Method and apparatus for subsoil exploration including emission

Details Method and apparatus for subsoil exploration including emission Method and apparatus for subsoil exploration including emission

1993-04-14

1994-04-19

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 41, G01V 136

Patent

active

053052854

ABSTRACT:
Seismic impulses irregularly distributed in time (according to a random or a pseudorandom code for example) are transmitted into the soil, and the direct waves and those reflected by the subsoil discontinuities are picked-up by a reception system (G). The frequency spectrum of the emitted and the received signals is divided into several bands, and the components of the signals in each one of the bands are reduced to elementary signals indicating the change of sign thereof (sign bit) and are recorded. Cross-correlation of the elementary signals respectively associated with the emitted and the received signals and stacking of the cross-correlation products associated with each sensor are carried out thereafter for each sensor of the reception system, and seismic sections very comparable to what would be obtained by digitizing the signals received with full precision, as in conventional methods, are achieved with the obtained stacks.

REFERENCES:
patent: 3327805 (1967-06-01), Glazier et al.
patent: 3622970 (1971-11-01), Sayous et al.
patent: 3952280 (1974-01-01), Altes
patent: 4293935 (1981-10-01), Gros et al.
patent: 4346461 (1982-08-01), Muir
patent: 4543632 (1985-09-01), Ergas et al.
patent: 4926391 (1990-05-01), Rector et al.
Journal of the Acoustical Society of America, vol. 36, No. 1, Jan. 1964, pp. 121-139, New York, US; W. B. Allen et al.: "Digital compressed-time correlators and matched filters for active sonar".

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