EM 2040P Portable Multibeam Sonar

The EM 2040P is a shallow water multibeam echo sounder based on the Kongsberg EM 2040 technology. It is highly portable, and has been designed for easy transport and quick deployment on any vessel, while offering survey performance up to and exceeding the IHO-S44 special order and the more stringent LINZ specification.

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The operating frequency range of the EM2040P is from 200 to 400 kHz. The operator can thus on the fly choose the best operating frequency for the application: 300 kHz for near bottom, 200 kHz for deeper waters, and 400 kHz for very high resolution inspection. Due to the very large operating bandwidth available the system will have an output sample rate of more than 60 kHz. The system will thus effectively operate with very short pulse lengths, shortest pulse is 14 microseconds, which gives a raw range resolution (cτ/2) of 10.5 mm.

By utilizing both CW and FM chirp pulses, the system can achieve a much longer range capability with a high resolution. The maximum depth range is 550 m at 200 kHz with a swath with up to 760 m.

Main Components

• The angular coverage for the 200 and 300 kHz is 140 degrees, allowing coverage of 5.5 times water depth.
• For the 400 kHz mode the angular coverage is 120 degrees.
• As an option the EM 2040P can be delivered with the dual swath capability, allowing a sufficient sounding density along track at a high vessel speed.
• The EM 2040P has a depth rating of 30m.

The basic EM 2040P has three units: A sonar head, a processing unit and a workstation. The sonar head has bumpers in the corners of the face to protect the transducer if it is placed on deck, and it has carrying handles in the sides. The EM 2040P can be delivered with a splash proof prosessing unit.

For completeness, data input from a motion sensor and a positioning system is required, as is the sound speed profile of the water column between the transducers and the bottom. Sound speed at the transducer depth is an optional input.

Optionally, the sonar head may be delivered with mounts for motion sensor and sound speed sensor, factory aligned for ease of mounting.

All electronics are contained in the sonar head which is interfaced to the processing unit via GBit Ethernet. The processing unit also supplies 48 V power via the same cable. Operator control, data quality inspection and data storage is handled by the hydrographic workstation running SIS software or by 3rd party software.