Attenuation and reflection of radio waves by a melting layer of precipitation
作者:
W.Klaassen,
期刊:
IEE Proceedings H (Microwaves, Antennas and Propagation)
(IET Available online 1990)
卷期:
Volume 137,
issue 1
页码: 39-44
年代: 1990
DOI:10.1049/ip-h-2.1990.0007
出版商: IEE
数据来源: IET
摘要:
Attenuation and reflection of a melting layer are calculated using a meteorological model. The model employs a new scheme for the calculation of the dielectric properties of melting ice particles with densities ranging from those of loose snow to hail, and a new scheme for calculating the melting rate is employed. The input parameters are derived from high resolution Doppler radar data and provide a data set for statistical analysis. Statistical relations were derived for attenuation in the melting layer based on measurements made with a surface rain gauge, a radar (with and without a polarisation facility), and a lower frequency satellite link. It was found that the specific attenuation of melting snow surpasses the value of rain because of the larger size and particle number density during melting, the attenuation within the melting layer increasing with its reflection. In stratiform precipitation, the attenuation in the melting layer is found to increase only slightly with frequency. The reflection in the melting layer decreases with the frequency of the radio waves in such a way that a bright band is only observed for frequencies below 20 GHz.
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