What type of radar indicator uses a polar coordinate display?

A radar indicator that uses a polar coordinate display is known as a PPI, or Plan Position Indicator. This type of display presents information on a circular screen where ranges are measured radially from a central point, which typically represents the radar installation location. The angle around the circle represents the azimuth, or the direction from which the radar signals are being received, allowing operators to visualize the location and movement of targets in relation to the radar system.

The polar coordinate format of the PPI is advantageous because it provides an intuitive understanding of target positions and distances from the radar. This makes it particularly useful in military applications, where quick decision-making is essential. The PPI display allows operators to track multiple targets simultaneously, facilitating situational awareness and threat assessment in dynamic environments.