Abstract
Over-the-horizon radar (OTHR) systems, or skywave propagation systems, use the high frequency (HF) band (3 to 30 MHz) to “bounce” or “refract” a signal off the ionosphere to detect tracks of interest (TOIs) between 500 and 2000 nautical miles from the transmitter/receiver pair. This range is “an order of magnitude greater than is possible with conventional line-of-sight radars” [1]. Since their initial employment, OTHR systems have significantly improved in abilities to detect and track TOIs such as aircraft, ballistic and cruise missiles, and ships [2].
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