3-4
Q1.
What are the three fundamental quantities involved in radar displays?
Q2.
What are the required radar inputs for proper indicator operation?
Q3.
What coordinates are displayed on an rhi scope?
PLAN POSITION INDICATOR (PPI).
The ppi scope shown in figure 3-3, is by far the most used radar display. It is a polar coordinate
display of the area surrounding the radar platform. Own ship is represented as the origin of the sweep,
which is normally located in the center of the scope, but may be offset from the center on some sets. The
ppi uses a radial sweep pivoting about the center of the presentation. This results in a map-like picture of
the area covered by the radar beam. A long-persistence screen is used so that the display remains visible
until the sweep passes again.
