towfish

GeoChirp has been developed to use standard towfish and transducers.

Chirp generation and power amplifier hardware mounted on the towfish.

The standard system employs a lightweight towfish, which is easily deployed by one person and can operate to a depth of 1000 metres.

An actively stabilizing towfish which is adaptable for wet or dry payload capacities.

Side scan sonar systems are generally comprised of a towfish, tow cable, and recording device-in this case, a personal computer.

In this technique, shaped waves of sound are sent out from a small assembly called a towfish that is towed on the surface behind a ship.

Minesweeping operation with the "Towfish"

The towfish being used by the Fugro Discovery collides with an undersea mud volcano.

The AUV is used to scan areas which cannot be effectively searched by the towfish on the other three vessels.

Fugro Discovery leaves port in Fremantle with a new towfish named Intrepid.

Internally the new electronics board has no sockets and towfish software updates are downloaded electronically instead of by exchanging chips.

In order to get closer to the bottom in deep water the side-scan transducers were placed in a "towfish" and pulled by a tow cable.

During Route Survey tasks, the ships deploy a partially controllable "towfish" fitted with side scan sonar.

The towing cable breaks and the towfish along with 4,500 metres of towing cable sink to the seafloor.

Unlike the towfish, the AUV is self-propelled and can manoeuvre itself to maintain a constant altitude above the seafloor.

Pitt helped Hall drop over the magnetometer sensor and the side-scan sonar towfish, trailing them behind the stern of the boat on tethered cables.

Acoustic impulses are transmitted laterally from a towed fish, reflect off "bottom roughness" and the reflected return signals are recorded at the towfish.

Underwater Positioning Systems Category Layback (towfish) and wire angle technique (samplers)

Shortly after one of the towfish was deployed, while descending, an acoustic signal was detected at a frequency of 33 kHz on 5 April.

Ballast control systems - depth control, bottom-following, vertical yo-yo trajectory, depressors, use of wing on towfish for downforce, adjustable wings.

Dorado with Aurora towfish Since the hull of the vehicle is deeply submerged, drag is greatly reduced over that of a surface drone.

An optional Sub-Bottom Profiling head can be attached to the towfish to enable simultaneous profile records to be obtained during sidescan operations.

One such task uses the DOLPHIN to tow a small "towfish" at a perscribed distance and depth.

It uses standard GeoAcoustics towfish, sidescan and the new GeoChirp II components at top and bottom.

Responder interface Survey operators know that absolute or even relative position of a towfish on even a modest length of cable cannot be assumed or predicted.