Adaptive Range Oversampling to Improve Estimates of Polarimetric Variables on Weather Radars
نویسندگان
چکیده
منابع مشابه
5b.6 Optimum Processing in Range to Improve Estimates of Doppler and Polarimetric Variables on Weather Radars
Radar meteorology applications rely on pulsed weather radars that survey the atmosphere and estimate a set of meteorological variables for each resolution volume. The reliability of these applications depends on the quality of the supplied data. To reduce the statistical uncertainty of estimates of spectral moments and polarimetric variables for each resolution volume, weather radars often aver...
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Processing oversampled signals in range with a whitening transformation has been proposed as a means to reduce the variance of meteorological variable estimates on polarimetric Doppler weather radars. However, the original formulation to construct decorrelation transformations does not account for mismatches in the polarimetric channels, which results in abnormally biased polarimetric variable ...
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This paper describes a real-time implementation of adaptive range oversampling processing on the National Weather Radar Testbed phased-array radar. It is demonstrated that, compared to conventional matched-filter processing, range oversampling can be used to reduce scan update times by a factor of 2 while producing meteorological data with similar quality. Adaptive range oversampling uses momen...
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Piemonte region, in the north-western Italy, is characterized by complex orography and Mediterranean influence that often causes extreme rainfall event, during the warm season. Although the region is monitored by a dense gauge network (more than one gauge per 100 km 2 ), the ground measurements are often inadequate to properly observe intense and highly variable precipitations. Polarimetric wea...
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Among the planned upgrades for the NEXRAD network of weather surveillance radars are superresolution (1/4 km reflectivity and 0.5 deg radials) and polarimetric capabilities. In either case, keeping current update times (i.e., same antenna rotation rates) results in meteorological variable estimators with unacceptable large errors. A family of methods to reduce errors in estimates of spectral mo...
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ژورنال
عنوان ژورنال: Journal of Atmospheric and Oceanic Technology
سال: 2014
ISSN: 0739-0572,1520-0426
DOI: 10.1175/jtech-d-13-00216.1