Spatial decorrelation of VHF and UHF trans-ionospheric signals measured at Ascension Island

Max van de Kamp, Paul Cannon

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The effect of spatial decorrelation of signals of space-based synthetic-aperture radars by equatorial ionospheric turbulence, is studied by monitoring 150 and 400 MHz signals from LEO beacon satellites on an array of spaced antennas located on Ascension Island, and analysing the cross-correlations of the phases of the received signals. The special property of this approach is that it does not convolve the spatial fluctuations with the movement of the satellite. The geometrical component of the phase difference between antennas is accurately removed by adjusting the satellite position using the measured phases. As expected, the phase of VHF signals is much more affected by scintillation than the UHF phase. In the example given, the spatial correlation over 130 m falls to zero at VHF and 0.55 at UHF. Correlations over longer distances have been determined using a novel 'phase reconstruction' technique. In the absence of scintillation the decorrelation distance is similar to 10 km for both frequencies. With increasing scintillation, the decorrelation distance decreases to around 100 m at VHF and 300 m at UHF.
Original languageEnglish
Title of host publicationEuCAP 2009: 3rd European Conference on Antennas and Propagation
Place of PublicationNew York
PublisherIEEE
Pages3732-3736
Number of pages5
ISBN (Print)978-1-4244-4753-4
DOIs
Publication statusPublished - Mar 2009
Event3rd European Conference on Antennas and Propagation - EUCAP, 2009 - Berlin, Germany
Duration: 23 Mar 200927 Mar 2009

Conference

Conference3rd European Conference on Antennas and Propagation - EUCAP, 2009
CountryGermany
CityBerlin
Period23/03/0927/03/09

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  • Cite this

    van de Kamp, M., & Cannon, P. (2009). Spatial decorrelation of VHF and UHF trans-ionospheric signals measured at Ascension Island. In EuCAP 2009: 3rd European Conference on Antennas and Propagation (pp. 3732-3736). IEEE. https://doi.org/10.1049/cp.2009.0047