Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Patent
1997-04-09
2000-02-08
Oda, Christine K.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
G01V 100
Patent
active
060236582
ABSTRACT:
Methods and apparatus are described for identifying and removing noise from borehole telemetry signals. A spectrum of the signal and of an approximated noise-free spectrum of the signals are generated and compared so as to identify frequencies at which noise occurs. The approximated spectrum is preferably generated by an averaging or integrating process which essentially results in a smoothened variant of the signal spectrum. The comparison includes dividing the signal spectrum by the approximated spectrum, and setting a threshold in the resulting dimensionless peak spectrum. The remaining parts of the peak spectrum are identified as noise. The dimensionless spectrum is found to have major advantages when having to identify noise frequencies.
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Jeffery Brigitte L.
Lee Peter Y.
Oda Christine K.
Schlumberger Technology Corporation
Taylor Victor J.
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