Kongsberg EM 710
2 EM 710
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2.1 System overview
Key facts
The EM 710 multibeam echo sounder is a high to very high
resolution seabed mapping system capable of meeting all relevant
survey standards. The system configuration can be tailored to the
user requirements, allowing for choice of beamwidths as well as
transmission modes. The minimum acquisition depth is from less
than 3 m below its transducers, and the maximum acquisition
depth is up to 2000 m.
Acrosstrack coverage (swath width) is up to 5.5 times water
depth to a maximum of more than 2000 m. The sounding density
is very high, allowing even the very demanding LINZ special
order survey specification for object detection to be met in full.
There are three basic versions of the EM 710:
• EM 710 - Full performance version.
• EM 710S - CW pulse forms only.
• EM 710RD - Short CW pulse only.
The reduced performance versions EM 710S and EM 710RD are
upgradable to full performance.
Innovative acoustic principles
The EM 710 operates at sonar frequencies in the 70 to 100 kHz
range. The transmit fan is divided into three sectors to maximize
range capability but also to suppress interference from multiples
of strong bottom echoes. The sectors are transmitted sequentially
within each ping, and uses distinct frequencies or waveforms.
Both CW pulses of different lengths and even longer,
compressible waveforms (chirps) are utilized. The alongtrack
beamwidth depends upon the chosen transducer configuration
with 0.5, 1 and 2 degrees available as standard. Focusing is
applied individually to each transmit sector to retain the angular
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Страница 155: ...EM 710 Multibeam echo sounder Installation manual EM 710 Multibeam echo sounder Maintenance manual ...