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Proceedings Paper

Usefulness of dual-frequency precipitation SAR (PSAR) for next-generation space-based precipitation mission
Author(s): Toshiaki Kozu; Tatsuro Sasaki; Toyoshi Shimomai
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Paper 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.

Paper Details

Date Published: 8 November 2012
PDF: 8 pages
Proc. SPIE 8523, Remote Sensing of the Atmosphere, Clouds, and Precipitation IV, 85230P (8 November 2012); doi: 10.1117/12.977303
Show Author Affiliations
Toshiaki Kozu, Shimane Univ. (Japan)
Tatsuro Sasaki, Shimane Univ. (Japan)
Toyoshi Shimomai, Shimane Univ. (Japan)

Published in SPIE Proceedings Vol. 8523:
Remote Sensing of the Atmosphere, Clouds, and Precipitation IV
Tadahiro Hayasaka; Kenji Nakamura; Eastwood Im, Editor(s)

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