Radar
Videos
Radar is a system that uses radio waves to determine the distance, direction, and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track aircraft,
Long-range radar antenna, used to track space objects and ballistic missiles.
Radar of the type used for detection of aircraft. It rotates steadily, sweeping the airspace with a narrow beam.
Experimental radar antenna, US Naval Research Laboratory, Anacostia, D. C., from the late 1930s (photo taken in 1945)
The first workable unit built by Robert Watson-Watt and his team
Pulse-Doppler radar
Videos
A pulse-Doppler radar is a radar system that determines the range to a target using pulse-timing techniques, and uses the Doppler effect of the returned signal to determine the target object's velocit
Radar
…the received power from distant targets is relatively very small. Additional filtering and pulse integration modifies the radar equation slightly for pulse-Doppler radar performance, which can be used to increase detection range and reduce transmit power. The equation above with F = 1 is a simplification for transmission in a vacuum…
Airborne pulse-Doppler radar antenna