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What is the type of polarization is used in ILS systems?

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What is the type of polarization is used in ILS systems?

(a) Horizontal polarization

(b) Vertical polarization

(c) Circular polarization

(d) No polarization

I have been asked this question during an online interview.

This interesting question is from Instrument Landing Systems in section Landing Systems & Air-Traffic Management of Avionics

1 Answer

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Correct answer is (a) Horizontal polarization

To explain I would say: Every transmitter in the ILS including the glide slope transmitter, localizer and the marker beacons radiate continuous wave, horizontally polarized, radio frequency energy which can be received by the on-board receiver.

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