Table of Contents
⚠ Disclaimer: This entry may be incomplete, out of date, or inaccurate. It is AI-maintained on a best-effort basis. Do not rely on it as a sole source — verify claims independently using the sources listed below.
Summary
CRFS (UK) makes the RFeye family of networked, passive RF spectrum-monitoring sensors, marketed for drone detection among other spectrum-dominance use cases (military EW, border security, spectrum regulation). Rather than matching known drone protocol signatures, RFeye’s “signal detectors” hunt for signals of interest — telemetry, video downlinks, payload data transfer — and geolocate the emitter in 3D the moment a match is found. This makes it agnostic to whether a drone is Remote ID compliant, COTS, modified, or military; it detects anything emitting RF in its covered bands. Limitation: like all RF-based systems, it has zero capability against drones with no active RF emission (fiber-optic tethered, fully autonomous pre-programmed, RF-silent).
Key Facts
- Manufacturer: CRFS Ltd, United Kingdom
- Type: Company — RF sensor hardware + software (RFeye Suite)
- Frequency coverage: 100 MHz to above 10 GHz across the RFeye Node product line (specific range varies by node model, e.g. 100-8, 100-18, 100-40)
- Geolocation techniques: Angle of Arrival (AoA), Time Difference of Arrival (TDoA — 3 nodes for 2D, 4 for 3D), Frequency Difference of Arrival (FDoA), Power of Arrival (PoA)
- Claimed range: Up to 400 km for military drones under favorable conditions; shorter for COTS drones depending on power and environment
- Integration: TRL-9; integrated into L3Harris’ Drone Guardian and Rafael’s Drone Dome C-UAS systems
- Status: Active; deployed by NATO members and allied governments for spectrum dominance and drone detection
How It Works
RFeye’s core technology is “signal detectors” rather than drone-signature libraries: the system is configured to recognize categories of RF activity (telemetry, video link modulation characteristics, payload data transfer) instead of matching against a database of specific drone models. CRFS argues this is more robust against modified, homebuilt, or military drones that a library-based system (tuned to recognize specific COTS protocols) would miss. When a signal of interest is detected, the networked RFeye nodes immediately compute a 3D geolocation (latitude, longitude, altitude) using AoA, TDoA, FDoA, or PoA techniques depending on deployment geometry, streamed to a C2 platform via open APIs.
Because detection triggers on RF characteristics of the signal itself rather than decoding its content, RFeye can identify a drone’s presence and location without needing the drone’s cooperation — it doesn’t rely on Remote ID broadcasts, though it can also monitor those bands if desired. The same underlying RFeye Node/Array hardware family also serves CRFS’ broader spectrum-monitoring, EMSO, TSCM, and border-security product lines.
Capabilities
- Non-cooperative detection: Works against COTS, modified, and military drones without needing a specific protocol signature match
- 3D geolocation: Full lat/long/altitude fix via multi-technique geolocation (AoA/TDoA/FDoA/PoA)
- Swarm detection: Rapid geolocation cycles (down to once per second) support tracking multiple simultaneous drones
- Open architecture: Streaming geolocation data and APIs for integration into third-party C2 systems — already integrated into L3Harris and Rafael platforms
- Dual-use spectrum monitoring: The same sensor network can be used for general RF spectrum awareness beyond drone-specific detection
Limitations
- RF-only: No capability against fiber-optic tethered or fully RF-silent autonomous drones
- Geometry-dependent accuracy: TDoA/FDoA geolocation accuracy depends on favorable sensor node placement and spacing; a single node can only provide a bearing (AoA), not a fix
- No integrated countermeasures: RFeye is a detection/geolocation sensor family — interdiction requires separate systems (as seen in its L3Harris/Rafael integrations)
Notable Developments
- 2025-2026: Reported acquisition by Motorola Solutions (details and closing date not independently confirmed in this review) — if accurate, this places CRFS alongside D-Fend Solutions, also reportedly acquired by Motorola Solutions around the same period, as part of a broader Motorola Solutions push into C-UAS RF/spectrum technology
- Founded 2007; has operated for nearly two decades as an independent RF spectrum-monitoring vendor prior to the reported acquisition
Key People
- Alistair Massarella — Founder; sources vary on his current title (COO in some listings)
- Matthew Hunt — Co-founder and CTO
- Pio Szyjanowicz — Listed as CEO in some sources; leadership titles found in research for this entry were inconsistent across sources (Nick Balon is also listed as CEO in at least one source) — treat individual titles as unverified pending a primary-source org chart, especially given the reported Motorola Solutions acquisition may have changed leadership structure
People — Last Reviewed: 2026-07-07
Claim Verification
Claim: RFeye can geolocate military drones at up to 400 km
Status: Unverified independently — company-stated figure from CRFS marketing materials, described as achievable “under favorable conditions.” Supporting sources: CRFS Drone Detection overview. Refuting/questioning sources: None found. Summary: This is a best-case figure for high-power military emitters, not a realistic planning range for COTS commercial drones — treat as an upper bound, not a typical operating range.