Ionospheric Imaging from a Low Earth Orbiter Tracking GPS

George A. Hajj, Rodrigo Ibanez-Meier, and Emil R. Kursinski

Abstract:	Tomographic imaging of the ionosphere is examined using singular value decomposition analysis. The interdependency of the obtainable resolution, the accuracy of the solution and the data noise is explained. A simulation is illustrated where a true 2-D ionospheric structure is generated, and a tomographic inversion of the structure is carried out. Inclusion of data taken in an occultation geometry reveals the strength that is added by these data. The effect of the ionosphere on a GPS signal as viewed by a user in space is examined. Under somewhat strong solar conditions, the absolute bending of the signal is of the order of 0.01 degrees for the Ll signal; the phase advance can be as large as 90 meters.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	1315 - 1322
Cite this article:	Hajj, George A., Ibanez-Meier, Rodrigo, Kursinski, Emil R., "Ionospheric Imaging from a Low Earth Orbiter Tracking GPS," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 1315-1322.
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