Next: Introduction
A New Iterative Algorithm for Ionospheric Tomography
Eric Sutton and Helen Na
Abstract:
An ionospheric tomography system consists of a satellite and several
ground stations located in a line under the path of the satellite.
The data collected at the ground stations are the integrals of
electron density along many paths between the ground stations and the
satellite. From this data an image of electron density in the plane
defined by the satellite orbit and the ground stations can be
reconstructed using tomographic techniques. However, the data
obtained from an ionospheric tomography system is not complete, so
a priori information must be used in the reconstruction algorithm in
order to obtain a useful solution. The Orthogonal Decomposition
Algorithm (ODA) provides a way of incorporating a priori information
into the reconstruction. However, due to problems with numerical
conditioning, ODA by itself does not yield a solution. This paper
presents a new algorithm for ionospheric tomography reconstruction
called the Recursive Correction Method (RCM). RCM is a fast, stable,
iterative algorithm that takes advantage of the special structure of
the ionospheric tomography problem. This paper will also present
convergence analysis of RCM, comparison between RCM and Algebraic
Reconstruction Technique (ART), and an example using simulated data.
4401B EB
Fri Oct 20 15:39:03 CDT 1995