EM 122
MULTIBEAM ECHO SOUNDER
EM 122 full ocean depths capability has been replaced by EM 124
Description
EM 122 multibeam echosounder is a high performance echosounder for deep water mapping with up to 288 simultaneous beams.
It has been replaced by EM 124 system with full ocean depth capability.
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Specifications
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Physical properties of transducer head
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Length [m]
0.18
Width [m]
0.76
Height [m]
0.2
Min. external power [V]
115
Max. external power [V]
230
Max. power consumption [W]
2000
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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
Using Schnell\\\\\\\'s law refraction, in real time
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Interfaces
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Compatible software
SIS, Hypack, QINSY, EIVA, CARIS and others
Compatible hardware
Integrates with SBP 120 and TOPAS. Sound velocity at transducer; Sound Velocity profile; Position; Heading; 1PPS; Single beam echo sounder (optional).
Real-time access procedure
Acquisition software; Gigabit Ethernet
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Motion compensation
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Motion sensors compatible to the system
Seatex MRU5; Seapath 300; Applanix POS/MV & others
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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Retractable
N
Mounting
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Used Sonar Methods
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Type of system
Multibeam echosounder
Bottom Detection Method
Amplitude and phase
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System Parameters
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Min. frequency [kHz]
10
Max. frequency [kHz]
13
Min. depth [m]
20
Max. depth [m]
11000
Depth resolution [mm]
20
Max. swath as a function of depth
6
Max. pings / second
864
Ping frequency [Hz]
5
Min. beam width across track [deg]
0.5
Min. beam width along track [deg]
1
Number of selectable frequencies
1
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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
Max. swath width [m]
35000
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]
0.5
Intended S44 order
1
Max. survey speed for specified RMS [kt]
20
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More information
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Distinguishable features
Dual and triple frequency. Mammal protection
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General
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Date of first release
2005
Documents
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Discovering the redefined EM multibeam series (2)729.72 KB
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Mounting of EM 122 and SBP 120 transducers - Oden icebreaker414.29 KB