The plan position indicator (PPI) is possibly the
best known of all radar displays where the targets are
shown in a plan format. The display, therefore, resembles a
map with the radar site at the centre of the
display. Range is indicated by displacement from the centre of
the display and the radial displacement from the vertical represents
the targetís azimuth angle.
A variation on the plan position indicator is called the sector PPI where only the
relevant sector is shown on the display.
A sector plan
position indicator (sector PPI) is often employed by
radars with extremely high antenna scan rates but limited azimuth
coverage. An example of such a radar is a maritime
patrol radar that may employ a sector PPI display when
the radar switches from a 360o surveillance mode to concentrating
on a specific sector in which a periscope is detected.
Other topics in our resources on Radar related to Plan Position Indicator include: