Spectrum monitoring is the continuous observation of radio-frequency activity to detect interference, unusual emissions, or other signals that could disrupt wireless communications. It is used with radios, navigation aids, satellite links, and other systems that depend on clean spectrum to function reliably.
In cyber security, spectrum monitoring matters because many critical services are not protected only by software controls. Attackers can jam, spoof, or otherwise disturb RF channels, while defenders use monitoring to spot anomalies early, distinguish accidental noise from hostile activity, and confirm that controls are working. In practice, monitoring tools help operators identify weak signals, crowded bands, and unexpected transmitters before they become safety or availability problems.