The modular, state-of-the-art EM 124 performs accurate, high resolution seabed mapping in shallow to full ocean depth. The successor to the EM 122, the EM 124's broad range of functionality
supports simultaneous collection of multiple data types, saving time in the planning, execution and analysis phase. A low noise echo sounder, EM 124 delivers superior data that requires minimal
Modular and flexible design
The EM 124 consist of new state-of-the-art electronics and separate transmit and receive transducers in a Mills Cross configuration. It utilizes the same field-proven transducers as the EM 122,
making it easy to upgrade. Care has been taken to design a highly, modular and flexible solution with compact electronics for easier and faster installation. Due to a flexible transducer design, the
system can be tailored to almost any required size. The largest standard size, 0.5 x 1 degrees, gives the ultimate system performance in terms of resolution and range, while a smaller 4 x 4 degrees
solution allowing full ocean depth surveys even on smaller vessels.
Full seabed coverage
The transmit fan is divided into up to 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 for full ensonification of the seabed with equally distributed
footprints, even in bad 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. Two individual transmitting fans are generated with a small difference in tilt giving a constant sounding separation alongtrack,
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 124 is part of the new EM platform designed for future challenges. The new datagram format supports several new features, such as extended backscatter calibration and more features will be
available going forward. The new format is supported by the KONGSBERG Kognifai digital open ecosystem.
All KONGSBERG EM multibeam echo sounders ensure the best operating environment to safeguard mammals inhabiting the survey area.