The use of measured RF power signals to evaluate feasibility of inverse methods to retrieve refractivity parameters
2006
Radio wave propagation over sea paths is influenced by the local meteorological condition at the atmospheric layer near
the surface, especially during ducts. Duct condition can be determined by measurements of local meteorological
parameters, by weather forecast models or by using inverse methods. In order to evaluate the feasibility of using inverse
methods to retrieve the refractivity profiles a measurement of RF signals and meteorological parameters were carried
out at a test site in the Baltic. During the measurements, signal power from two broadcast antennas, one at Visby and
one at Vastervik, were received at Musko, an island south of Stockholm. The measurements were performed during the
summer 2005 and the data was used to test the software package for inversion methods, SAGA (Seismo Acoustic
inversion using Genetic Algorithms, by Peter Gerstoft UCSD, US). Refractivity profiles retrieved by SAGA were
compared with the refractivity profiles calculated from measured parameters, during parts of the experiment, from
rocket sounding, radio sounding, local meteorological measurements using bulk model calculations, and also obtained
by the Swedish operational weather forecast model HIRLAM. Surface based duct height are predicted in relative many
situations even though the number of frequencies or antennas height has to be increased to diminish the ambiguous of
the refractive index profile.
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