Presentation Information
[AAS14-P06]Theoretical consideration for portable doppler radar raingauges
*Masaru Inatsu1, Shiho Onomura2, Ryuta Sakaguchi5, Yuto Sampei1, Kazuki Nanko4, Atsushi Hamada3 (1.Hokkaido University, 2.Tokyo City University, 3.University of Toyama, 4.Tokyo University of Agriculture and Technology, 5.Yachiyo Engineering Co Ltd)
Keywords:
Rain observation,Moving particle simulation,Microwave
This study explored the theoretical basis for the newly developed portable doppler radar raingauge, a compact microwave radar system that detects water droplets impinging on a capsule-shaped shield. First, the design of the device was derived from voltage data obtained through both laboratory experiments and field observations. Based on this, a simple empirical method for converting the voltage data to rainfall intensity was established using statistics of high-pass-filtered signals. Next, we simulated the movement and deformation of raindrops, of which size follows a Gamma distribution, onto a hemispherical sensor surface using the Moving Particle Simulator (MPS). Furthermore, for representative drop sizes observed in the simulation, we calculated the scattering of microwaves using the Finite-Difference Time-Domain (FDTD) method. As a result, the values calculated by the MPS and FDTD methods showed consistency with the empirically derived equation, thereby supporting its utility.