Kongsberg EM 3002, Product Description

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Product description
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855-164929 / A
1 SYSTEM OVERVIEW
Key facts
The Kongsberg EM 3002 multibeam echo sounder is a very
high resolution seabed mapping and inspection system meeting
the most demanding standards for survey accuracy. The
minimum operating depth is from less than 1 m below its
transducers, and in typical sea water conditions the system
operates to more than 150 m depth (less in warm water and
more in fresh water). Small dimensions and low weight makes
the system portable and easy to install. This allows use on
survey launches and subsea vehicles to 1500 m water depth.
The EM 3002 system has a very high ping rate of up to 40 Hz, a
large number of measurements per ping (up to 254 per sonar
head), 1.5
°
beamwidth, and electronic pitch and roll
stabilization. 100% coverage of the bottom is achievable at
vessel speeds of about 10 knots in shallow waters with
acrosstrack coverage of up to four times depth with a basic
system. At larger depths the achievable coverage may be up to
200 m, and then 100% coverage is achievable with vessel
speeds up to 20 knots.
The EM 3002 may be configured to use two sets of transducers
(Sonar Heads). This increases the shallow water coverage to up
to ten times the depth, and the number of measurements per
ping up to 508. With an angular coverage sector of nominally
200
°
(with the heads tilted 40° to each side) the dual system also
allows surveying to the water surface along shorelines, river
banks and man-made structures.
The EM 3002 beamspacing may be set to equiangular or
equidistant. The beams are electronically roll stabilized. The
coverage may be limited by the operator either in angle or in
swath width without reducing the number of beams. In the near
field dynamic focussing is employed. A combination of phase
and amplitude bottom detection algorithm is used, resulting in a
measurement accuracy of 5 cm RMS being achievable.
The system sonar frequency is nominally 300 kHz allowing
small dimensions, good range capability and high tolerance to
turbid waters. The transmit fan may be widened as an aid to
target detection. Integrated seabed acoustical imaging capability
is included as standard. Options include display and logging of
beamformed water column data and of raw stave data (before
beamforming).