How does frequency agility help radar performance against jamming?

• A. Increasing transmitter power to overwhelm jamming.
• B. Changing operating frequencies to avoid jamming patterns and maintain target detection.
• C. Switching to a passive system that relies on other emitters for detection.
• D. Turning off the radar to avoid interference.

Answer: (B)

Frequency agility lets a radar rapidly change its operating frequency during a scan, breaking the link between its emissions and any fixed-band jamming. Jammers often target a specific frequency or a narrow band, so by hopping across frequencies the radar avoids being consistently jammed and can keep listening for returns on the frequencies it uses.

This approach forces the jammer to jam across a much wider spectrum or to guess the radar’s next hop, which degrades the jammer’s effectiveness and preserves the radar’s chances of detecting and tracking targets. In short, changing operating frequencies to dodge jammed channels maintains detection even under hostile interference.

Other options don’t address the same problem. Merely increasing transmitter power can help, but it doesn’t defeat targeted or adaptive jamming patterns. Switching to a passive system or turning the radar off avoids the issue instead of countering it.