The original commercially launched passive radar — Lockheed Martin Mission Systems, 1998. Uses FM radio and analogue TV signals (40–100 MHz). Detects aircraft, helicopters, cruise missiles, ballistic missiles, RPVs / drones. Update rate 200+ tracks at 8 Hz; total system fits in ~27 sq ft. Two antenna variants: 360° four-beam Adcock array, and 100°/six-beam linear array. Range up to ~100 nautical miles. Programme dormant but the architectural reference for everything that followed.
| Country | United States |
|---|---|
| Subcategory | RF / SIGINT detection |
| Price | $3–5M historical (per system) |
| Subtype | Passive radar |
| Form factor | ~100 NM · 200 tracks/8 Hz |
| Use | Air surveillance |
| Type | Passive |
| SWaP | VME rack; transit cases; 1.5 kW 120V; 1-2 person setup |
| Sensor modality | FM/TV PCL |
| Notable partners | Developed by Lockheed Martin Mission Systems (Gaithersburg, MD); research partnership with University of Illinois; US gov customers (confidential) |
| Coverage | 3D |
| Scan type | Passive |
| Mounting | Fixed/mast, Vehicle |
| Architecture | Passive Coherent Location exploiting FM/TV broadcast transmitters; COTS, no moving parts |
| Output data | Position, Velocity, Altitude, Track ID |
| Frequency (GHz) | ~40-100 MHz FM/TV illuminators |
| Active/Passive | Passive |
| Update/revisit rate | Continuous (no moving parts) |
| Detection range (km) | 278 |
| Tx power & licensing | No transmitter; covert; no emission licensing |
| Detection range (km) | 278 |
| Integration interfaces | Silent Sentry track format or OTH Gold; Link 16/XML planned |
| All-weather / day-night | All-weather, day & night |
| Angular accuracy/resolution | 150 m horizontal, 1000 m vertical (FM) |