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Methods for determining the position of seismic equipment, and applications of the methods

  • US 5,668,775 A
  • Filed: 09/11/1995
  • Issued: 09/16/1997
  • Est. Priority Date: 11/19/1993
  • Status: Expired due to Term
First Claim
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1. A method for determining the position of seismic equipment, especially seismic sources and seismic streamers, wherein the seismic equipment is arranged to transmit and receive acoustic signals, said method comprising the steps of:

  • generating a spread spectrum signal having an orthogonally encoded signal sequence, said spread spectrum signal having a prominent peak in an autocorrelation function thereof;

    transmitting the spread spectrum signal using acoustic transmitters provided in the seismic equipment;

    detecting the spread spectrum signal transmitted by said acoustic transmitters using acoustic receivers in the seismic equipment and adapted for the detection of the spread spectrum signal;

    cross-correlating the spread spectrum signal detected by said acoustic receivers with the orthogonally encoded signal sequence of the spread spectrum signal;

    determining a time difference between detection of the spread spectrum signal received by said acoustic receivers on the basis of a prominent peak in a cross-correlation function of the spread spectrum signal as received by each acoustic receiver;

    determining a distance between said acoustic transmitters and said acoustic receivers on the basis of said time difference and a known distance between said acoustic receivers; and

    forming on the basis of the distance determined during said step of determining a distance, a spatial network indicative of the seismic equipment'"'"'s exact geometrical configuration, the location of at least one point in said spatial network being defined by relating the network to at least one conventionally determined geographical position.

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