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What is the nominal accuracy of radar altimeters below 100ft?(a) 5 ft(b) 10 ft(c) 20 ft(d) 1.5 ftI had been asked this question in an online interview.My doubt stems from Automatic Landing Systems topic in division Landing Systems & Air-Traffic Management of Avionics

Answer»

Correct answer is (d) 1.5 ft

For explanation I would say: Low range radar altimeters have a nominal accuracy of 1.5 ft below 100ft altitude and 2% of full scale at HIGHER altitude. They have a low noise OUTPUT that allows the DERIVATION of vertical RATE INFORMATION.



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