Accession Number : ADA116448

Title :   Prediction of Backscatter and Emissivity of Snow at Millimeter Wavelengths.

Descriptive Note : Final rept. Feb 78-Sep 79,

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

Personal Author(s) : Kong,Jin Au ; Shin,R T

PDF Url : ADA116448

Report Date : Jan 1980

Pagination or Media Count : 234

Abstract : In both the active and passive microwave remote sensing of snowpacks, volume scattering effects due to medium inhomogeneities play a dominant role in the determination of the radar backscattering cross sections and the brightness temperatures. Two theoretical models have been developed to characterize snowpacks: (1) a random medium with a variance, a horizontal correlation length, and a vertical correlation length and, (2) a homogeneous dielectric containing discrete scatterers. The earth terrain is then modeled as layers of such scattering media bounded by air above and a homogenous half-space below. The development of the theoretical approach is guided by the motivation that data set obtained in a field and plotted as functions of frequency, angle, and polarization must be matched with same set of parameters characterizing the same field.

Descriptors :   *RADAR SIGNATURES, *RADAR REFLECTIONS, *MILLIMETER WAVES, BACKSCATTERING, RADAR CROSS SECTIONS, MICROWAVES, SNOW, BRIGHTNESS, EMISSIVITY, RADIATIVE TRANSFER, DIELECTRIC PROPERTIES, TERRAIN, FREQUENCY RESPONSE, TEMPERATURE, FORTRAN, HOMOGENEITY, LENGTH, REMOTE DETECTORS, CORRELATION TECHNIQUES, HORIZONTAL ORIENTATION, VERTICAL ORIENTATION

Subject Categories : Snow, Ice and Permafrost
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE