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Erschienen in:
2021 | OriginalPaper | Buchkapitel
7. Near-Nadir Wind Estimation Over Water with Airborne Precipitation Radar
verfasst von : Alexey Nekrasov
Erschienen in: Foundations for Innovative Application of Airborne Radars
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Abstract
APR-2 is an airborne, dual-frequency (Ku- and Ka-band), dual-polarization Doppler rain profiling radar. Its antenna scans in the ±25° cross-track elevation range allowing the radar to measure atmospheric precipitation and sea surface NRCS. The wind measuring algorithm has been proposed and investigated with the help of simulations. The study has shown that airborne radar instrument for measurement geometry similar to the APR-2 geometry and operating in a scatterometer mode can be applied to remote measurement of sea surface wind speed and direction at near-nadir incidence angles based on the measuring algorithm developed in case of precipitation absence. As azimuth water surface slope variance has been assumed to be elliptical, wind direction can be estimated, unfortunately, only with an ambiguity of 180°. It means that in principle the APR-2 also can be applied to wind retrieval over water surface during a rectilinear flight in addition to its typical meteorological application.