What is Pulse Doppler used to determine?

Pulse Doppler radar is specifically designed to measure the velocity of a target using the Doppler effect. In pulse Doppler radar systems, transmitted pulses of radio waves bounce off moving targets and reflect back to the radar receiver. By analyzing the frequency shift of the returned signal due to the motion of the target, the radar can accurately calculate its speed. This technique is particularly valuable in various applications such as air traffic control, military surveillance, and weather monitoring, where understanding a target's velocity is crucial for tracking and assessing its movement.

The other options do not align with the primary capability of Pulse Doppler radar. While a radar system can also provide information on a target's location and direction, these aspects are generally derived from different radar functions or additional processing techniques rather than being the main focus of Pulse Doppler technology. The target's size may be assessed using other radar characteristics, but this is not a key capability of Pulse Doppler radar specifically. Thus, understanding the capabilities of Pulse Doppler clearly highlights that its main utility lies in determining the velocity of moving targets.