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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/977

Authors: Mitchell, C. N.*
Spencer, P. S. J.*
Title: A three-dimensional time-dependent algorithm for ionospheric imaging using GPS
Issue Date: 2003
Series/Report no.: 46 (4)
URI: http://hdl.handle.net/2122/977
Keywords: ionosphere
imaging
GPS
inversion
tomography
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.
Appears in Collections:01.02.06. Instruments and techniques
05.01.05. Algorithms and implementation
Annals of Geophysics

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