High-frequency (HF) radars have been developed to map surface currents offshore by means of land-based stations. Presently available radar systems use frequencies between 25 and 30 MHz and allow a spatial resolution of 1 km and ranges of up to 50 km. This paper reports on the experience with a shipborne radar and discusses problems which arise for the azimuthal resolution on a metal ship, the correction for the ship's speed, and limitations due to pitch-and-roll motions. Current measurements during cruises to the North Atlantic are presented. It has been found that, with the support of the satellite-supported Global Positioning System, the shipborne HF radar can measure surface current velocities with an accuracy of some 5 cm/spl middot/s/sup -1/.
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机译：已经开发了高频（HF）雷达，以通过陆基站绘制近海的地表电流。当前可用的雷达系统使用25到30 MHz之间的频率，并允许1 km的空间分辨率和高达50 km的范围。本文报告了舰载雷达的经验，并讨论了金属舰船的方位分辨率，舰船速度的校正以及俯仰和横摇运动的局限性所引起的问题。介绍了北大西洋航行期间的当前测量值。已经发现，在卫星支持的全球定位系统的支持下，船载高频雷达可以以大约5 cm / spl middot / s / sup -1 /的精度测量表面电流速度。
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