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2. Ambiguity resolution - Wikipedia

   en.wikipedia.org/wiki/Ambiguity_resolution

   This happens with all radar systems. Radar aliasing happens when: Pulse repetition frequency (PRF) is too low to sample Doppler frequency directly; PRF is too high to sample range directly; Pulse Doppler sonar uses similar principles to measure position and velocity involving liquids.

3. Acoustic location - Wikipedia

   en.wikipedia.org/wiki/Acoustic_location

   As World War II neared, radar began to become a credible alternative to the sound location of aircraft. For typical aircraft speeds of that time, sound location only gave a few minutes of warning. [8] The acoustic location stations were left in operation as a backup to radar, as exemplified during the Battle of Britain. [16]

4. Over-the-horizon radar - Wikipedia

   en.wikipedia.org/wiki/Over-the-horizon_radar

   The frequency of radio waves used by most radars, in the form of microwaves, travel in straight lines.This generally limits the detection range of radar systems to objects on their horizon (generally referred to as "line of sight" since the aircraft must be at least theoretically visible to a person at the location and elevation of the radar transmitter) due to the curvature of the Earth.

5. Kürecik Radar Station - Wikipedia

   en.wikipedia.org/wiki/Kürecik_Radar_Station

   AN/TPY-2 radar (left) installed in Japan, similar to the one in Kürecik. Kürecik Radar Station (Turkish: Kürecik Radar Üssü) is a military installation located in the town of Kürecik in Malatya Province, southeastern Turkey. It was established in 2012 for use by NATO as an early-warning radar against ballistic missile attacks.

6. AN/SPY-1 - Wikipedia

   en.wikipedia.org/wiki/AN/SPY-1

   The AN/SPY-1 [a] is a United States Navy 3D radar system manufactured by Lockheed Martin.The array is a passive electronically scanned system and a key component of the Aegis Combat System.

7. Relativity of simultaneity - Wikipedia

   en.wikipedia.org/wiki/Relativity_of_simultaneity

   This is illustrated in the figure at right, which shows radar time/position isocontours for events in flat spacetime as experienced by a traveler (red trajectory) taking a constant proper-acceleration roundtrip. One caveat of this approach is that the time and place of remote events are not fully defined until light from such an event is able ...