Question

What is the frequency designated to radar altimeters?

(a) 4.2 to 4.4 GHz

(b) 2.4 to 4.2 GHz

(c) 500 to 1 GHz

(d) 13 to 14 GHz

I got this question in an international level competition.

This key question is from Radar Altimeter topic in chapter Celestial Navigation, Doppler and Altimeter Radars of Avionics

Answer 1

The correct choice is (a) 4.2 to 4.4 GHz

The best explanation: The frequency band of 4.2 to 4.4 GHz is assigned to radar altimeters. This frequency band is high enough to result in a reasonable small sized antenna to produce 40° to 50° beam but significantly low so that attenuation by rain is minimum.