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2024年12月29日发(作者：自学c语言基础教程)
122
12 KHZ MULTIBEAM ECHO SOUNDER
The EM 122 multibeam echo sounder is designed to perform seabed mapping – bathymetry and seabed
imagery – to full ocean depth with an unsurpassed resolution, coverage and accuracy.
Beam focusing is applied both during reception and
transmission. EM 122 is equipped with a function to reduce the
transmission power in order to avoid hurting mammals if they
are close by.
The system has up to 432 soundings per swath with pointing
angles automatically adjusted according to achievable coverage
or operator defined limits.
With dual swath (two swaths per ping) the transmit fan is
duplicated and transmitted with a small difference in alongtrack
tilt. The applied tilt takes into account depth, coverage and
vessel speed to give a constant sounding separation alongtrack.
In dual swath mode, 2 swaths are generated per ping cycle,
with up to 864 soundings. The beam spacing is equidistant or
equiangular.
EM 122 uses both CW and FM pulse forms. FM sweep with
pulse compression on reception is used to increase the
maximum useful swath width. The FM pulses will also increase
the resolution compared to CW pulses of the same length.
The transmit fan is split in several individual sectors with
independent active steering. This allows stabilization which
compensates for the vessel movements: yaw, pitch and roll.
Each transmit sector has individual beam focusing.
The EM 122 transducers are modular linear arrays in a Mills
cross configuration with separate units for transmit and receive.
The transmitter array is available as 0.5, 1, 2, or 4 degree
resolution, while the receive array is available as 1, 2, or 4
degrees.
The receive transducer is wideband. In conjunction with a
separate low frequency transmit transducer, the EM 122 may
optionally be able to deliver sub-bottom profiling capabilities
with a very narrow beamwidth. This system is known as the
SBP 120 sub-bottom profiler.
FEATURES
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Depth range from 20 to 11000 m
Swath width up to 6 times water depth/30 km
Focused beams for transmission and reception
High density and multiping modes for increased resolution
Up to 864 sounings per ping
Yaw, pitch and roll compensation and stabilisation
High accuracy
Seabed image (sidescan) data display and recording
Water column data display and recording
Modular design, beamwidths 0.5 to 4 degrees
Integrated sub-bottom profiler available
Mammal protection
Compliant to IHO S-44 order 1A
TECHNICAL SPECIFICATIONS
EM 122 performance data
Operating frequency
Depth range
Swath width
Pulse forms
Swath profiles per ping
Motion compensation:
• Yaw
• Pitch
• Roll
Sounding pattern
Range sampling rate
High resolution mode
Sidelobe suppression
Effective pulse length
12 kHz
20-11000 m
6xdepth, to more than 30 km
CW and FM chirp
2
± 10 degrees
± 10 degrees
± 15 degrees
Equidistant / equiangular
3.03 kHz (25 cm)
High density processing
> 25 dB
1 ms CW to 100 ms FM
Suppression of sounding
artefacts
Beam focusing
Beamforming method
Gain control
Swath width control
8 frequency coded transmit
sectors per swath
On transmit and receive
Time delay
Automatic
Manual or automatic, all
soundings intact when
reduced swath width
Standard
Standard
Standard
Yes, by integration with
SBP 120 or Topas
Seabed imagery/sidescan
sonar image
Water column display
Mammal protection
Sub-bottom profiling
Versions of EM 122
System version (TX/RX):
Max no of soundings/swath
Max no of swaths per ping
Max no of soundings/ping
0.5 x 1
432
2
864
1 x 1
432
2
864
1 x 2
432
2
864
2 x 2
432
2
864
2 x 4
216
2
432
2 x 4
216
2
432
3
0
6
1
0
5
/
C
F
e
b
r
u
a
r
y
2
0
1
7
Laptop, HWS and monitor can be delivered on request.
Specifications subject to change without any further notice.
EM
®
is a registered trademark of Kongsberg Maritime AS in Norway and other countries.
E-mailsales:*********************.com
E-mailsupport:************************
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