A three-dimensional time-dependent algorithm for ionospheric imaging using GPS

C. N. Mitchell, P. S. J. Spencer

Abstract


Global Positioning System (GPS) satellite receivers provide a world-wide network of phase and group delay
measurements. The combination of two-frequency measurements can be used to derive the integral of the electron
concentration along each satellite-to-receiver path, a parameter known as the Total Electron Content (TEC). At this
stage these slant TEC data are diffi cult to interpret as they originate from a combination of a temporally changing
ionosphere and spatially changing observation geometry. In this paper TEC data are inverted to evaluate the underlying
distribution and time evolution of electron concentration. Accordingly, a new three-dimensional, time-dependent
algorithm is presented here for imaging ionospheric electron concentration using GPS signals. The inversion results
in a three-dimensional movie rather than a static image of the electron-concentration distribution. The technique is
demonstrated using simulated ground-based GPS data from actual measurement geometry over Europe.

Keywords


ionosphere;imaging;GPS;inversion;tomography

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References


DOI: https://doi.org/10.4401/ag-4373
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X