PESA is defined as which?

PESA is defined as which?

• A. Passive Electronically Scanned Array: 1 Large, high powered transmitter with phase shifters to automatically shift/move the radar scan
• B. Passive Electronically Scanned Assembly: A network of small transmitters
• C. Passive Echo Scanning Array: A mechanical rotation system
• D. Passive Emission Scanned Antenna: A passive array

Answer: (A)

Beam steering in radar arrays is achieved by electronically adjusting the phase of signals across the antenna elements. PESA stands for Passive Electronically Scanned Array. In this setup, there is one high‑power transmitter feeding the whole array, and phase shifters distributed across the feed network change the relative phase so the beam can be steered to the desired direction without any moving parts. The term “passive” means the array itself doesn’t include individual transmitters at each element; the steering comes from the single transmitter driving the array. This differs from active electronically scanned arrays, where each element has its own transmitter/receiver module, enabling multiple beams and more power distribution across the array. The other options use terms or configurations that don’t match the PESA concept—such as a network of small transmitters, a mechanically rotated system, or an unconventional term like echo or emission—so they don’t describe the same architecture.

Beam steering in radar arrays is achieved by electronically adjusting the phase of signals across the antenna elements. PESA stands for Passive Electronically Scanned Array. In this setup, there is one high‑power transmitter feeding the whole array, and phase shifters distributed across the feed network change the relative phase so the beam can be steered to the desired direction without any moving parts. The term “passive” means the array itself doesn’t include individual transmitters at each element; the steering comes from the single transmitter driving the array.

This differs from active electronically scanned arrays, where each element has its own transmitter/receiver module, enabling multiple beams and more power distribution across the array. The other options use terms or configurations that don’t match the PESA concept—such as a network of small transmitters, a mechanically rotated system, or an unconventional term like echo or emission—so they don’t describe the same architecture.