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Suppressing Radio Frequency Interference in HF Radars

机译：抑制HF雷达中的射频干扰

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In the last 10 to 15 years, high-frequency (HF) radars for the remote sensing of oceanographic parameters like surface currents and ocean waves have become more and more accepted. A network of radars is currently being installed around U.S. coasts and is planned to become an element of the National Oceanic and Atmospheric Administration'sIntegrated Ocean Observing System. In addition, the increasing number of HF radars in operation around the world is raising awareness on frequency allocation and compatibility issues.HF radars are operated in the HF band of the radio spectrum, between three and 30 megahertz. In this frequency range, ground-wave propagation allows electromagnetic waves to travel far beyond the horizon along the salty, highly conductive ocean surface. Depending on their frequencies and on the conditions, these waves may also be scattered and reflected by the ionosphere, which is known as sky-wave propagation. Some military radar applications exist using this propagation mode, such as the French Nostradamus or the Australian Jindalee radars, achieving working ranges of several thousand kilometers. HF radars used for oceanographic applications are designed to make use of ground-wave propagation and reach up to 200 nautical miles. These are also referred to as surface-wave radars.
机译：在过去的10到15年中，用于遥测诸如海流和海浪等海洋学参数的高频（HF）雷达越来越受到人们的欢迎。雷达网络目前正在美国海岸附近安装，并计划成为美国国家海洋与大气管理局综合海洋观测系统的组成部分。此外，世界范围内运行的HF雷达数量不断增加，这引起人们对频率分配和兼容性问题的认识，HF雷达在3至30兆赫兹的无线电频谱的HF波段中运行。在此频率范围内，地波传播使电磁波沿着咸的，高度导电的海洋表面传播到地平线之外。根据它们的频率和条件，这些波也可能被电离层散射和反射，这被称为天波传播。存在一些使用这种传播模式的军用雷达应用，例如法国Nostradamus或澳大利亚的Jindalee雷达，可达到数千公里的工作范围。用于海洋学的高频雷达旨在利用地波传播并达到200海里。这些也称为表面波雷达。

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