radar horizon


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Related to radar horizon: Over the horizon radar

radar horizon

The locus of points at which the rays from a radar antenna become tangential to the Earth's surface. On the open sea this locus is horizontal, but on land it varies according to the topographical features of the terrain.
References in periodicals archive ?
Measuring 35 metres long, it can lift a 500kg payload to its 5,000-ft operating altitude, extending the radar horizon to 160-km.
This is the first major series of tests for the integrated air and missile defense (IAMD)-equipped USS John Paul Jones(DDG-53), and highlights the system's accuracy in identifying and destroying threats from beyond the radar horizon.
Land-based radar cannot detect helicopters further than about 110km because the aircraft operate at low level, below the radar horizon.