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Which of the following errors are not rectified by LDGPS?

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Which of the following errors are not rectified by LDGPS?

(a) Satellite ephemerides

(b) Ionosphere propagation effects

(c) Multi-path signal interference

(d) Clock offset

I had been asked this question by my school principal while I was bunking the class.

My question is from Satellite Landing System topic in chapter Landing Systems & Air-Traffic Management of Avionics

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Correct choice is (c) Multi-path signal interference

The best explanation: LDGPS operation leads to the nearly complete cancellation of errors due to satellite ephemerides, clock offset, selective availability, and ionospheric propagation, leaving mainly those errors due to multipath signal interference and receiver noise.

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