Active and Passive Remote Sensing of Ice
Abstract
Fully polarimetric scattering properties of earth terrain media are studied with three-layer random medium model. The top scattering layer is modeled as an isotropic random medium which is characterized by a scalar permittivity. The middle scattering layer is modeled as an anisotropic random medium with a symmetric permittivity tensor whose optic axis can be tilted depending on the preferred alignment of the embedded scatters. The bottom layer is considered as a homogeneous half-space. Volume scattering effects of both random media are described by three-dimensional correlation functions with variances and correlation lengths corresponding to the strengths of the permittivity fluctuations and the physical sizes of the inhomogeneities, respectively. The strong fluctuations theory is used to derive the mean fields in the random media under the bilocal approximation with singularities of the dyadic Green's functions properly taken into consideration. With the discrete scatterer concept, effective permittivities of the random media are calculated by two-phase mixing formulas. Then, the distorted Born approximation is used to calculate the covariance matrix which describes the fully polarimetric scattering properties of the remotely sensed media. The polarimetric information is useful in the identification, classification, and radar image simulation of earth terrain media. Radar scattering.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1988
- Accession Number
- ADA201915
Entities
People
- Jinau Kong
Organizations
- Massachusetts Institute of Technology