Raytracing Tomography Analysis of Airborne GPS Travel-Time Data

Josep Maria Aparicio and Antonio Rius

Abstract:	We present an inversion procedure for the analysis of GNSS travel-time data. We focus here in applications to airborne observations of occultations, although the principle can be applied to general experimental configurations. The procedure uses a tomographic approach, and takes into account that the refractivity and its gradient are large enough so that propagation will significantly depart from a straight line. Instead, propagation is assumed to be fixed by a guess refractivity feld The inversion procedure is used to extract the difference between this guess and the actual feld. It is, in principle, able to extract, stand-alone, the 1-D field and, even, if suficient data are available, the 3-D field. In many practical cases a smaller, limited amount of data will be available, leading to a non-unique solution if processed in a stand-alone form. We thus further analyze, particularly for the 3-D case, the usefulness of the result in the framework of integration with data from other sources, as is common practice in numerical weather nalysis. We compare this procedure with the Abel ransform inversion methods.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	1127 - 1136
Cite this article:	Aparicio, Josep Maria, Rius, Antonio, "Raytracing Tomography Analysis of Airborne GPS Travel-Time Data," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 1127-1136.
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