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多普勒雷达风场反演VAP方法的资料预处理
THE PRE-PROCESSING OF DOPPLER RADAR WIND RETRIEVAL VAP TECHNIQUE
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摘要: 在分析了三类单多普勒雷达反演风场方法的基础上, 认为VAP方法是近期内可望在业务中应用的方法, 并指出VAP方法的关键是能否将原始资料中的中-U及以上尺度的风场信息过滤出来, 以消除中-V尺度以下风场信息对反演结果的影响.为此提出了二维区域滑动低通滤波方法对资料进行预处理.此外还对VAP方法的风速计算公式进行了改进以减小计算误差.Abstract: Based on the analysis of three kinds of wind retrieval techniques with Doppler radar, Velocity Azimuth Processing (VAP) technique is considered to be used in operation in the near future, and the key of which is whether the wind field information on meso-β scale and larger scale is filtered out from initial data, in order to eliminate the influences of the wind field information smaller than meso-V scale on retrieval results. Therefore, the pre-processing of data is made using 2-D low pass filter method. In addition, the wind velocity computational formula of VAP method is improved.
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Key words:
- Doppler radar;
- Wind retrieval;
- Filtering
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表 1 反演风向和风速随△θ的变化
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