Passive RF Geolocation
DetectionOpen-Source Verified
Multi-node passive sensor network that locates the drone AND its operator by triangulating their RF emissions (TDoA / AoA). Critical for finding pilots of fiber-optic-blind systems and for targeting EW or kinetic effects on the launch site.
How It Works
Three or more passive receivers measure time-difference-of-arrival or angle-of-arrival on the drone's downlink and the operator's uplink. Software fuses the bearings to produce a geolocation fix on both ends of the link.
Technical Specifications
range
5–40 km per node, network-dependent
cost
$80,000–$600,000 per network
deployment Time
Hours (vehicle-mounted) to permanent
crew Required
1–3 operators
weight
20–200 kg per node
power Requirement
Vehicle / mains power
Advantages
- + Fully passive — no emissions to detect
- + Locates operator, enabling counter-battery / arrest
- + Works on any RF-emitting drone, including encrypted military links
- + Cues other effectors silently
Disadvantages
- − Useless against fiber-optic drones (no RF)
- − Requires multiple synchronized nodes
- − Reduced accuracy in dense urban multipath
Tactical Deployment Tips
- ▸ Combine with mobile EW or kinetic strike on the located operator
- ▸ Pre-survey site for best multi-node geometry
Limitations & Vulnerabilities
- ⚠ Defeated by fiber-optic control
- ⚠ Brief or hopping emissions reduce fix quality
Drones It Defeats
Drone types ranked by how well this system defeats them — tap any drone for details
Commercial COTS QuadcopterHighMilitary Reconnaissance QuadcopterHighFPV Kamikaze DroneHighHeavy-Lift FPV BomberHighHeavy-Lift Cargo / Resupply UAVHighMini ISR Fixed-WingHighVTOL Fixed-Wing HybridHighCBRN / Hazmat DroneHighMothership / Carrier UAVHighAcoustic-Stealth RotaryHighConverted Agricultural Heavy-LiftHighTactical Fixed-Wing UAVMediumMALE / HALE Strategic UAVMediumSmall Loitering MunitionMediumNaval USV / UUVMediumDecoy / Electronic Warfare DroneMediumMicro / Nano DroneMediumAdversary Interceptor DroneMediumLarge Loitering MunitionLowCoordinated Drone SwarmLowAI-Autonomous Strike DroneLowTethered Surveillance DroneLowJet-Powered UCAVLowHigh-Altitude Pseudo-Satellite (HAPS)LowFiber-Optic Guided FPVNoneWinged Glide MunitionNone
⚠ How Adversaries Defeat This System
Active enemy adaptations observed in the field — distinct from passive limitations above
- ▸ Fiber-optic control eliminates RF emissions
- ▸ Frequency hopping and very short bursts degrade geolocation
Sources & Further Reading
- ▸ DroneShield / CRFS — passive RF C-UAS product documentation
- ▸ Janes — Passive RF C-UAS (2024)