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Which one of the following is common between AESA and PESA?

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Which one of the following is common between AESA and PESA?

(a) Number of transmitting modules

(b) Number of frequencies that can be used

(c) Power required by each transmitter

(d) Electronic scanning capability

I got this question during an interview.

The origin of the question is Electronic Scanned Array Radar topic in chapter Surveillance Systems, Mapping and Multimode Radars of Avionics

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Right option is (d) Electronic scanning capability

For explanation I would say: One of the basic common features between the AESA and PESA is that both provide electronic scanning. This allows the use of narrow beams since the rate of scanning is very high.

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