(19)
(11)EP 2 284 575 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
11.04.2012 Bulletin 2012/15

(43)Date of publication A2:
16.02.2011 Bulletin 2011/07

(21)Application number: 10172496.1

(22)Date of filing:  11.08.2010
(51)International Patent Classification (IPC): 
G01V 1/00(2006.01)
G10K 9/12(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30)Priority: 12.08.2009 US 462954

(71)Applicant: PGS Geophysical AS
1366 Lysaker (NO)

(72)Inventor:
  • Tenghamn, Stig Rune Lennart
    Katy, TX 77450 (US)

(74)Representative: Lord, Michael 
Gill Jennings & Every LLP The Broadgate Tower 20 Primrose Street
London EC2A 2ES
London EC2A 2ES (GB)

  


(54)Method for generating spread spectrum driver signals for a seismic vibrator array using multiple biphase modulation operations in each driver signal chip


(57) A method for generating seismic energy for subsurface surveying include operating a first seismic vibrator above an area of the subsurface to be surveyed and operating at least a second seismic vibrator above the area substantially contemporaneously with the operating the first seismic vibrator. The first and the second vibrators each have a different selected frequency response. The first and second vibrators each is operated by a same direct sequence spread spectrum signal, wherein a different number of modulation operations for each logical value in the direct sequence spread spectrum signal is selected for each vibrator.







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