8 November 2012 Usefulness of dual-frequency precipitation SAR (PSAR) for next-generation space-based precipitation mission
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Abstract
Basic system design of dual-frequency (13.6/35.5 GHz) Precipitation SAR (PSAR) is described, which is based on the orbit parameters of the GPM core satellite. The designed PSAR requires the along-track antenna size of about 4 m at both frequencies which are about twofold (13.6 GHz) and four-fold increase (35.5 GHz) compared with the DPR antennas. Instead of this, along-track resolution could be drastically improved to about 0.7 km in comparison with that of GPM-DPR (5 km). It also has reasonable number of independent samples for incoherent averaging (50~70), and swath width (~180 km) with the cross-track resolution of 2.5 km. Effects of apparent beam shift and the beam smearing caused by the spread of raindrop terminal velocity spectrum, inherent problems in PSAR, are quantitatively studied using a large number of disdrometer samples. The along-track beam shift of rain echo could also be used to estimate path-averaged raindrop fall velocity. Finally various issues in the system development and usefulness of the PSAR are discussed.
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Toshiaki Kozu, Toshiaki Kozu, Tatsuro Sasaki, Tatsuro Sasaki, Toyoshi Shimomai, Toyoshi Shimomai, } "Usefulness of dual-frequency precipitation SAR (PSAR) for next-generation space-based precipitation mission", Proc. SPIE 8523, Remote Sensing of the Atmosphere, Clouds, and Precipitation IV, 85230P (8 November 2012); doi: 10.1117/12.977303; https://doi.org/10.1117/12.977303
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