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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.: | 4/46 (2003) | URI: | http://hdl.handle.net/2122/977 | Keywords: | ionosphere imaging GPS inversion tomography |
Subject Classification: | 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques 05. General::05.01. Computational geophysics::05.01.05. Algorithms and implementation |
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: | Annals of Geophysics |
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