Noise estimator for seismic exploration
AssigneeTrimble Navigation Limited
InventorsDavid G. Bird, Harold L. Longaker
Life of this patent
Estimating the term…
Abstract
A method of generating a noise estimate during seismic surveying, including measuring noise energy having a plurality of frequencies in a second time interval. The second time interval having a second start time delayed from a first start time of a first time interval during which a first plurality of reflected seismic signals are present. The plurality of reflected seismic signals having the plurality of frequencies. The second time interval approximately concurrent with the first time interval to measure one of the plurality of frequencies of the noise energy different than one of the plurality of frequencies of the first plurality of reflected seismic signals that are present. A noise estimate is generated based on the noise energy measured.
Claims12
A method of noise estimation, comprising the steps of:
- producing a first chirp signal at a varying first chirp frequency within a frequency band during a first time period, wherein the first chirp signal results in first chirp echoes, which are observed at first chirp echo frequencies during the first time period;
- taking noise measurements during the first time period at a varying first noise listening frequency within the frequency band, wherein at any point in time during the first time period, the first noise listening frequency is different from both the first chirp signal frequency and the first chirp echo frequencies at said point in time during the first time period;
- and
- generating a noise estimate based on the noise measurements.
A method of ambient noise estimation, comprising the steps of:
- producing a first chirp signal at a varying first chirp frequency within a frequency band during a first time period;
- taking a first set of ambient noise measurements at a varying first noise listening frequency within the frequency band during the first time period, wherein at any point in time during the first time period the first noise listening frequency is different from the first chirp frequency at said point in time during the first time period;
- and
- generating an estimate of ambient noise within the frequency band based on the first set of ambient noise measurements.
Dependencies are inferred from the claim text.