Perceive
DAR-B
Passive Coherent Location System
Zero emissions, full picture. Passive radar that detects and tracks targets using signals you never transmitted.
Detect, track, and geolocate airborne and surface targets without emitting a single watt of RF.
Overview
DAR-B is a passive coherent location (PCL) radar and signals intelligence platform. Rather than transmitting its own radar pulses, it exploits ambient FM broadcast transmissions as opportunistic illuminators to detect, track, and geolocate airborne and surface targets in real time — with zero active RF emission. The system produces no radar signature that electronic support measures can find.
Eight receive antennas arranged in a circular array provide simultaneous 360° coverage across eight azimuth sectors. Targets are detected by correlating the received FM reference signal against target reflections, producing range and velocity data. A multi-frame tracker resolves individual detections into persistent target tracks, reporting range in kilometres and radial velocity in metres per second.
Beyond passive radar, DAR-B estimates the bearing of detected targets using high-resolution direction-of-arrival algorithms, resolving multiple simultaneous targets in angle. An operator HMI displays live range-velocity maps, bearing plots, and annotated target tracks in real time.
DAR-B turns the FM broadcast spectrum into a passive radar illuminator. No emissions. No RF signature. Full situational awareness.
Military & security use cases
- Passive air-domain surveillance with no detectable radar signature
- Force protection: covert perimeter radar around bases and critical infrastructure
- Counter-drone detection and bearing estimation
- Electronic warfare support: passive geolocation of airborne targets
- Border and maritime surveillance in RF-contested environments
- ISR roles where active radar emission is operationally prohibited
What it delivers
- Full situational awareness with zero RF emissions
- Simultaneous 360° coverage and multi-target tracking
- Target range, velocity, and bearing from a single passive receiver
- No signature for adversary ESM to detect or geolocate
- Covert persistent surveillance suitable for forward and fixed positions
Key capabilities
Inside DAR-B.
- Zero active RF emissions — inherently LPI/LPD, undetectable by ESM
- Exploits ambient FM broadcasts (87.5–108 MHz) as radar illuminators
- Simultaneous 360° azimuth surveillance across eight sectors
- Real-time detection and ranging of airborne and surface targets
- Radial velocity measurement per target (m/s)
- Multi-frame target tracker — persistent tracks with deduplication and filtering
- High-resolution direction-of-arrival estimation per target
- Interference suppression with adaptive null steering
- Automated array calibration for sustained coherent performance
- Spectrum monitoring and FM reference signal analysis
- Live operator display: range-velocity maps, bearing plots, and track overlays
Field view
Product FAQ
DAR-B — questions & answers
How does DAR-B detect targets without transmitting anything?
DAR-B uses existing FM broadcast stations as the radar's transmit source. Its antenna array listens for reflections of those broadcasts off passing targets and correlates them against the direct broadcast signal — producing range and velocity data for each detected target, with no active emission from the system itself.
What targets can DAR-B detect and track?
DAR-B detects and tracks airborne and surface targets with detectable motion — including aircraft, drones, and vehicles. The system reports range in kilometres, radial velocity in m/s, and estimated bearing, and maintains persistent tracks across multiple detection intervals.
What makes DAR-B LPI/LPD?
DAR-B is a purely passive receive system. It emits nothing. There is no radar waveform for enemy electronic support measures to detect, intercept, or geolocate — making it covert by design.
Rest of the system
Put DAR-B to work.
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