Question

Which of the following is false with respect to PESA?

(a) PESA can only have one main beam and one transmit power source

(b) All elements combine to a single receiver. Each element steers the beam through phase shifters

(c) Because it uses a, multiple frequencies, it is less susceptible to enemy jammers

(d) PESA is more technically simple

I have been asked this question at a job interview.

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

Answer 1

The correct option is (c) Because it uses a, multiple frequencies, it is less susceptible to enemy jammers

To explain I would say: In a PESA only one transmitter drives the whole antenna and hence only one frequency can be achieved at a time. This allows it to be more susceptible to jammers.