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Off-shore seismic prospection method using a coded vibratory signal and a device for implementing this method

  • US 4,780,856 A
  • Filed: 10/30/1986
  • Issued: 10/25/1988
  • Est. Priority Date: 10/30/1985
  • Status: Expired due to Fees
First Claim
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1. A marine seismic prospection method including transmission, by at least one vibratory source towed by a ship moving continuously in a profile plane to be studied, of repetitive sequences of acoustic vibrations modulated non-repetitively during each of said sequencesreception of the acoustic waves reflected back by the reflectors, recording of acoustic signals corresponding to the received acoustic waves received and processing said signals so as to determine the position of said reflectors, wherein the transmission includes a succession of linked sequences each formed of a periodic carrier signal phase modulated by a pseudo-random binary coded signal and the processing of the acoustic signals received includes correlation of the signals received during a time equal to that of several successive sequence time periods with a single sequence of coded signals, so as to obtain correlation peaks at time intervals less than or equal to the repetition period of the successive transmission sequences.

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