Experimental Study on the Impact of Seasonal Sound Speed Variability on Signal Detection Range in Arabian Sea

Defence science journal

article

Elizabeth Shani N X¹  Nimmi R Nair²  RP Raju²  Sajeev R¹ 

[1] Department of Physical Oceanography, School of Marine Science, Cochin University of Science and Technology;DRDO - Naval Physical and Oceanographic Laboratory

关键词: Ambient noise;    Indian ocean;    Seasonal variability;    Signal detection range;    Transmission loss modeling;   

DOI  :  10.14429/dsj.72.17756

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Temporal variability of Signal Detection Range (SDR) with respect to measured noise level and sound speed is examined. An N x 2D acoustic model which included bathymetric variations, was used to study detection ranges for an area in Arabian Sea. Azimuthal and seasonal SDR at octave bands within 500 Hz were determined at different receiver depths. Study shows that seasonal change in sound speed profile resulted in high SDR and noise level in winter at the location. Study also confirms the significant seasonal difference in detection range corresponds to the cut off frequency at 160 Hz. Detection range for a receiver at a depth 40 m is observed to be high across the azimuth and seasons of study.

【 授权许可】

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