Accession Number : ADA193307

Title :   Active and Passive Remote Sensing of Ice.

Descriptive Note : Semi-annual progress rept. 1 Aug 87-31 Jan 88,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Kong, Jin A.

Report Date : 31 JAN 1988

Pagination or Media Count : 13

Abstract : Volume scattering effects of snow-covered sea ice are studied with a three-layer random medium model for microwave remote sensing. The strong fluctuation theory and the bilocal approximation are applied to calculate the effective permittivities for snow and sea ice. Remote sensing of sea ice is studied with the two-layer random medium model where a correlation function is used to characterize the randomly fluctuating part of the permittivity. A systematic approach for the identification of terrain media is developed using the optimum polarimetric classifier. The covariance matrices for various terrain cover are computed from theoretical models of random medium by evaluating the full polarimetric scattering matrix elements. The Mueller matrix and polarization covariance matrix are described for polarimetric radar systems. The clutter is modelled by a layer of random permittivity, described by a three-dimensional correlation function, with variance, and horizontal and vertical correlation lengths. Electromagnetic waves scattering from a randomly perturbed periodic surface is solved using the Extended Boundary Condition method. We have also derived a general mixing formula for discrete scatterers immersed in a host medium.

Descriptors :   *ELECTROMAGNETIC SCATTERING, *RADAR EQUIPMENT, *SEA ICE, BOUNDARIES, CORRELATION, COVARIANCE, DIELECTRIC PROPERTIES, ELECTROMAGNETIC RADIATION, FORMULATIONS, FUNCTIONS(MATHEMATICS), HORIZONTAL ORIENTATION, ICE, IDENTIFICATION, LAYERS, LENGTH, MATRICES(MATHEMATICS), MEDIA, MICROWAVES, MIXING, MODELS, PASSIVE SYSTEMS, PERTURBATIONS, POLARIMETRY, REMOTE DETECTORS, SCATTERING, SNOW, SNOW COVER, SURFACES, TERRAIN, THEORY, THREE DIMENSIONAL, VARIATIONS, VERTICAL ORIENTATION, VOLUME, RADAR, AIRBORNE.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE