Accession Number : ADA301557

Title :   Measurements of Natural Surfaces at Millimeter WaveLengths.

Descriptive Note : Final rept. 1 Apr 92-31 Mar 95,

Corporate Author : MASSACHUSETTS UNIV AMHERST MICROWAVE REMOTE SENSING LAB

Personal Author(s) : McIntosh, Robert E. ; Mead, James B.

PDF Url : ADA301557

Report Date : 16 MAY 1995

Pagination or Media Count : 7

Abstract : During the three years covered by this contract, we achieved a number of important results in millimeter wave radar hardware development, measurements, and data analysis. Important results include demonstrating the equivalence of coherent and noncoherent polarimetric measurement techniques; the development of a Kalman filter to improve the convergence of noncoherent polarimetric measurements; the development of a single antenna 95 GHz polarimetric radar; measurement of the polarimetric response of deciduous and coniferous trees at 35, 95 and 225 GHz; and development of polarimetric scattering models for anisotropic scattering volumes. Among the most significant accomplishments of the last three years were the snow measurement campaigns of 1992-1994 which resulted in a large volume of fully polarimetric data at 35, 95 and 225 GHz. In addition to yielding long records of the diurnal variation in radar cross section, these data showed for the first time that anisotropy in the snow pack has a major impact on the polarimetric response throughout the millimeter head. Finally, we have initiated a significant effort to archive all polarimetric data gathered during this project in the FINRACS database.

Descriptors :   *RADAR CROSS SECTIONS, *RADAR REFLECTIONS, *EARTH SURFACE, DATA BASES, GROUND LEVEL, MEASUREMENT, METHODOLOGY, KALMAN FILTERING, MILLIMETER WAVES, POLARIMETRY, ELECTROMAGNETIC SCATTERING, INCOHERENCE, SNOW, ANISOTROPY, EXTREMELY HIGH FREQUENCY, FREQUENCY RESPONSE.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE