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
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Physical properties of transducer head
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Length [m]
1940
Width [m]
224
Height [m]
118
Min. external power [V]
115
Max. external power [V]
230
Weight in Air
98 Kg
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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
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Maintenance criteria
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Mean time before failure [hr]
2000
Mean time to repair [hr]
1
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Interfaces
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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
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Motion compensation
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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
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Mounting and deployment
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Mounting
Hull mounted & Portable
Retractable
Y
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Used Sonar Methods
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Type of system
Multibeam
Bottom Detection Method
Amplitude and Phase
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System Parameters
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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
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Bottom Coverage
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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
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Uncertainty
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RMS of nadir depth measurement [m]
0.06
Intended S44 order
Special
Max. survey speed for specified RMS [kt]
16
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More information
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Distinguishable features
High resolution soundings up to medium water depths
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General
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Date of first release
2015