Difference between revisions of "Plan Position Indicator"
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Plan Position Indicator
</dt>
1. A cathode-ray
indicator in which a signal appears on a radial line. Distance is
indicated radially and bearing as an angle.
</dd>
2. In radar technique, a cathode-ray indicator on which blips produced by
signals from reflecting objects and transponders
are shown in plan position, thus forming a maplike display. Also called
P-indicator, P-scan, P-scope.
</dd>
A north-upward plan position indicator has north at the top of the
indicator regardless of the heading; a heading-upward plan position indicator
has the heading of the craft maintained at the top of the indicator. On a
delayed plan position indicator the start of the sweep is delayed so that the
center represents a selected range. This allows distant targets to be
displayed on a short range scale, thus providing larger scale presentation. An
open-center plan position indicator has no signal displayed within a set
distance from the center. An off-center plan position indicator is one
modified so that the center about which the trace rotates can be moved from
the center of the screen to provide a larger scale for distant targets. A
master plan position indicator controls remote indicators or repeaters. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
