Wave-signal-processing system with a two-dimensional recursive d

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367 43, 367123, G06F 1531, G01V 128

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042778344

ABSTRACT:
A system for determining the location of a seismic wave source in a homogeneous medium (the soil) comprises a linear array of equispaced sensors sampled by respective pulse extractors in turn feeding a plurality of cascaded two-dimensional recursive digital filters which act as phase shifters estimating in small or incremental steps the magnitude of the wave field away from the sensor array. The output signals of the sensors are sampled at a rate equal to the ratio of the distance between the sensors and the wave velocity in the homogeneous medium, thereby giving rise to samples distributed in a single quadrant of the space-time domain. An attenuator connected in series with the phase-shifting filters damps frequency components outside the rotated quadrant, while an equalizer connected in cascade with the attenuator ensures a global linear response thereof. The location of the wave source is determined in the output of a filter-chain portion through a spike identifying the onset of wave generation and the sensor closest to the source; the source is located at a distance from the sensor array equal to the product of the number of filters in the chain portion producing the spike and the average magnitude of the incremental steps of distance at which the magnitude of the wave field is estimated by the filters.

REFERENCES:
patent: 3161851 (1964-12-01), Voglis et al.
patent: 3550073 (1970-12-01), Foster et al.
patent: 3858168 (1974-12-01), Barr, Jr. et al.

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