A type of all-fiber acoustic and attitude integrated dragged linear array

Abstract

This application relates to the field of fiber optic towed sonar arrays, specifically disclosing a fiber optic towed linear array, comprising: a watertight optical cable, a transmission optical fiber, a multi-core optical fiber, multiple hydrophone probes, a sleeve, and a first watertight connector. The first watertight connector is installed in conjunction with the sleeve, and a watertight optical cable is disposed within the first watertight connector. The watertight optical cable branches into a transmission optical fiber and a multi-core optical fiber on the side near the sleeve. The transmission optical fiber is connected to the hydrophone probe, and the multi-core optical fiber is spirally wound around the outer periphery of the hydrophone probe and housed within the sleeve. The solution provided in this application overcomes the shortcomings of existing all-fiber towed linear arrays, which have many optical devices and can only measure attitude information at points, realizing distributed measurement of the towed array attitude and improving reliability.

Description

Technical Field

[0001] This application relates to the field of fiber optic towed sonar arrays, and more particularly to an all-fiber integrated acoustic and attitude towed linear array. Background Technology

[0002] Fiber optic towed array sonar, based on fiber optic hydrophones, is an important anti-submarine warfare (ASW) weapon. Unlike traditional piezoelectric towed sonar, it boasts advantages such as high sensitivity, small size, passive wet end, and relatively unrestricted aperture. It can be used not only on large surface and underwater vessels but also for detecting small surface and underwater robots and other underwater targets. The modulation and demodulation units and other electronic components of the fiber optic towed array are located inside the vessel. The wet end containing the hydrophone is towed behind the vessel to sense acoustic signals. Simultaneously, depth and heading sensors acquire the depth and array attitude of the towed array. Combined with the acoustic signals, this allows for target localization and tracking. However, due to the influence of underwater currents and the vessel's trajectory, the dynamically flexible towed array struggles to accurately retrieve its own attitude information. Therefore, the accuracy of the towed array's attitude and position information is a crucial factor determining the accuracy of target detection.

[0003] Existing all-fiber towed arrays typically use several fiber depth gauges and fiber optic gyroscopes to invert their own attitude information. However, the large number of devices in existing all-fiber towed arrays results in a large size, limiting the diameter of the towed array. At the same time, the installation and cascading of several optical devices also reduces the reliability of the towed array. Summary of the Invention

[0004] This application provides a fiber optic towed linear array that uses a single spirally mounted multi-core fiber to invert the three-dimensional shape, replacing several optical devices such as fiber optic depth sensors and fiber optic gyroscopes. The aim is to overcome the shortcomings of existing all-fiber towed linear arrays, which have many optical devices and can only measure attitude information at points, and to achieve distributed measurement of the towed array's attitude and improve reliability.

[0005] In one aspect, an optical fiber towed array is provided, comprising: a watertight optical cable, a transmission optical fiber, a multi-core optical fiber, multiple hydrophone probes, a sleeve, and a first watertight connector.

[0006] The first watertight connector is installed in conjunction with the sleeve. The watertight optical cable is provided inside the first watertight connector. The watertight optical cable branches into the transmission optical fiber and the multi-core optical fiber on the side near the sleeve. The transmission optical fiber is connected to the hydrophone probe. The multi-core optical fiber is spirally wound around the outer periphery of the hydrophone probe and housed inside the sleeve.

[0007] Compared with the prior art, the solution provided in this application has at least the following beneficial technical effects:

[0008] This invention addresses the characteristic of towed linear arrays requiring simultaneous acquisition of acoustic and array attitude signals. By using a single spirally mounted multi-core optical fiber to invert the three-dimensional shape and determine the real-time position of the hydrophone and the attitude of the towed array, it overcomes the shortcomings of existing all-fiber towed arrays, such as unreliable multi-connection systems for point-mounted fiber depth gauges, fiber optic gyroscopes, and other optical devices, and the inability to distribute array attitude correction. It features tensile strength, no electricity within the wet end of the array, fewer optical devices, smaller array cable diameter, and simple structure, enabling distributed attitude correction of the towed array and significantly improving the orientation accuracy and reliability of the towed linear array.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the multi-core optical fiber includes multiple spiral sections connected end to end and arranged at equal intervals, the multiple spiral sections include N spiral section groups, and the N spiral section groups correspond one-to-one with the N hydrophone probes.

[0010] The multi-core optical fiber can be wound in a regular spiral pattern, facilitating the deduction of the real-time spatial coordinates of the hydrophone probe based on the multi-core fiber. The spiral installation of the multi-core fiber ensures the axial flexibility of the towed array under tension, and makes it easier to derive the axial centerline equation and coordinates of the cylinder formed by the spiral curve, thus facilitating the determination of the hydrophone probe's position. This avoids the irregular curves derived from simply embedding a single multi-core fiber with some slack, significantly reducing the difficulty of deriving the hydrophone's position in a towed linear array, and overcoming the reduced system reliability caused by the axial expansion and contraction deformation during towing.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, each of the spiral part groups includes 1 to 5 spiral parts.

[0012] The number of helical parts included in the helical assembly is relatively appropriate, which is beneficial for making the real-time spatial position coordinates of the hydrophone probe relatively accurate, and also for making the calculation process of the real-time spatial position relatively simple.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, a support float is provided between two adjacent hydrophone probes, the support float being provided with a spiral multi-core fiber optic hole, the multi-core fiber optic hole being located at the edge of the support float, and the multi-core fiber optic helix passing through the multi-core fiber optic hole.

[0014] The support float is equipped with a spiral-shaped multi-core fiber optic hole, which allows the multi-core fiber optic cable to spirally pass through the multi-core fiber optic hole, thereby enabling the support float to support and fix the multi-core fiber optic cable inside the sleeve.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, a second watertight joint is provided on the side of the sleeve away from the first watertight joint;

[0016] The fiber optic towed array also includes a load-bearing rope, which is connected between the second watertight joint and the first watertight joint and is placed inside the sleeve.

[0017] The support float also includes a load-bearing rope hole, which is located at the edge of the support float, through which the load-bearing rope passes and is fixed to the load-bearing rope hole.

[0018] By fixing the load-bearing rope to the support float, the load-bearing rope can withstand the drag force of the fiber optic towed array and limit the position of the support float.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, the supporting float is further provided with a hydrophone probe hole, the hydrophone probe hole being arranged opposite to the axis of the fiber optic towed array, and the transmission fiber passing through the hydrophone probe hole.

[0020] The support float is equipped with a hydrophone probe hole to facilitate the proper placement of the transmission optical fiber within the sleeve.

[0021] In conjunction with the first aspect, in some implementations of the first aspect, the fiber optic towed array further includes a flexible sleeve, which is fixed to the hydrophone probe. The flexible sleeve also includes two symmetrically arranged flexible antennas, which are respectively fastened to two symmetrically arranged load-bearing ropes. The two flexible antennas are used to align the hydrophone probe with the axis of the fiber optic towed array.

[0022] Compared to relatively rigid connection methods, flexible connections using flexible antennas and sleeves can act as a buffer during towing, reducing acceleration noise from the hydrophone probe and increasing the installation space for multi-core optical fibers. Furthermore, the greater flexibility of the flexible antennas and sleeves results in a relatively smaller bending radius for the towed fiber array.

[0023] In conjunction with the first aspect, in some implementations of the first aspect, the fiber optic towed array further includes a helically wound spring seat, one end of which is connected to the hydrophone probe and the other end of which is connected to the load-bearing rope. The helical radius of the spring seat gradually increases in the direction from the hydrophone probe to the load-bearing rope. The spring seat is used to align the hydrophone probe with the axis of the fiber optic towed array.

[0024] The spring seat can act as a buffer, while also better fixing the position of the hydrophone probe on the center line. This is more conducive to matching the position of the multi-core optical fiber and helps to balance the acceleration noise of the hydrophone probe and the detection accuracy.

[0025] In conjunction with the first aspect, in some implementations of the first aspect, the radius difference between the hydrophone probe and the sleeve is less than or equal to a preset radius, a spiral groove is provided on the outer periphery of the hydrophone probe, and the multi-core optical fiber is correspondingly disposed in the spiral groove.

[0026] This allows for a relatively accurate determination of the relative positional relationship between the multi-core optical fiber and the hydrophone probe. The larger diameter hydrophone probe also acts as a support instead of a support float; the fiber optic towed array can eliminate some or all of the support floats, reducing the structural complexity of the fiber optic towed array.

[0027] In conjunction with the first aspect, in some implementations of the first aspect, the number of optical fibers in the multi-core optical fiber is greater than or equal to 3.

[0028] With a relatively large number of optical fibers, the orientation and shape can be inverted through the misalignment between multiple fibers, which helps to increase the amount of usable information in the inversion. Each core is distributed parallel to the axis of the multi-core fiber. Using the principle of distributed Rayleigh scattering in optical fibers, the curvature information and bending direction of each core in the multi-core fiber with distance can be obtained. Substituting the curvature information and bending direction into the three-dimensional shape reconstruction model, a three-dimensional helical shape is obtained.

[0029] Secondly, a method for determining the location of a sound source is provided, the method being applied to an optical fiber towed array as described in any of the implementations of the first aspect above, the method comprising:

[0030] Based on the signal fed back from the multi-core optical fiber, the real-time attitude curve f(x1,y1,z1,t) of the fiber-towed linear array is obtained.

[0031] Based on the positional relationship between the multiple hydrophone probes and the multi-core optical fiber and the real-time attitude curve f(x1,y1,z1,t), the real-time spatial coordinates x of the hydrophone probes are obtained. i ,y i ,z i , where i is the position number of different hydrophone probes;

[0032] Based on the real-time spatial coordinates x i ,y i ,z i The location of the sound source is determined by the signal fed back from the hydrophone probe.

[0033] The method provided in this application embodiment can use the signal feedback from a multi-core optical fiber to retrieve the real-time spatial coordinates of the hydrophone probe, thereby determining the location of the sound source.

[0034] In conjunction with the second aspect, in some implementations of the second aspect, the real-time spatial coordinates x of the hydrophone probe are obtained based on the positional relationship between the plurality of hydrophone probes and the multi-core optical fiber and the real-time attitude curve f(x1,y1,z1,t). i ,y i ,z i ,include:

[0035] Based on the real-time attitude curve f(x1,y1,z1,t), the real-time spatial curve f(x,y,z,t) of the fiber optic towed array is obtained.

[0036] Based on the positional relationship between the multiple hydrophone probes and the multi-core optical fiber and the real-time spatial curve f(x,y,z,t), the real-time spatial coordinate x is determined. i ,y i ,z i .

[0037] The real-time attitude curve of a multi-core optical fiber can reflect the real-time spatial curve of a fiber optic towed array, which in turn reflects the axial shape of the fiber optic towed array and thus the real-time spatial coordinates of the hydrophone probe.

[0038] In conjunction with the second aspect, in some implementations of the second aspect, the determination of the real-time spatial coordinate x is based on the positional relationship between the plurality of hydrophone probes and the multi-core optical fiber and the real-time spatial curve f(x,y,z,t). i ,y i ,z i ,include:

[0039] Based on one or more helical sections of the multi-core optical fiber corresponding to each hydrophone probe, the real-time spatial position coordinate x is selected on the real-time spatial curve f(x,y,z,t). i ,y i ,z i .

[0040] Dividing the real-time spatial curve into simple segments based on the number of hydrophone probes helps simplify the calculation of the output real-time spatial position coordinates.

[0041] Thirdly, an electronic device is provided for performing the method as described in any of the implementations of the second aspect above. Attached Figure Description

[0042] Figure 1 This is a schematic structural diagram of a fiber optic towed array provided in an embodiment of this application.

[0043] Figure 2This is a schematic structural diagram of a support float provided in an embodiment of this application.

[0044] Figure 3 This is a schematic structural diagram of a support float provided in an embodiment of this application.

[0045] Figure 4 A schematic structural diagram of the fixing structure of various hydrophone probes provided in the embodiments of this application.

[0046] Figure 5 This is a rendering of a fiber optic drag array provided in an embodiment of this application.

[0047] Figure 6 This is a rendering of a fiber optic drag array provided in an embodiment of this application.

[0048] Figure 7 This is a schematic flowchart illustrating a method for determining the location of a sound source, provided in an embodiment of this application. Detailed Implementation

[0049] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0050] Figure 1 This is a schematic diagram of the overall structure of an all-fiber acoustic-attitude integrated towed linear array system according to the present invention. It can be seen that the system consists of a watertight optical cable 1, a transmission optical fiber 2, a multi-core optical fiber 3, a hydrophone probe 4, a support float 5, a load-bearing rope 6, a sleeve 7, a first watertight connector 8, and a second watertight connector 9. The first and second watertight connectors 9 are located at opposite ends of the sleeve 7 and are respectively connected to the sleeve 7. The watertight optical cable 1 is housed within the first watertight connector 9. The watertight optical cable 1 branches into the transmission optical fiber 2 and the multi-core optical fiber 3 on the side closest to the sleeve 7. The transmission optical fiber 2 is connected to the hydrophone probe 4, and the multi-core optical fiber 3 is spirally wound around the outer circumference of the hydrophone probe 4 and housed within the sleeve 7.

[0051] In some embodiments, the number of fibers in the multi-core fiber 3 is greater than or equal to 3. A relatively large number of fibers allows for the inversion of the orientation shape through the misalignment between multiple fibers, which helps increase the amount of usable information in the inversion. Each core is distributed parallel to the axis of the multi-core fiber 3. Using the principle of distributed Rayleigh scattering in optical fibers, the curvature information and bending direction of each core with distance can be obtained. Substituting the curvature information and bending direction into the three-dimensional shape reconstruction model yields a three-dimensional helical shape.

[0052] In some embodiments, the hydrophone probe 4 is a fiber laser hydrophone probe or a fiber interferometric hydrophone probe. The hydrophone probe 4 is placed in the liquid or polyurethane material inside the sleeve 7, which serves to protect it and allow sound transmission. The support float 5 is made of plastic with a density less than water.

[0053] When the system's towed array is operational, two incident light sources are transmitted through watertight optical cable 1 to transmission optical fiber 2 and multi-core optical fiber 3, respectively. After receiving the underwater acoustic signal, the hydrophone probe 4 returns the light carrying sound pressure information to the modulation and demodulation unit through transmission optical fiber 2. The multi-core optical fiber 3 establishes the spatial attitude based on the established mathematical model and the principle of three-dimensional shape perception, and then fits the spatial position curve of the hydrophone. Compared with fiber optic towed arrays that invert the three-dimensional shape using fiber optic gyroscopes, the fiber optic towed array provided in this application embodiment has the characteristics of small size, high reliability, small system footprint, and relatively simple optical path components.

[0054] To facilitate the deduction of the real-time spatial coordinates of the hydrophone probe 4 based on the multi-core optical fiber 3, the multi-core optical fiber 3 can be wound in a regular spiral pattern. In some embodiments provided in this application, the multi-core optical fiber 3 may include multiple spiral sections connected end-to-end and equally spaced, with N spiral sections comprising N spiral section groups, each corresponding one-to-one with one of the N hydrophone probes 4. That is, the regular spiral winding shape of the multi-core optical fiber 3 can be divided into N parts based on its correspondence with the N hydrophone probes 4. For example, hydrophone probe 4a may correspond to spiral section group a, and hydrophone probe 4b may correspond to spiral section group b. The signal corresponding to spiral section group a can reflect the real-time spatial coordinates of hydrophone probe 4a, and the signal corresponding to spiral section group b can reflect the real-time spatial coordinates of hydrophone probe 4b.

[0055] The multi-core fiber optic triple helix installation ensures the axial flexibility of the towed array under tension, and makes it easier to invert the axial centerline equation and coordinates of the cylinder formed by the helical curve, which is more conducive to determining the position of the hydrophone probe. It avoids the irregular curve inverted by simply embedding a multi-core fiber with a margin, which can significantly reduce the difficulty of inverting the position of the hydrophone in the towed linear array, and overcomes the problem of reduced system reliability caused by the axial expansion and contraction deformation of the towed array during towing.

[0056] In some embodiments, each helical assembly includes 1 to 5 helical parts. The number of helical parts included in the helical assembly is relatively appropriate, which is beneficial for making the real-time spatial position coordinates of the hydrophone probe relatively accurate, and also for making the calculation process of the real-time spatial position relatively simple.

[0057] Combination Figures 1-3 A support float 5 is installed between two adjacent hydrophone probes 4. Figure 2 and Figure 3 As shown, the support float 5 can be cylindrical, with a diameter slightly smaller than the inner diameter of the sleeve 7 and a height greater than the inner diameter of the sleeve 7, to prevent the support float 5 from tipping over inside the sleeve 7.

[0058] The support float 5 has four holes: two support rope holes 12 for the two support ropes 6, a hydrophone probe hole 13 for the transmission optical fiber 2, and a multi-core optical fiber hole 11 for the multi-core optical fiber 3. Thus, the support float 5 can support and fix multiple components inside the sleeve 7.

[0059] The load-bearing rope 6 connects the second watertight joint 8 and the first watertight joint 9 and is placed inside the sleeve 7, so that the load-bearing rope 6 can withstand the drag force of the fiber optic tow array. The load-bearing rope 6 passes through and is fixed to the load-bearing rope hole 12 on the support float 5, so that the load-bearing rope 6 can be used to provide positioning support for multiple components within the sleeve 7. The load-bearing rope hole 12 can be located at the edge of the support float 5.

[0060] The hydrophone probe hole 13 is positioned opposite to the axis of the fiber optic towed array, and the transmission fiber 2 can pass through the hydrophone probe hole 13 and connect to the hydrophone probe 4.

[0061] The multi-core fiber optic hole 11 can be spiral-shaped to allow the multi-core fiber 3 to spirally pass through the multi-core fiber optic hole 11. The multi-core fiber optic hole 11 can be located at the edge of the supporting float 5, and the multi-core fiber optic hole 11 and the load-bearing rope hole 12 can be arranged alternately.

[0062] Combination Figure 4 , Figure 4 This invention provides various solutions for confining the hydrophone probe 4 to the axis of the fiber optic towed array.

[0063] like Figure 4 As shown in (a), the diameter of the hydrophone probe 4 can be slightly smaller than the diameter of the sleeve 7, meaning the radius difference between the hydrophone probe 4 and the sleeve 7 is less than or equal to a preset radius (e.g., 0-1 mm). A spiral groove 14 is provided on the outer periphery of the hydrophone probe 4, and the multi-core optical fiber 3 is correspondingly disposed within the spiral groove 14. That is, the multi-core optical fiber 3 can be wound through the spiral groove 14. This allows for a relatively accurate determination of the relative positional relationship between the multi-core optical fiber 3 and the hydrophone probe 4. The larger diameter hydrophone probe also serves as a support instead of the support float 5, meaning that the fiber optic towed array can eliminate the need for some or all of the support float 5. However, due to the lack of buffering in the hydrophone probe 4, high acceleration noise is generated during towing.

[0064] like Figure 4As shown in (b), the hydrophone probe 4 can be fitted with helically wound spring seats 15 at both ends. The hydrophone probe 4 can be clamped by the spring seats 15 at both ends and is positioned corresponding to the axis of the fiber optic towed array. The spring seats 15 are made of, for example, stainless spring steel and have a helical rigid spring-like structure. One end of the spring seat 15 is connected to the hydrophone probe 4, and the other end is connected to the support rope 6. The helical radius of the spring seat 15 gradually increases in the direction from the hydrophone probe 4 to the support rope 6. In some other embodiments, the spring seat 15 can be provided only on one side of the hydrophone probe 4.

[0065] The spring seat 15 acts as a buffer, while also ensuring that the hydrophone probe 4 is better fixed on the center line, which is more conducive to the matching of the multi-core fiber positions. However, the material of the spring seat 15 is relatively hard, and the spring seat 15 also increases the length of the probe accordingly, reducing the bending radius of the drag array.

[0066] like Figure 4 As shown in (c), the fiber optic towed array also includes a flexible sleeve 10. The two ends of the hydrophone probe 4 are flexibly connected to the support rope 6 via the flexible sleeve 10. The flexible sleeve 10, through heat shrinking, limits the hydrophone probe 4 to the axis of the fiber optic towed array. Specifically, the flexible sleeve 10 is fixed to the hydrophone probe 4, and two flexible antennas 16 are provided at the end of the flexible sleeve 10 away from the hydrophone probe 4. These two flexible antennas 16 are fastened to the support rope 6. In some embodiments, the two flexible antennas 16 can be symmetrically arranged, and each flexible antenna 16 can be fastened to two symmetrically arranged support ropes 6. Compared with relatively rigid connection methods, the flexible connection method achieved through the flexible antennas 16 and the flexible sleeve 10 can act as a buffer during towing, thereby reducing the acceleration noise of the hydrophone probe 4, and also increasing the installation space for the multi-core optical fiber 3.

[0067] In some other embodiments, the flexible sleeve 10 and flexible antenna 16 may be provided only on one side of the hydrophone probe 4.

[0068] Combination Figures 5-6 The figures represent the spatial curves and yz-plane curves of the implementation effect of this invention. When the towed array is towed in the water, it will be affected by ocean currents, organisms, etc. Therefore, the working conditions under non-linear towing are simulated. The "-line" curve is the spatial attitude curve of the multi-core optical fiber constructed using a mathematical model, and the "*" sign is the fitted position, that is, the position of the hydrophone probe.

[0069] Figure 7 This is a schematic flowchart illustrating a method for determining the location of a sound source according to an embodiment of this application. Figure 7 The method shown can be applied to Figure 1 The fiber optic drag array shown.

[0070] 110. Based on the signal fed back by the multi-core fiber 3, obtain the real-time attitude curve f(x1,y1,z1,t) of the multi-core fiber 3.

[0071] In some embodiments, the real-time attitude curve f(x1,y1,z1,t) can be as follows: Figure 5 , Figure 6 The curve is shown in the figure. The drift change of the return wavelength of the multi-core fiber can be used to obtain parameters such as the bending curvature, bending direction and deflection of each point of the fiber based on the optical frequency domain reflectometer. Then, by combining the Frenet-Serret equation of the three-dimensional spatial curve, the real-time attitude curve f(x1,y1,z1,t) of the multi-core fiber in the towed array can be reconstructed.

[0072] 120. Based on the positional relationship between multiple hydrophone probes 4 and the multi-core optical fiber 3 and the real-time attitude curve f(x1,y1,z1,t), the real-time spatial position coordinates x of the hydrophone probe 4 are obtained. i ,y i ,z i Where i represents the position number of different hydrophone probes 4. That is, by referring to the known hydrophone spacing and the corresponding positional relationship with each segment of multi-core optical fiber, the spatial coordinate x of the hydrophone probe at time t is obtained. i ,y i ,z i .

[0073] In some embodiments, the real-time spatial curve f(x,y,z,t) of the fiber-towed linear array is obtained based on the real-time attitude curve f(x1,y1,z1,t). The real-time spatial curve f(x,y,z,t) can be a curve passing through a path such as... Figure 5 , Figure 6 The curve marked with an asterisk (*) is then used. Next, based on the positional relationship between the multiple hydrophone probes 4 and the multi-core optical fiber 3, and the real-time spatial curve f(x,y,z,t), the real-time spatial coordinate x is determined. i ,y i ,z i .

[0074] For example, based on one or more helical sections of the multi-core optical fiber 3 corresponding to each hydrophone probe 4, the real-time spatial position coordinate x is selected on the real-time spatial curve f(x,y,z,t). i ,y i ,z i .

[0075] 130, based on real-time spatial location coordinates x i ,y i ,z i The location of the sound source is determined by the signal fed back from the hydrophone probe 4.

[0076] In some embodiments, a geodetic coordinate system E-XYZ and a towed array attitude coordinate system O-xyz can be established before step 110; and the real-time spatial position coordinates x of the hydrophone probe 4 can be obtained in the towed array attitude coordinate system O-xyz. i ,y i ,z i ; Utilizing the real-time spatial position coordinates x of the hydrophone probe i ,y i ,z i By converting the position into the geodetic coordinate system E-XYZ, and combining the GPS / BeiDou latitude and longitude information on the unmanned platform with the underwater acoustic signal collected by the hydrophone probe at time t, the location of the target sound source can be determined.

[0077] After the above method, the modulation and demodulation unit will store several data packets of underwater acoustic information and hydrophone position information corresponding to the time information. That is, each point in time will correspond to different underwater acoustic information and hydrophone position information, so as to obtain effective data within the towed detection time period and thus achieve the purpose of integrated acoustic and attitude detection.

[0078] This application also provides an electronic device for performing, such as Figure 7 The method for determining the location of a sound source is shown. The electronic device may include: one or more processors; one or more memories; the one or more memories storing one or more computer programs, the one or more computer programs including instructions that, when executed by the one or more processors, cause the electronic device to perform actions such as... Figure 7 The method shown is for determining the location of a sound source.

[0079] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A fiber-optic dragged linear array, characterized in that, include: Watertight optical cable (1), transmission optical fiber (2), multi-core optical fiber (3), multiple hydrophone probes (4), sleeve (7), first watertight connector (9); The first watertight connector (9) is installed in conjunction with the sleeve (7). The watertight optical cable (1) is provided inside the first watertight connector (9). The watertight optical cable (1) branches into the transmission optical fiber (2) and the multi-core optical fiber (3) on the side near the sleeve (7). The transmission optical fiber (2) is connected to the hydrophone probe (4). The multi-core optical fiber (3) is spirally wound around the outer periphery of the hydrophone probe (4) and housed in the sleeve (7). The multi-core optical fiber (3) includes multiple spiral sections that are connected end to end and are equally spaced. The multiple spiral sections include N spiral section groups. The N spiral section groups correspond one-to-one with the N hydrophone probes (4). Each spiral section group includes 1 to 5 spiral sections. A support float (5) is provided between two adjacent hydrophone probes (4). The support float (5) is provided with a spiral multi-core fiber optic hole (11). The multi-core fiber optic hole (11) is located at the edge of the support float (5). The multi-core fiber (3) spirally passes through the multi-core fiber optic hole (11). A second watertight connector (8) is provided on the side of the sleeve (7) away from the first watertight connector (9). The fiber optic towed array also includes a load-bearing rope (6), which is connected between the second watertight connector (8) and the first watertight connector (9) and is placed inside the sleeve (7); The support float (5) also includes a load-bearing rope hole (12), which is located at the edge of the support float (5). The load-bearing rope (6) passes through the load-bearing rope hole (12) and is fixed to the load-bearing rope hole (12).

2. The fiber optic towed array according to claim 1, characterized in that, The supporting float (5) is also provided with a hydrophone probe hole (13), which is arranged opposite to the axis of the fiber optic towed array, and the transmission fiber (2) passes through the hydrophone probe hole (13).

3. The fiber optic towed array according to claim 2, characterized in that, The fiber optic towed array also includes a flexible sleeve (10), which is fixed to the hydrophone probe (4). The flexible sleeve (10) also includes two symmetrically arranged flexible antennas (16), which are respectively fastened to two symmetrically arranged load-bearing ropes (6). The two flexible antennas (16) are used to align the hydrophone probe (4) with the axis of the fiber optic towed array.

4. The fiber optic towed array according to claim 3, characterized in that, The fiber optic towed array also includes a spirally wound spring seat (15). One end of the spring seat (15) is connected to the hydrophone probe (4), and the other end is connected to the load-bearing rope (6). In the direction from the hydrophone probe (4) to the load-bearing rope (6), the spiral radius of the spring seat (15) gradually increases. The spring seat (15) is used to align the hydrophone probe (4) with the axis of the fiber optic towed array.

5. The fiber-optic towed array according to claim 4, characterized in that, The radius difference between the hydrophone probe (4) and the sleeve (7) is less than or equal to the preset radius. The outer periphery of the hydrophone probe (4) is provided with a spiral groove (14), and the multi-core optical fiber (3) is correspondingly arranged in the spiral groove (14).

6. The fiber optic towed array according to claim 5, characterized in that, The number of optical fibers in the multi-core optical fiber (3) is greater than or equal to 3.

7. A method for determining the location of a sound source, characterized in that, The method is applied to the fiber-optic dragged line array as described in claim 6, and the method includes: Based on the signal fed back by the multi-core optical fiber (3), the real-time attitude curve of the multi-core optical fiber (3) is obtained. ; Based on the positional relationship between the multiple hydrophone probes (4) and the multi-core optical fiber (3) and the real-time attitude curve Obtain the real-time spatial coordinates of the hydrophone probe (4). ,in i The positions of different hydrophone probes (4) are labeled; Based on the real-time spatial coordinates The location of the sound source is determined by the signal fed back from the hydrophone probe (4).

8. The method according to claim 7, characterized in that, The positional relationship between the plurality of hydrophone probes (4) and the multi-core optical fiber (3) and the real-time attitude curve are used as the basis for the calculation. Obtain the real-time spatial coordinates of the hydrophone probe (4). ,include: According to the real-time attitude curve Obtain the real-time spatial curve of the fiber optic towed array. ; Based on the positional relationship between the multiple hydrophone probes (4) and the multi-core optical fiber (3) and the real-time spatial curve Determine the real-time spatial location coordinates .

9. The method according to claim 8, characterized in that, The positional relationship between the plurality of hydrophone probes (4) and the multi-core optical fiber (3) and the real-time spatial curve are used as the basis for this. Determine the real-time spatial coordinates of the hydrophone probe (4). ,include: Based on one or more helical sections of the multi-core optical fiber (3) corresponding to each of the hydrophone probes (4), in the real-time spatial curve The above selects the real-time spatial location coordinates .

10. An electronic device, characterized in that, The electronic device is used to perform the method as described in claim 9.

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