Analysis of electromagnetic properties of precipitation particle and imaging simulation of target in rainfall environment

Firstly, electromagnetic scattering model of precipitation particle is analyzed. In order to research the scattering from raindrop particle in the Ku-band and Ka-band, the fast and accurate transfer matrix method (T-matrix) is used to analyze simple spherical or ellipsoid targets. Secondly, the influence of rainfall attenuation in multi-band and different rain rate is investigated. Finally, an imaging simulation method of 3-D complex target in rainfall environment is proposed. Simulation results demonstrate the influence of precipitation attenuation must be considered in Ku-band, while the rainfall intensity is above 10 mm/h. And SAR images in Ku-band will appear a much more severe degradation, when the rain rate increases to 50 mm/h. In Ka band, it is obvious that even impact of light rain could be seen in the images. And medium or heavy intensity precipitation will make SAR images nearly or completely blurred.