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Signal distortion on VHF/UHF transionospheric paths: First results from the Wideband Ionospheric Distortion Experiment
Author(s) -
Can Paul S.,
Groves Keith,
Fraser David J.,
Donnelly William J.,
Perrier Kathleen
Publication year - 2006
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 - 10.1029/2005rs003369
Subject(s) - ionosphere , physics , wideband , radar , distortion (music) , ultra high frequency , remote sensing , geology , geodesy , telecommunications , optics , computer science , geophysics , amplifier , optoelectronics , cmos
To the best of our knowledge, we report the first determination of ionospheric distortion, comprising the simultaneous characterization of both multipath and Doppler, on wideband, transionospheric VHF (158 MHz) and UHF (422 MHz) signals. The measurements took place as part of the test phase of the United Kingdom–United States Wideband Ionospheric Distortion Experiment during the evening (∼1000 UT) of 18 January 2005. This characterization has been achieved using the ALTAIR radar at the Ronald Reagan Ballistic Missile Defense Test Site on Kwajalein Atoll (9.395°N, 167.469°E (12.87°N, 237.16°E corrected geomagnetic)) in the Pacific, in conjunction with a low Earth orbiting, constant radar cross‐section, passive satellite (calibration sphere). During the period when the two‐way S 4 index was above ∼0.8 on both channels, the median coherency times were 43 and 96 ms at VHF and UHF, respectively (at 1.5σ). The corresponding median coherency bandwidths were 0.8 and 2.1 MHz.