Concepts
Concepts glossary term
Over-the-Horizon Radar (OTHR)
Enables continental-scale, beyond-line-of-sight early warning and wide-area maritime domain awareness.
Concepts
Also: Over-the-Horizon Radar (OTHR), over-the-horizon-radar-othr, OTHR, othr, Skywave Radar, Beyond-the-Horizon Radar
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01 Definition
02 Detailed_Analysis
Over-the-Horizon Radar (OTHR) is a specialized class of radar systems that bypass the line-of-sight limitations imposed by the Earth's curvature. By transmitting high-frequency (HF, 3–30 MHz) electromagnetic waves, OTHR systems exploit ionospheric refraction (skywave radar) or the conductive surface of seawater (surface-wave radar) to detect and track aerial, naval, and ballistic missile targets at ranges extending from 1,000 to over 3,500 kilometers.
03 Key_Facts
- ▸ Utilizes HF band (3–30 MHz) signals to achieve ranges from 1,000 to 4,000 km
- ▸ Relies on real-time ionospheric sounding and ray-tracing modeling for coordinate calibration
- ▸ Provides early warning against stealth platforms, cruise missiles, and sea-surface craft
- ▸ Requires massive phased antenna arrays spanning hundreds to thousands of meters
09 FAQ
What is Over-the-Horizon Radar (OTHR)? ▾
Over-the-Horizon Radar (OTHR) — a concept identified in the R694-R852 research corpus covering fusion, advanced weapons, and dual-use technology.
Why does Over-the-Horizon Radar (OTHR) matter? ▾
Enables continental-scale, beyond-line-of-sight early warning and wide-area maritime domain awareness.
Quick_Facts
- Category
- Concepts
- Aliases
- Over-the-Horizon Radar (OTHR), over-the-horizon-radar-othr, OTHR, othr, Skywave Radar, Beyond-the-Horizon Radar
- Sources
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