Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1997-05-21
1998-05-26
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
G01V 138
Patent
active
057577226
ABSTRACT:
A high-order, polynomial regression curve is fitted to a global set of first-arrival pick times as a function of the nominal ranges between a plurality of acoustic sources having known geodetic coordinates and a plurality of acoustic detectors whose coordinates are imperfectly known. The polynomial is applied to the pick times to provide pick time distances with the vertical velocity gradient removed. The known source coordinates, the nominal detector coordinates and the pick time distances are combined to provide a quadratic surface to provide a common data block containing the coefficients for modeling the lateral velocity gradient. Using the so-determined coefficients, the imperfectly-known detector positions are iteratively updated using the Helmert blocking technique.
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Cross, P.A.; Advanced Least Squares Applied To Position-Fixing, Working Paper No. 6, North East London Polytechnic, Department of Land Surveying, Apr. 1983, pp. 115-124.
Knox William A.
Lobo Ian J.
Western Atlas International Inc.
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