Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/977
AuthorsMitchell, C. N.* 
Spencer, P. S. J.* 
TitleA three-dimensional time-dependent algorithm for ionospheric imaging using GPS
Issue Date2003
Series/Report no.46 (4)
URIhttp://hdl.handle.net/2122/977
Keywordsionosphere
imaging
GPS
inversion
tomography
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques 
05. General::05.01. Computational geophysics::05.01.05. Algorithms and implementation 
AbstractGlobal 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:Annals of Geophysics

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