本文针对我国首颗自主发射的海洋二号（HY-2A）卫星微波散射计，建立了业务化运行的风场反演算法，该算法将散射计海面风矢量反演分为粗搜索和精搜索两个步骤，有效地提高了运算效率。采用矢量圆中数滤波算法进行风向模糊解去除，并采用NCEP风场作为背景场对初始场进行选择，提高了模糊去除准确性。算法的反演结果经与NDBC对比和ASCAT风场星星对比验证，结果表明HY-2A卫星微波散射计可提供风速精度优于2 m/s或10 %，风向精度优于±20°的海面风场观测产品，可满足海洋科学研究和海洋业务应用的需求。

The routine wind fields retrieval algorithm for China's microwave scatterometer onboard HY-2A (HY2-SCAT) was developed. By introducing a two-step search schema into the wind retrieval process, which included a coarse-search and an optimal-search, the efficiency of wind retrieval was greatly improved. Circular median filter was applied to remove the ambiguities, and the NCEP wind field was used as a background to re-initialized wind field consists of ambiguous wind vectors, so that the ambiguity removal skill can be largely enhanced. Wind vectors observed by HY2-SCAT were evaluated by comparison with NDBC buoy observations and ASCAT observations. The RMS difference was less than 2 m/s or less than 10 % for the comparison of wind speeds and the RMS difference was less than 20 degree for the comparison of wind direction, which indicated that the wind products provided by HY2-SCAT can meet the requirements for science and routine meteo users.

林明森（1963—），男，福建莆田市人，博士，研究员，主要从事海洋遥感研究