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Underwater acoustic communication

Index Underwater acoustic communication

Underwater acoustic communication is a technique of sending and receiving messages below water. [1]

21 relations: Acoustic release, Acoustic wave, Attenuation, Digital signal processor, Direct-sequence spread spectrum, Electromagnetic radiation, Fessenden oscillator, Frequency modulation, Frequency-hopping spread spectrum, Frequency-shift keying, Hydrophone, Maritime radionavigation service, MIMO, Multiple frequency-shift keying, Orthogonal frequency-division multiplexing, Phase-shift keying, Pulse-position modulation, Radio propagation, Sonar, Speed of sound, Underwater acoustics.

Acoustic release

An acoustic release is an oceanographic device for the deployment and subsequent recovery of instrumentation from the sea floor, in which the recovery is triggered remotely by an acoustic command signal.

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Acoustic wave

Acoustic waves (also known as sound waves) are a type of longitudinal waves that propagate by means of adiabatic compression and decompression.

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Attenuation

In physics, attenuation or, in some contexts, extinction is the gradual loss of flux intensity through a medium.

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Digital signal processor

A digital signal processor (DSP) is a specialized microprocessor (or a SIP block), with its architecture optimized for the operational needs of digital signal processing.

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Direct-sequence spread spectrum

In telecommunications, direct-sequence spread spectrum (DSSS) is a spread spectrum modulation technique used to reduce overall signal interference.

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Electromagnetic radiation

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.

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Fessenden oscillator

A Fessenden oscillator is an electro-acoustic transducer invented by Reginald Fessenden, with development starting in 1912 at the Submarine Signal Company of Boston.

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Frequency modulation

In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.

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Frequency-hopping spread spectrum

Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.

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Frequency-shift keying

Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.

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Hydrophone

A hydrophone (Ancient Greek ὕδωρ.

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Maritime radionavigation service

Maritime radionavigation service (short: MRNS) is – according to Article 1.44 of the International Telecommunication Union´s (ITU) Radio Regulations (RR) – defined as "A radionavigation service intended for the benefit and for the safe operation of ships." This service is a so-called safety-of-life service, must be protected for interferences, and is essential part of navigation.

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MIMO

In radio, multiple-input and multiple-output, or MIMO (pronounced or), is a method for multiplying the capacity of a radio link using multiple transmit and receive antennas to exploit multipath propagation.

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Multiple frequency-shift keying

Multiple frequency-shift keying (MFSK) is a variation of frequency-shift keying (FSK) that uses more than two frequencies.

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Orthogonal frequency-division multiplexing

In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies.

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Phase-shift keying

Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave).

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Pulse-position modulation

Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of 2^M possible required time shifts.

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Radio propagation

Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another, or into various parts of the atmosphere.

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Sonar

Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.

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Speed of sound

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

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Underwater acoustics

Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries.

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Redirects here:

Submarine signalling, Underwater acoustic wireless communication system.

References

[1] https://en.wikipedia.org/wiki/Underwater_acoustic_communication

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