Radio detection and ranging (RADAR) is a method of using electromagnetic waves to determine the position of a target. Radar transmits a signal and receives and detects a portion of the signal that is reflected back to the radar. Radar uses this return signal or echo to measure the time it is transmitted to the time it is received to determine the range of the target. In addition, the returned signal can be received by the radar antenna to determine the angle it received. Therefore, radar can determine the range and direction, velocity, and identifying characteristics of targets by monitoring the reflected signals coming back to the radar.