Pulse Timedelay Method for Geophysical Tomography

Brad L. Carlson, Constantine Balanis

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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 languageEnglish (US)
Pages (from-to)511-517
Number of pages7
JournalIEEE Transactions on Geoscience and Remote Sensing
Issue number5
StatePublished - Sep 1988

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)


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