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What is the function leading edge range tracker servo loop?

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What is the function leading edge range tracker servo loop?

(a) Provide range to the nearest return

(b) Speed measurements

(c) Vertical speed measurement

(d) Automatic ground navigation

I got this question during an interview for a job.

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

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Correct answer is (a) Provide range to the nearest return

Easiest explanation: To provide a range to the nearest return within the bounds of the antenna beam, many modern radar altimeters incorporate the gate in a pulse modulated radar or a filter in a frequency modulated radar over the leading edge of the return.

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