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Proceedings Paper

The use of measured RF power signals to evaluate feasibility of inverse methods to retrieve refractivity parameters
Author(s): Ove K. S. Gustafsson; Gunnar Eriksson; Peter Holm; Åsa Waern; Pontus von Schoenberg; Lennart Thaning; Melker Nordstrand; Rolf Persson
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Paper Abstract

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.

Paper Details

Date Published: 13 October 2006
PDF: 15 pages
Proc. SPIE 6360, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2006, 636001 (13 October 2006); doi: 10.1117/12.689840
Show Author Affiliations
Ove K. S. Gustafsson, Swedish Defence Research Agency (Sweden)
Gunnar Eriksson, Swedish Defence Research Agency (Sweden)
Peter Holm, Swedish Defence Research Agency (Sweden)
Åsa Waern, Swedish Defence Research Agency (Sweden)
Pontus von Schoenberg, Swedish Defence Research Agency (Sweden)
Lennart Thaning, Swedish Defence Research Agency (Sweden)
Melker Nordstrand, Swedish Defence Research Agency (Sweden)
Rolf Persson, Swedish Defence Research Agency (Sweden)

Published in SPIE Proceedings Vol. 6360:
Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2006
Charles R. Bostater; Xavier Neyt; Stelios P. Mertikas; Miguel Vélez-Reyes, Editor(s)

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