Glossary
Radar/Chart Radar User Guide
Glossary-10
65900010
PM:
Performance Monitor
Polar Stereographic:
Chart projection used to display any region of the
earth, including the north and south poles (up to 90 degrees north
or south).
POS:
Position
PPI:
Plan Position Indicator
PRF:
Pulse Repetition Frequency – the number of radar pulses
transmitted each second. The pulse transmission rate is
automatically lengthened for longer ranges.
Product types:
A small set of defined products, any one of which the
VisionMaster application can function as. Product types apply to
individual nodes.
Proximity Limit:
The proximity limit defines the safety breadth from own
ship's path that the system checks for dangerous objects.
PSU:
Power Supply Unit
R
RADAR:
Radio Detection and Ranging
RAIM:
Receiver Autonomous Integrity Monitoring
RAM:
Random Access Memory. Memory used in computer systems.
RAM is volatile memory, which does not hold data when the power
is turned off.
Range Rings:
A set of concentric circles labelled by distance from the
central point, useful for judging distance (especially from own ship).
Relative Motion – Relative Trails:
Own ship is shown at a fixed point on
the display (normally the centre). All target trails are shown relative
to own ship’s movement. This means stationary targets will have
trails if own ship is moving.
Relative Motion – True Trails:
Own ship is shown at a fixed point on the
display (usually the centre). Target trails show their direction.
Stationary targets do not produce trails
RF:
Radio Frequency
Summary of Contents for VisionMaster FT
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