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Which of the following cause multi path signals?

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Which of the following cause multi path signals?

(a) Low transmission power

(b) Ground reflection

(c) Low frequency transmission

(d) High frequency transmission

This question was posed to me in homework.

My question is based upon Instrument Landing Systems topic in portion Landing Systems & Air-Traffic Management of Avionics

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The correct option is (b) Ground reflection

The explanation is: Mulit path Signals are created when a part of the original signal take a different path than LOS to reach the receiver. Thus a signal with same information reaches the receiver at multiple times. Multi path signals are created when the actual signal gets reflected from the ground and reaches the receiver.

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