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- 'Ghadir' OTH Radar - an Iranian over-the-horizon radar, part of Iran's Sepehr Phased Radar System.Currently active.
- 'OTH-SW' OTH Radar - a Chinese over-the-horizon radar. It is known to operate with pulse repetition frequencies of 43 Hz and 86 Hz. Currently active.
- 29B6 'Kontayner' OTH Radar - a Russian over-the-horizon radar. It is currently very active in Europe.
- 77Ya6 'Voronezh' radar - a Russian radar family, capable of aircraft and ballistic missile monitoring. Currently active.
- CODAR (Coastal Ocean Dynamics Applications Radar) - used for near-surface ocean monitoring, such as waves and water currents. Commonly becomes a source of interference for amateur radio operators. Currently active.
- Chinese 'Foghorn' OTH radar - a Chinese over-the-horizon radar, known as "foghorn" among amateur radio operators. Not much is known about it. Currently active.
- Digisonde - ionosondes that use pulsed signals that can gather more radar information than a traditional ionosonde sweep. It is sometimes called "The Grinder" by amateur operators. Currently active.
- Duga 3 - a Soviet over-the-horizon radar system used as part of the Soviet missile defence early-warning radar network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl and Chernihiv in the Ukrainian SSR (present-day Ukraine), the other in eastern Siberia. The Duga systems were extremely powerful, over 10 MW in some cases, and broadcast in the shortwave radio bands. They appeared without warning, sounding like a sharp, repetitive tapping noise at 10 Hz, which led to it being nicknamed by shortwave listeners the Russian Woodpecker. Currently inactive.
- Grand Réseau Adapté à la Veille Spatiale (GRAVES) - a French space-surveillance system for low-orbit (up to 1000km) satellites. Emitter is based near Dijon, France. Currently active.
- High Frequency Active Auroral Research Program (HAARP) - an ionospheric research program conducted in Gakona, Alaska. Current status is not known.
- High Power Auroral Stimulation (HIPAS) - operated by the University of California, Los Angeles. Currently inactive.
- Ionosonde - also known as a chirpsounder or ionospheric sounder; a radar that examines the Ionosphere and monitors HF propagation conditions by sweeping the HF band and receiving the echoes. Currently active.
- Jindalee Operational Radar Network (JORN) - an Australian OTHR system that operates uniquely in that its radar bursts include an intro tone before the burst. Currently active.
- PLUTO II OTH Radar - located in the Sovereign Base Area just outside RAF Akrotiri in Cyprus. PLUTO II is very active in Europe.
- Primary Aeronautical Surveillance Radar - a conventional radar sensor that illuminates a large portion of space with an electromagnetic wave and receives back the reflected waves from targets within that space. Currently active.
- Relocatable Over-the-Horizon Radar (ROTHR) - also known as AN/TPS-71, is an OTH radar used by the United States Navy that uses bistatic ionospheric backscattering for wide area surveillance. Currently active.
- Secondary surveillance radar (SSR) - a radar system used in air traffic control. A surveillance radar system which uses transmitters/receivers (interrogators) and transponders. Currently active.
- SuperDARN (Super Dual Auroral Radar Network) - sometimes known as The Grasshopper, is an international radar network used for scientific purposes. The network is used to study plasma convection in the upper atmosphere. All worldwide sites are operated by various research organizations and universities. Currently active.
may 9 2024 ∞
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