40 results about "Underwater wireless communication" patented technology

An underwater wireless communication system and method includes a sensor node for transforming measured underwater data into ultrasound signals, and transmitting the transformed ultrasound signals and receiving other ultrasound signals.

The invention relates to an underwater communication system. The underwater communication system comprises a sensor, a transmitting sub-system and a receiving sub-system, wherein the sensor is used for sensing an external environment, and assisting an underwater wireless communication node in automatically selecting a proper communication mode and a corresponding modulation-demodulation mode; the transmitting sub-system consists of an encoding unit, an adaptive modulation unit and an transmitting unit; the transmitting sub-system is used for transmitting a signal to be transmitted to a corresponding channel of the transmitting unit after the signal is encoded by the encoding unit and demodulated by the adaptive modulation unit, and converting an electric signal into an acoustic signal or an optical signal to transmit the acoustic signal or the optical signal; the receiving sub-system consists of a receiving unit, an adaptive demodulation unit and a decoding unit; and after a corresponding channel of the receiving unit receives the acoustic signal or the optical signal and converts the acoustic signal or the optical signal into the electric signal, the electric signal is demodulated by the adaptive demodulation unit, and an original signal is demodulated by a decoder of the decoding unit lastly. Through adoption of the underwater communication system, reliable transmission of data or instructions within a communication network range is realized.

The present invention provides an underwater wireless communications hotspot comprising an active zone which is circumscribed by a large closed loop antenna and within which wireless communication by means of electromagnetic signals can take place. The wireless communications hotspot of the present invention is suitable for data transfer between a communications node of the wireless hotspot and a receiver mounted on a mobile unit which is located inside the active zone of the hotspot. The wireless hotspot of the present invention provides a means for high bit rate data transfer from the communications node and the mobile unit, due to improved uniformity of coverage within the active zone of the hotspot and due to a reduction in the attenuation with distance compared to communications at positions outside the perimeter of a loop antenna.

The invention relates to a laser guide and communication device and particularly relates to a laser guide and communication device for underwater vehicle docking. The device comprises a supersonic wave water sound positioning device fixedly mounted on an underwater vehicle, an underwater vehicle end laser transceiver which is fixedly packaged at the front of a cabin body of the underwater vehicle, and a platform end laser transceiver which is used for carrying out communication docking with the underwater vehicle and comprises a holder and the sealed cabin body, wherein the underwater vehicle end laser transceiver comprises a position solution and control unit, a docking laser device, a docking beam collimation lens, an underwater device photoelectric detection device and an electric light modulator. The device employs two laser beams on the underwater device and the docking platform as position indicating means for docking, a four-quadrant photoelectric detector or an image sensor and double silicon band amplification photoelectric detectors are employed for docking and communication, docking precision can be improved, and underwater wireless communication can be realized. The device has advantages of simple structure, flexible operation, technological cost reduction and strong versatility.

In a wireless communication system including a transmitter device and a receiver device used for transmission of wireless signals having a plurality of sub-carriers, the transmitter device performs error correction coding on transmitting data and selects at least one of the plurality of sub-carriers used for transmission of error-correction coded data as a null sub-carrier having zero amplitude, thus transmitting the error-correction coded data, while the receiver device receives signals having the plurality of sub-carriers from the transmitter device so as to retrieve original transmitted data by implementing error correction decoding on received signals, thus determining whether an interference wave occurs in the sub-carrier upon detecting reception power exceeding a predetermined threshold in the sub-carrier serving as the null sub-carrier.

The invention discloses an omni-directional precise-control ignition system for oil tube transmission. The omni-directional precise-control ignition system comprises an intelligent telemetry device and a gun head main control device internally provided with a detonator; one end of the gun head main control device is connected with an oil tube, the other end of the gun head main control device is connected with a first perforating gun, bullet carriers are placed in the first perforating gun, motors are mounted in the gun head main control devices, motor shafts are connected with directional devices in the gun head main control devices, and the motors are mounted on the bullet carriers; a plurality of between-gun measuring and control devices internally provided with detonators are mounted behind the first perforating gun, the other ends of the between-gun measuring and control devices are connected with second perforating guns, bullet carriers are placed in the second perforating gun, motors are mounted in the between-gun measuring and control devices, motor shafts connected with directional devices in the gun head main control devices, and the motors are mounted on the bullet carriers; one end of the intelligent telemetry device is connected with a PC through a depth-correction pup joint and a ground control instrument, the other end of the intelligent telemetry device is indirectly connected with the gun head main control device in an underwater wireless communication mode, and the gun head main control device is indirectly connected with the between-gun measuring and control devices through wireless transmission. The omni-directional precise-control ignition system is precise in direction measuring and capable of achieving real-time control.

The invention relates to an underwater image transmission method and an underwater image transmission system based on a wireless underwater acoustic communication technology. The method comprises thesteps of marking a plurality of data packets acquired by cutting underwater image data; sequentially sending the data packets to a receiving end according to marks; when the data packet is failed to receive, resending the data packet with the corresponding mark according to the mark of the fed back data packet, until all the data packets are successfully received. According to the method and the system provided by the invention, underwater image transmission is achieved, the data packet with a transmission mistake is fed back, and the data packet with the corresponding mark is sent again, so that data receiving quality is improved, and definition and completeness of underwater images acquired latterly are ensured. The underwater image transmission system provided by the invention is basedon wireless underwater acoustic communication, and has the advantages of low underwater acoustic communication cost and high flexibility compared with a cable wire which as the disadvantages of beingheavy, easy to damage and difficult to maintain. In an underwater environment, underwater sound is used as an underwater wireless communication means so as to be more practical and effective.

An underwater machine has a magnetic keystoke control device, can be used in underwater operation devices such as an underwater camera, a video camera, a diving illumination lamp, an underwater wireless communication device and the like, a control key with a magnetic repulsive characteristic is provided at two inner and outer corresponding sides in a body housing and correspondingly to positions of functional keys of cameras and video cameras mounted in the body housing, the control key includes at least a pressing button provided at an outer side of the body housing and at least a contact control button provided at an inner side of the body housing, an object of effectively operating the machine can be realized without passing through the body housing by the pressing button indrectly contacting and controlling the functional keys of devices such as the camera, video camera, diving illumination lamp and the like, and using a repulsive theory of the pressing button and the contact control button.

The invention provides a low-frequency voice communication system based on a piezoelectric mechanical antenna. The communication system comprises a function signal generator, a power amplifier, a feed support, a loop antenna, a lock-in amplifier and a computer. The computer controls the function signal generator to generate an electromagnetic wave signal needing to be transmitted, the power amplifier amplifies the power of a radio frequency signal output by the function signal generator, and excites the piezoelectric ceramic through the feed support to generate an inverse piezoelectric effect and radiate electromagnetic waves. The loop antenna receives an electromagnetic wave signal radiated by the piezoelectric ceramic, transmits the electromagnetic wave signal to the lock-in amplifier for signal filtering and amplification, and converts the signal into a voice signal of a transmitting end through the computer. The low-frequency voice communication system based on the piezoelectric mechanical antenna is simple in equipment installation, small in size and high in information transmission efficiency, and has very high application value in the aspects of underwater wireless communication, positioning, navigation and the like.

The invention belongs to the technical field of optical communication equipment, and discloses a double-light-source underwater wireless communication system. The system comprises a main control end, a light transmitting end and a light receiving end; the main control end is respectively connected with the light emitting end and the light receiving end; the light emitting end comprises an LD emitting unit and an LED emitting unit, the LD emitting unit is used for emitting an LD light beam, and the LED emitting unit is used for emitting an LED light beam; the light receiving end comprises an APD receiving unit and a PMT receiving unit, the APD receiving unit is used for receiving the LD light beam, and the PMT receiving unit is used for receiving the LED light beam; and the main control end is used for controlling the switching of the transmitting unit and the switching of the receiving unit. The system can realize dual-light-source underwater wireless communication, can realize communication at a long distance and a short distance, and is low in cost and wide in application range.

The invention discloses an underwater blue light communication device and system, and an underwater mobile target tracking method, belonging to the technical field of underwater wireless communication. The underwater blue light communication device at least comprises an installation base, a blue light emitting LED, a USBL transducer, a turning table, a driving wheel, a speed reducer, a slide ring, an underwater motor, and a control cabin. The blue light emitting LED is fixed on the turning table, the turning table is fixed with the slide ring, the driving wheel is connected with the turning table through a synchronous belt, the driving wheel is connected with the speed reducer, the underwater motor is connected with the speed reducer, the underwater motor is connected with the control cabin, the speed reducer, the underwater motor and the slide ring are fixed above the installation base, and the USBL transducer and the control cabin are fixed below the installation base. The communication angle of visual field of the blue light beam is increased, and when the underwater mobile target is not within the communication angle of visual field of the blue light beam, underwater blue light communication still succeeds, so that the underwater blue light communication device and the underwater mobile target keep communicating.

The invention discloses an intelligent autonomous navigation underwater detection robot. The robot comprises an aircraft main body, an upper camera is fixedly mounted at the top of the aircraft main body, a lower camera is arranged at the center of the bottom surface of the aircraft main body, and water quality monitoring sensors are fixedly mounted on the lower surface of the aircraft main body and located on the left side and the right side of the lower camera. A streamline design is adopted for the appearance of the robot, and the appearances of multiple rotors, bionic bodies and the like are adopted according to requirements; various requirements are met; motion control is flexible; different sensors are carried for different machines, so that different technical requirements are met; meanwhile, remote control is not needed, autonomous path planning and autonomous cruising can be achieved, and cameras at different positions can flexibly avoid obstacles while obtaining information; and the robot can reduce dependence on underwater wireless communication, meanwhile, the project makes full use of the subject advantages of aquaculture, mechanical manufacturing, marine fishery and the like, and the robot has a wider application prospect.

When time at present is included in a high-traffic time period, an interference determining unit (37) determines that there is a possibility that a downlink signal to be received by any wireless terminal has interference with a pilot signal transmitted from a wireless base station. A pilot signal transmission control unit (40) controls the transmission of the pilot signal, which is included in an OFDMA frame or an OFDM frame. When it is determined that there is the possibility of interference, the pilot signal transmission control unit (40) stops the transmission of the pilot signal or reduces power of the pilot signal in a whole or a portion of a user data area.

The invention discloses a phase compensation method realized by dynamic Doppler tracking of underwater sound continuous signals, and belongs to the field of underwater wireless communication and signal processing thereof. The problems that according to an existing method for conducting phase compensation through Doppler tracking, information synchronization of a receiving end is not accurate, effective information cannot be accurately obtained, and the frequency band utilization rate is low in the communication process are solved. The method comprises the following steps: performing correlation processing on a received signal and a local complex passband reference signal to obtain a passband correlation signal; carrying out symbol-by-symbol Doppler estimation on the obtained passband correlation signal; wherein the Doppler estimation value is used for compensating phase deviation of a received signal and generating a new local complex passband reference signal as a reference signal of a next processing unit so as to compensate amplitude attenuation introduced by dynamic Doppler. The method is mainly suitable for an underwater acoustic spread spectrum communication system in a dynamic Doppler scene.

The invention discloses a security underwater transmission method capable of supporting confusion and zero knowledge. The method includes following steps: (1) an initialization stage: a gateway GW generates key materials and distributes the key materials to an underwater vehicle A and an underwater vehicle B; (2) a neighbor discovery stage: the underwater vehicle A and the underwater vehicle B generate and broadcast temporary identities when the two underwater vehicles meet underwater; and (3) a data transmission stage: a sending party firstly generates primary identity information of both parties, performs data encryption and signature, and sending related information to a receiving party; and the receiving party receives the information, verifies whether the receiving party is a correct receiving party, then calculates the temporary identity of the sending party, and decrypts and verifies the received data. According to the method, opponents can be prevented from detecting the related information of the underwater vehicle or counting, and the problem of the conventional underwater wireless communication is solved.

When time at present is included in a high-traffic time period, an interference determining unit (37) determines that there is a possibility that a downlink signal to be received by any wireless terminal has interference with a pilot signal transmitted from a wireless base station. A pilot signal transmission control unit (40) controls the transmission of the pilot signal, which is included in an OFDMA frame or an OFDM frame. When it is determined that there is the possibility of interference, the pilot signal transmission control unit (40) stops the transmission of the pilot signal or reduces power of the pilot signal in a whole or a portion of a user data area.

Provided is an infrasonic wave communication device which belongs to the technical field of wireless communication. The infrasonic wave communication device comprises an infrasonic wave emission system and an infrasonic wave reception system, and is a communication tool for information transmission within a certain distance and designed by utilizing acoustic-electric transition and information processing technology. The infrasonic wave communication device is formed by connecting a trumpet-shaped infrasonic wave generator (2) and a cylindrical infrasonic wave generator (3) with an information processor (1). The infrasonic wave, which cannot be received by human ears, spreads faster and farther in the solid and liquid than in the air. Through an acoustic-electric transition device, and by means of computer infrasonic wave acoustic-electric transition system software, not only digital information can be converted into infrasonic wave information, which is then emitted out, but also extremely weak infrasonic wave information can be identified and received, and converted into the easy-to-use digital information. Therefore, the infrasonic wave communication device can overcome the defect that it is difficult for radio wave to spread in solid-phase and liquid-phase mediums, and is suitable for underground and underwater wireless communication within a certain distance.

The invention discloses a testing system of an underwater walking robot and a working method thereof. The testing system is composed of a land control analysis system and a water test system. The land control analysis system arranged at the land consists of an industrial control computer and a land wireless communication module. The underwater test system consists of a water tank, an underwater walking robot with attitude and leg strength information feedback, an ocean current detection part, an underwater wireless communication part, a floating part and a connecting cable part; the ocean current detection includes a pre-acoustic Doppler flow velocity section plotter and a post-acoustic Doppler velocity section plotter; the underwater wireless communication part is formed by three underwater wireless communication modules; the floating part is composed of a first spherical floating device, a second spherical floating device and a third spherical floating device; and the connecting cable part includes a first connecting cable, a second connecting cable and a third connecting cable. The system has advantages of simple structure, low cost, easiness in realization, and high precision and repeated testing can be carried out.

The invention discloses a method and a system for improving underwater blue-green laser communication reliability, which belong to the field of underwater wireless communication, and are characterized in that data preprocessing and peak value judgment are combined with adaptive threshold value judgment, data preprocessing and denoising are carried out on pulses of a laser communication system, peak value judgment is carried out on denoised data, and the reliability of underwater blue-green laser communication is improved. And meanwhile, recovering the laser information in combination with a self-adaptive threshold judgment mode, and finally recovering the laser system transmitting end information. According to the invention, the defects in the prior art are overcome, a good inhibition effect on underwater noise interference of laser communication is achieved, information loss caused by underwater laser refraction and scattering is effectively avoided, and the reliability of underwater laser communication is improved.

The invention discloses a pressure-resistant sealed cabin for underwater long-distance wireless communication, and relates to the field of underwater detection communication. The pressure-resistant sealed cabin comprises a pressure-resistant glass window, a first sealing end cover, a lens module, a pressure-resistant cabin body, a communication circuit module, a circuit board fixing frame, a second sealing end cover and a watertight connector, the pressure-resistant glass window is connected with the first end of the first sealing end cover; the second end of the first sealing end cover is connected with the lens module; the first sealing end cover is connected with the first end of the pressure-resistant cabin body; the communication circuit module is installed in the pressure-resistant cabin body, circuit board fixing frames are arranged at the two ends of the communication circuit module respectively to be attached to the inner wall of the pressure-resistant cabin body, the communication circuit module is used for transmitting or receiving optical signals, the second sealing end cover is connected with the second end of the pressure-resistant cabin body, and the watertight connector penetrates through the second sealing end cover to be connected with the communication circuit module; the pressure-resistant sealed cabin has high water tightness and seawater corrosion resistance, can provide a safe and reliable sealing environment for underwater wireless communication facilities, and is simple and reliable in structure and convenient to install, construct and arrange.

The invention relates to a circuit for controlling underwater wireless communication of a lead fish based on double water inflow signals, and a control method thereof, and belongs to the field of hydrological detection devices. The circuit provided by the invention comprises an LM358 water surface switch circuit, an MS5837 pressure sensor circuit, an STM32L1 microprocessor and a LoRa wireless communication circuit; and the LM358 water surface switch circuit and the MS5837 pressure sensor circuit are connected with the STM32L1 microprocessor, and the STM32L1 microprocessor is connected with theLoRa wireless communication circuit. According to the circuit provided by the invention, the MS5837 pressure sensor circuit is installed at the bottom of the lead fish, the LM358 water surface switch circuit is installed at the same height location parallel to a rotor flow meter. The circuit provided by the invention introduces a double-signal detection method of a water pressure detection signal and a water inflow signal, controls the power supply of the wireless communication module, and solves the problem of unstable power supply caused by the jitter of the water inflow signal and the problem of easy flow measurement interruption caused by the excessive power consumption of the wireless communication module.

The invention discloses a precise comprehensive-control underwater wireless communication remote transmission device. The device comprises a framework shell (1), a window opening protection pipe (6) and a pin insertion joint (7); the framework shell (1) is connected with the window opening protection pipe (6) through a magneto-resistance joint (4), a circuit framework (2) is mounted in the framework shell (1), a circuit board is mounted on the circuit framework (2), and a circuit framework insertion plug (3) is fixedly welded to the circuit framework (2); the window opening protection pipe (6)is in threaded connection with the pin insertion joint (7); the two ends of the window opening protection pipe (6) are provided with sealing insertion pins (5) which are connected through a communication line, the circuit framework insertion plug and the sealing insertion pins are fixed to the magneto-resistance joint (4), and the window opening protection pipe is communicated with the circuit framework insertion plug through the sealing insertion pins. The device receives a measurement control instruction sent by a ground system, and has the advantages of being accurate in azimuth measurement, capable of achieving real-time control, convenient to install and operate, capable of getting rid of limiation of construction sites, excellent in construction effect, high in safety and the like.

The utility model relates to an underwater wireless voice electromagnetic communication simulating system and relates to a realizing method of an underwater wireless voice electromagnetic communication system. Voice signals of the system are input by a microphone (1), the rear end of the microphone (1) is connected with a pre-posed low noise amplifier circuit (2), the rear end of the pre-posed low noise amplifier circuit (2) is connected into a band-pass filter (3), the band-pass filter (3) is connected with a power amplifier (4), and finally the signals are sent to an antenna (C) by a matching network (5); a signal receiving part (B) firstly passes through a primary difference amplifying circuit (9), and then is connected with a high-pass filter (10), a secondary amplifying circuit (11), a low-pass filter (12), an automatic gain control circuit (13) and an earphone amplifying circuit (14), and finally the voice signals are restored; and real time voice can be heard from an earphone (15). The system is good in performance, can realize short-distance real time communication function with low noise under water, and adopts a half-duplex communication manner.

The invention discloses an underwater wireless communication method and system with adaptive light and sound switching. The method comprises a step of detecting a channel signal-to-noise ratio between two communication nodes, a step of selecting a fixed sound communication mode or different light communication modes as an agreed communication mode between the two communication nodes according to the channel signal-to-noise ratio, and a step of executing the data transmission between the two communication nodes according to the agreed communication mode. The method and the system have the advantage that the communication mode can be adaptively selected according to the condition of a communication channel.

The invention discloses an underwater wireless communication circuit for an oil-gas well. The underwater wireless communication circuit comprises an ultrasonic transducer, a single chip microcomputer,a sending circuit and a receiving circuit; the ground sends an electrical signal instruction to the single chip microcomputer in an intelligent telemetry device through a cable; the single chip microcomputer sends an electrical signal into the sending circuit of the intelligent telemetry device; the sending circuit converts a low-voltage signal to a high-voltage signal and sends the high-voltagesignal to the ultrasonic transducer; the ultrasonic transducer processes the high-voltage signal into an electromagnetic wave signal with a high-voltage characteristic; and the ultrasonic transducer sends the electromagnetic wave signal to the receiving circuit in a gun head master control device. Wireless communication, in an oil and water mixture, between the intelligent telemetry device and thegun head master control device is achieved through ultrasonic waves, internal and external pressure balance in a sensor adopted for the ultrasonic waves is achieved through a high-temperature-resistant piezoelectric ceramic piece and a rubber case structure with an inner cavity filled with silicone oil, and thus the purpose of high temperature resistance and high pressure resistance of the sensoris achieved.

The invention provides an underwater blue-green light high-speed full-duplex communication-in-motion system and method, and solves the problems of large time delay, low communication rate, poor carrier maneuverability and adoption of a half-duplex communication mode in existing underwater wireless communication. The system comprises two communication devices which communicate with each other; each communication device comprises a transmitter and a receiver; the transmitter comprises a master control and information interaction unit, a modulation and driving unit, an optical signal transmitting array and a homogenizing mirror; the main control and information interaction unit processes the service data and outputs a square wave signal; the modulation and driving unit outputs N paths of excitation signals according to the square wave signal; the optical signal emission array comprises N laser diodes connected in parallel; the receiver comprises a wavelength selection unit, a bias voltage unit, a diversity reception and gating unit, a variable gain amplifier unit and an ADC circuit unit. Wherein the transmitter of one communication device outputs signal blue light, the transmitter of the other communication device outputs signal green light, and the receivers of the two communication devices receive signals output by each other.

The invention discloses a data scheduling method and system based on underwater wireless communication resources and a storage medium, and the method comprises the steps: calculating a wireless signalelectromagnetic layer parameter according to an underwater wireless communication resource data scheduling rule; establishing an underwater wireless communication resource data model according to thewireless signal electromagnetic layer parameters and underwater wireless communication resource data scheduling information; constructing a wireless POW strategy algorithm model according to the underwater wireless communication resource data model; according to the wireless POW strategy algorithm model and the wireless signal electromagnetic layer parameters, establishing the wireless POW strategy algorithm model; cooperatively introducing a PTS-R time slice round-robin scheduling algorithm; constructing an underwater wireless communication resource data autonomous scheduling module, achieving data scheduling. The problem that scheduling delay is high due to the fact that a traditional algorithm is insufficient is effectively solved, the processing time of underwater wireless communication resource data scheduling is shortened, and the underwater wireless communication resource data scheduling processing rate and processing capacity of underwater wireless communication are increased.

Stable clock synchronization is ensured even under a multi fading environment such as the non-line-of-sight communication.On a transmission side, multiplying a clock signal by a spreading code, a spread-spectrum clock signal is generated whose spectrum being made to spread; frequency conversion is performed on a signal obtained by superimposing an information signal on the spread-spectrum clock signal and a radio signal is transmitted by wireless. On the other hand, on a receiving side, the radio signal is received, frequency conversion is performed on the radio signal, and a frequency-converted radio signal is divided into two lines. A clock signal extracted by performing spectrum despreading on one of divided radio signals by multiplying a spreading code; and clock synchronization is performed on other one of the divided radio signals using the clock signal having been extracted.