CN116865876A - Duplex metamaterial underwater signal transmission system for sonar buoy - Google Patents
Duplex metamaterial underwater signal transmission system for sonar buoy Download PDFInfo
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- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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Abstract
The invention provides a duplex metamaterial underwater signal transmission system for a sonar buoy, which belongs to the technical field of underwater communication, and adopts a strong scattering underwater sound metamaterial-local interference suppression algorithm to jointly cancel a near-end strong self-interference signal, adopts the strong scattering underwater sound metamaterial in the space dimension to perform self-interference signal isolation, and adopts a local interference suppression filtering algorithm to cancel a residual self-interference signal for an isolated received signal. The duplex metamaterial underwater signal transmission system for the sonar buoy provided by the invention adopts the sound insulation metamaterial with small volume and light weight, is combined with the local interference suppression filtering algorithm, improves the self-interference signal suppression capability of the system, is hopeful to be applied to communication scenes with severely limited frequency band resources, and provides a new thought and technology for building a novel full-duplex underwater acoustic communication system.
Description
Technical Field
The invention belongs to the technical field of underwater communication, and particularly relates to a duplex metamaterial underwater signal transmission system for a sonar buoy.
Background
In recent years, underwater acoustic communication is used as the only known reliable underwater remote information transmission technology, has been widely applied to the fields of ocean information acquisition, ocean environment monitoring, underwater information transmission and interaction and the like, and has important significance in the aspects of developing ocean resources, preventing ocean disasters, enhancing ocean safety and the like. The underwater acoustic channel has limited frequency spectrum resources, and the Doppler spread seriously causes the inefficiency of the underwater communication network and limited throughput. With the increasing demand for underwater information interaction, the underwater acoustic communication network mainly comprising half duplex cannot meet the demand for higher data transmission rate. The in-band full duplex underwater acoustic communication has extremely high research significance and application value for underwater acoustic communication application scenes with severely limited frequency spectrum resources, and is one of research hotspots in the underwater communication field.
The key problem of the in-band full duplex underwater acoustic communication technology is to inhibit or cancel strong self-interference signals emitted by a local near end, so that a signal receiving system of the near end can be ensured to successfully receive and demodulate weak communication signals from a far end. At present, the self-interference signal suppression and cancellation means for in-band full duplex underwater acoustic communication are mainly divided into: local interference suppression is realized in the space dimension, and self-interference cancellation is performed by adopting a signal processing algorithm. However, due to limitations in structural design and signal processing technology, the current full duplex underwater acoustic communication technology still needs further exploration and breakthrough. It is worth mentioning that the self-interference signal suppression technology in the space dimension can reduce the local interference influence at the starting end of the strong interference signal, can avoid the expected signal from being submerged in the quantization noise, and can further remarkably improve the interference signal suppression capability of the underwater acoustic communication system after being combined with the signal processing algorithm, thereby realizing the high-performance in-band full duplex underwater acoustic communication technology. At present, a self-interference suppression and cancellation method in the space dimension for an in-band full duplex underwater acoustic communication system mainly comprises the following steps: the local interference signals are filtered and the desired signals are enhanced by using underwater acoustic transducers with directivity, by using isolation absorbing materials such as sound baffles, and by using beam forming techniques. However, it should be noted that the sound baffle in a full duplex underwater acoustic communication system generally requires a large size, while the use of a directional transducer requires a large radiation aperture, which results in a large size and heavy weight of the device, which makes practical use in an underwater environment difficult. The full duplex underwater acoustic communication technology based on the strong scattering underwater acoustic metamaterial is a new technical field, and research work in the aspect is not started at home and abroad at present. The strong scattering underwater acoustic metamaterial can be used as a manual design structure to realize flexible control of acoustic propagation characteristics, a full duplex underwater acoustic communication system based on the strong scattering underwater acoustic metamaterial is developed to provide a new thought for the field, the performance of suppressing and counteracting interference signals of the full duplex underwater acoustic communication system is hopefully improved, and a gate is opened for developing a novel full duplex underwater communication technology.
Disclosure of Invention
In view of the above, the present invention provides a duplex metamaterial underwater signal transmission system for sonar buoys, which is used for improving the high data transmission rate of underwater acoustic communication systems and communication networks. The invention adopts a class of underwater strong scattering underwater acoustic metamaterials to form the high-impedance isolation acoustic grating, which can realize an acoustic shadow area in the local near-field space of the underwater acoustic communication machine, and can realize effective inhibition of a strong interference signal (from a transmitting end of the communication machine) of the local receiving end by placing the signal receiving end of the underwater acoustic communication machine in the shadow area. Furthermore, the residual self-interference signal is counteracted by combining a local interference filtering algorithm, so that the communication performance of the in-band full-duplex underwater acoustic communication system is improved, and the system can be used for a communication scene with severely limited frequency band resources.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a duplex metamaterial underwater signal transmission system for sonar buoy, includes host computer, signal emission/collection module, power amplifier A, near-end emission transducer, strong scattering underwater sound metamaterial, receives hydrophone, low noise amplifier, far-end emission transducer and power amplifier B, and wherein host computer, signal emission/collection module, power amplifier A, near-end emission transducer and strong scattering underwater sound metamaterial connect gradually, receiving hydrophone, low noise amplifier and signal emission/collection module connect gradually, signal emission/collection module power amplifier B and far-end emission transducer connect gradually, strong scattering underwater sound metamaterial includes a set of even stereoplasm array board and a set of equidistant grid board, a set of even stereoplasm array board sets up perpendicularly in one side of equidistant grid board, strong scattering effect make and produce obvious district in near-end emission transducer near-field range, have the isolation effect to near-end strong interference signal, make self-interference signal intensity obviously reduce, and far-end signal received can further offset the full interference signal of the full-disturbance algorithm that can be combined with the weak signal of the full-interference of the received signal of this duplex communication in the near-field, can guarantee from this signal of the full-disturbance system to be taken advantage of the weak interference signal can be offset.
Further, the height of the equidistant grating plates is equal to the height H of the uniform hard array plate, and the thickness of the grating is equal to the thickness t of the uniform hard array plate 1 The size of the inter-grid air gap is equal to the size g of the array plate air gap.
Furthermore, the working frequency range of the strong scattering underwater sound metamaterial is a high-frequency high-speed communication frequency band: thickness t of 50-80kHz uniform hard array plate 1 3mm, 8mm width w, 100mm height H, 5mm array plate air gap size g, 13 uniform hard array plates, 5 equidistant grating plates, width t 2 7mm.
Further, the working frequency range of the strong scattering underwater sound metamaterial is 45-61kHz, and the thickness t of the hard array plate is uniform 1 4.5mm, a width w of 12mm, a height H of 130mm, a height g of an air gap of the array plate of 7.5mm, a plate number of the uniform hard array plate of 20, a grid number of equidistant grid plates of 9, a width t of the grid 2 9mm.
Further, the working frequency range of the strong scattering underwater sound metamaterial is 25-42kHz, and the thickness t of the hard array plate is uniform 1 8mm, 20mm width w, 250mm height H, 12mm height g of air gap of array plate, allThe number of the uniform hard array plates is 36, the number of the grids of the equidistant grid plate is 13, and the width t of the grids 2 13mm.
Further, the working frequency range of the strong scattering underwater sound metamaterial is 50-80kHz, and the thickness t of the hard array plate is uniform 1 3mm, 8mm width w, 100mm height H, 5mm height g of air gap between the array plates, 36 plates of uniform hard array plates, 5 grids of equidistant grid plates, and width t of the grids 2 7mm.
Furthermore, hydrophone arrays are placed in the shadow area generated by the strong scattering underwater acoustic metamaterial to receive signals, the number of the hydrophones is 3-9, and the space between the hydrophones is 5-10mm.
Furthermore, the strong scattering underwater sound metamaterial is made of metal.
Furthermore, the upper computer generates two sections of communication signals with the same frequency bands, each of which carries random information, wherein the communication signals adopt Orthogonal Frequency Division Multiplexing (OFDM) and Quadrature Phase Shift Keying (QPSK) subcarrier mapping modes and comprise a section of Linear Frequency Modulation (LFM) synchronous signals positioned at the front end of the data section for matched filtering.
Furthermore, the local interference filtering algorithm is to perform correlation processing on the linear frequency modulation synchronous signal of the self-interference end by using the signal collected by the receiving hydrophone through matched filtering so as to determine the synchronous and data signal position of the self-interference signal of the near end of the receiving signal. And then, carrying out local interference suppression cancellation according to the synchronous signal received by the self-interference terminal and the original transmitting signal, thereby obtaining a signal after self-interference signal cancellation. And finally, carrying out matched filtering on the far-end communication signals after cancellation, demodulating and decoding the signals, and canceling residual self-interference signals by adopting a local interference filtering algorithm.
Compared with the prior art, the duplex metamaterial underwater signal transmission system for the sonar buoy has the following beneficial effects:
(1) The strong scattering underwater acoustic metamaterial provided by the invention isolates strong self-interference signals in the space dimension, reduces the strength of the self-interference signals and avoids the remote expected signals from being submerged in quantization noise.
(2) The strong scattering underwater sound metamaterial provided by the invention has the advantages of compact structure, small volume, light weight and convenience in carrying and use, overcomes the defects of large scale and large mass of the traditional sound baffle, and is more suitable for practical application compared with the sound baffle.
(3) According to the duplex metamaterial underwater signal transmission system for the sonar buoy, the adopted local interference filtering algorithm can further offset residual self-interference signals after the strong scattering underwater sound metamaterial, and the underwater duplex communication capacity of the system can be remarkably improved.
(4) The duplex metamaterial underwater signal transmission system for the sonar buoy provided by the invention adopts a mode of combining metamaterial space inhibition and algorithm cancellation, so that the intensity of a near-end self-interference signal is effectively reduced, the inhibition capability of an in-band full-duplex underwater acoustic communication system on a strong self-interference signal is improved, the overall communication performance of the communication system is enhanced, and the duplex metamaterial underwater signal transmission system is expected to be applied to underwater communication application scenes with severely limited spectrum bandwidth.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a duplex metamaterial underwater signal transmission system for a sonar buoy;
FIG. 2 is a schematic structural diagram of a strongly scattering underwater acoustic metamaterial;
FIG. 3 is a schematic diagram of the working principle of the acoustic shadow area generated by the strongly scattering underwater acoustic metamaterial to realize local interference suppression;
FIG. 4 is a schematic diagram of a strong scattering underwater sound metamaterial composed of three groups of uniform hard array plates and one grid plate;
FIG. 5 is a graph showing the simulation and experimental comparison of the effect of strongly scattering underwater acoustic metamaterial on local interference suppression;
FIG. 6 is a schematic diagram of a principle for a local interference filtering algorithm;
FIG. 7 is a comparison of experimental results of the combination of only strongly scattering underwater acoustic metamaterial (having structure) and strongly scattering underwater acoustic metamaterial with local interference filtering cancellation algorithm to cancel the near-end self-interference signal without far-end transmit signal;
fig. 8 is a comparison of experimental results of in-band full duplex underwater acoustic communication, without cancellation means, with only strong scattering underwater acoustic metamaterial isolation, with only local interference filtering algorithm cancellation, and with strong scattering underwater acoustic metamaterial combined with local interference filtering algorithm cancellation.
The label specification in the drawings: 1-uniform hard array plate, 2-array plate air gap, 3-equidistant grating plate, 4-inter-grating air gap.
Detailed Description
The following detailed description of the invention is presented in conjunction with the accompanying drawings to provide those skilled in the art with a better understanding of the advantages and features of the invention, and to provide a clearer and more definite definition of the scope of the invention.
Implementation of the embodiments of the invention is not limited to the specific details familiar to those skilled in the art, and the exemplary embodiments may be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein.
Referring to fig. 1-8, the embodiment is described, a duplex metamaterial underwater signal transmission system for a sonar buoy comprises a host computer (PC), a signal transmitting/collecting module, a power amplifier a, a near-end transmitting transducer, a strong scattering underwater acoustic metamaterial, a receiving hydrophone, a low noise amplifier, a far-end transmitting transducer and a power amplifier B, wherein the host computer (PC), the signal transmitting/collecting module, the power amplifier a, the near-end transmitting transducer and the strong scattering underwater acoustic metamaterial are sequentially connected, the receiving hydrophone, the low noise amplifier and the signal transmitting/collecting module are sequentially connected, the signal transmitting/collecting module, the power amplifier B and the far-end transmitting transducer are sequentially connected, the strong scattering underwater acoustic metamaterial comprises a group of uniform hard array plates 1 and a piece of equidistant grating plates 3, the group of uniform hard array plates 1 are vertically arranged on one side of the equidistant grating plates 3, the strong scattering underwater acoustic metamaterial forms a high-impedance acoustic isolation structure, and the strong scattering effect of sound waves enables an ideal shadow area generated in a near-end transmitting range to have obvious effect on the near-end underwater acoustic interference of the near-end transducer. The strong scattering underwater acoustic metamaterial enables the intensity of near-field self-interference signals to be obviously reduced, and ensures that a receiving hydrophone can receive communication signals with weak far ends. The strong scattering underwater acoustic metamaterial is combined with a local interference filtering algorithm, so that interference signals can be further restrained and counteracted, the strong interference restraining capability of the in-band full duplex underwater acoustic communication system is obviously enhanced, and the underwater communication performance is improved.
The height of the equidistant grating plate 3 is equal to the height H of the uniform hard array plate 1, and the thickness of the grating is equal to the thickness t of the uniform hard array plate 1 1 The height of the inter-grid air gaps 4 is equal to the height g of the array plate air gaps 2.
The working frequency range of the strong scattering underwater sound metamaterial is 50-80kHz, and the frequency range meets the requirements of high-frequency high-speed underwater sound communication. Thickness t of uniform hard array plate 1 in metamaterial structure 1 3mm, 8mm width w, 100mm height H, 5mm height g of array plate air gap 3, 13 plates of uniform hard array plate 1, 5 grids of equidistant grid plate 3, width t of grid 2 7mm.
The working frequency range of the strong scattering underwater sound metamaterial is 45-61kHz, and the frequency range meets the requirements of medium-high frequency and high-speed underwater sound communication. Thickness t of uniform hard array plate 1 in metamaterial structure 1 4.5mm, 12mm width w, 130mm height H, 7.5mm height g of array plate air gap 2, 20 plates of uniform hard array plate 1, 9 grids of equidistant grid plate 3, width t of grid 2 9mm.
The working frequency range of the strong scattering underwater sound metamaterial is 25-42kHz, and the frequency range meets the requirements of medium-high frequency and high-speed underwater sound communication. Thickness t of uniform hard array plate 1 in metamaterial structure 1 8mm, 20mm width w, 250mm height H, 12mm height g of air gap 2 of array plate, 36 plates of uniform hard array plate 1, equidistant grid plate 3The number of grids is 13, the width t of the grids 2 13mm.
The working frequency range of the strong scattering underwater sound metamaterial is 50-80kHz, and the frequency band meets the requirements of high-frequency high-speed underwater sound communication. Thickness t of uniform hard array plate 1 in metamaterial structure 1 3mm, 8mm width w, 100mm height H, 5mm height g of array plate air gap 2, 36 plates of uniform hard array plate 1, 5 grids of equidistant grid plate 3, width t of grid 2 7mm.
The optimal design of the strong scattering underwater sound metamaterial adopts three groups of uniform hard array plates and a grid plate combination, and the interval t of the three groups of uniform hard array plates is 3-5mm. And receiving signals by adopting a receiving hydrophone array in an shadow area generated by the strong scattering underwater acoustic metamaterial, wherein the number of the hydrophones is 3-9, and the space between the hydrophones is 5-10mm.
Three groups of uniform hard array plates in the optimal design structure of the strong scattering underwater acoustic metamaterial have gaps t of 3-5mm, working frequency ranges of 50-80kHz, and thickness t of the uniform hard array plates 1 3mm, 8mm width w, 100mm height H, 5mm height g of air gap 2 of array plate, 13 uniform array plates, 5 grids on grid plate, and t width of grid plate 2 7mm, height equivalent array plate H, grid thickness equivalent array plate thickness t 1 The inter-grid air gap is equivalent to the array plate air gap g.
The strong scattering underwater sound metamaterial is made of metal, preferably steel.
The duplex metamaterial underwater signal transmission system for the sonar buoy is characterized in that an upper computer (PC) generates two sections of communication signals (with the same frequency bands) carrying random information respectively, the communication signals adopt an Orthogonal Frequency Division Multiplexing (OFDM) mode and Quadrature Phase Shift Keying (QPSK) subcarrier mapping, and the duplex metamaterial underwater signal transmission system comprises a section of Linear Frequency Modulation (LFM) synchronous signal positioned at the front end of a data section and used for matched filtering.
Further, the invention adopts a local interference filtering algorithm. In the signal processing method, a signal collected by a receiving hydrophone is subjected to matched filtering, and a Linear Frequency Modulation (LFM) synchronous signal of a self-interference end is subjected to correlation processing, so that the synchronization of a near-end self-interference signal and the position of a data signal in the received signal are determined. And then, carrying out local interference suppression cancellation according to the synchronous signal segment (expected) received by the self-interference terminal and the original transmitting signal (reference), and obtaining a signal after self-interference signal cancellation. And finally, carrying out matched filtering of the far-end communication signals on the counteracted signals, and finally, carrying out demodulation and decoding.
The invention aims to reduce the influence of a near-end strong self-interference signal on a far-end weak expected communication signal and improve the rejection and cancellation capability of an in-band full-duplex underwater acoustic communication system on the strong self-interference signal, so as to provide a duplex metamaterial underwater signal transmission system for a sonar buoy. The in-band full duplex underwater acoustic communication system adopts a method combining metamaterial space inhibition and algorithm cancellation to effectively inhibit and cancel self-interference signals, forms a strong acoustic shadow area by using strong scattering underwater acoustic metamaterials in the space dimension to inhibit the strong self-interference signals, further combines a local interference filtering algorithm with received signals to cancel residual self-interference signals, and the combined cancellation method has a greatly improved cancellation effect compared with the traditional method. The metamaterial has the important function of inhibiting the self-interference signal in the space dimension, so that the pressure of algorithm offset can be reduced, the expected signal is prevented from being submerged in quantization noise, and meanwhile, the self-interference signal inhibiting capability of the system is improved integrally. The in-band full duplex underwater acoustic communication system provides a new thought and technology for developing a high-speed underwater communication system, and has important research significance and application value in a communication scene with severely limited frequency spectrum resources.
As shown in fig. 1, the upper computer generates two sections of communication signals (the frequency bands are the same) each carrying random information, the communication signals adopt Orthogonal Frequency Division Multiplexing (OFDM) mode and Quadrature Phase Shift Keying (QPSK) subcarrier mapping, and the communication signals comprise a section of Linear Frequency Modulation (LFM) synchronous signals positioned at the front end of the data section for matched filtering. The analog output port of the signal transmitting/collecting module generates corresponding voltage signals, and the voltage signals are amplified by the power amplifiers A and B to drive the near-end transmitting transducer and the far-end transmitting transducer to transmit underwater sound communication signals. The far-end transmitting transducer transmits signals with a certain delay, so that the far-end transmitting transducer transmits signals and the near-end transmitting transducer transmit signals to be overlapped, thereby forming a background condition of near-end strong self-interference. A strong scattering underwater acoustic metamaterial is placed between the near-end transmitting transducer and the receiving hydrophone, so that strong self-interference signals are isolated and suppressed in the space dimension, and the strength of the self-interference signals can be weakened. The receiving hydrophone receives the residual self-interference signal of the strong scattering underwater acoustic metamaterial and the weak expected signal at the far end, and carries out correlation processing on a Linear Frequency Modulation (LFM) synchronous signal at the self-interference end through matched filtering to determine the synchronization of the self-interference signal at the near end and the position of a data signal in the receiving signal. Further, according to the synchronous signal segment (expected) received by the self-interference terminal and the original transmitting signal (reference), local interference filtering algorithm cancellation is carried out, and the signal after self-interference signal cancellation is obtained. And finally, carrying out matched filtering on the far-end communication signals on the counteracted signals, and further displaying communication information on an upper computer to complete in-band full duplex underwater acoustic communication.
As shown in FIG. 2, the strongly scattering underwater acoustic metamaterial used in the space dimension consists of a uniform equidistant hard array plate and a grid plate, wherein the thickness t of the uniform hard array plate 1 1 3mm, 8mm width w, 100mm height H, 5mm height g of array plate air gap 2, 13 uniform array plates, 5 grids on equidistant grid plate 3, width t 2 The height H of the uniform hard array plate 1 is 7mm, the grid thickness is equal to the thickness t of the uniform hard array plate 1 1 The height of the inter-grid air gaps 4 is equal to the height g of the array plate air gaps 2. The strong self-interference signal is isolated by the strong scattering underwater sound metamaterial shown in fig. 2 in the space dimension cancellation. The strong scattering underwater sound metamaterial can generate an obvious sound insulation shadow area in the range of a working frequency band.
As shown in fig. 3, the strong scattering underwater acoustic metamaterial forms a high-impedance acoustic isolator, and has obvious sound insulation effect in the working frequency range due to the strong scattering effect, so that an acoustic shadow area is formed, the suppression degree of local interference signals in the shadow area is strongest, and hydrophones are arranged in the shadow area, so that the suppression and cancellation of near-end self-interference signals are performed. The single receiving hydrophone or the receiving hydrophone array is arranged in the shadow area, so that good near-end self-interference signal isolation and suppression effects can be obtained. The isolation of the near-end self-interference signal can be completed by utilizing the small-area shadow area, which is beneficial to the miniaturization, the simplified processing and the cost saving of the structure.
As shown in fig. 4, the combined high-impedance isolation acoustic grating metamaterial is formed by adopting three groups of uniform hard array plates and one grating plate, so that the area of a shadow area can be increased, the hydrophone array receiving signals can be conveniently distributed and received, the number of the uniform hard array plates and the degree of the grating plate can be increased under the condition that the using space is not limited, and the scope of the shadow area can be widened.
As shown in FIG. 5, the experimental and simulation comparison chart of the sound wave isolation effect of the strong scattering underwater sound metamaterial in the range of 50-100kHz is shown. Simulation results show that the sound insulation effect of the metamaterial is greater than 40dB in the frequency band of 69-76kHz, and the maximum sound insulation effect can reach-45 dB at 69 kHz. Further developing the metamaterial underwater test, completing the test of the sound insulation performance of the strong scattering underwater sound metamaterial in the sound-damping pool, and collecting the sound insulation receiving signal amplitude V of the metamaterial by emitting a frequency sweeping signal of 50-100kHz 1 And received signal amplitude V without metamaterial 2 Calculate 20 log (V 1 /V 2 ) And judging the sound insulation performance, so that the inhibition effect of the metamaterial on the local interference signal can be evaluated. It is worth mentioning that the sound insulation frequency band of the test result is slightly deviated from the simulation result, but the overall trend shows better sound insulation and interference suppression effects.
As shown in fig. 6, the received signal is subjected to a local interference filtering algorithm after passing through the strongly scattering underwater acoustic metamaterial. It should be noted that, the local interference filtering algorithm uses the tap coefficient at the previous moment to solve the tap coefficient at the moment, and the specific implementation steps are as follows:
(1) When the algorithm is initialized and the starting time n=0, the initial value of the tap coefficient is set as w= [0 … 0] T Initializing an autocorrelation inverse matrix P (0) =c -1 I, c are constants.
(2) Loop iteration, when iteration time n=1,2,3, …, n+1, the gain vector K (n) is calculated and the autocorrelation inverse matrix P (n) is updated. K (n) =p (n-1) x (n)/[ λ+x H (n)P(n-1)x(n)]，P(N)＝[P(n-1)-K(n) x H (n)P(n-1)]λ -1 。
(3) Calculating an estimation error e (n): e (n) =d (n) -w H (n-1)x(n)。
(4) Updating weight coefficient w (n) of the tap: w (n) =w (n-1) +k (n) e (n).
As shown in FIG. 7, when there is no far-end transmitting signal, the receiving signal S of the metamaterial is collected 1 Receiving signal S isolated by strong scattering underwater acoustic metamaterial only 2 Received signal S which is jointly counteracted by combining strong scattering underwater sound metamaterial with local interference counteraction algorithm 3 . The invention calculates the strength of the capability of counteracting the self-interference signal mainly through the energy ratio: strong scattering underwater acoustic metamaterial cancellation capability:cancellation capability of the strong scattering metamaterial combined with a local interference filtering algorithm: />The cancellation capability of the strong scattering underwater acoustic metamaterial on the near-end self-interference signal can reach 20.41dB, and the cancellation capability of the metamaterial combination algorithm can reach 47.49dB.
As shown in FIG. 8, an in-band full duplex underwater acoustic communication test is further carried out, and the experimental result shows that when no strong scattering underwater acoustic metamaterial is only used for resisting a local interference filtering algorithm, the bit error rate of a communication system is 23.7381%. In contrast, the method of combining the strong scattering underwater sound metamaterial with the algorithm can remarkably reduce the bit error rate of a communication system to 2.4286%. Compared with the method for canceling the strong scattering underwater acoustic metamaterial combined algorithm and the method for canceling the local interference filtering algorithm only, the bit error rate of the communication system is greatly reduced, which proves that the strong scattering underwater acoustic metamaterial combined interference filtering algorithm is very effective for suppressing the near-end self-interference signal.
The embodiments of the invention disclosed above are intended only to help illustrate the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention.
Claims (10)
1. A duplex metamaterial underwater signal transmission system for sonar buoy, its characterized in that: comprises an upper computer, a signal transmitting/collecting module, a power amplifier A, a near-end transmitting transducer, a strong scattering underwater sound metamaterial, a receiving hydrophone, a low noise amplifier, a far-end transmitting transducer and a power amplifier B, wherein the upper computer, the signal transmitting/collecting module, the power amplifier A, the near-end transmitting transducer and the strong scattering underwater sound metamaterial are sequentially connected, the receiving hydrophone, the low noise amplifier and the signal transmitting/collecting module are sequentially connected, the signal transmitting/collecting module power amplifier B and the far-end transmitting transducer are sequentially connected, the strong scattering underwater sound metamaterial comprises a group of uniform hard array plates (1) and a piece of equidistant grating plates (3), the group of uniform hard array plates (1) are vertically arranged on one side of the equidistant grating plates (3), the strong scattering underwater sound metamaterial has the function of generating an acoustic shadow area in a near field, and has the effects of inhibiting and isolating near-end strong self-interference signals.
2. The duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 1, wherein: thickness t of uniform hard array plate (1) 1 2-8mm, 8-20mm width w, 100-250mm height H, 5-12mm height g of air gap (2) of array plate, 13-36 plates of uniform hard array plate (1), 5-13 grids of equidistant grating plate (3) and width t of grating plate 2 The height of the equidistant grating plate (3) is equal to the height H of the uniform hard array plate (1) and the thickness of the grating is equal to the thickness t of the uniform hard array plate (1) with the thickness of 7-13mm 1 An inter-grid air gap (4)The height is equal to the height g of the air gap (2) of the array plate.
3. A duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 2, wherein: the working frequency range of the underwater acoustic metamaterial is 50-80kHz, so that the requirement of underwater high-frequency high-speed communication is met; thickness t of uniform hard array plate (1) 1 3mm, 8mm width w, 100mm height H, 5mm height g of the array plate air gap (2), 13 plates of the uniform hard array plate (1), 5 grids of the equidistant grid plate (3), width t of the grid 2 7mm.
4. A duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 2, wherein: the working frequency range of the strong scattering underwater sound metamaterial is 45-61kHz, and the requirements of underwater medium-high frequency and high-speed communication are met. Wherein the thickness t of the uniform hard array plate (1) in the metamaterial 1 4.5mm, 12mm width w, 130mm height H, 7.5mm height g of array plate air gap (2), 20 plates of uniform hard array plate (1), 9 grids of equidistant grid plate (3), width t of grid 2 9mm.
5. A duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 2, wherein: the working frequency range of the strong scattering underwater sound metamaterial is 25-42kHz, and the thickness t of the hard array plate (1) is uniform when the requirements of underwater medium-high frequency high-speed communication are met 1 8mm, 20mm width w, 250mm height H, 12mm height g of the array plate air gap (2), 36 plates of the uniform hard array plate (1), 13 grids of the equidistant grid plate (3), width t of the grids 2 13mm.
6. A duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 2, wherein: the working frequency range of the strong scattering underwater sound metamaterial is 50-80kHz, and the thickness t of the hard array plate (1) is uniform 1 3mm, 8mm width w, 100mm height H, 5mm height g of the array plate air gap (2), 36 plates of the uniform hard array plate (1), 5 grids of the equidistant grid plate (3), width t of the grids 2 7mm.
7. The duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 1, wherein: and receiving signals by adopting a hydrophone array in an shadow area generated by the underwater acoustic metamaterial, wherein the number of the hydrophones is 3-9, and the space between the hydrophones is 5-10mm.
8. The duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 1, wherein: the strong scattering underwater sound metamaterial is made of metal.
9. The duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 1, wherein: the upper computer generates two sections of communication signals with the same frequency bands, each of which carries random information, the communication signals adopt orthogonal frequency division multiplexing and orthogonal phase shift keying subcarrier mapping, and the communication signals comprise a section of linear frequency modulation synchronous signals positioned at the front end of the data section and are used for matched filtering.
10. The duplex metamaterial underwater signal transmission system for a sonar buoy according to claim 1, wherein: the method comprises the steps of further using a filtering algorithm to offset a self-interference signal, wherein the filtering algorithm is to perform correlation processing on a linear frequency modulation synchronous signal of a self-interference end by using a signal acquired by a receiving hydrophone firstly so as to determine the synchronization and the data signal position of a near-end self-interference signal in the received signal; and then, carrying out local interference suppression and cancellation according to the synchronous signal segment received by the self-interference terminal and the original transmitting signal to obtain a self-interference signal cancelled signal, and finally, carrying out matched filtering of a far-end communication signal on the cancelled signal, carrying out demodulation and decoding, and using a local interference filtering algorithm to cancel the residual self-interference signal.
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