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 10 km for both frequencies; with increasing scintillation, it decreases to around 100 m at VHF and 300 m at UHF.
Original languageEnglish
Title of host publicationIET 11th International Conference on Ionospheric Radio Systems and Techniques, IRST 2009
Place of PublicationStevenage
PublisherInstitution of Engineering and Technology
Pages117-121
Number of pages5
Volume2009
ISBN (Print)9781849191234
DOIs
Publication statusPublished - 2009
EventIET 11th International Conference on Ionospheric Radio Systems and Techniques, IRST 2009, April 28, 2009 - April 30, 2009 - Edinburgh, UK United Kingdom
Duration: 1 Jan 2009 → …

Publication series

NameIET Conference Publications
PublisherInstitution of Engineering and Technology

Conference

ConferenceIET 11th International Conference on Ionospheric Radio Systems and Techniques, IRST 2009, April 28, 2009 - April 30, 2009
CountryUK United Kingdom
CityEdinburgh
Period1/01/09 → …

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    van de Kamp, M., & Cannon, P. (2009). Spatial decorrelation of VHF and UHF trans-ionospheric signals measured at Ascension Island. In IET 11th International Conference on Ionospheric Radio Systems and Techniques, IRST 2009 (Vol. 2009, pp. 117-121). (IET Conference Publications). Institution of Engineering and Technology. https://doi.org/10.1049/cp.2009.0047