Accession Number : ADA259765


Title :   Active and Passive Remote Sensing of Ice


Descriptive Note : Final rept. 1 Oct 1988-30 Nov 1992


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


Personal Author(s) : Kong, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259765.pdf


Report Date : 26 Jan 1993


Pagination or Media Count : 75


Abstract : The theoretical approach that has been developed to interpret the polarimetric active measurements of saline ice is a random medium model using the radiative transfer theory. The ice layer is described as a host ice medium embedded with randomly distributed inhomogeneities, and the underlying sea water is considered to be a homogeneous halfspace. Multiple scattering effects are accounted for by solving the radiative transfer equations numerically. The effects of random roughness at the air - ice, and ice - water interfaces are accounted for by modifying the boundary conditions in the radiative transfer equations. Analysis of the model for reconstruction of sea ice parameters is made. An optimization approach is used for inversion. The discrepancy between the data and the results of the forward model is minimized by changing the inversion parameters according to a nonlinear programming scheme. Reconstruction of correlation lengths in the horizontal and vertical dimensions has been accomplished using the polarimetric backscattering coefficients at different angles of incidence as input data. Effects of data diversity and noise on the reconstruction of the physical parameters of sea ice from the backscattering coefficients are being investigated.


Descriptors :   *OPTICAL RADAR , *LIGHT SCATTERING , *ELECTROMAGNETIC WAVE REFLECTIONS , *SEA ICE , *OPTICAL DETECTION , IMAGE PROCESSING , NEURAL NETS , INTERACTIONS , RADIATIVE TRANSFER , REMOTE DETECTION , MICROWAVES , POLARIMETRY , BACKSCATTERING , MONTE CARLO METHOD , SNOW , SALINITY , GREENS FUNCTIONS


Subject Categories : Snow, Ice and Permafrost
      Optical Detection and Detectors
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE