Differentiate barrage jamming from spot jamming in terms of spectral occupancy and impact.

• A. Barrage jamming floods a wide spectrum with noise; spot jamming targets a narrow frequency; barrage reduces overall SNR, spot hinders a particular channel.
• B. Barrage jams a narrow band; spot jams a wide band; both have the same impact.
• C. They are the same; no difference.
• D. Barrage is legal; spot is illegal.

Answer: (A)

The main idea is how much spectrum the jammer uses and what that means for interference. Barrage jamming places noise-like energy across a wide portion of the spectrum, so its spectral occupancy is broad. Because the energy is spread out, the interference raises the noise floor across many frequencies, leading to a general degradation of SNR over an extended band and potentially disrupting multiple channels.

Spot jamming, in contrast, concentrates energy into a very narrow frequency range around the target channel. That high spectral density overwhelms the desired signal in that specific channel, producing strong interference there while leaving most other frequencies—and thus other channels—largely unaffected.

So, barrage is wideband interference with broad spectral occupancy and widespread impact, whereas spot jamming is narrowband interference with focused impact on a single channel.