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EM 710 Multibeam echosounder
The EM 710 multibeam echosounder is a high to very high resolution seabed mapping
system capable of meeting all relevant survey standards. The system configuration
can be tailored to the user's requirement, allowing for choice of beam widths as
well as transmission modes. The minimum survey depth is from less than 3 meters
below the transducers, and the maximum depth is approximately 2000 meters, somewhat
dependant upon array size. Across track coverage (swath width) is up to 5.5 times
water depth, to a maximum survey depth more than 2000 meters.
EM 710 Multibeam echosounder models
There are three basic versions of the EM 710 multibeam echosounder each with
different range performances:
- EM 710 - Full performance version
- EM 710S - CW pulse forms only
- EM 710RD - Short CW pulse only
Alternative post processing software
Note: KONGSBERG is not responsible for any system malfunction
caused by 3rd party software.
Defining a new resolution standard for bathymetric surveys
One of the goals when we developed the EM 710 0.5x1 multibeam echo sounder system
was to offer to the market a higher standard of resolution than previously possible.
The improved resolution is provided by the 0.5 degree, focussed transmit beam -
in combination with high density processing applied to the high number of dynamically
focussed receive beams. The 0.5 degree transmit beam has a very small footprint,
only 85cm long at 100m depth. So in order to ensure 100% bottom coverage even at
high survey speeds we developed a new scheme by which 2 complete sounding profiles
are generated for each ping cycle. By reducing the swath width, the operator can
also increase the ping rate, see the graph below:
So at 100m depth, with full swath width +/-70 degrees the system has 2 pings
per second, or 4 sounding profiles. The maximum survey speed while maintaining 100%
bottom coverage is then 3.4 m/sec or 6.8 knots. By reducing the swath width to +/-
55 degrees, the ping rate is increased to 3.4 and the survey speed can then be raised
to 11.5 knots. Each sounding profile consists of 400 soundings.