Method for determination of differential transfer function...

Details Method for determination of differential transfer function... Method for determination of differential transfer function...

2008-03-27

2009-12-08

Keith, Jack W. (Department: 3663)

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

Reexamination Certificate

active

07630276

ABSTRACT:
Methods and apparatus for determining an accurate differential transfer function (DTF) between two closely spaced hydrophones in a dual-hydrophone configuration such that the wavefield may be properly separated into up- and down-going components are provided. The methods disclosed herein are based on the premise that the cross-correlation at a lag of zero between up- and down-going wavefields should be at a minimum for perfectly matched hydrophones. Thus, any suitable global optimization technique may be utilized to determine an accurate DTF where the zero-lag cross-correlation between up- and down-going energy is at a minimum after multiplying a particular hydrophone spectrum of the pair (depending on how the DTF was defined) with a possible DTF suggested by the global optimization technique.

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