Looking over the horizon (HF radar)

The history of HF (over-the-horizon) radar and its basic principles are outlined. Advances in signal processing that have made HF radar an operational reality are reviewed. Working units that the US Navy and the US Air force have in place, as well as some units under construction are described. Nondefence applications of HF radar, most notably the interdiction of drug traffickers and the monitoring of wind patterns over vast stretches of the ocean are noted.<
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