As drones become more accessible and widely used, airspace users and asset owners increasingly need to understand what is flying around them. This has driven rapid growth in drone detection systems, often grouped under the broader term Counter-UAS. Yet many discussions blur important distinctions: detection versus mitigation, detection versus classification, and tactical versus strategic use.

This blog unpacks the main types of drone detection systems, explains where each works best, and highlights their strengths and limitations.

Detection Versus Mitigation: A Critical Distinction

Before diving into technologies, it’s important to separate two fundamentally different capabilities.

Drone detection systems aim to identify that a drone is present, determine where it is, and ideally understand what type of drone it is. These systems provide awareness and support decision-making.

Drone mitigation systems actively interfere with a drone, for example through jamming, takeover, or kinetic means. These actions are typically heavily restricted or reserved for state authorities due to safety, legal, and liability concerns.

Most organisations, including critical infrastructure operators and public agencies, are focused first and foremost on detection and situational awareness. Without reliable detection and classification, mitigation is either impossible or unsafe.

Detection Versus Classification

Detection alone answers the question: is there something flying here?

Classification answers a more nuanced question: what is it?

A robust system ideally supports both:

• Detection identifies an object or signal that could be a drone
• Classification determines whether it is a drone, which type, and whether it is likely compliant or non-cooperative

Not all technologies support both equally, which is one of the key trade-offs discussed below.

Radar-Based Drone Detection

Radar systems detect objects by emitting radio waves and analysing reflections. They are widely used in traditional aviation and have been adapted for low-altitude drone detection.

Radar is particularly effective for:

• Wide-area surveillance
• Detecting drones regardless of RF emissions
• Operations in darkness or poor visibility

However, radar systems face challenges at low altitude. Small drones have a limited radar cross-section, making them harder to distinguish from birds, vehicles, or clutter. As a result, radar often provides strong detection capability, but limited classification without support from other sensors.

Radar is most suitable for:

• Airports and large industrial sites
• Border and coastal surveillance
• Areas where long-range early warning is required

RF-Based Drone Detection

RF detection systems monitor the radio spectrum for signals between drones and their controllers. When a drone communicates using known protocols, RF sensors can often identify:

• The presence of a drone
• Its manufacturer or model family
• Sometimes the position of the drone and pilot

RF detection excels at classification for commercially available drones using standard control links. It is passive, meaning it does not emit signals itself, which is advantageous in sensitive environments.

Its limitations become apparent when:

• Drones fly autonomously without an active control link
• Encrypted or non-standard frequencies are used
• Signal reflections or urban interference reduce accuracy

RF systems are well suited for:

• Urban environments
• Security perimeters
• Monitoring compliance around restricted zones

Electro-Optical and Infrared Systems

Visual detection uses cameras, often combined with AI-based image recognition, to spot drones directly.

Electro-optical cameras operate in visible light, while infrared systems detect heat signatures. Together, they can:

• Visually confirm the presence of a drone
• Support classification and tracking
• Provide evidential imagery

These systems perform best when they are cuing systems, meaning they are directed to a specific area by another sensor such as radar or RF. On their own, wide-area scanning is difficult and computationally expensive.

Their main constraints are:

• Weather and lighting conditions
• Line-of-sight requirements
• Limited range compared to radar

Visual systems are most effective for:

• Perimeter security
• Critical infrastructure protection
• Situational confirmation after initial detection

Acoustic Drone Detection

Acoustic systems identify drones based on their sound signature. They use microphone arrays and pattern recognition to detect and sometimes classify drones.

Acoustic detection can be valuable in:

• Very low-altitude environments
• Areas with restricted RF emissions
• Situations where visual line of sight is obstructed

However, acoustic systems are highly sensitive to ambient noise, wind, and terrain. Their effective range is relatively short, and false positives can occur in noisy environments.

As a result, acoustic detection is typically used as a supplementary sensor, rather than a primary detection method.

Why Multi-Sensor Fusion Matters

No single detection technology is sufficient on its own. Each has blind spots, and each performs differently depending on environment, weather, and threat profile.

Modern drone detection architectures increasingly rely on sensor fusion, combining:

• Radar for wide-area detection
• RF for identification and classification
• Visual and infrared sensors for confirmation and tracking
• Acoustic sensors for close-range awareness

By correlating inputs, systems reduce false alarms and improve confidence. This layered approach is particularly important in complex environments such as ports, industrial sites, and urban areas.

Detection in the Context of Airspace Awareness

Drone detection systems do not operate in isolation. In many operational contexts, especially public safety and critical infrastructure, detection must be integrated with:

• Drone enablement systems for authorised operations
• UTM or U-space services providing cooperative traffic information
• Procedures for escalation, coordination, and response

Detection systems primarily address non-cooperative traffic: drones that are not visible in UTM systems or are operating outside authorisation. When combined with cooperative traffic data, organisations can build a far more complete picture of the lower airspace.

How AirHub Fits Into This Picture

At AirHub, we see drone detection as one element of a broader airspace awareness and governance challenge.

Through our Drone Operations Platform, we integrate data from UTM and U-space services and support integrations with drone detection systems. This allows operators and authorities to distinguish between authorised drone traffic and unknown or potentially non-compliant activity.

From a consultancy perspective, we support organisations in:

• Selecting appropriate detection technologies for their operational context
• Defining procedures for detection, escalation, and coordination
• Integrating detection capabilities into regulatory frameworks, including SORA and operational authorisations
• Aligning detection strategies with legal constraints on mitigation

Rather than treating detection as a standalone technical problem, we help organisations embed it into safe, compliant, and scalable operational concepts.

Closing Thoughts

Drone detection is not about choosing the “best” sensor. It is about understanding what you need to detect, where, and why. Radar, RF, visual, and acoustic systems all have a role to play, but only when deployed with a clear operational concept and regulatory awareness.

As drone traffic continues to increase, organisations that combine detection, cooperative traffic services, and strong operational governance will be best positioned to manage the lower airspace safely and effectively.

If you’re exploring how drone detection fits into your broader drone or airspace strategy, our team at AirHub is happy to support both technically and operationally.