高频地波雷达生成海洋表面矢量流图

武汉大学研制的双站高频地波雷达系统OSMAR2000利用测得的两幅单站径向海流图生成矢量海流图。经典矢量流图生成方法不能直接应用到OSMAR2000系统中。本文提出一种先在极坐标系下用自然三次样条函数将径向流插值到公共网格上然后直接进行矢量合成的矢量海流图生成方法。OSMAR2000在东海的表面矢量流实测结果与作对比验证的传统海流计测量结果十分吻合。对比数据表明，该方法是可行的，且优于先进行径向流线性插值后矢量合成的矢量流图生成方法。这也是国内首次利用高频地波雷达实现海洋表面矢量流的实时监测。

MAPPING OCEAN SURFACE VECTOR CURRENTS BY DUAL HF GROUND WAVE RADARS

Dual HF ground wave radars system OSMAR2000 developed by Wuhan University maps ocean surface vector currents by use of two radial current maps measured by both radars The classical algorithm for vector currents mapping cannot be applied in the system directly In this paper,an alternative algorithm applicable in OSMAR2000 is developed We interpolate radial currents mapped by each radar to a common grid via natural boundary cubic spline under the polar reference frame,and then combine them into vector currents In the East China Sea experiment the vector currents mapped by OSMAR2000 well coincided with the concurrent measurements by in situ conventional ocean current meters Comparison data show that the algorithm developed by this paper is applicable in OSMAR2000 and it works better than the algorithm on the basis of linear interpolation on radial currents