Low Frequency Broad Band Acoustic Propagation in Andaman Sea

  • Nimmi R. Nair DRDO-Naval Physical and Oceanographic Laboratory, Kochi
  • R. Suganthbalaji DRDO-Naval Physical and Oceanographic Laboratory, Kochi
  • Elizabeth Shani N. X. DRDO-Naval Physical and Oceanographic Laboratory, Kochi
  • P. V. Nair DRDO-Naval Physical and Oceanographic Laboratory, Kochi
Keywords: Low frequency underwater propagation, Indian Ocean, Cut off frequency

Abstract

During November 2017, an active source seismic survey was performed in Andaman sea to study the acoustic propagation characteristics. High power low frequency acoustic signals generated by 20-air gun array onboard ORV Samudra Ratnagar were recorded from INS Sagardhwani at four different depths within 8 km ranges in shallow and deep waters. Low frequency sound levels were estimated using root mean square and power spectral values. Amplitude levels were analysed with respect to arrival time variation with frequency and is presented.

Author Biographies

Nimmi R. Nair, DRDO-Naval Physical and Oceanographic Laboratory, Kochi

DRDO-Naval Physical and Oceanographic Laboratory, Kochi

R. Suganthbalaji, DRDO-Naval Physical and Oceanographic Laboratory, Kochi

DRDO-Naval Physical and Oceanographic Laboratory, Kochi 

Elizabeth Shani N. X., DRDO-Naval Physical and Oceanographic Laboratory, Kochi

DRDO-Naval Physical and Oceanographic Laboratory, Kochi

P. V. Nair, DRDO-Naval Physical and Oceanographic Laboratory, Kochi

DRDO-Naval Physical and Oceanographic Laboratory, Kochi

Published
2019-03-06
How to Cite
NairN., SuganthbalajiR., N. X.E., & NairP. (2019). Low Frequency Broad Band Acoustic Propagation in Andaman Sea. Defence Science Journal, 69(2), 127-130. https://doi.org/10.14429/dsj.69.14224
Section
Special Issue Papers