Geotomography methods are presented for reconstructions of index of refraction distributions from timedelay measurements. Two versions of the algebraic reconstruction technique (ART) are compared to the conjugate residual (CR) method with Lagrange multiplier conditioning. The conjugate residual algorithm provides the most accurate reconstructions. A ray bending model to account for refraction is also used in the reconstructions. Modifications are made in the algorithm to simplify its use and to improve the convergence stability. Two image filters, the two-group minimum variance partition-average (MVP2-AVE) and the selective smoothing (SS), are used in succession and some of the limitations of each filter are eliminated. This improves the implementation of the filters and the accuracy of the reconstructions.
|Original language||English (US)|
|Number of pages||7|
|Journal||IEEE Transactions on Geoscience and Remote Sensing|
|State||Published - Sep 1988|
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Earth and Planetary Sciences(all)