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EM 124

EM 124

MULTIBEAM ECHO SOUNDER

The modular, state-of-the-art EM 124 performs accurate, high resolution seabed mapping up to full ocean depths. The successor of 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 with full ocean depth capability delivers superior data requiring minimal post-processing.

Description

FEATURES:

• High resolution

• Wide frequency range

• CW and FM chirp

• Roll, pitch and yaw stabilisation in realtime

• Nearfield focusing - both on transmit and receive

• Short pulse lengths and large bandwidth

• Seabed image as standard

• Water column display and logging

• Single or Dual swath for increased density or for increased survey speed

• Extra detections

• Mammal protection

• Hull unit

• Ice window for polar activities

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Specifications

Physical properties of transducer head

Length [m]

7.77

Width [m]

0.78

Height [m]

0.25

Min. external power [V]

115

Max. external power [V]

230

Speed of sound

Real-time correction of refraction at transducer head

Y

Real-time integration of SV-profile

Y

Explanation of SV-profile application process

Calculation of each sounding is according to Schnells law of refraction, in real time

Maintenance criteria

Mean time before failure [hr]

2000

Mean time to repair [hr]

1

Interfaces

Compatible software

SIS, Qinsy, HYPACK, EIVA, Fledermaus, CARIS and others.

Compatible hardware

Sound velocity at transducer; Sound Velocity profile; Position; Heading; 1PPS; Single beam echo sounder (optional)

Real-time access procedure

Realtime visualization of bathymetric data; both raw data and gridded data in 2D and 3D; swath; quality of each beam; water column; seabed image; attitude data; 3D waterfall

Motion compensation

Motion sensors compatible to the system

Seatex MRU 5; Seapath 130/380; Applanix POS/MV; and other sensors with comparable accuracy

Required pitch uncertainty [deg]

0.02

Required roll uncertainty [deg]

0.02

Required heave uncertainty [m]

0.05

Mounting and deployment

Mounting

Hull mounted

Retractable

N

Used Sonar Methods

Type of system

Multibeam

Bottom Detection Method

Amplitude or phase

System Parameters

Min. frequency [kHz]

10.5

Max. frequency [kHz]

13.5

Min. depth [m]

20

Max. depth [m]

11000

Depth resolution [mm]

10

Max. swath as a function of depth

6

Max. pings / second

1600

Ping frequency [Hz]

5

Min. beam width across track [deg]

0.5

Min. beam width along track [deg]

1

Bottom Coverage

Footprint in nadir direction [m]

0.87

Footprint at max. horizontal range [m]

2.82

Smallest identifiable cube [m3]

2

Max. swath width [m]

40000

Equal footprint spacing

Y

Max. number of points per ping for side scan operation

100000

Uncertainty

Intended S44 order

2

Max. survey speed for specified RMS [kt]

16

More information

Distinguishable features

High resolution soundings with extremely wide swath up to full ocean depths

General

Date of first release

2019

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