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Prediction of annual joint rain fade on EHF networks by weighted rain field selection
Author(s) -
Paulson K. S.,
Chinda I. D.
Publication year - 2015
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/2015rs005695
Subject(s) - fade , environmental science , rain rate , meteorology , radar , attenuation , fading , overhead (engineering) , rain gauge , superposition principle , joint (building) , remote sensing , computer science , algorithm , mathematics , geology , telecommunications , physics , architectural engineering , decoding methods , optics , engineering , operating system , mathematical analysis
We present a computationally efficient method to predict joint rain fade on arbitrary networks of microwave links. Methods based on synthetic rain fields composed of a superposition of rain cells have been shown to produce useful predictions of joint fade, with low computational overhead. Other methods using rain fields derived from radar systems have much higher computational overhead but provide better predictions. The proposed method combines the best features of both methods by using a small number of measured rain fields to produce annual fade predictions. Rain fields are grouped into heavy rain and light rain groups by maximum rain rate. A small selection of rain fields from each group are downscaled and fade predictions generated by pseudointegration of specific attenuation. This paper presents a method to optimize the weights used to combine the heavy rain and light rain fade predictions to yield an estimate of the average annual distribution. The algorithm presented yields estimates of average annual fade distributions with an error small compared to year‐to‐year variation, using only 0.2% of the annual data set of rain fields.