OPTIONS TO FIT ANY PLATFORM FOR SEABED MAPPING TO 3600 METERS DEPTH

Modular and flexible design

EM 712 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 less than 3 meters below the transducers, and the maximum depth is an unmatched 3600 meters. Across track coverage (swath width) is now more than 3500 meters. This is almost double the range performance of the EM 710.

Further key advances made for the EM 712 include low-noise receiver transducers and electronics in addition to a smaller, lighter form factor, enabling more flexible installation on a wider variety of platforms.
Acoustic ice protection windows can be offered for vessels going to the ice edge and for ice breakers. Both TX and RX ice windows are made of hyperlast, reinforced with titanium rods, proven to withstand surveys across the North Pole.

FULL SEABED COVERAGE

The transmit fan can be divided into 16 individual sectors in dual swath mode. This allows for unique control of the transmit fan, enabling active stabilization in real time to correct for any yaw and pitch movement of the vessel, while roll stabilization is applied on the receiving beams. The result is a stabilized system—full ensonification of the seabed with an equally distributed footprint in all types of weather conditions, leaving no gaps or holes in the mapped area.
All beams are maintained and automatically adjusted according to achievable coverage or operator defined limits. Up to 1600 individual beams are available in dual swath mode.
The two individual transmitting fans are generated with a small difference in tilt to provide a constant sounding separation along track, resulting in a dense sounding pattern on the seafloor.

CLEAN AND HIGH RESOLUTION DATA

Due to the sector transmission technique, the system produces a strong dampening of multi-bounce interference from false echo, resulting in significantly cleaner data. Near field beam focus is applied in real time, both during transmission and reception. Due to sector transmission, the focal point will be individual for each sector, resulting in a much sharper transmit beam over the entire swath. On reception, the focus is done dynamically for each beam. The result is a much higher resolution representation of the seabed.

THE KONGSBERG EM SYSTEMS

The EM 712 is part of the new EM platform designed for future challenges and uses the new KMALL datagram format. The format supports several new features, such as extended backscatter calibration, with more features in continuous development. The new platform is supported by Kognifai, KONGSBERG's open digital ecosystem, bringing opportunities to transform survey operations through digitalization.

Like all KONGSBERG EM multibeam echo sounders, the EM 712 ensures the best operating environment to safeguard marine life inhabiting the survey area through the option to decrease emitted sound levels.

EM 712 multibeam echo sounder versions

There are four basic versions of the EM 712 multibeam echo sounder, each with different range performances. The transmit and receive resolution can be selected based on which model will best fit the platform:

• EM 712 - Full performance version, 3-3600m
• EM712 USV – Full performance for Unmanned Surface Vehicles (USV), 3-3600m
• EM 712 S – CW pulse forms only, 3-1800m
• EM 712 RD – Short CW pulse only, 3-600m

Choice of Beamwidths

The transmit and receive beamwidth depends upon the chosen transducer configuration with 0.25°, 0.5°, 1° and 2° transmitter arrays and 0.5°, 1° and 2° receiver arrays available as standard.

At 100 m 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 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.

Features

• Modular design
• High resolution
• Wide frequency range
• FM chirp
• Roll, pitch, and yaw stabilization
• Transmit and receive nearfield focusing
• Water column display and logging
• Water column phase logging
• Seabed image
• Dual swath
• Extra detections
• Mammal protection

Realtime software

• Seafloor Information System (SIS)

Post processing software

• QPS Qimera - advanced multibeam bathymetry processing software
• QPS Fledermaus - 4D geo-spatial processing and analysis tool
• Eiva NaviSuite NaviEdit and NaviModel
• Teledyne CARIS HIPS/SIPS post processing
• Geocap Seafloor integrated with Neptune for digital terrain modelling

Note: KONGSBERG is not responsible for any system malfunction caused by 3rd party software.