Counter-UAS (C-UAS)
Also known as: C-UAS · Counter-drone · Counter-unmanned aircraft system
Counter-UAS (C-UAS) refers to the systems and procedures used to detect, track, identify and, where lawful, defeat unmanned aircraft that pose a threat to an airport or other protected site. Because drones evade traditional perimeter defences, C-UAS extends airport protection into the surrounding airspace.
Reviewed by AeroVigil Threat Intelligence Desk · 2026-05-31
C-UAS capabilities fall broadly into detection and mitigation. Detection and tracking use sensors such as radar, radio-frequency monitoring, electro-optical and acoustic systems to find a drone and, ideally, locate its operator. Mitigation — physically or electronically defeating the drone — is far more legally and operationally constrained near airports, since jamming, spoofing or kinetic effects can themselves endanger aircraft, disrupt navigation or violate the law. For this reason, detection and coordinated response often precede any active countermeasure.
Deploying C-UAS at a civil airport is a careful balance: the same techniques that neutralise a hostile drone can interfere with GNSS, communications and other aircraft. Effective programmes therefore combine technology with procedures — clear authority to act, coordination with air traffic control and law enforcement, and decision thresholds — rather than relying on a single device. Regulation of who may use mitigation, and how, varies considerably between jurisdictions.
C-UAS posture and incidents at a given airport are part of its security picture. Within an aviation security intelligence context, AeroVigil can relate reporting on drone activity and the surrounding threat environment to the airports and operations where counter-UAS considerations apply.
Frequently asked
- Why is defeating a drone near an airport so difficult?
- Many mitigation techniques — radio jamming, GNSS spoofing or kinetic interception — can themselves endanger crewed aircraft, disrupt navigation or be unlawful. Near airports, detection and coordinated response are emphasised, with active countermeasures tightly controlled.
- What does a counter-UAS system actually do?
- C-UAS systems detect and track unmanned aircraft using sensors such as radar, radio-frequency, optical and acoustic detection, help identify the drone and operator, and — where legally permitted — provide means to mitigate the threat.
Related terms
Sources
- ICAO — Unmanned Aircraft Systems (UAS) provisions
- ICAO Doc 8973 — Aviation Security Manual (restricted)