Kongsberg EM 2040P shallow water multibeam echo sounder

The EM 2040P is a shallow water multibeam echo sounder based

on the EM 2040 technology, an ideal tool for any high resolution

mapping and inspection application.

The receiver and transmitter are integrated in a common sonar

head. The system fulfils, and even surpasses, the IHO-S44 special

order and the more stringent LINZ specification.

Key facts

The operating frequency range is from 200 to 400 kHz. The

operator can 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 up to 60 kHz. The system can

effectively operate with very short pulse lengths. The 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 in cold ocean water is 600 m at 200

kHz with a swath with up to 830 m.

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.

Components

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 of the

transducer to protect the it if it is placed on deck, and it has

carrying handles on the sides.

The EM 2040P can be delivered with the standard processing

unit or with a splash proof (24 VDC) portable processing 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 transducer and the bottom.

Sound speed at the transducer depth is an optional input.

Optionally, the sonar head can 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.

FEATURES

• High resolution

• Wide frequency range

• FM chirp

• Roll, pitch and yaw stabilisation

• Nearfield focusing - both on transmit and receive

• Short pulse lengths, large bandwidth

• Water column display

• Seabed image

• Depth rated to 30 m

• Easy to install

Options:

• Water column logging

• Extra detections

• Dual swath