artisan TRACKPOINT 3 4211A, Operation And Maintenance Manual

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GLOSSARY OF TERMS
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Beacon sponse to an interrogation. The first reply is the navigation pulse for the
TrackPoint 3 and the second reply is the telemetry pulse. The time delay
between the two replies is proportional to the sensor output on the teleme-
try beacon.
Trackman ORE’s Windows based TrackPoint Interface Software. Communicates with
the TrackPoint Deck Units to allow modification of the target & system pa-
rameters and also outputting of processed data to Navigation packages.
TrackPoint 3 ORE Offshore’s Model 4450A USBL Tracking System. A high accuracy survey
quality acoustic navigation system.
Transponder An underwater sound source which responds to an underwater signal (de-
vice is interrogated acoustically) and returns with an underwater acoustic
reply. Sometimes abbreviated as "XPDR".
Turn Around
Time
A preset time delay, built into a transponder or responder, between when a
device is interrogated and when it replies. The delay is calibrated at the
xponder to compensate for variations in receiver propagation delays.
USBL Ultra Short BaseLine - A type of acoustic navigation system which utilizes an
array of receiving elements spaced very close together (within inches). (As
opposed to Long Baseline Systems)
VRU Vertical Reference Unit - Used to compensate for pitch and roll motion of the
ship.
X The port (-) to starboard (+) direction which the target is referenced to
(e.g., bow of vessel or north).
Y The aft (-) to bow (+) direction which the target is referenced to. (e.g., bow
of vessel or north)
Z The targets depth. Referenced from the plane of the hydrophone elements
or offset point to the target.