Pulse Timedelay Method for Geophysical Tomography

Brad L. Carlson; Constantine Balanis

doi:10.1109/36.7675

Pulse Timedelay Method for Geophysical Tomography

Brad L. Carlson, Constantine Balanis

Electrical Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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)
Pages (from-to)	511-517
Number of pages	7
Journal	IEEE Transactions on Geoscience and Remote Sensing
Volume	26
Issue number	5
DOIs	https://doi.org/10.1109/36.7675
State	Published - Sep 1988

ASJC Scopus subject areas

Electrical and Electronic Engineering
Earth and Planetary Sciences(all)

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10.1109/36.7675

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@article{1867a5d61985414cba49d423207b07b8,

title = "Pulse Timedelay Method for Geophysical Tomography",

abstract = "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.",

author = "Carlson, {Brad L.} and Constantine Balanis",

note = "Funding Information: Manuscript received October 18, 1987; revised May 17, 1988. This work was supported by the U.S. Army Research Office under Contract DAAG29-85-K-0045. B. L. Carlson was with the Department of Electrical and Computer Engineering, Arizona State University, Tempe, A2 85287. He is now with Aerospace Corp., Los Angeles, CA 90009. C. A. Balanis is with the Department of Electrical and Computer Engineering, Arizona State University, Tempe, AZ 85287. IEEE Log Number 8822334.",

year = "1988",

month = sep,

doi = "10.1109/36.7675",

language = "English (US)",

volume = "26",

pages = "511--517",

journal = "IEEE Transactions on Geoscience and Remote Sensing",

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publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "5",

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T1 - Pulse Timedelay Method for Geophysical Tomography

AU - Carlson, Brad L.

AU - Balanis, Constantine

N1 - Funding Information: Manuscript received October 18, 1987; revised May 17, 1988. This work was supported by the U.S. Army Research Office under Contract DAAG29-85-K-0045. B. L. Carlson was with the Department of Electrical and Computer Engineering, Arizona State University, Tempe, A2 85287. He is now with Aerospace Corp., Los Angeles, CA 90009. C. A. Balanis is with the Department of Electrical and Computer Engineering, Arizona State University, Tempe, AZ 85287. IEEE Log Number 8822334.

PY - 1988/9

Y1 - 1988/9

N2 - 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.

AB - 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.

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JO - IEEE Transactions on Geoscience and Remote Sensing

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IS - 5

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Pulse Timedelay Method for Geophysical Tomography

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