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What is the fundamental limitation of the radar that is overcome by Electronic scanned array radars?

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What is the fundamental limitation of the radar that is overcome by Electronic scanned array radars?

(a) More clarity

(b) Situation awareness

(c) Better range

(d) Less noise

This question was addressed to me in class test.

Question is from Electronic Scanned Array Radar topic in portion Surveillance Systems, Mapping and Multimode Radars of Avionics

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The correct answer is (b) Situation awareness

The explanation is: The fundamental limitation in military radars is situation awareness. This limitation is overcome by the electronically scanned array which has a very high rate of scanning.

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