WEATHER RADAR APPARATUS AND RAINFALL RATE CALCULATION METHOD, AND PROGRAM

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PROBLEM TO BE SOLVED : To calculate a rainfall rate with high resolution and high accuracy. SOLUTION : The weather radar system includes transmitting/receiving units 11-16 simultaneously transmitting a radar wave of a horizontally polarized wave and a vertically polarized wave and receiving the reflected wave thereof and a signal processing unit 17 calculating a received power of each polarized wave from the received signal. A data conversion unit 19 calculates a radar reflectivity factor (ZH, ZV) and a differential radar apparatus reflectivity factor (ZDR) based on the received power of each polarized wave, calculates an average precipitation intensity (Rave) of each low resolution area based on a specific cross polarization differential phase (KDP) calculated based on a cross polarization differential phase (ϕDP) of the received power, calculates a first constant (B) in a relational expression (ZH=B×Rβ; B, β : constant) between the radar reflectivity factor (ZH) and a rainfall rate (R) from the differential radar apparatus reflectivity factor (ZDR), estimates further a second constant (β) based on the average rainfall rate (Rave) and the radar reflectivity factor (ZH), and calculates the rainfall rate (R) with a first space resolution on the basis of the relational expression. COPYRIGHT : (C)2011, JPO&INPIT