Accession Number : ADP006129

Title :   FM-CW Radar Remote Sensing of Hydrometeors,

Corporate Author : TECHNISCHE HOGESCHOOL DELFT (NETHERLANDS)

Personal Author(s) : Ligthart, L. P. ; Van Sinttruyen, J. S.

Report Date : MAY 1987

Pagination or Media Count : 15

Abstract : In order to investigate phenomena influencing co-polar attenuation and cross-polar discrimination along earth-space satellite paths and terrestrial radio links at frequencies above 10 GHz, the number density, geometry, and orientation of hydrometeors (rain, snow, hail, melting particles etc.) along the path have to be characterized. This paper describes the modelling of the melting process, the dielectric properties of melting particles, and fall velocity behavior of hydrometeors for Doppler velocity computation with vertically pointing radars. Attention is paid to backward scattering of ellipsoidal hydrometeors for radar polarimetry computations at arbitrary elevation angles, and to forward scattering of spherical hydrometeors for attenuation computations at high frequencies. The multi-parameter FM-CW radar systems of Delft University of Technology is able to measure the polarization properties and Doppler velocity spectra of hydrometeors with high resolution in range and reflectivity level. Preliminary results obtained with this radar system are shown, indicating the capabilities of combined Doppler- and polarimetry measurements for classification of hydrometers along a satellite path.

Descriptors :   *RADAR REFLECTIONS, *HYDROMETEORS, POLARIMETRY, POLARIZATION, SUPERHIGH FREQUENCY, DOPPLER SYSTEMS, RADIATION ATTENUATION, SYMPOSIA, NETHERLANDS.

Subject Categories : Radiofrequency Wave Propagation
      Active & Passive Radar Detection & Equipment
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE