Method for improving signal to noise ratio

专利名称：Method for improving signal to noise ratio发明人：Meehan, Richard John申请号：EP93203368.1申请日：19931201公开号：EP0602703A2公开日：19940622

专利附图：

摘要：A method for improving the signal to noise ratio from a pair of detectors suchas geophones which each detect a noisy signal comprising a signal of interest (S) and anoise signal (N), wherein the signal of interest (S) has a different moveout across the pairof detectors from that of the noise signal (N), and the noise signal (N) from a givensource is detected at the first detector at a time Δt before the corresponding noisesignal is detected at the second detector, the method comprising delaying the noisysignal (S + N) detected at the first detector by an amount τ being greater than themoveout of the signal of interest but not more than Δt and subtracting the delayedsignal from that detected at the second detector by means of an adaptive filter so as to

minimise the power in the resultant signal The signal detected at the first detection andoptionally the resultant signal can also be delayed by an amount τ₂ and the signaldetected at the second detector is subtracted from the delayed first detector (andresultant signals) by means of an adaptive fitler so as to minimise the power in the finalsignal, the delay τ₂ being greater than the moveout of the signal of interest plus thelength of the filter but not more than Δt plus the length of the filter.

申请人：SERVICES PETROLIERS SCHLUMBERGER,SCHLUMBERGER TECHNOLOGYB.V.,SCHLUMBERGER HOLDINGS LIMITED,Schlumberger Limited

地址：42, rue Saint-Dominique F-75007 Paris FR,Carnegielaan 12 NL-2517 KM DenHaag NL,P.O. Box 71, Craigmuir Chambers Road Town, Tortola VG,Emancipatie Boulevard18 Willemstad Curaçao AN

国籍：FR,NL,VG,AN

代理机构：Hyden, Martin Douglas

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