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EM 712

EM 712

MULTIBEAM ECHO SOUNDER

The EM 712 multibeam echo sounder is Kongsberg Maritime's second generation high to very high resolution seabed mapping system capable of meeting all relevant survey standards. Delivering highly accurate results through superior range and resolution, the EM 712 is the most advanced multibeam echo sounder for shallow-medium waters. It supersedes the EM 710, which is well established as the de facto standard for all shallow to medium depth surveys.

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

• Hull unit

• Reinforced transducers for polar activities

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Specifications

Physical properties of transducer head

Length [m]

1940

Width [m]

224

Height [m]

118

Min. external power [V]

115

Max. external power [V]

230

Weight in Air

98 Kg

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; 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 & Portable

Retractable

Y

Used Sonar Methods

Type of system

Multibeam

Bottom Detection Method

Amplitude and Phase

System Parameters

Min. frequency [kHz]

40

Max. frequency [kHz]

100

Min. depth [m]

3

Max. depth [m]

3600

Depth resolution [mm]

10

Max. swath as a function of depth

5.5

Max. pings / second

1600

Ping frequency [Hz]

30

Min. beam width along track [deg]

0.5

Min. beam width across track [deg]

0.25

Bottom Coverage

Footprint in nadir direction [m]

0.4

Footprint at max. horizontal range [m]

1.3

Smallest identifiable cube [m3]

1

Max. swath width [m]

4200

Equal footprint spacing

Y

Max. number of points per ping for side scan operation

100000

Uncertainty

RMS of nadir depth measurement [m]

0.06

Intended S44 order

Special

Max. survey speed for specified RMS [kt]

16

More information

Distinguishable features

High resolution soundings up to medium water depths

General

Date of first release

2015

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