electromagnetic data after the signal of each detection node is enhanced.

[0013] Preferably, the step of performing time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data comprises:

[0014] Short-time Fourier transform is used to perform time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data.

[0015] Preferably, each detection node of the seabed distributed detection array is equipped with a seabed electric field sensor and a seabed magnetic field sensor, wherein each of the seabed electric field sensors includes a pair of measuring electrodes arranged perpendicular to each other, and each of the seabed magnetic field sensors includes a pair of magnetic bars arranged perpendicular to each other.

[0016] Preferably, the step of collecting horizontal four-component electromagnetic data of the target sea area through the detection nodes on the seabed distributed detection array includes:

[0017] Two horizontal electric field component data are collected by the seabed electric field sensor of each detection node, and two horizontal magnetic field component data are collected by the seabed magnetic field sensor of each detection node.

[0018] On the other hand, the present invention provides an underwater target detection device based on a distributed array, the device comprising:

[0019] An electromagnetic data acquisition unit, used to collect horizontal four-component electromagnetic data of a target sea area through detection nodes on a seabed distributed detection array, wherein the seabed distributed detection array is arranged on the seabed of the target sea area;

[0020] An electromagnetic data enhancement unit, configured to perform signal enhancement on each of the collected horizontal four-component electromagnetic data using a preset signal enhancement strategy;

[0021] A data time-frequency analysis unit, used for performing time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum;

[0022] The target detection and determination unit is used to determine whether there is an underwater target in the target sea area according to the time-frequency analysis spectrum.

[0023] Preferably, the electromagnetic data enhancement unit comprises:

[0024] The electromagnetic data superposition unit is used to superimpose the horizontal four-component electromagnetic data collected by all detection nodes in a rectangular area of ​​a preset area around each detection node on the seabed distributed detection array, and use the superimposed horizontal four-component electromagnetic data as the horizontal four-component electromagnetic data after the signal of each detection node is enhanced.

[0025] Preferably, the data time-frequency analysis unit includes:

[0026] The time-frequency analysis subunit is used to perform time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data by using short-time Fourier transform.

[0027] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the underwater target detection method based on a distributed array are implemented.

[0028] On the other hand, the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps described in the above-mentioned underwater target detection method based on a distributed array.

[0029] The present invention collects horizontal four-component electromagnetic data of the target sea area by deploying detection nodes of a submarine distributed detection array on the seabed of the target sea area, adopts a preset signal enhancement strategy to perform signal enhancement on each collected horizontal four-component electromagnetic data, performs time-frequency analysis on each enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum, and determines whether there are underwater targets in the target sea area according to the time-frequency analysis spectrum, thereby achieving enhancement of target signals in an ocean noise environment, increasing the detection range of the current submarine distributed array detection system, and improving the ability to detect underwater targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1is a flow chart of an implementation of an underwater target detection method based on a distributed array provided in Embodiment 1 of the present invention;

[0031] Figure 2 It is a schematic diagram of a seabed distributed detection array and an underwater target scene in the underwater target detection method based on a distributed array provided in the first embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of a multi-detection node data superposition method in an underwater target detection method based on a distributed array provided in Embodiment 1 of the present invention;

[0033] Figure 4 It is the time-frequency analysis spectrum of the axial frequency magnetic field of the detection node of the survey line 13 km away from the source route in the underwater target detection method based on the distributed array provided in the first embodiment of the present invention (without data superposition processing);

[0034] Figure 5 It is the time-frequency analysis spectrum of the axial frequency magnetic field of the detection node of the survey line 13 km away from the source travel route in the underwater target detection method based on the distributed array provided in the first embodiment of the present invention (after data superposition processing);

[0035] Figure 6 is a schematic diagram of the structure of an underwater target detection device based on a distributed array provided in Embodiment 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of a preferred structure of an underwater target detection device based on a distributed array provided in Embodiment 2 of the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments:

[0040] Embodiment 1:

[0041] Figure 1 The implementation process of the underwater target detection method based on a distributed array provided in the first embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0042] In step S101, horizontal four-component electromagnetic data of the target sea area are collected by detection nodes on a seabed distributed detection array, where the seabed distributed detection array is arranged on the seabed of the target sea area.

[0043] The embodiment of the present invention is applicable to electronic equipment, systems or platforms for detecting underwater targets. In the embodiment of the present invention, first, according to the observation area and / or coordinates of the target sea area, a distributed array is used to construct a seabed distributed detection array, the seabed distributed detection array is composed of a plurality of evenly distributed detection nodes, each detection node realizes signal collection in its own area, and the constructed seabed distributed detection array is arranged on the seabed of the target sea area, and then, the horizontal four-component electromagnetic data of the target sea area is collected through each detection node on the seabed distributed detection array, wherein the horizontal four-component electromagnetic data refers to the two component data of the electric field signal in the horizontal direction collected simultaneously during the electromagnetic detection process (expressed as (E x ,E y )) and the two component data of the magnetic field signal in the horizontal direction (expressed as (B x ,B y )), in addition, the electric field signals collected by each detection node are superimposed electric field signals including the target shaft frequency electric field information and the ocean background electric field information, and the magnetic field signals are superimposed magnetic field signals including the target shaft frequency magnetic field information and the ocean background magnetic field information. The target shaft frequency electric field / magnetic field information is the electric field / magnetic field signal with obvious shaft frequency characteristics generated by the underwater target during its navigation in the sea water. The ocean background electric field / magnetic field information is the background electric field / magnetic field information distributed in the ocean environment, such as electric field / magnetic field fluctuations caused by natural factors such as ocean flow, salinity changes, tidal effects, and geomagnetic field changes. The collected electric field and magnetic field data are transmitted to the ground data processing center in real time via submarine cables or wireless transmission equipment.

[0044] In a feasible embodiment, according to the observation area and / or coordinates of the target sea area and the preset node interval, a distributed array is used to construct a seabed distributed detection array, and the constructed seabed distributed detection array is deployed on the seabed of the target sea area. Figure 2 As shown, for the target sea area with an area of ​​20km*20km, the node interval is set to 1km. According to the node interval, a seabed distributed detection array is constructed in a distributed array manner, and the constructed seabed distributed detection array is deployed on the seabed of the target sea area at a depth of 200m from the sea level.

[0045] In another feasible embodiment, each detection node of the seabed distributed detection array is equipped with a set of seabed electric field sensors and a set of seabed magnetic field sensors, wherein each seabed electric field sensor includes a pair of measuring electrodes arranged vertically to measure the horizontal electric field component data Ex 、E y Each seabed magnetic field sensor contains a pair of magnetic bars arranged perpendicular to each other to collect horizontal magnetic field component data B x , B y To collect.

[0046] In another feasible embodiment, when collecting horizontal four-component electromagnetic data of the target sea area through the detection nodes on the seabed distributed detection array, two horizontal electric field component data are collected through the seabed electric field sensor of each detection node, and two horizontal magnetic field component data are collected through the seabed magnetic field sensor of each detection node, thereby improving the real-time performance of signal acquisition.

[0047] In the embodiment of the present invention, when an electric field exists, a potential difference is generated between the two measuring electrodes in the seabed electric field sensor. The seabed electric field sensor obtains two component data of the electric field signal in the horizontal direction by measuring the potential difference, namely, E x 、E y For ease of description, according to the array structure of the seabed distributed detection array, the horizontal electric field component data collected by each detection node is expressed as E x (i,j),E y (i,j),E x (i, j) is the electric field component data collected by the jth detection node on the i-th measurement line in the array along the X-axis direction, E y (i, j) is the electric field component data collected by the jth detection node on the i-th measurement line in the array along the Y-axis direction. As an example, Figure 2 As shown in the figure, along the X-axis direction, the electric field component data collected by the first detection node from west to east on the measurement line numbered 1 (i.e. line1) is expressed as E x (1,1), the electric field component data collected by the first detection node from west to east on the line numbered 2 (i.e. line2) is expressed as E x (2,1), and so on; at the same time, the magnetic bar in the seabed magnetic field sensor can sense the surrounding magnetic field. When the magnetic field exists, the seabed magnetic field sensor obtains two component data of the magnetic field signal in the horizontal direction, namely B x , B y For the convenience of description, according to the array structure of the seabed distributed detection array, the horizontal magnetic field component data collected by each detection node is expressed as B x (i,j),B y (i,j), B x (i, j) is the magnetic field component data collected by the jth detection node on the i-th measurement line in the array along the X-axis direction, B y(i, j) is the magnetic field component data collected by the jth detection node on the i-th measurement line in the array along the Y-axis direction. As an example, Figure 2 As shown in the figure, along the X-axis direction, the magnetic field component data collected by the first detection node on line1 from west to east is represented by B x (1,1), the magnetic field component data collected by the first detection node from west to east on line2 is represented by B x (2,1), and so on.

[0048] In step S102, a preset signal enhancement strategy is used to enhance the signal of each collected horizontal four-component electromagnetic data.

[0049] In an embodiment of the present invention, under the condition that the underwater target is far away from the seabed distributed detection array and the target shaft-frequency electromagnetic field frequency information cannot be identified, a preset signal enhancement strategy is used to perform signal enhancement on the horizontal four-component electromagnetic data collected by each detection node, so as to enhance the shaft-frequency electromagnetic field frequency information of the long-distance underwater target in the time domain signal with a low signal-to-noise ratio, thereby achieving the purpose of increasing the detection distance.

[0050] In a feasible embodiment, when a preset signal enhancement strategy is used to enhance the signal of each collected horizontal four-component electromagnetic data, the horizontal four-component electromagnetic data collected by all detection nodes in a rectangular area of ​​a preset area around each detection node on the seabed distributed detection array are superimposed, and the superimposed horizontal four-component electromagnetic data are used as the horizontal four-component electromagnetic data after the signal of each detection node is enhanced.

[0051] In an embodiment of the present invention, for each detection node in the seabed distributed detection array, horizontal four-component electromagnetic data collected by other detection nodes in a rectangular area of ​​a given area around each detection node are obtained, and the horizontal four-component electromagnetic data collected by all other detection nodes are linearly superimposed with the four-component electromagnetic data collected by the detection node itself, and the superimposed four-component electromagnetic data is used as the four-component electromagnetic data after the detection node signal is enhanced, thereby achieving suppression interference and enhancing the target frequency information response.

[0052] In a feasible embodiment, the area region is set based on the node spacing of the seabed distributed detection array. The size of the area region can be set to 2 node spacings * 2 node spacings, or the size of the area region can be set to 3 node spacings * 3 node spacings. Here, the size of the area region can be modified according to the actual detection effect to improve the detection accuracy and the ability to detect underwater targets.

[0053] As an example, the enhanced magnetic field component data B yFor example, for the convenience of description, the node number is used to describe B y (i,j), such as Figure 3 As shown in the figure, the node number of the detection node corresponding to the first node position on Line 14 of the array is 274, so B y (14,1) can be expressed as If the given area is 2 node spacings * 2 node spacings, i.e. 2km * 2km, for the detection node numbered 274, the other detection nodes in the rectangular area of ​​2km * 2km around it include the detection nodes numbered 295, 296, 297, 275, 276, 253, 254, and 255. Then the magnetic field component data collected by the detection nodes numbered 295, 296, 297, 275, 276, 253, 254, and 255 are obtained. Then and Perform linear superposition, that is This is the magnetic field component data of the detection node numbered 274 after the magnetic field signal is enhanced in the Y-axis direction. Similarly, the magnetic field B of other detection nodes on Line 14 are processed in turn. y Component signal, that is, for the detection node with node number 275, there is For the detection node with node number 276, For the detection node with node number 277, The magnetic field B after the signals of all detection nodes on Line 14 are enhanced is obtained in turn. y Component data Similarly, the four-component electromagnetic data after the signals of all detection nodes in the seabed distributed detection array are enhanced can be obtained, which can be expressed as

[0054] In another feasible embodiment, when using a preset signal enhancement strategy to enhance the signal of each horizontal four-component electromagnetic data collected, first use short-time Fourier transform to perform time-frequency analysis on the horizontal four-component electromagnetic data collected by each detection node to obtain the time-frequency analysis spectrum corresponding to each detection node, and determine whether abnormal shaft-frequency electromagnetic field frequency components are identified from these time-frequency analysis spectra. If so, it is determined that there are underwater targets in the target sea area. Otherwise, use a preset signal enhancement strategy to enhance the signal of each horizontal four-component electromagnetic data collected, wherein the abnormal shaft-frequency electromagnetic field frequency components are shaft-frequency electromagnetic field information generated by unknown underwater non-cooperative targets or known underwater targets.

[0055] In step S103, time-frequency analysis is performed on each of the enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum.

[0056] In the embodiment of the present invention, for each detection node in the seabed distributed detection array, the enhanced Perform time-frequency analysis respectively to obtain the time-frequency analysis spectra corresponding to the electromagnetic field component data, which are expressed as

[0057] In a feasible embodiment, a short-time Fourier transform (STFT) is used to perform time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data. Specifically, a Hanning window with 64 sampling points is selected, and the calculation formula is used. The time-frequency analysis spectrum corresponding to the horizontal electric field component data and the time-frequency analysis spectrum corresponding to the horizontal magnetic field component data of each detection node in a specific time period are obtained respectively, so as to suppress interference and enhance the axis frequency electromagnetic field frequency information of the long-distance underwater target in the time domain signal with low signal-to-noise ratio, so as to achieve the purpose of increasing the detection distance. Among them, x(t) is the electromagnetic field signal collected by an input detection node within time t, ω(t-τ) is the window function, which is used to divide the signal into shorter time periods, τ is the center position of the window (or called time index), which indicates the position of the current window on the time axis, and e -j2πft is the kernel function of the Fourier transform, j is the imaginary unit, and X(τ,f) is the short-time Fourier transform result at τ and frequency f, that is, the corresponding time-frequency analysis spectrum.

[0058] In step S104, it is determined whether there are underwater targets in the target sea area according to the time-frequency analysis spectrum.

[0059] In the embodiment of the present invention, each time-frequency analysis spectrum corresponding to each detection node An analysis is performed, and when an abnormal shaft-frequency electromagnetic field frequency component is identified in the time-frequency analysis spectrum, it is determined that an underwater target is detected in the target sea area, otherwise, it is determined that no underwater target is detected in the target sea area.

[0060] In order to verify the underwater target detection effect of the present application, a seabed distributed detection array is used to detect underwater targets and an air-seawater-seabed geoelectric model is constructed to simulate marine application scenarios. Under the receiving conditions of the seabed distributed detection array, the shaft-frequency electric field and magnetic field signals of underwater targets moving in a certain direction are simulated. The ocean background electromagnetic field noise of a certain intensity and satisfying Gaussian distribution is linearly superimposed on the simulated shaft-frequency electromagnetic field signal of a certain time length, thereby simulating the shaft-frequency electromagnetic field signal received under the actual measurement conditions of the seabed; specifically, Figure 2As shown in the figure, the diving depth of the underwater target is set to 50m, the propeller rotation frequency is 60r / min (that is, the shaft frequency electromagnetic field source frequency is 1Hz), the equivalent electric dipole moment of the shaft frequency electromagnetic field source is 50Am, the air-seawater-seabed geoelectric model is set (the underwater target moves in the seawater layer), the seawater layer resistivity is 0.33Ωm, the seabed layer resistivity is 3Ωm, the seawater depth is 200m, and the target moves along the seawater layer. Figure 2 As shown, the target moves 3 km in the east direction directly above Line 1, with a constant speed of 5 m / s. The shaft-frequency electric and magnetic field signals with a duration of 600 s received by each seabed detection node are simulated. The sampling frequency of this verification experiment example is 4 Hz. At the same time, in order to simulate the background electromagnetic field of the ocean, noise with a Gaussian distribution and a mean square error of 1 nV / m is added to the simulated shaft-frequency electric field signal of each seabed detection node. Noise with a Gaussian distribution and a mean square error of 1 nT is added to the simulated shaft-frequency magnetic field signal of each seabed detection node as the simulated electromagnetic signal for subsequent method verification. Afterwards, each detection node is respectively The noisy shaft-frequency electromagnetic field signal is short-time Fourier transformed to obtain a time-frequency analysis spectrum, and the target shaft-frequency electromagnetic field frequency component is identified from the time-frequency analysis spectrum (the frequency component is 1Hz in this verification experiment example) to determine whether there is a target object. When the target shaft-frequency electromagnetic field frequency component is not identified, the small facet superposition method is used to linearly superimpose the data of multiple detection nodes in a given area around each detection node, and a superposition signal is obtained on each detection node. Finally, the superposition signal on each detection node is short-time Fourier transformed to obtain a new time-frequency analysis spectrum, and then the target shaft-frequency electromagnetic field frequency component is extracted from the new time-frequency analysis spectrum. Figure 4 , Figure 5 They are the time-frequency analysis spectra of the magnetic field signals of the detection nodes of Line 14 from west to east with an interval of 1 km before and after data stacking. Figure 5 It can be seen that the target axial frequency electromagnetic field frequency component (1Hz) after data superposition processing can be identified from the time-frequency analysis spectrum, which verifies that the present application can realize underwater target detection at a farther distance, enhance the response of the target signal in the ocean noise environment, and improve the ability to detect underwater targets.

[0061] In an embodiment of the present invention, detection nodes of a submarine distributed detection array are deployed on the seabed of a target sea area to collect horizontal four-component electromagnetic data of the target sea area, a preset signal enhancement strategy is used to perform signal enhancement on each collected horizontal four-component electromagnetic data, time-frequency analysis is performed on each enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum, and whether there are underwater targets in the target sea area is determined based on the time-frequency analysis spectrum, thereby achieving enhancement of target signals in an ocean noise environment, increasing the detection range of the current submarine distributed array detection system, and improving the ability to detect underwater targets.

[0062] Embodiment 2:

[0063] Figure 6 The structure of the underwater target detection device based on the distributed array provided in the second embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, including:

[0064] The electromagnetic data acquisition unit 61 is used to collect horizontal four-component electromagnetic data of the target sea area through detection nodes on a seabed distributed detection array, wherein the seabed distributed detection array is arranged on the seabed of the target sea area;

[0065] The electromagnetic data enhancement unit 62 is used to enhance the signal of each horizontal four-component electromagnetic data collected by using a preset signal enhancement strategy;

[0066] The data time-frequency analysis unit 63 is used to perform time-frequency analysis on each horizontal four-component electromagnetic data after enhancement to obtain a time-frequency analysis spectrum;

[0067] The target detection and determination unit 64 is used to determine whether there is an underwater target in the target sea area according to the time-frequency analysis spectrum.

[0068] Preferably, if Figure 7 As shown, the electromagnetic data enhancement unit 62 includes:

[0069] The electromagnetic data superposition unit 621 is used to superimpose the horizontal four-component electromagnetic data collected by all detection nodes in a rectangular area of ​​a preset area around each detection node on the seabed distributed detection array, and use the superimposed horizontal four-component electromagnetic data as the horizontal four-component electromagnetic data after the signal of each detection node is enhanced.

[0070] The data time-frequency analysis unit 63 includes:

[0071] The time-frequency analysis subunit 631 is used to perform time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data by using short-time Fourier transform.

[0072] In the embodiment of the present invention, each unit of the underwater target detection device based on the distributed array can be implemented by a corresponding hardware or software unit, and each unit can be an independent software or hardware unit, or can be integrated into a software or hardware unit, which is not intended to limit the present invention. Specifically, the implementation of each unit can refer to the description of the aforementioned embodiment 1, which will not be repeated here.

[0073] Embodiment three:

[0074] Figure 8 The structure of an electronic device provided by the third embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown.

[0075] The electronic device 8 of the embodiment of the present invention includes a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80. When the processor 80 executes the computer program 82, the steps in the above-mentioned embodiment of the underwater target detection method based on the distributed array are implemented, such as Figure 1 Alternatively, when the processor 80 executes the computer program 82, the functions of each unit in the above-mentioned device embodiments are realized, for example Figure 6 The functions of the units 61 to 64 are shown.

[0076] In an embodiment of the present invention, detection nodes of a submarine distributed detection array are deployed on the seabed of a target sea area to collect horizontal four-component electromagnetic data of the target sea area, a preset signal enhancement strategy is used to perform signal enhancement on each collected horizontal four-component electromagnetic data, time-frequency analysis is performed on each enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum, and whether there are underwater targets in the target sea area is determined based on the time-frequency analysis spectrum, thereby achieving enhancement of target signals in an ocean noise environment, increasing the detection range of the current submarine distributed array detection system, and improving the ability to detect underwater targets.

[0077] The steps implemented when the processor 80 in the electronic device 8 of the embodiment of the present invention executes the computer program 82 to implement the underwater target detection method based on a distributed array can be referred to the description of the aforementioned method embodiment, which will not be repeated here.

[0078] Embodiment 4:

[0079] In an embodiment of the present invention, a computer-readable storage medium is provided, which stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned distributed array-based underwater target detection method embodiment are implemented, for example, Figure 1 Alternatively, when the computer program is executed by a processor, the functions of each unit in the above-mentioned device embodiments are realized, for example Figure 6 The functions of the units 61 to 64 are shown.

[0080] In an embodiment of the present invention, detection nodes of a submarine distributed detection array are deployed on the seabed of a target sea area to collect horizontal four-component electromagnetic data of the target sea area, a preset signal enhancement strategy is used to perform signal enhancement on each collected horizontal four-component electromagnetic data, time-frequency analysis is performed on each enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum, and whether there are underwater targets in the target sea area is determined based on the time-frequency analysis spectrum, thereby achieving enhancement of target signals in an ocean noise environment, increasing the detection range of the current submarine distributed array detection system, and improving the ability to detect underwater targets.

[0081] The computer-readable storage medium of the embodiment of the present invention may include any entity or device or recording medium capable of carrying computer program code, for example, ROM / RAM, magnetic disk, optical disk, flash memory and other memories.

[0082] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for underwater target detection based on a distributed array, characterized in that: The method comprises the following steps: Collecting horizontal four-component electromagnetic data of the target sea area through detection nodes on a seabed distributed detection array, wherein the seabed distributed detection array is arranged on the seabed of the target sea area; Using a preset signal enhancement strategy to enhance the signal of each of the collected horizontal four-component electromagnetic data; Performing time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum; Determine whether an underwater target appears in the target sea area according to the time-frequency analysis spectrum.

2. The method according to claim 1, characterized in that The step of performing signal enhancement on each of the collected horizontal four-component electromagnetic data using a preset signal enhancement strategy comprises: The horizontal four-component electromagnetic data collected by all detection nodes in a rectangular area of ​​a preset area around each detection node on the seabed distributed detection array are superimposed, and the superimposed horizontal four-component electromagnetic data are used as the horizontal four-component electromagnetic data after the signal of each detection node is enhanced.

3. The method according to claim 1, characterized in that The step of performing time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data comprises: Short-time Fourier transform is used to perform time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data.

4. The method according to claim 1, characterized in that Each detection node of the seabed distributed detection array is equipped with a seabed electric field sensor and a seabed magnetic field sensor, wherein each of the seabed electric field sensors includes a pair of measuring electrodes arranged perpendicularly to each other, and each of the seabed magnetic field sensors includes a pair of magnetic bars arranged perpendicularly to each other.

5. The method according to claim 4, characterized in that: The steps of collecting horizontal four-component electromagnetic data of the target sea area through the detection nodes on the seabed distributed detection array include: Two horizontal electric field component data are collected through the seabed electric field sensor of each detection node, and two horizontal magnetic field component data are collected through the seabed magnetic field sensor of each detection node.

6. An underwater target detection device based on a distributed array, characterized in that: The device comprises: An electromagnetic data acquisition unit, used to collect horizontal four-component electromagnetic data of a target sea area through detection nodes on a seabed distributed detection array, wherein the seabed distributed detection array is arranged on the seabed of the target sea area; An electromagnetic data enhancement unit, configured to perform signal enhancement on each of the collected horizontal four-component electromagnetic data using a preset signal enhancement strategy; A data time-frequency analysis unit, used for performing time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data to obtain a time-frequency analysis spectrum; The target detection and determination unit is used to determine whether there is an underwater target in the target sea area according to the time-frequency analysis spectrum.

7. The device according to claim 6, characterized in that The electromagnetic data enhancement unit comprises: The electromagnetic data superposition unit is used to superimpose the horizontal four-component electromagnetic data collected by all detection nodes in a rectangular area of ​​a preset area around each detection node on the seabed distributed detection array, and use the superimposed horizontal four-component electromagnetic data as the horizontal four-component electromagnetic data after the signal of each detection node is enhanced.

8. The device according to claim 6, characterized in that The data time-frequency analysis unit comprises: The time-frequency analysis subunit is used to perform time-frequency analysis on each of the enhanced horizontal four-component electromagnetic data by using short-time Fourier transform.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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