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Kansas study on whether relatively new live imaging sonar technology enables casual anglers to catch more crappie concluded it does, but not by much.
Side-scan uses a sonar device that emits conical or fan-shaped pulses down toward the seafloor across a wide angle perpendicular to the path of the sensor through the water, which may be towed from a surface vessel or submarine (called a “towfish”), or mounted on the ship's hull.
Optical imaging systems have been successfully used in deep ocean searches, either independently or in combination with a side-scan sonar. The obvious advantage of an optical imaging system is that the image produced can result in identification of the target without the need for time-consuming contact classification.
Side-scan sonar and multi-beam sonar. A dragline is a line which is towed ether across the bottom, or at a depth controlled by floats and weights, or hydrodynamically, by paravanes or otter-boards, that is intended to snag the target, indicating its position. Cadaver dogs
The first fishfinder, i.e. sonar device meant to find underwater fish or schools of fish, was invented in Japan in the 1940s by the Furuno brothers, who were radio repairmen. Building from the knowledge of fishermen who were able to determine the presence of fish, and their number, from bubbles, the Furuno brothers first planned to detect these ...
Multibeam sonars project a fan-shaped set of sound beams outward into the water and record echoes in each beam. These have been widely used in bathymetric surveys, but have recently begun to find use in fisheries acoustics as well. Their major advantage is the addition of a second dimension to the narrow water column profile given by an ...
The picture is a side-scan sonar composite image of Wyse's Ferry Bridge where it sits today at the bottom of Lake Murray (South Carolina). On the right is a picture of what the bridge looked like in 1919 before the lake was built. Lake Murry began construction in 1927 and was completed in 1930.
Short baseline systems determine the position of a tracked target such as a ROV by measuring the target's distance from three or more transducers that are, for example, lowered over the side of the surface vessel from which tracking operations take place.
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