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双多普勒天气雷达风场探测的可靠性研究
RELIABILITY STUDY OF DETERMINING WIND WITH DUAL-DOPPLER RADARS
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摘要: 从双多普勒天气雷达风场探测原理和多普勒天气雷达数据处理技术出发，分析了影响双勒天气雷达风场反演可靠性的内在因素。即两部雷达观测同一点的非一致性 (空间和时间上的非一致性) 和空间各测量点观测时间及照射体积的非统一性，以及微波在大气中的非直线传播和地球表面的非几何平面引起的坐标、定位等问题都严重影响了双多普勒天气雷达风场反演可靠性。该文提出一些解决办法，但在应用双多普勒天气雷达风场反演数据时，还必须进行可靠性分析。Abstract: Based on the theories for determining wind fields with dual-Doppler radars and the technology of Doppler radar data processing, the intrinsic factors affecting dual-Doppler retrieval reliability are analyzed. Because of the limitations of radar determination methods, there exist non-simultaneity and differences in illuminant volumes and spatial positions in measurement data from two radars. Since the microwave transmission curve is not straight and the earth surface is not flat, the retrieval of the dual-Doppler radar sounding technology is influenced seriously. When wind fields derived from dual-Doppler radar observation are used, their reliability must been analyzed.
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Key words:
- Dual-Doppler radars;
- Wind field;
- Reliability
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