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2. Underwater acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Underwater_acoustic...

   An underwater acoustic positioning system[1][2] is a system for the tracking and navigation of underwater vehicles or divers by means of acoustic distance and/or direction measurements, and subsequent position triangulation. Underwater acoustic positioning systems are commonly used in a wide variety of underwater work, including oil and gas ...

3. Long baseline acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Long_Baseline_Acoustic...

   A long baseline (LBL) acoustic positioning system[1] is one of three broad classes of underwater acoustic positioning systems that are used to track underwater vehicles and divers. The other two classes are ultra short baseline systems (USBL) and short baseline systems (SBL). LBL systems are unique in that they use networks of sea-floor mounted ...

4. Ultra-short baseline acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Ultra-short_baseline...

   USBL (ultra-short baseline, also known as SSBL for super short base line) is a method of underwater acoustic positioning. A USBL system consists of a transceiver, which is mounted on a pole under a ship, and a transponder or responder on the seafloor, on a towfish, or on an ROV. A computer, or "topside unit", is used to calculate a position ...

5. AN/SLQ-25 Nixie - Wikipedia

   en.wikipedia.org/wiki/AN/SLQ-25_Nixie

   AN/SLQ-25 Nixie. The AN/SLQ-25 Nixie and its variants are towed torpedo decoys used on US and allied warships. It consists of a towed decoy device (TB-14A) and a shipboard signal generator. The Nixie is capable of defeating wake-homing, acousting-homing, and wire-guided torpedoes. The decoy emits signals to draw a torpedo away from its intended ...

6. Sonar signal processing - Wikipedia

   en.wikipedia.org/wiki/Sonar_signal_processing

   Sonar signal processing. Sonar systems are generally used underwater for range finding and detection. Active sonar emits an acoustic signal, or pulse of sound, into the water. The sound bounces off the target object and returns an echo to the sonar transducer. Unlike active sonar, passive sonar does not emit its own signal, which is an ...

7. GPS sonobuoy - Wikipedia

   en.wikipedia.org/wiki/GPS_sonobuoy

   GPS sonobuoy or GPS intelligent buoy (GIB) are a type of inverted long-baseline (LBL) acoustic positioning devices where the transducers are installed on GPS -equipped sonobuoys that are either drifting or moored. [1] GIBs may be used in conjunction with an active underwater device (such as a pinger equipped torpedo), or with a passive acoustic ...