Which indication type plots data on the radar display in polar coordinates?

Which indication type plots data on the radar display in polar coordinates?

• A. Plan Position Indicator (PPI)
• B. A-scan
• C. Raster
• D. C-scan

Answer: (A)

The key idea is how radar data are mapped to the screen: a Plan Position Indicator uses polar coordinates, with range shown as distance from the center and bearing shown as angle around the circle. As the antenna rotates, echoes are plotted at the corresponding radial distance and angular position, creating a circular, plan-view map of what’s at every bearing and range from the radar. This is different from other displays. An A-scan plots echo amplitude versus range on a single vertical line, not around a circle. A raster display builds a rectangular image by scanning lines, without showing angular direction in polar form. A C-scan projects data onto a plane in Cartesian coordinates, using x and y rather than a radial/angular layout.

The key idea is how radar data are mapped to the screen: a Plan Position Indicator uses polar coordinates, with range shown as distance from the center and bearing shown as angle around the circle. As the antenna rotates, echoes are plotted at the corresponding radial distance and angular position, creating a circular, plan-view map of what’s at every bearing and range from the radar.

This is different from other displays. An A-scan plots echo amplitude versus range on a single vertical line, not around a circle. A raster display builds a rectangular image by scanning lines, without showing angular direction in polar form. A C-scan projects data onto a plane in Cartesian coordinates, using x and y rather than a radial/angular layout.