CN114614896A - Underwater machine fixed platform photoacoustic efficiency enhanced bidirectional communication method - Google Patents
Underwater machine fixed platform photoacoustic efficiency enhanced bidirectional communication method Download PDFInfo
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- CN114614896A CN114614896A CN202011443383.1A CN202011443383A CN114614896A CN 114614896 A CN114614896 A CN 114614896A CN 202011443383 A CN202011443383 A CN 202011443383A CN 114614896 A CN114614896 A CN 114614896A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
- G10K11/006—Transducer mounting in underwater equipment, e.g. sonobuoys
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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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Abstract
The invention discloses a photoacoustic efficiency enhanced two-way communication method for an underwater mobile platform, which integrates a laser acoustic communication module, an underwater acoustic communication module and a hydrophone/array module in a tight coupling function and improves the effectiveness and the maneuverability of a two-way communication system between the underwater mobile platforms by means of double-carrier homologous information cascade transmission, photoacoustic carrier intermodulation, mutual verification and the like. The invention closely combines the advantages of long underwater transmission distance, random access, flexible and controllable endogenous attributes of an underwater acoustic communication system and small volume, light weight and simple and easy communication operation of laser sounding and laser sounding equipment; the operability and the maneuverability of a long-distance underwater acoustic communication system are enhanced through information transmission and reception of light-induced sound and sound-to-electricity, the communication reliability is improved through mutual verification of double physical field information, and a brand new solution is provided for realizing the efficiency enhanced two-way communication of an underwater mechanical-solid platform.
Description
Technical Field
The invention belongs to the subject fields of underwater acoustic communication, laser-induced acoustic communication, towed sonar array and the like, particularly relates to a wireless communication method for realizing bidirectional information transmission through laser-induced acoustic carriers between underwater fixed platforms to improve system efficiency, and particularly relates to a method, a system and a storage medium for enhancing the bidirectional communication of the photoacoustic efficiency of the underwater fixed platforms.
Background
The underwater machine fixed platform bidirectional wireless communication is an important component of underwater communication. When the underwater maneuvering platform needs to work underwater for a long time, generally, a underwater fixed guarantee center is required to be built, namely, a guarantee center (underwater fixed platform) is built underwater and is communicated with the underwater maneuvering platform to provide related guarantees for the underwater maneuvering platform. The underwater fixed platform can provide important data synchronization, historical data backup, data calculation and analysis, command rapid transmission, fault analysis, underwater command and other functions for the underwater mobile platform, so that a large amount of data communication requirements are generated among the underwater mobile platform and the underwater fixed platform. However, up to now, there is no good underwater vehicle-fixed platform two-way wireless communication means.
Acoustic communication is the only effective and mature means of underwater remote wireless information transmission. The sound wave is a main carrier of information in water and is widely applied to the fields of underwater communication, sensing, detection, navigation, positioning and the like. The sound wave belongs to mechanical waves, the signal attenuation of underwater transmission is reduced, the transmission distance is long, the application range can be extended from hundreds of meters to dozens of kilometers, and the underwater communication device is suitable for deep water communication with stable temperature. Heretofore, underwater acoustic communication is still the only effective and mature important means for cooperative communication of various underwater maneuvering platforms. However, waves, fish, ships, etc. in the ocean generate noise, which greatly disturbs the sound field in the ocean, and the received signals are blurred due to the difficulty that "multipath interference signals" are generated when the sound waves are transmitted in the sea. In order to effectively solve the influence caused by multipath propagation, the following two strategies are generally adopted: the signals are specially designed and processed to suppress multipath interference, and the other type is to use a well-directed transmitter and receiver array, i.e., a towed sonar. In order to ensure the reliability of underwater ultra-long-distance sonar communication, an array-type large towed support sonar (or a ship shell sonar) is generally adopted to transmit a communication signal, a towed linear array sonar receives a signal transmitted by the other communication sonar, and the towed linear array sonar and the towed support sonar cooperate to improve the reliability of the system. However, when a stable underwater acoustic transmission channel needs to be established between the underwater mechanical and fixed platforms, besides the requirement of installing and launching two sets of towed sonar arrays, strict requirements are also provided for the array type, the deployment depth and the orientation performance of the towed sonar arrays, and the application range of underwater acoustic communication is limited by the characteristic.
On the other hand, with the continuous development of high-power laser technology, the radiation sound production of the light source draws people's attention. Compared with the existing common underwater sound source, the laser sound source has remote control (the system does not need to wet the end), can randomly change the size and the shape of the light sound source and change the sound production frequency band, and can ensure that the sound source moves at any speed (subsonic speed, transonic speed or supersonic speed) in a sound transmission medium without causing the streaming of the traditional sound source. The sound source level approximation of the sound pulse excited by the laser on the water surface is in direct proportion to the energy density of the laser, the peak value of the sound pulse received in the direction vertical to the propagation direction of the laser is the largest, the width of the sound pulse is the smallest, and the peak value of the sound pulse received in the propagation direction of the laser is the smallest, and the width of the sound pulse is the largest.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a photoacoustic efficiency enhanced two-way communication method for an underwater machine fixed platform.
In order to achieve the effect, the underwater machine fixed platform photoacoustic efficiency enhanced two-way communication method provided by the invention realizes point-to-point two-way communication by an underwater fixed platform and a plurality of underwater mobile platforms, two communication sides respectively comprise a laser information transmitting channel, a laser acoustic communication module and a hydrophone/array receiving module, the laser signal transmitting module modulates the laser acoustic communication module, the laser acoustic communication module transmits laser carrier waves to excite a water body to generate acoustic signals, the hydrophone/array module receives the acoustic signals to establish a two-way communication link between the underwater platforms, converts information to be transmitted into electric signals and excites the laser light source to transmit laser carrier waves, the laser acoustic communication module transmits signal beams to excite the water body to generate sonar carrier signals, and the hydrophone/array receiving module receives the underwater acoustic signals and converts the underwater acoustic signals into electric signals, and completing the bidirectional information transmission between the underwater mobile platform and the underwater fixed platform.
Preferably, the method specifically comprises:
s101, initiating a communication request by an underwater fixed platform as required, and establishing an underwater acoustic communication link based on laser induced sound;
s102, searching and tracking corresponding underwater acoustic signals by the underwater mobile platform according to needs;
s103, the two communication parties complete the information reception by demodulating and decoding the received signals, and select whether to answer the signals of the other party according to specific conditions to complete the establishment and maintenance of the bidirectional communication link;
s104, for the sound source signal of laser induced sound, aiming at the channel characteristics, changing the repetition frequency, the pulse width and other parameters of an excitation light source to obtain sound source signals with different wavelengths and different frequencies, and effectively inhibiting multipath interference;
and S105, for the two-way communication mode, when the information transmission is different, a retransmission request and error correction negotiation are carried out.
Preferably, in the above method, the first stage of the information transmission carrier for laser-induced acoustic communication is laser, the laser is incident on the water surface and breaks down the water surface to form sonar signals, and at this time, the second stage of the information transmission carrier is sonar.
Preferably, the underwater acoustic communication module completes connection of the photoacoustic combined communication link by transmitting and receiving sonar signals.
Preferably, the hydrophone/array module realizes mutual connection of the received underwater acoustic mechanical vibration through a physical effect, completes conversion from kinetic energy to electric energy, and finally completes information reception.
Preferably, the method realizes point-to-point bidirectional communication of the underwater fixed platform to the single underwater mobile platform, the underwater fixed platform is used as a communication initiator, and a photoacoustic cascade communication link between the underwater fixed platform and the single underwater mobile platform is established.
Preferably, the method realizes point-to-multipoint broadcast communication of the underwater fixed platform to the plurality of underwater mobile platforms, the underwater fixed platform is used as a communication initiator, a broadcast type information transmission mode is adopted to initiate communication and establish a laser sound level communication link, and other underwater mobile platforms receive and demodulate acoustic signals according to needs and select whether to respond or not according to actual conditions.
Preferably, the method realizes the multi-access communication of the underwater mobile platform, and the underwater mobile platform is used as an access point to establish a laser sound level communication link and support the multi-access of a plurality of underwater platforms in different modes for meeting the requirements of underwater wireless communication networking.
A system for realizing the underwater machine fixed platform photoacoustic efficiency enhanced two-way communication method comprises
An information laser emission array channel, an encoder, a modem, a decoder, a laser induced acoustic communication module and an underwater acoustic towed array receiving channel,
the information laser emission array channel is used for transmitting information to be transmitted to the encoder;
the encoder converts the information into a digital baseband signal and transmits the digital baseband signal to the modem;
the modulator-demodulator is used for modulating the baseband signal and outputting a band-pass signal, demodulating the received band-pass signal and outputting the baseband signal, and meanwhile, the modulator-demodulator is used for sending synchronous clock pulses by the laser emission array channel, the underwater sound receiving channel and the laser induced sound communication module;
the laser array transmitting channel is used for transmitting the band-pass signal output by the modem to the laser acoustic communication module;
the laser acoustic communication module is used for exciting the band-pass signal output by the information laser emission array channel to a laser emission array consisting of a plurality of laser sources to generate a high-energy laser pulse signal, and the laser pulse signal acts on a water body to form a rapidly-expanded plasma cavity so as to excite a surrounding medium to form sound waves;
the underwater acoustic towed array receiving channel is used for converting the received underwater acoustic signals into band-pass electric signals through the hydrophone/array module and then sequentially outputting the band-pass electric signals to the modem and the decoder, so that the whole underwater acoustic communication process is completed, and a stable opto-acoustic cascade bidirectional communication link between underwater mechanical fixed platforms is established.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the above-described method.
Compared with the prior art, the invention closely combines the advantages of long transmission distance of sonar communication water medium, random access, flexible and controllable endogenous attributes, small volume of a laser sound-induced terminal, light weight, no need of the system for sounding when entering water, easy deployment, flexibility and the like; the application range of underwater acoustic communication is expanded through the information transmission mode of laser induced sound and optical fiber underwater listening, the efficiency of a communication system is improved through mutual verification of information of double optical and acoustic physical fields, and a brand new solution is provided for enhancing the two-way communication efficiency between underwater machine fixed platforms.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating the working principle of photoacoustic efficiency enhanced two-way communication of a shore-based fixed platform-underwater mobile platform according to the present invention;
fig. 2 shows a typical application mode schematic diagram of the underwater mobile platform photoacoustic interconnection bidirectional communication.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides an embodiment of a bidirectional communication method for enhancing photoacoustic efficiency of an underwater machine fixed platform, which is characterized in that point-to-point bidirectional communication is realized by the underwater fixed platform and a plurality of underwater mobile platforms, two communication sides respectively comprise a laser information transmitting channel, a laser acoustic communication module and a hydrophone/array receiving module, the laser signal transmitting module modulates the laser acoustic communication module, the laser acoustic communication module transmits laser carrier waves to excite a water body to generate acoustic signals, the hydrophone/array module receives the acoustic signals to establish a bidirectional communication link between the underwater platforms, converts information to be transmitted into electric signals and excites the laser light source to transmit the laser carrier waves, the laser acoustic communication module transmits signal beams to excite the water body to generate sonar carrier signals, and the hydrophone/array receiving module receives the underwater acoustic signals and converts the underwater acoustic signals into the electric signals, and completing the bidirectional information transmission between the underwater mobile platform and the underwater fixed platform.
In some embodiments, the method specifically comprises:
s101, initiating a communication request by an underwater fixed platform as required, and establishing an underwater acoustic communication link based on laser induced sound;
s102, searching and tracking corresponding underwater acoustic signals by the underwater mobile platform according to needs;
s103, the two communication parties complete the information reception by demodulating and decoding the received signals, and select whether to answer the signals of the other party according to specific conditions to complete the establishment and maintenance of the bidirectional communication link;
s104, for the sound source signal of laser induced sound, aiming at the channel characteristics, changing the repetition frequency, the pulse width and other parameters of an excitation light source to obtain sound source signals with different wavelengths and different frequencies, and effectively inhibiting multipath interference;
and S105, for the two-way communication mode, when the information transmission is different, a retransmission request and error correction negotiation are carried out.
In some embodiments, the first stage of the information transmission carrier of laser induced acoustic communication is laser, and the laser is incident on the water surface and breaks down the water surface to form sonar signals, and the second stage of the information transmission carrier is sonar.
In some embodiments, the underwater acoustic communication module completes the connection of the photoacoustic combined communication link by transmitting and receiving sonar signals.
In some embodiments, the hydrophone/array module interconnects the received mechanical vibration of underwater acoustics through a physical effect, completes conversion from kinetic energy to electric energy, and finally completes reception of information.
In some embodiments, point-to-point bidirectional communication of the underwater fixed platform to the single underwater mobile platform is realized, the underwater fixed platform serves as a communication initiator, and a photoacoustic cascade communication link with the single underwater mobile platform is established.
In some embodiments, point-to-multipoint broadcast communication of an underwater fixed platform to a plurality of underwater mobile platforms is achieved, the underwater fixed platform serves as a communication initiator, a broadcast type information transmission mode is adopted to initiate communication and establish a laser sound level communication link, and other underwater mobile platforms receive and demodulate acoustic signals as required and select whether to respond or not according to actual conditions.
In some embodiments, the underwater mobile platform multiple access communication is realized, underwater wireless communication networking requirements are met, an underwater fixed platform is used as an access point, a laser sound level communication link is established, and multiple access of multiple underwater platforms in different modes is supported.
The invention provides a system for enhancing the photoacoustic efficiency of an underwater machine-fixed platform and a bidirectional communication method, which comprises the following steps:
an information laser emission array channel, an encoder, a modem, a decoder, a laser induced acoustic communication module and an underwater acoustic towed array receiving channel,
the information laser emission array channel is used for transmitting information to be transmitted to the encoder;
the encoder converts the information into a digital baseband signal and transmits the digital baseband signal to the modem;
the modulator-demodulator is used for modulating the baseband signal and outputting a band-pass signal, demodulating the received band-pass signal and outputting the baseband signal, and meanwhile, the modulator-demodulator is used for sending synchronous clock pulses by the laser emission array channel, the underwater sound receiving channel and the laser induced sound communication module;
the laser array transmitting channel is used for transmitting the band-pass signal output by the modem to the laser acoustic communication module;
the laser acoustic communication module is used for exciting the band-pass signal output by the information laser emission array channel to a laser emission array consisting of a plurality of laser sources to generate a high-energy laser pulse signal, and the laser pulse signal acts on a water body to form a rapidly-expanded plasma cavity so as to excite a surrounding medium to form sound waves;
the underwater acoustic towed array receiving channel is used for converting the received underwater acoustic signals into band-pass electric signals through the hydrophone/array and then sequentially outputting the band-pass electric signals to the modem and the decoder, so that the whole underwater acoustic communication process is completed, and a stable opto-acoustic cascade bidirectional communication link between underwater mechanical fixed platforms is established.
The invention provides an embodiment of a photoacoustic efficiency enhanced two-way communication method for an underwater machine-fixed platform, which integrates a tight coupling function of an information laser emission array channel, a laser acoustic communication module and an underwater acoustic towed array receiving channel; the information laser emission array channel is used for transmitting information to be transmitted to the encoder, and the encoder converts the information into a digital baseband signal and transmits the digital baseband signal to the modem; the modulator-demodulator is used for modulating the baseband signal and outputting a band-pass signal, demodulating the received band-pass signal and outputting the baseband signal, and simultaneously sending synchronous clock pulses by the laser emission array channel, the underwater sound receiving channel and the laser acoustic communication module; the laser array transmitting channel is used for transmitting the band-pass signal output by the modem to the laser-induced acoustic communication module; and the laser acoustic communication module is used for exciting the band-pass signal output by the transmitting channel to a laser transmitting array consisting of a plurality of laser sources to generate a high-energy laser pulse signal, and the laser pulse signal acts on a water body to form a rapidly-expanded plasma cavity so as to excite a surrounding medium to form sound waves. And the underwater acoustic towed array receiving channel is used for converting the received underwater acoustic signals into band-pass electric signals through the hydrophone/array and then sequentially outputting the band-pass electric signals to the modem and the decoder, so that the whole underwater acoustic communication process is completed, and a stable opto-acoustic cascade bidirectional communication link between the underwater mechanical fixed platforms is established. In the communication process, the two-way communication efficiency between the underwater machine fixed platforms is enhanced by means of photoacoustic double-carrier homologous information cascade transmission, photoacoustic carrier mutual check and the like.
The invention provides an embodiment of a photoacoustic efficiency enhanced two-way communication method for an underwater machine-fixed platform, which comprises the following steps:
step one, establishing an information transmitting channel, namely converting information to be transmitted into an electric signal by a system transmitting end, and exciting a laser light source to transmit laser carriers;
step two, the laser acoustic communication module emits signal beams to excite a water body to generate sonar carrier signals;
and step three, establishing a hydrophone/array receiving channel, namely, receiving the underwater acoustic signals and converting the underwater acoustic signals into electric signals to finish the bidirectional information transmission between the underwater machine fixed platforms.
As shown in fig. 1, the present invention provides an embodiment of bidirectional communication between underwater machine and fixed platforms with enhanced photoacoustic performance, where two communication parties respectively include a laser information transmitting channel, a laser acoustic communication module, and a hydrophone/array receiving module. The laser signal transmitting module modulates the laser acoustic communication module, the laser acoustic communication module transmits laser carriers to excite a water body to generate acoustic signals, and the hydrophone/array module receives the acoustic signals to establish a bidirectional communication link between the underwater platforms.
In some embodiments, the present invention includes, but is not limited to, three exemplary modes of operation:
1. point-to-point bidirectional communication mode of underwater fixed platform to single underwater mobile platform: the underwater fixed platform is used as a communication initiator to establish a photoacoustic cascade communication link with a single underwater mobile platform. The two communication parties can keep a reliable laser sound level connected with the two-way communication link for a long time as required, the problems that a traditional boat-mounted underwater sound emission terminal dragged sonar is large in size, dragged array is difficult to retract and release, and the array is difficult to keep are solved through laser induced sound communication and underwater listening receiving, and the efficiency of the two-way communication system between the underwater mechanical fixed platforms is improved.
2. Point-to-multipoint broadcast communication mode of underwater fixed platform to multiple underwater mobile platforms: the underwater fixed platform is used as a communication initiator, a broadcast type information transmission mode is adopted to initiate communication and establish a laser sound level communication link, other underwater mobile platforms receive and demodulate acoustic signals according to needs and select whether to respond or not according to actual conditions, the effectiveness, reliability and concealment of information transmission are improved by means of a point-to-multipoint broadcast type information transmission mechanism, and the position information of the underwater platform is guaranteed not to be intercepted.
3. The underwater maneuvering platform multiple access communication mode is as follows: the underwater wireless communication networking demand is met, an underwater fixed platform is used as an access point, a laser sound level communication link is established, multiple access of multiple underwater platforms in different modes is supported, information sharing of multiple underwater mobile platforms is achieved, and high freedom and network flexibility are achieved.
The invention aims at the problem of short board of the underwater acoustic communication system in the specific application scene at the present stage, and provides a brand new thought for the wireless two-way communication system between the underwater machine fixed platforms with high maneuverability and enhanced efficiency. Fig. 2 shows a typical application mode of photoacoustic cascade two-way communication of an underwater mobile platform, wherein a represents an underwater fixed platform photoacoustic array, B represents underwater distributed fixed optical fiber hydrophone array nodes, C and D represent laser-induced acoustic emission terminals on different underwater mobile platforms, E and F represent optical fiber hydrophone towed sonars on different underwater mobile platforms, a curve represents an underwater acoustic link, and electric waves represent a laser-induced acoustic link.
The invention provides an embodiment of a photoacoustic efficiency enhanced two-way communication method for an underwater machine-fixed platform, which comprises the following steps:
s1, initiating a communication request by the underwater fixed platform according to needs, and establishing an underwater acoustic communication link based on laser induced sound;
s2, searching and tracking corresponding underwater acoustic signals by the underwater maneuvering platform according to needs;
s3, the two parties of communication finish the information receiving by demodulating and decoding the received signal, and select whether to answer the other party signal according to the specific situation, thereby finishing the establishment and maintenance of the bidirectional communication link.
S4, for the sound source signal of laser induced sound, the parameters of repetition frequency, pulse width, etc. of the excitation light source can be changed according to the channel characteristics to obtain the sound source signal with different wavelengths and different frequencies, thereby effectively inhibiting the multipath interference.
And S5, for the bidirectional communication mode, when the information transmission is different, steps such as retransmission request, negotiation error correction and the like can be executed, and the reliability and the stability of the bidirectional communication system are ensured.
The invention provides an embodiment of an opto-acoustic interconnection efficiency enhanced bidirectional communication method among underwater machine fixed platforms, which integrates the tight coupling function of a laser acoustic communication module, an underwater acoustic communication module and a hydrophone/array module, and improves the maneuverability, reliability and safety of a bidirectional communication system among the underwater machine fixed platforms by means of double-carrier homologous information cascade transmission, opto-acoustic carrier intermodulation, mutual verification and the like.
In some embodiments, the first stage of the information transmission carrier in laser induced acoustic communication is laser, the laser is incident to the water body and breaks down the water body to form sonar signals, and the second stage of the information transmission carrier is sonar, and the typical system structure includes, but is not limited to, a laser, a signal source, a modulator, a frequency converter, an amplifier, an optical antenna, an optical lens, a mixer, a demodulator, a filter, and the like.
In some embodiments, the information transmission carrier in the underwater acoustic communication module is sonar, the underwater acoustic communication module completes the connection of the photoacoustic joint communication link by transmitting and receiving sonar signals, and typical system structures include, but are not limited to, transducers, hydrophones, modulators, signal sources, filters, amplifiers, demodulators, fiber sensor systems, etc., without limitation of specific operating wavelengths, communication protocols, industry standards, and application platforms;
in some embodiments, the hydrophone receiving array correlates the received mechanical vibrations of the underwater acoustics through some physical effect to complete the conversion of kinetic energy to electrical energy, and ultimately complete the reception of information. Typical system configurations include, but are not limited to, fiber optic hydrophones, piezoelectric hydrophones, acoustic pressure hydrophones, magnetostrictive hydrophones, couplers, sensing arms, reference arms, filters, amplifiers, sensor systems, and the like, without limitation of specific operating wavelengths, without limitation of structural types, without limitation of industry standards, without limitation of application platforms.
Compared with the prior art, the invention has the following advantages:
firstly, the invention provides a technical idea of realizing bidirectional wireless communication between underwater mechanical and fixed platforms by laser breakdown water body sound-making and hydrophone sound-measuring, and gives consideration to the characteristics of long underwater transmission distance, random access, flexible and controllable endogenous attributes of an underwater sound communication system and small volume, light weight and simple and easy communication operation of laser sound-making equipment;
secondly, the working modes of point-to-point bidirectional communication, point-to-multipoint broadcast communication and point-to-multipoint wireless multiple access communication provided by the invention can keep certain communication capacity under special conditions of ultra-long distance, non-line-of-sight tracking, multi-user access and the like, and lays a solid foundation for the application of large-range wireless networking communication of the underwater fixed platform which is flexible and mobile;
in addition, the underwater mobile platform photoacoustic interconnection communication method can be compatible with the existing underwater acoustic communication module, can be directly interconnected with the existing underwater wireless sonar system, and can provide important support for smooth upgrading of future underwater wireless networks.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A bidirectional communication method for enhancing photoacoustic efficiency of underwater machine-fixed platforms is characterized in that point-to-point bidirectional communication is realized by the underwater fixed platforms and a plurality of underwater mobile platforms, two communication parties respectively comprise a laser information transmitting channel, a laser acoustic communication module and a hydrophone/array receiving module, the laser acoustic communication module modulates the laser acoustic communication module, the laser acoustic communication module transmits laser carriers to excite a water body to generate acoustic signals, the hydrophone/array module receives the acoustic signals to establish a bidirectional communication link between the underwater platforms and converts information to be transmitted into electric signals, and the laser light source is excited to emit laser carrier waves, the laser acoustic communication module emits signal light beams to excite the water body to generate sonar carrier wave signals, and the hydrophone/array receiving module receives the underwater acoustic signals and converts the underwater acoustic signals into electric signals to complete bidirectional information transmission between the underwater mobile platform and the underwater fixed platform.
2. The underwater airborne platform photoacoustic effectiveness enhancing bidirectional communication method of claim 1, wherein the method specifically comprises:
s101, initiating a communication request by an underwater fixed platform as required, and establishing an underwater acoustic communication link based on laser induced sound;
s102, searching and tracking corresponding underwater acoustic signals by the underwater mobile platform according to needs;
s103, the two communication parties complete the information reception by demodulating and decoding the received signals, and select whether to answer the signals of the other party according to specific conditions to complete the establishment and maintenance of the bidirectional communication link;
s104, for the sound source signal of laser induced sound, aiming at the channel characteristics, changing the repetition frequency, the pulse width and other parameters of an excitation light source to obtain sound source signals with different wavelengths and different frequencies, and effectively inhibiting multipath interference;
and S105, for the two-way communication mode, when the information transmission is different, a retransmission request is executed, and error correction is negotiated.
3. The underwater mechanical-fixed platform photoacoustic efficiency enhancement two-way communication method according to claim 1, wherein in the method, the first stage of the information transmission carrier of laser induced acoustic communication is laser, the laser is incident to the water surface and breaks down the water surface to form sonar signals, and at the moment, the second stage of the information transmission carrier is sonar.
4. The underwater mechanical-fixed platform photoacoustic effectiveness enhancement two-way communication method according to claim 3, wherein the underwater acoustic communication module completes the connection of the photoacoustic combined communication link by transmitting and receiving sonar signals.
5. The underwater airborne platform photoacoustic effectiveness-enhanced two-way communication method according to claim 1, wherein the hydrophone/array module is used for mutually connecting the received mechanical vibration of underwater acoustics through a physical effect, completing the conversion from kinetic energy to electric energy, and finally completing the reception of information.
6. The underwater mechanical fixed platform photoacoustic effectiveness enhancement two-way communication method according to one of claims 1 to 5, wherein the method realizes point-to-point two-way communication of the underwater fixed platform to a single underwater mobile platform, the underwater fixed platform is used as a communication initiator, and a photoacoustic cascade communication link is established with the single underwater mobile platform.
7. The underwater fixed platform photoacoustic effectiveness enhancement two-way communication method according to one of claims 1 to 5, wherein the method realizes point-to-multipoint broadcast communication of the underwater fixed platform to a plurality of underwater mobile platforms, the underwater fixed platform is used as a communication initiator, a broadcast information transmission mode is adopted to initiate communication and establish a laser sound level communication link, and other underwater mobile platforms receive and demodulate acoustic signals as required and select whether to respond or not according to actual conditions.
8. The underwater mechanical fixed platform photoacoustic efficiency enhancement two-way communication method according to one of claims 1 to 5, wherein the method realizes underwater mobile platform multiple access communication, and is oriented to underwater wireless communication networking requirements, and the underwater fixed platform is used as an access point to establish a laser sound level communication link to support multiple access of multiple underwater platforms in different modes.
9. A system for implementing the underwater mechanical fixed platform photoacoustic effectiveness enhancing two-way communication method of claims 1-8, comprising
An information laser emission array channel, an encoder, a modem, a decoder, a laser induced acoustic communication module and an underwater acoustic towed array receiving channel,
the information laser emission array channel is used for transmitting information to be transmitted to the encoder;
the encoder converts the information into a digital baseband signal and transmits the digital baseband signal to the modem;
the modulator-demodulator is used for modulating the baseband signal and outputting a band-pass signal, demodulating the received band-pass signal and outputting the baseband signal, and meanwhile, the modulator-demodulator is used for sending synchronous clock pulses by the laser emission array channel, the underwater sound receiving channel and the laser induced sound communication module;
the laser array transmitting channel is used for transmitting the band-pass signal output by the modem to the laser acoustic communication module;
the laser acoustic communication module is used for exciting the band-pass signal output by the information laser emission array channel to a laser emission array consisting of a plurality of laser sources to generate a high-energy laser pulse signal, and the laser pulse signal acts on a water body to form a rapidly-expanded plasma cavity so as to excite a surrounding medium to form sound waves;
and the underwater acoustic towed array receiving channel is used for converting the received underwater acoustic signals into band-pass electric signals through the hydrophone/array and then sequentially outputting the band-pass electric signals to the modem and the decoder, completing the whole underwater acoustic communication process and establishing a stable opto-acoustic cascade bidirectional communication link between underwater machine-fixed platforms.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 8.
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