Glossary - Marine Sea Scan Manual

34 Sea Scan® Survey Software Manual
5

Glossary

absorption
acoustic shadow
acoustic signal
active SONAR
angle of incidence
ARC
AUV
axial layback
backscatter
baud rate
beam spreading
BMP
Bow
buffer
CD
channel
COG
The diminishment of the returning pulse caused
by the impact of the acoustic signal against
objects, materials, or the sea bottom
Literally, the shadow an object on the bottom
casts to its side in relation to the transducer; the
transducer must "see" this entire shadow so that
the height of that object can be calculated
The fan of sound emitted from the transducer
A system that transmits an acoustic signal
through the water that reflects off objects, then
is returned
The angle at which a straight-line SONAR pulse
hits an object
Adaptive Resolution CHIRP
Autonomous Underwater Vehicle
The offset distance from the position of the
towfish to the navigation antenna
Reverberation caused generally by sea
conditions, bottom roughness, and angle of
incidence
A unit for measuring data transmission speed,
where one unit equals 1 bit per second
The widening angle of a SONAR beam as it
moves farther from the transmitter
Bitmap, a graphic file format commonly used in
Microsoft Windows© applications
The front section of a boat or other vessel
To load, as in loading a file. Also, pulling
information from a file and putting it into
memory
compact disk
Another term used to describe the transducer
track from either side of the towfish that appears
in the SONAR window. The left channel refers to
the left (port) transducer track; the right channel
refers to the (starboard) track.
Course Over Ground; also known as Course
Made Good
© 2013 Marine Sonic Technology, Ltd.