| 摘要 |
PROBLEM TO BE SOLVED: To provide a rain attenuation determining apparatus with a small load in computation, which is simple and determines whether a rainfall data unacquirable area results from rain attenuation. SOLUTION: The apparatus comprises: an attenuation calculating means 311 for calculating an attenuation factor and a one-way path integrated attenuation quantity from acquired observation data; a minimum reception sensitivity calculating means 312 for calculating a minimum reception sensitivity from an atmospheric attenuation and the like; a detection limit calculating means 313 for calculating a detection limit reflection intensity from a detection limit rainfall intensity which is previously set; and an undetectable area estimating means 314 for estimating an undetectable area from a result obtained by comparing values calculated by the attenuation calculating means 311, the minimum reception sensitivity calculating means 312 and the detection limit calculating means 313. COPYRIGHT: (C)2009,JPO&INPIT
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