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Attenuation rates of coastal radar signals at 25 MHz
Author(s) -
Lyons R. S.,
Barrick D. E.
Publication year - 1984
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 - 10.1029/rs019i001p00319
Subject(s) - attenuation , atmospheric duct , radar , range (aeronautics) , environmental science , troposphere , limiting , remote sensing , signal (programming language) , acoustics , geology , physics , atmospheric sciences , meteorology , telecommunications , optics , atmosphere (unit) , materials science , computer science , mechanical engineering , engineering , composite material , programming language
The attenuation rate of the ground wave signal with range is a factor limiting the performance of coastal radars. We show that observed attenuation rates are less than theoretically predicted rates at 25 MHz. This result, contrary to earlier findings at lower frequencies, suggests the onset of tropospheric ducting above 20 MHz. The attenuation rates for various sea states and distances are tabulated to allow estimates of system performance near 25 MHz.