J4 ›› 2009, Vol. 39 ›› Issue (6): 1146-1149.

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Seismic Vibrator Signal Modulating Based on Aperiodic Pseudorandom Sequence

WANG Zhong-ren, GAO Jian, GENG Liang   

  1. College of Instrumentation and Electrical Engineering/Key Lab of GeoExploration and |Instrumentation|Ministry of Education|Jilin University|Changchun 130026|China
  • Received:2008-12-24 Online:2009-11-26 Published:2009-11-26

Abstract:

A method to modulate seismic vibrator signals was proposed based on aperiodic pseudorandom sequences given a definition of ternary aperiodic pseudorandom sequence. Compared with binary m-sequence modulation, this method doesn’t waste seismic data resources.Generally,a ternary aperiodic pseudorandom sequence has smaller ratio of side lobe to main lobe than a binary one. The simulation results show that the correlation noises in response section to the seismic vibrator signal modulated by ternary aperiodic pseudorandom sequence with smaller ratio of side lobe to main lobe are obviously weaker than that by binary aperiodic pseudorandom sequence with the same length.

Key words: aperiodic pseudorandom sequences, correlation noise, seismic vibrator, signal modulating, seismic prospecting

CLC Number: 

  • P631
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