Computer Error Analysis of Rainfall Rates Measured by a C-Band Dual-Polarization Radar

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概要

• 論文の詳細を見る

• Radar signals fluctuate because of the incoherent scattering of raindrops. Dual-polarization radar estimates rainfall rates from differential reflectivity (Z_<DR>) and horizontal reflectivity (Z_H). Here, Z_<DR> and Z_H are extracted from fluctuating radar signals by averaging. Therefore, instrumentally measured Z_<DR> and Z_H always have errors, so that estimated rainfall rates also have errors. This paper evaluates rainfall rate errors caused by signal fluctuation. Computer simulation based on a physical raindrop model is used to investigate the standard deviation of rainfall rate. The simulation considers acquisition time, and uses both simultaneous and alternate sampling of horizontal and vertical polarizations for square law and logarithmic estimators at various rainfall rates and elevation angles. When measuring rainfall rates that range from 1.0 to 10.0 mm/h with the alternate sampling method, using a logarithmic estimator at a relatively large elevation angle, the estimated rainfall rates have significant errors. The simultaneous sampling method is effective in reducing these errors.

• 一般社団法人電子情報通信学会の論文
• 1994-09-25

著者

• Ohsaki Yuji

  Okinawa Radio Observatory Communications Research Laboratory

関連論文

• Adaptive Determination of Maximum Diameter of Raindrops from Z_ (Special Issue on Weather Radar Technology)
• Computer Error Analysis of Rainfall Rates Measured by a C-Band Dual-Polarization Radar

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