Estimation of the Scattering Coefficient and Emissivity of Red Soils at X- And C Band Microwave Frequencies
Avinash Patil, D. V. Ahire* and P. R. Chaudhari
Journal Title:Journal of Chemical, Biological and physical sciences
The soil is characterized by its physical constituents like sand, silt and clay.
The electrical parameters that are important for soil are its dielectric constant, emissivity
and scattering coefficient. The dielectric constant of wet soil mainly depends on amount of
water present in it. In the present study, measurements of dielectric constant of red soil
samples are made by using automated microwave set-up operating at X-band (9.2 GHz)
and C-band (5.1 GHz) frequencies. These red soil samples are collected from two different
locations situated in the North Maharashtra and Konkan areas of Maharashtra (India). The
scattering coefficient is estimated using perturbation model for slightly rough surface for
both (VV and HH) polarization and for different angles of incidence. The values of
estimated scattering coefficient are related to constituents of the soil. Measured values of
dielectric constant are also used to estimate emissivity by using emissivity model. It is
found that the emissivity decreases with increase in angle of incidence of dry red soil. The
possible uses of this study in the design of passive and active remote sensors are discussed.