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Which effect degrades radar system performance when atmospheric coherence is reduced?

A)Increased signal phase decorrelation
B)Elevated amplifier thermal noise
C)Decreased antenna effective aperture
D)Enhanced spurious harmonic generation

💡 Explanation

Increased signal phase decorrelation degrades radar because reduced atmospheric coherence allows varying refractive indices and path lengths of propagation. This introduces phase variations and distorts the received signal, therefore, producing signal decorrelation, rather than changes to noise temperature.

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