Determination of the bearing from a geophone to a seismic...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science

Reexamination Certificate

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Details

Type

Reexamination Certificate

Status

active

Patent number

07835867

Description

ABSTRACT:
Techniques are disclosed for determining the bearing from a three-axis geophone to a seismic source, such as a person or other man-made seismic source. In one embodiment, the techniques are implemented as a method that includes receiving outputs from a three-axis geophone (x axis, y axis and z axis outputs), computing a magnitude signal based on the x and y axis outputs, determining locations of each local peak in the magnitude signal, computing a bearing estimate for each peak, and computing a median of the bearing estimates. The resulting median bearing is an estimate of the bearing from the geophone to a target seismic source. In one such case, computing the magnitude signal based on the x and y axis outputs is performed in response to detecting the target seismic source in the phase-shifted z axis output.

REFERENCES:
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patent: 6076045 (2000-06-01), Naville
patent: 6690321 (2004-02-01), Blatt
patent: 7034716 (2006-04-01), Succi et al.
patent: 7154275 (2006-12-01), Zank et al.
“Source Location and Tracking Capability of a Small Seismic Array”, CRREL Report 96-8, Jun. 1996.
“A Three Channel Geophone Amplifier”, printed Aug. 26, 2008 from http://www.vaxman.de/projects/geophon—amplifier/geophon—amplifier.html.
“Footstep Detection and Tracking”, Succi, et al, Proceedings of SPIE vol. 4393 (2001).

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