Response of Microwave on Bare Soil Moisture and Surface Roughness by X-Band Scatterometer(Special Issue on Advances in Radar Systems)

概要

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This paper describes an individual effect of soil moisture(m_g)and surface roughness(h_<rms>)of bare soil on the back scattering coefficient(σ^0)at the X-band frequency. The study contributes to the design of an efficient microwave sensor. For this purpose, experimentally observed data was utilized to provide a composite σ^0 equation model accounting for individual effect in regression analysis. The experimental data are compared with Small Perturbation Method. It is observed that the X-band gives better agreement up to incidence angle 50゜ for HH-polarization and 60゜ for VV-polarization as compared to the C-band. The lower angles of incidence give better results than the higher angles for observing m_g at the X-band. The multiple and partial regression analyses have also carried out for predicting the dependence of scattering coefficient(σ^0)on m_g and h_<rms> more accurately. The analyses suggest that the dependence of dielectric constant(i.e., m_g)is much more significant in comparison to surface roughness at lower angles of incidence for both like polarizations. The results propose the suitable angle of incidence for observing bare surface roughness and soil moisture at the X-band. All these data can be used as a reference for satellite or spaceborne sensors.
社団法人電子情報通信学会の論文
2000-09-25