What is the scan rate in radar terminology?

• A. The time required for the antenna to complete one cycle.
• B. The frequency of the radar signal.
• C. The rate at which targets are scanned by the radar display.
• D. The maximum range of the radar.

Answer: (A)

Scan rate is about how quickly the radar’s antenna beam sweeps across the field of view. It corresponds to the time it takes for the antenna to complete one full sweep or cycle. A faster scan means more frequent updates of the area, which is why the scan rate is tied to the sweep period (the reciprocal of the cycles per second, often expressed as rpm for rotating antennas).

So the best description is the time required for the antenna to complete one cycle. The other ideas refer to different radar characteristics: the carrier frequency is the signal’s frequency, not how fast you sweep; the rate targets appear on the display is about update/refresh rate, not the sweep itself; and maximum range is just how far the radar can detect.