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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a116448.pdf


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