Figure 1: View of a PPI-screen
The PPI-scope shown in this figure, is by far the most used radar display. It is a polar coordinate
display of the area surrounding the radar platform. Own position 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. The sweep rotates on the display just as fast as the radar antenna.
This results in a map-like picture of the area covered by the radar beam. A long-persistence screen
is used so that the targets remain visible until the sweep passes again.
interactive block diagramm
Figure 3: Historical PPI-scope, manufactured by Telefunken AG in 1980