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 performing dual polarization observation from a received signal of the transmitting/receiving units and calculating a received power of each polarized wave. A data conversion unit 19 calculates a radar reflectivity factor (Z) with a high resolution on the basis of a beam width and a pulse width of a radar wave based on the received power, calculates a specific cross polarization differential phase (KDP) with a low resolution based on a cross polarization differential phase (ϕDP) of the received power, calculates an average rainfall rate (Rave[mm/h]) of each low resolution area based on the specific cross polarization differential phase (KDP), estimates a relational expression between the radar reflectivity factor (Z) and a rainfall rate (R[mm/h]) based on the average rainfall rate (Rave[mm/h]) and the radar reflectivity factor (Z), and calculates the rainfall rate (R [mm/h]) with a high resolution using the relational expression. COPYRIGHT : (C)2011, JPO&INPIT