A Beamforming Study Using Outputs From the Extended E3 Subarray at the Montana Lasa

Hartenberger, Royal A; Shumway, Robert H.

doi:10.21236/ad0820291

Cited by 3 publications

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“…Again we see that the combined effect of increasing N and simultaneously reducing A to values less than 6 km. is to produce less noise cancellation relative to A Previous work (Hartenberger and Shumway 1967) has shown that for spacing of 6 km. or more, the short-period noise at LASA is essentially incoherent.…”

Section: Methodsmentioning

confidence: 96%

The Effect of the Number and Spacing of Elements on the Efficiency of Lasa Beams

Hartenberger¹

1967

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LASA short-period recordings of 8 teleseismic earthquakes were prefiltered and beamsteered on P-wave arrivals across the 200 km. aperture to establish the relationship between sensor spacing and beam efficiency in terms of noise reduction, signal loss, and S/N ratio improvement. Results show that the combined effect of increasing the number of elements in a beam v,hile simultaneously reducing inter-sensor spacing is to produce progressively less rms noise reduction and S/N gain relative to N. The study further thows that beamforming each of the events in two ways, e.g., with 51 and 525 inputs, produces an average signal loss of ~H db. Moreover, beaming the smaller number of traces reduces rms noise and improves S/N only about 1 db less than the 525-element beam. For the 51-element beam, the minimum sensor spacing was 6 km., the distance at which the short-period noise at LASA becomes incoherent.

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Section: Methodsmentioning

confidence: 96%

The Effect of the Number and Spacing of Elements on the Efficiency of Lasa Beams

Hartenberger¹

1967

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“…A well-known formula e.g., Hartenberger and Shumway (1967), for the noise reduction obtainable by simple beamforming of an array is dB = -10 log 10…”

Section: Noise Correlation Calculationsmentioning

confidence: 99%

Seismic Array Design

Blandford¹,

Clark²

1971

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(ttauHIr rinfHIemilan »I Uli», bodr of mlfinci anrf )ndm*tn$ mnnoimiion mumt bm mntmnd M*«n m» »rmimll impoti II AMTRACTWe present a method for predicting the noise reduction by simple beamforming of an array. The method gives an accurate estimate of the known capabilities of LASA, and is applied to the design of possible new arrays. The method requires field measurement of noise and signal correlations as a function of distance. ) ABSTRACTWe present a method for predicting the noise reduction by simple beamforming of a array. The method gives an accurate estimate of the known capabilities of LASA, and is applied to the design of possible new arrays. The method requires field measurements of noise and signal correlations as a function of distance.

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Influence of Number and Spacing of Sensors on the Effectiveness of Seismic Arrays*

Hartenberger

Nostrand

1972

Geophysical Prospecting

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Résumé De préférence, les sismographes seront disposés dans un lieu sans bruit, oú il n'y aurait pas besoin de patternes. Par contre, si les bruits sont tels qu'une patterne est nécessaire, l'objectif de la patterne est d'améliorer le rapport signal/bruit et donc de rendre le signal le plus utile possible. La patterne sera dessinée en fonction des charactéristiques du signal, des charactéristiques du bruit, et de la géologie du site. Il a été démontré que, dans le sens pratique, l'opération optimum sur les données d'une patterne est représentée par le proces “delai et somme”. L'augmentation du nombre N de senseurs sur une surface donnée diminue les espacements entre les senseurs et peut augmenter la coherence entre les bruits enrigistrés aux senseurs voisins, donnant donc moins d'amélioration au rapport signal/bruit que la √N anticipée. L'augmentation du nombre de senseurs par l'augmentation proportionnelle de la surface de la patterne peut resulter en la détérioration du signal, et peut également donner moins d'amélioration que la √N Ces deux effets, ainsi que l'élément économique, combinent à limiter le nombre de senseurs qui peuvent être employés. Bien que les données sur lesquelles l'on a basé ces conclusions soient tirées de la sismologie conventionnelle, ces principes sont également valables pour l'exploration sismique et pour d'autres mesures géophysiques qui emploient des dispositifs dans lesquelles plusieurs senseurs sont requis.

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A Beamforming Study Using Outputs From the Extended E3 Subarray at the Montana Lasa

Cited by 3 publications

References 0 publications

The Effect of the Number and Spacing of Elements on the Efficiency of Lasa Beams

The Effect of the Number and Spacing of Elements on the Efficiency of Lasa Beams

Seismic Array Design

Influence of Number and Spacing of Sensors on the Effectiveness of Seismic Arrays*

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