Accession Number : AD0679358

Title :   PHASE QUADRATURE COMPONENTS OF THE MICROWAVE SCATTERED FIELD IN A SHORT TROPOSPHERIC PATH AS RELATED TO THE METEOROLOGICAL PARAMETERS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH GEO-ASTRO PHYSICS LAB

Personal Author(s) : Beard,C. I. ; Kreiss,W. T. ; Tank,W. G.

Report Date : SEP 1968

Pagination or Media Count : 24

Abstract : A microwave propagation experiment was established on a line-of-sight path equipped with extensive meteorological instrumentation to show quantitatively the effect of the atmospheric scatterers on the microwave statistics. A particular microwave technique is used at 10.4 GHz which resolves the received microwave field into its phase quadrature components to provide the statistics of the incoherent scattered field directly, since these are the quantities sensitive to the atmospheric fluctuations. The effect of the sphericity of the wavefronts over the scatterers provides an additional descriptive parameter. The usefulness of the technique in scattering work is to pin down the statistical model of the scattered field, e.g., over a 3.57 km path it shows that the incoherent scattered field lies almost entirely at a phase angle of plus or minus 90 degrees to the coherent field and is also normally distributed. The meteorological instrumentation is unique in that integrated measurements are made of the defining refractivity parameters; i.e., (1) an infrared transmissometer operating in absorption bands of oxygen and water vapor at 1.27 and 1.16 microns, respectively, measures integrated dry air and water vapor partial densities, and (2) a microwave transmissometer operating in the 22.2 GHz water vapor band measures the integrated water vapor density-to-temperature ratio. Such integrated data admit to direct comparison with the 10.4 GHz near field scattering effects. More conventional meteorological instrumentation is also utilized. (Author)

Descriptors :   (*MICROWAVES, SCATTERING), STATISTICAL ANALYSIS, PROPAGATION, RADIO WAVES, ATMOSPHERIC MOTION, POWER SPECTRA, INFRARED SPECTRA, METEOROLOGICAL PHENOMENA

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE