An acronym for lan osition ndicator .

Plan Position Indicator. It is a radarscope over which the wave of an object reflecting radar shows its bearing and the distance from the radar detector by making a spot of light to appear on a screen that represents a map of the area around the detector.

Display on which radar signals are shown in plan position with range and azimuth angle displayed in polar coordinates, forming a map-like display.

lan osition ndicator The traditional type of CRT used in radar sets to present a display of the area around the antenna, showing the echoes from objects in their correct relative locations.

lan osition ndicator. A radar scanning method which uses a single elevation of the radar antenna to detect and range rainfall surrounding the site. Multiple PPI scans at various elevations are often combined to create a CAPPI (Constant Altitude Plan Position Indicator) display of the radar data. This is the most common type of radar display used in Australia.

lan osition ndicator. The sweep is a radius on the tube face (from the center to the rim of the tube), and the sweep moves around through 360 degrees. This type of presentation gives the azimuth of the target by the direction of the radial line, and range by the distance of the target's signal from the center point of the tube.