| 简介 |
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 (Z) with a high resolution based on a 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) of each low resolution area based on the specific cross polarization differential phase (KDP), calculates a first constant (B) in a relational expression (Z=B×Rβ; B, β : constant) between the radar reflectivity factor (Z) and a rainfall rate (R) based on the radar reflectivity factor (Z), estimates a second constant (β) based on the first constant (B), the average rainfall rate (Rave) and the radar reflectivity factor (Z), and calculates the rainfall rate (R) with a first space resolution on the basis of the relational expression.
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