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Service + Software for Seafloor Mapping


Multibeam Sonars / Overview


Sensors Supported:

Atlas Fansweep

Atlas Hydrosweep

Odom Echoscan

Reson SeaBat: 9001/81XX

Simrad EM12/EM950

Simrad EM300/1000/3000

SeaBeam 2112

A multibeam sonar operates much like a single-beam echo sounder - ensonifying the bottom and detecting echo arrival times.

Unlike the single-beam sonar, which illuminates a single point beneath the sonar, the multibeam sonar illuminates a narrow swath elongated across the bottom and perpendicular to the path of the boat. This illuminated swath is then sampled with multiple, discrete “receive beams” formed by the sonar at known angles. For each beam, the sonar attempts to determine the “best” echo arrival time. With the known beam angle, the determined “best” echo travel-time, and the water-column sound velocity, the cross-track distance and depth can be determined.