CN213301454U - Anti-submarine early warning front end array based on optical fiber acoustic wave sensing and array and system thereof - Google Patents
Anti-submarine early warning front end array based on optical fiber acoustic wave sensing and array and system thereof Download PDFInfo
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Abstract
The anti-diving early warning front end array based on optical fiber sound wave sensing and the array and the system thereof comprise a fixing unit consisting of an anchor, a diving mark and a cable; the sensing optical cables continuously extend vertically and horizontally along the fixing units, so that a two-dimensional detection array plane is formed on the offshore bottom layer, two-dimensional arrangement of approximate square wave signals of the sensing optical cables in an xz plane is realized, and the system also comprises a submarine workstation, a buoy and a signal transmission cable; the reflected light signal of the sensing optical cable is demodulated to obtain the azimuth, the movement speed and the direction information of the detection target, and the information is sent to the buoy and then sent back to the ground shore station through the satellite. The utility model discloses combine together distributed optical fiber sound wave sensing technique and anti-dive detection demand, propose to lay full fine long distance distributed underwater sound along the leading sea border line and listen real-time early warning system, can realize the early warning in advance to the submarine that invades china's ocean boundary, can be real-time and accurate location submarine position, reduce anti-dive and survey the cost, improve anti-dive operating efficiency, defend china's ocean rights and interests.
Description
Technical Field
The utility model relates to an anti-latent early warning array and system, concretely relates to anti-latent early warning front end array and system based on optic fibre sound wave sensing.
Background
The optical fiber hydrophone is an underwater acoustic signal detector based on optical fiber sensing and photoelectronic technology, and is one of the most studied anti-submarine means in various countries at present. The underwater acoustic signals are converted into optical signals by a high-sensitivity optical fiber coherent detection technology, and the optical signals are transmitted to a signal processing system by optical fibers to obtain acoustic information. The optical fiber hydrophone can effectively overcome the problems that a large number of underwater electronic elements and signal transmission cables are needed in a traditional sonar system, the price is high, the weight is large, the sealing performance is poor and the like, and improves the detection precision of underwater acoustic signals and the stability of the system. However, the hydrophone is only suitable for local point detection under sea, and general optical fiber hydrophones are easy to unbalance an optical system when forming a chain structure, so that the detection performance of the system is influenced, and the requirement on the balance of the system greatly increases the manufacturing cost and the manufacturing difficulty of the system; for interferometric hydrophones, cascading sensors into chains can weaken the signal, affecting detection. Therefore, in order to overcome the defects of the prior art, a new anti-diving scheme needs to be developed.
Disclosure of Invention
The utility model aims at providing an anti-latent early warning front end array and system based on optic fibre sound wave sensing to overcome prior art's not enough.
The remote advanced anti-submarine early warning front-end array based on distributed optical fiber acoustic wave sensing is characterized by comprising a plurality of underwater fixing units which are arranged in a line, wherein each fixing unit consists of an anchor and a submerged buoy, and the anchors and the submerged buoys are connected with each other through cables;
the connecting part of the cable and the anchor is provided with a fixed point of a sensing optical cable, and the cable above the fixed point is also provided with a plurality of lifting points;
the starting end of the sensing optical cable extends upwards to a pulling point at the highest position of the first fixing unit from the fixing point of the first fixing unit; then transversely extends to the highest lifting point of the second fixing unit and then extends downwards to the fixing point of the second fixing unit; then laterally to the fixing point of the next fixing element, …, and so on, until it extends from the highest lifting point of the last fixing element down to the fixing point of the bottom of the fixing element, or from the fixing point of the bottom of the last fixing element up to the highest lifting point of the fixing element;
the height H of the vertical part of the sensing optical cable on each cable section needs to meet the following conditions: the height of H is 1/3-1/2 of the water depth; and the submerged buoy is at least 3 meters below the water surface;
the length of the transverse part of the sensing optical cable between two adjacent fixing units meets the following conditions: is 2 times longer than the larger of the two vertical portions (to prevent the two erected portions from tangling).
The front-end sensing array comprises a plurality of submerged buoy systems and sensing optical cables, the submerged buoy systems are used for fixing the sensing optical cables at corresponding positions according to preset lengths L and ensuring that the sensing optical cables with the height of H are vertically pulled up, when the underwater optical cables are laid on the seabed, fixing and a plurality of lifting points are arranged along cables, and the optical cables with the lengths of L are fixed on the seabed in an anchoring mode at fixed points; at the pull point, the cable is pulled up by a height H using a submerged buoy. The sizes of H and L are adjusted in advance according to the depth of a target sea area to construct a front-end sensing array, and then a two-dimensional detection array plane is formed on an offshore bottom layer, so that two-dimensional arrangement of sensing optical cables in an xz plane in approximate square wave signals is realized, and a physical basis is provided for subsequent acoustic signal positioning.
The remote advanced anti-submarine early warning array based on distributed optical fiber sound wave sensing is characterized in that a floating ball for preventing the sensing optical cable from falling is further arranged on the transverse portion of the sensing optical cable between two adjacent fixing units.
The remote advanced anti-submarine early warning array based on distributed optical fiber acoustic wave sensing is characterized in that a Kevlar net is additionally arranged outside a sensing optical cable, Kevlar lock catches are arranged on the Kevlar net at intervals, and the sensing optical cable is fixed on the cable through the Kevlar lock catches.
The remote advanced anti-submarine early warning array based on distributed optical fiber acoustic wave sensing is characterized by comprising a light source and a plurality of underwater fixing units which are arranged in a line, wherein each fixing unit consists of an anchor and a submerged buoy, and the anchors and the submerged buoys are connected with each other through cables;
the connecting part of the cable and the anchor is provided with a fixed point of a sensing optical cable, and the cable above the fixed point is also provided with a plurality of lifting points;
the sensing optical cable starts from a light source positioned at the seabed and is firstly connected to a lifting point at the highest position of the first fixing unit; then transversely extends to the highest lifting point of the second fixing unit and then extends downwards to the fixing point of the second fixing unit; then laterally to the fixing point of the next fixing element, …, and so on, until it extends from the highest lifting point of the last fixing element down to the fixing point of the bottom of the fixing element, or from the fixing point of the bottom of the last fixing element up to the highest lifting point of the fixing element;
the height H of the vertical part of the sensing optical cable on each cable section needs to meet the following conditions: the height of H is smaller than 1/3-1/2 of the water depth; and the submerged buoy is at least 3 meters below the water surface;
the length of the transverse part of the sensing optical cable between two adjacent fixing units meets the following conditions: the length is more than 2 times of the larger H of the two vertical parts (preventing the two upright parts from being wound) and less than 3 times of the larger H (preventing the L0 from being overlong to cause sagging).
The remote advanced anti-submarine early warning array based on distributed optical fiber acoustic wave sensing is characterized by comprising two independent early warning arrays positioned on two sides of a light source, wherein the two sensing arrays are distributed in an XZ plane by taking the light source positioned at the bottom of the sea as a center.
The remote advanced anti-submarine early warning array based on distributed optical fiber sound wave sensing is characterized in that a floating ball for preventing the sensing optical cable from falling is further arranged on the transverse portion of the sensing optical cable between two adjacent fixing units.
The remote advanced anti-submarine early warning array based on distributed optical fiber acoustic wave sensing is characterized in that a Kevlar net is additionally arranged outside a sensing optical cable, Kevlar lock catches are arranged on the Kevlar net at intervals, and the sensing optical cable is fixed on the cable through the Kevlar lock catches.
The remote advanced anti-submarine early warning system based on the distributed optical fiber acoustic wave sensing technology comprises an anti-submarine early warning array, a submarine workstation, a buoy and a signal transmission cable;
the seabed workstation comprises a light source module, a demodulation module, a transmitting module, a power supply module and a circulator, is a transfer station for generating, demodulating and processing underwater optical signals, and simultaneously provides electric energy for the system to ensure the normal operation of the system; and the light sources of the early warning array are integrated in the light source module,
light pulse emitted by a light source enters a front end array through a circulator after being modulated, amplified and filtered, echo signals collected by the front end array enter a demodulation module through the circulator, and are demodulated after being amplified, filtered and subjected to photoelectric detection in sequence;
the buoy floats on the sea surface, is connected with the seabed workstation through the signal transmission cable, acquires data, compresses and encrypts the data, sends information transmitted by the seabed workstation to the satellite in real time through the antenna, and the satellite forwards the information to the signal receiving station on the land to finish the information transmission.
The buoy adopts a large buoy platform, the energy sources of the large buoy platform come from solar energy, wind energy, a storage battery, a diesel generator and the like, and the power supply requirement of the system can be guaranteed by multiple comprehensive energy supply modes.
A floating ball can be arranged on the signal cable to provide buoyancy, so that the signal cable is prevented from falling.
Light signals emitted by a light source module in the submarine workstation sequentially pass through the submarine tiled sensing cables and the sensing cables in the pull-up unit along the sensing optical cables and circulate to a sensing cable terminal, reflected light signals of the light signals are fed back to a demodulation module of the submarine workstation in real time, a large amount of feedback data are subjected to photoelectric conversion and then subjected to signal analysis and processing to obtain key information such as the direction, the movement speed and the direction of a detection target, the information is transmitted to a buoy data acquisition center through the transmitting module via the transmission optical cables, and the information is compressed, encrypted and transmitted to a ground shore station via a satellite.
The application of the system is characterized in that the system is applied to detecting the direction and the distance of an underwater sailing object.
The utility model discloses a system uses the optical time domain/frequency domain reflection (OTDR/OFDR) technique based on rayleigh effect, raman effect and brillouin effect, especially coherent optical time domain reflection (C-OTDR), phase sensitive optical time domain reflection (phi-OTDR) and brillouin scattering sensing technique, in the application of surveying under water navigation thing position and distance.
Advantages of the invention
The utility model discloses introduce marine environment safety monitoring field with optic fibre DAS technique to combine together with large-scale buoy platform, sea buoy platform passes through the photoelectric transmission cable and supplies power to seabed work platform, and the data of seabed workstation collection then passes through the information receiving platform that photoelectric transmission cable direct transmission arrived sea buoy, and the basic station is transfered to the rethread satellite, has solved the power supply of system in the deep ocean and the difficult problem of signal transmission. The underwater three-dimensional array advanced anti-submarine early warning method based on the optical fiber DAS technology is further combined with a three-dimensional positioning algorithm, one-dimensional monitoring on land is expanded to underwater three-dimensional monitoring, early warning depth can be expanded, early warning efficiency is improved, operation cost is saved, and the method has important significance for casting underwater great wall in China and improving national defense safety.
The utility model discloses a distributed optical fiber acoustic wave sensing (DAS) is a technique that is particularly suitable for remote real-time measurement, has advantages such as long distance, distributed, real-time quantitative determination that developments are met an emergency. The coherent optical time domain reflectometer (C-OTDR), the phase-sensitive optical time domain reflectometer (phi-OTDR) and the Brillouin scattering sensor are effective vibration detection technologies, can measure information such as vibration position, frequency, amplitude, phase and the like, and have wide application prospects in the fields of security monitoring of important places and major infrastructure, health monitoring of large-scale structures, oil and gas resource exploration and the like.
The existing optical fiber DAS system is mainly applied to land, and certain guarantee is provided for system power supply and signal real-time transmission. In order to increase strategic depth, the optical fiber DAS underwater early warning system is often deployed in a place far away from the shore and the island, and cannot take power from the land and directly transmit signals by using a roadbed shore station. The biggest difficult problem that provides incessant electric power and information real-time transmission and become system application face for the continuous observation, the utility model provides an utilize large-scale buoy platform to solve system power supply and information transmission's scheme, this difficult problem of solution that can be fine. In addition, the application of the existing optical fiber DAS mainly depends on large-scale structures on land such as oil-gas pipelines, bridges and the like to carry out detection in the aspect of one-dimensional arrays, and the research on the aspect of three-dimensional detection is less. Therefore, the utility model discloses not only provide a new anti-latent early warning system, and extended the application of optic fibre DAS technique.
Drawings
Fig. 1 is a schematic diagram of the general structure of the anti-diving early warning system of the present invention.
Fig. 2 is a partial enlarged view of the front end array of the present invention.
Fig. 3 is a schematic diagram of the optical fiber sensing optical path of the present invention.
Fig. 4 is a schematic representation of URFL cavity assisted phi-OTDR.
Fig. 5 is a schematic view of the positioning method of the present invention.
The system comprises a front-end array 1, a submerged buoy 101, a cable 102, an anchor 103, a transverse floating ball 104, a sensing optical cable 105, a lifting point 106, a fixed point 107, a Kevlar lock catch 108, a Kevlar net 109, a seabed workstation 2, a light source module 201, a demodulation module 202, a transmitting module 203, a power supply module 204, a buoy 3, a signal transmission cable 4, a floating ball 5, a satellite 6 and a signal receiving station 7.
Detailed Description
1. Early warning system composition
The utility model provides a remote advance anti-latent early warning system based on distributed optical fiber sound wave sensing technology is applied to the safety monitoring field of our country's land of leading with optic fibre DAS technique, realizes in time discovering, location and the early warning to invading submarine. Fig. 1 shows a schematic composition diagram of an optical fiber DAS underwater acoustic detection real-time early warning system.
The early warning system includes: a subsea workstation 2, a front end array 1, a buoy 3 and a signal transmission cable 4. The seabed workstation 2 comprises a light source module 201, a demodulation module 202, a transmitting module 203 and a power supply module 204, is a transfer station for generating, demodulating and processing underwater optical signals, and simultaneously provides electric energy for the system to ensure the normal operation of the system. The front-end sensing array is divided into two independent sensing arrays which are symmetrical left and right, and the two sensing arrays are linearly arranged in an xy plane by taking the seabed workstation 2 as a center. Each front-end sensing array comprises a plurality of submerged buoy systems and a sensing optical cable 105, the submerged buoy systems are used for fixing the sensing optical cable 105 at corresponding positions according to a preset length L and ensuring that the sensing optical cable 105 with the height H is vertically pulled up, two-dimensional arrangement of the sensing optical cables 105 in an xz plane in approximate square wave signals is realized, and a physical basis is provided for subsequent acoustic signal positioning. The buoy 3 floats on the sea surface, is connected with the seabed workstation 2 through the signal transmission cable 4, acquires data, compresses and encrypts the data, sends information transmitted by the seabed workstation 2 to the satellite 6 in real time through an antenna, and the satellite 6 forwards the information to the signal receiving station 7 on the land to finish information transmission.
Referring to fig. 2, the front array 1 is formed by weaving a layer of kevlar rope outside the submarine optical cable to protect the optical cable and reserve the stressed cables 102 at regular intervals. When laying an underwater cable on the seabed, a plurality of fixing and pulling points 106 are established along the cable. Fixedly coupling the optical cable with the length L to the seabed in a mode of anchoring by using an anchor 103 on a fixed point 107; at the pull point 106, the cable is pulled up to a height H using the submerged buoy 101. The sizes of H and L are adjusted in advance according to the depth of a target sea area to construct a front-end sensing array, and a two-dimensional detection array plane is formed on an offshore bottom layer. The energy sources of the large buoy platform are solar energy, wind energy, a storage battery, a diesel generator and the like, and the power supply requirement of the system can be guaranteed by comprehensively supplying energy in various modes.
The optical fiber DAS technology in the early warning system refers to an optical time domain/frequency domain reflectometry (OTDR/OFDR) technology based on the rayleigh effect, the raman effect, and the brillouin effect, and includes but is not limited to: coherent optical time domain reflectometry (C-OTDR), phase sensitive optical time domain reflectometry (phi-OTDR), and Brillouin scattering sensing techniques.
The early warning system adopts the ultra-long Raman fiber laser cavity (URFL) technology, and by Raman bidirectional pumping, the front end and the rear end of the optical fiber are provided with pump light input, so that higher signal gain can be provided for the system, and ultra-long distance optical fiber sensing is realized. And uses a balanced detection technique to reduce the effect of Relative Intensity Noise (RIN).
The early warning system estimates the direction of arrival based on an ESPRIT algorithm and analyzes and corrects array orientation errors.
The early warning system adopts a vector array mode of a spherical intersection method to carry out signal source positioning.
Key components and system performance parameters adopted in the early warning system are as follows: (1) the coupler is a 3dB coupler, and the splitting ratio is 50: 50; (2) the wavelength of the Raman pump is 1365 nm; (3) FBG1 has the same wavelength as FBG 2; (4) the values of H and L in FIG. 1 can be adjusted according to the water depth and the submarine topography; (5) the total length of the single-arm front-end sensing array is more than 100 km.
2. Principle of operation
The utility model discloses in optic fibre DAS technique includes: an optical time domain/frequency domain reflectometry (OTDR/OFDR) technology based on Rayleigh effect, Raman effect and Brillouin effect, in particular to a coherent optical time domain reflectometry (C-OTDR), a phase sensitive optical time domain reflectometry (phi-OTDR) and a Brillouin scattering sensing technology. The following examples only use the Φ -OTDR technique as an example, but the scope of the present invention is not limited thereto.
2.1 phi-OTDR working principle
The phi-OTDR is a distributed optical fiber sensor for performing space positioning based on the OTDR positioning principle, and when optical pulses generated by a high-coherence narrow-linewidth light source are transmitted in an optical fiber, scattered lights at different positions meet and interfere with each other. During the forward progress of the light pulse, backscattered light is continuously generated and propagates backwards. When disturbance exists on the optical fiber, the refractive index of the optical fiber is changed due to the elasto-optic effect, the change of the refractive index can directly cause the phase change of the scattered light, the phase change of the scattered light is in direct proportion to the change of an external physical quantity, and the phase change of the scattered light and the change of the external physical quantity have linear positive correlation, so that the phase information of the scattered light can be demodulated, a target signal can be restored, and quantitative detection can be realized on the strength of the target signal.
Specifically, in a phi-OTDR system, a narrow linewidth laser emits continuous light, the continuous light is modulated into pulse light by an acousto-optic modulator, the pulse light is amplified by an EDFA and then injected into a sensing optical fiber through a circulator, the light wave transmitted in the sensing optical fiber generates Rayleigh scattering due to the uneven refractive index of the optical fiber, the backward Rayleigh scattering light returns to the circulator through the optical fiber again, the backward Rayleigh scattering light passes through a photoelectric detector and then is subjected to AD acquisition, and a digital signal is transmitted to a computer for subsequent processing. When the optical fiber is invaded (disturbed) at a certain position on the line, the refractive index of the optical fiber and the length of the optical fiber at the position are changed, so that the refractive index of the optical fiber and the length of the optical fiber at the position are changed, the phase of backward Rayleigh scattering at the position is modulated, and finally the backward Rayleigh scattering power detected by the photoelectric detector is changed. The basic structure of the demodulation system is shown in fig. 3.
2.2 ultra-long Raman fiber laser cavity (URFL) technique
In order to further improve early warning system performance, realize that the system obtains farther detection distance under close spatial resolution and detectivity, the utility model discloses an overlength raman fiber laser cavity (URFL) technique through the two-way pumping of raman, and both ends all have the input of pump light around the optic fibre, can provide higher signal gain for the system, have positive effect to realizing the sensing of overlength distance optic fibre. Meanwhile, in order to avoid amplifying noise, the semiconductor optical amplifier and the optical switch are utilized to greatly reduce the in-band coherent noise of the device, and the balance detection technology is utilized to further reduce the relative intensity noise transmitted by the Raman pump and improve the signal-to-noise ratio of the system. An experimental setup for a very long raman fiber laser cavity (URFL cavity) assisted phi-OTDR is shown in fig. 4.
2.3 Direction of arrival estimation based on ESPRIT Algorithm
The direction of arrival estimate is primarily used as the orientation of the array signal. There are many possible propagation paths and angles of arrival for a source. If several transmitters are operating simultaneously, each source forms a potential multipath component at the sensor array. It is therefore important to estimate these angles of arrival by direction-of-arrival localization techniques in order to estimate the location of the acoustic source in operation and the direction in which the transmitter is located.
For the quick processing of array signal, the utility model discloses a rotation invariant subspace method (ESPRIT), this kind of algorithm thought is that will receive the array and divide into two completely unanimous position translation's subarray on the geometry, has the translation invariance between two subarrays, and the interval delta of two subarrays is known. The difference between the incident angles of the signal sources on the two sub-arrays is only one rotation invariant factor, the rotation invariant factor comprises the arrival angle information of each incident signal, and the signal sources can be obtained by solving a generalized eigenvalue equation.
2.4 analysis and correction of array orientation errors
The array error correction is mainly used to further correct the direction of arrival estimate. In practical application, due to the influence of factors such as an optical fiber manufacturing process, distribution position deviation and the like, errors are inevitable, and the array flow pattern has certain deviation, performance deterioration and even failure. For the vector array, because each array element has directivity, the error of each array element also has directivity, and the error of a single vector array element and the array error are divided into an amplitude error, a phase error, an array element position error and a mutual coupling error between the array elements. In fact, all errors can be attributed to the amplitude error and the phase error of the vector array channel, wherein the amplitude error changes the eigenvalue of the array reception covariance matrix, further changes the spectrum peak height in the spectrogram, increases the main peak width, raises the side lobe height, and the phase error changes the eigenvector of the reception matrix, so that the maximum value of the spectrogram shifts, which brings estimation deviation, and the error problem of the array can be solved by using the classical self-correction algorithm of the sound pressure array error.
2.5 vector array positioning based on spherical intersection method
After the arrival direction information is acquired, the array signals in two orthogonal directions are subjected to a series of processing, and finally the position of the target sound source is calculated. Specifically, 3 array elements in two array directions are taken out, and positioning of the target is achieved through a spherical intersection method. Setting the array elements to be placed at any position, as shown in FIG. 5, placing No. 1 array element at the origin as the reference point, (x)i，yi， zi) Indicating the coordinates of the ith sensor (z when lying on a plane xOy i0, i is 1, 2, …, n), (x, y, z) denotes the coordinates of the sound source S, riDenotes the distance of the sound source S from the i-th sensor, v is the speed of sound propagation, t0For the moment at which the sound source S starts to emit a signal, tiThe time when the ith sensor receives the signal can be obtained according to the time delay of the signals received by the sensors at different positionsThe mathematical model to which the localization is
Wherein epsiloniFor model error, τ i ═ ti-t0。
When the number of the array elements is 3, an equation set can be obtained:
after simplification, the following is obtained:
note the book
Then
From the first two equations:
substituting it into the last equation, solving to get:
square arrangement:
namely, it is
az2+bz+c＝0 (9)
Obtaining by solution:
from the above derivation, the model requires at least 3 sensors to calculate the sound source coordinates (x, y, z) (when more than 3, the least squares solution can be obtained), but it needs to record t0And tiThis requires a high response speed of the demodulation apparatus.
3. Description of the working Process
The light source module 201 located in the subsea workstation 2 emits pulsed laser signal light through the circulator, in turn, to all over the sensing cable 105 in the front end sensing array. Meanwhile, rayleigh backscattered light caused by external vibration is transmitted to the demodulation module 202 along the sensing optical cable 105. After being processed by the demodulation module 202, the data is transmitted to the buoy 3 through the transmission module 203 via the signal transmission cable 4, and the signal is transmitted to the user shore station in real time by the satellite 6.
Claims (4)
1. The remote advanced anti-submarine early warning front-end array based on distributed optical fiber acoustic sensing is characterized by comprising a plurality of underwater fixing units which are arranged in a line, wherein each fixing unit consists of an anchor (103) and a submerged buoy (101), and the anchor (103) and the submerged buoy (101) are connected with each other through a cable (102);
a fixed point (107) of the sensing optical cable (105) is arranged at the joint of the cable (102) and the anchor (103), and a plurality of pulling points (106) are arranged on the cable (102) above the fixed point (107);
the starting end of the sensing optical cable (105) extends from a fixed point (107) of the first fixed unit to a pulling point (106) at the highest position of the first fixed unit; then transversely extends to the highest lifting point (106) of the second fixing unit and then downwards extends to the fixing point (107) of the second fixing unit; then transversely extending to the fixing point (107) of the next fixing unit, and the like, and extending from the lifting point (106) at the highest position of the last fixing unit to the fixing point (107) at the bottom of the fixing unit downwards, or extending from the fixing point (107) at the bottom of the last fixing unit to the lifting point (106) at the highest position of the fixing unit upwards;
the height H of the vertical part of the sensing optical cable (105) on each cable section meets the following conditions: the height of H is 1/3-1/2 of the water depth; and the submerged buoy (101) is at least 3 meters below the water surface;
the length L of the transverse part of the sensing optical cable (105) between two adjacent fixing units meets the following condition: the length of L is 2 times greater than the larger of H in the vertical portions on both sides thereof.
2. A remote advance anti-dive early warning array based on distributed optical fiber acoustic sensing, characterized by comprising a light source and a front end array as claimed in claim 1, wherein the sensing optical cable (105) is connected to a pull-up point (106) at the highest of the first fixed unit from the light source located at the sea bottom.
3. A remote advance anti-dive pre-warning array based on distributed fiber optic acoustic sensing as claimed in claim 2, wherein said array comprises two independent front arrays on both sides of the light source, and the two front arrays are distributed in the XZ plane with the light source on the sea bottom as the center.
4. A remote advanced anti-submarine early warning system based on a distributed optical fiber acoustic wave sensing technology is characterized by comprising the anti-submarine early warning array according to claim 3, a submarine workstation (2), a buoy (3) and a signal transmission cable (4);
the seabed workstation (2) comprises a light source module (201), a demodulation module (202), a transmitting module (203), a power supply module (204) and a circulator, is a transfer station for generating, demodulating and processing underwater optical signals, and simultaneously provides electric energy for the system to ensure the normal operation of the system; and the light sources of the early warning array are integrated in the light source module (201),
light pulse emitted by the light source enters the front end array through the circulator after being modulated, amplified and filtered, echo signals collected by the front end array enter the demodulation module (202) through the circulator, and are demodulated after being amplified, filtered and subjected to photoelectric detection in sequence;
the buoy (3) floats on the sea surface, is connected with the seabed workstation (2) through the signal transmission cable (4), acquires data, compresses and encrypts the data, sends information transmitted by the seabed workstation to the satellite (6) in real time through the antenna, and the satellite forwards the information to the signal receiving station (7) on the land to complete information transmission.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983563A (en) * | 2020-08-30 | 2020-11-24 | 山东省科学院海洋仪器仪表研究所 | Remote advanced anti-submarine early warning array and system based on distributed optical fiber acoustic wave sensing |
| CN113376579A (en) * | 2021-06-23 | 2021-09-10 | 华中科技大学 | Underwater sound source positioning and signal acquisition method based on distributed sound wave sensing technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983563A (en) * | 2020-08-30 | 2020-11-24 | 山东省科学院海洋仪器仪表研究所 | Remote advanced anti-submarine early warning array and system based on distributed optical fiber acoustic wave sensing |
| CN111983563B (en) * | 2020-08-30 | 2023-02-21 | 山东省科学院海洋仪器仪表研究所 | Remote advanced anti-submarine early warning array and system based on distributed optical fiber acoustic wave sensing |
| CN113376579A (en) * | 2021-06-23 | 2021-09-10 | 华中科技大学 | Underwater sound source positioning and signal acquisition method based on distributed sound wave sensing technology |
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