over-the-horizon radar

(redirected from Over the horizon radar)
Also found in: Dictionary.

over-the-horizon radar

[′ō·vərthə hə′rīz·ən ′rā‚där]
(electromagnetism)
Long-range radar in which the transmitted and reflected beams are bounced off the ionosphere layers to achieve ranges far beyond line of sight.

over-the-horizon radar

over-the-horizon radar
Principle of over-the-horizon radar.
A radar system that makes use of the atmospheric reflection and refraction phenomena to extend its range of detection beyond the line of sight. Targets can be detected by over-the-horizon radar thousands of miles away. Over-the-horizon radars may be either forward-scatter or back-scatter systems.
References in periodicals archive ?
For instance, it developed Over the Horizon Radar, led early research efforts on the computer "mouse" and a number of other human-computer interface techniques, and has been a principal factor in a number of advanced biomedical techniques, including advances in ultrasound.
Over the horizon radars, space-based radars and acoustic sensors are among the recommendations found in the report.
Over the Horizon radars including the current ROTHR systems can be significant contributors to homeland defense, providing Wide Area Surveillance of both air and surface targets at ranges up to 2,500 nautical miles.