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The dipole antenna of a radar altimeter of 1947. A radar altimeter (RA), also called a radio altimeter (RALT), electronic altimeter, reflection altimeter, or low-range radio altimeter (LRRA), measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to travel to ground, reflect, and return to the craft.
AN/APQ-157 AN/APQ-153 radar with dual line-replaceable units (with the exception of the radar antenna) for the twin seater versions of Northrop F-5; AN/APQ-158 for the MH-53 Pave Low helicopter; AN/APQ-159 improved AN/APQ-153 fire control radar by Emerson Electric Company for Northrop F-5; AN/APQ-160 attack radar for EF-111A Raven
The system monitors an aircraft's height above ground as determined by a radar altimeter. A computer then keeps track of these readings, calculates trends, and will warn the flight crew with visual and audio messages if the aircraft is in certain defined flying configurations ("modes"). The modes are:
Tactical information display (TID) of radar data in the rear seat of an F-14A. The radar antenna of an AN/AWG-9 on display in the USS Hornet Museum. The AN/AWG-9 and AN/APG-71 radars are all-weather, multi-mode X band pulse-Doppler radar systems used in the F-14 Tomcat, and also tested on TA-3B. [1]
Honeywell Aerospace Technologies (subsidiary of Honeywell) AN/APN-203: High range radar altimeter: AN/APN-215 ... Trailer mounted 30-foot mast antenna instrument ...
The air traffic control radar beacon system (ATCRBS) is a system used in air traffic control (ATC) to enhance surveillance radar monitoring and separation of air traffic. It consists of a rotating ground antenna and transponders in aircraft. The ground antenna sweeps a narrow vertical beam of microwaves around the airspace. When the beam ...
Consider the following example : if the radar antenna is located at around 15 m above sea level, then the distance to the horizon is pretty close, (perhaps 15 km). Ground targets further than this range cannot be detected, so the PRF can be quite high; a radar with a PRF of 7.5 kHz will return ambiguous echoes from targets at about 20 km, or ...
In modern aircraft, a wide variety of antennas are needed for essential functions like navigation, communication systems, instrument landing, and radar altimeter. These antennas, often numbering between 20 and 70 on military aircraft, significantly increase aerodynamic drag and fuel consumption [[2]].