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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 GHzI 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»

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.



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