摘要
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. Cir-cular 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.
出处
《中国工程科学》
北大核心
2013年第7期68-74,共7页
Strategic Study of CAE
基金
国家自然科学基金项目资助(41106152)
中国高技术研究发展计划(863计划)重点项目资助(2007AA092201
2008AA09A403)
卫星海洋环境动力学国家重点实验室开放研究基金资助(SOED1103)
国家海洋局青年海洋科学基金资助(2011414)
海洋公益项目自主海洋动力环境卫星微波遥感处理技术研究示范资助(201105032)
海洋公益项目HY-2A卫星海洋动力环境探测数据应用服务技术系统与示范资助(201305032)
关键词
HY-2A
微波散射计
风场反演算法
HY-2A
microwave scatterometer
wind fields retrieval algorithm
