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Variation of probability of sonar detection by internal waves in the South Western Sea of Jeju Island

TitleVariation of probability of sonar detection by internal waves in the South Western Sea of Jeju Island
Publication TypeJournal Article
Year of Publication2018
AuthorsAn S., Park J., Choo Y., Seong W.
Date Published2018/01
Type of ArticleArticle
ISBN Number1225-4428
Accession NumberWOS:000429325700004
Keywordsacoustics; internal; PPD (Predictive Probability of Detection); propagation; SAVEX15 (Shallow Water Acoustic Variability EXperiment 2015); TL (Transmission Loss); waves

Based on the measured data in the south western sea of Jeju Island during the SAVEX15(Shallow Water Acoustic Variability EXperiment 2015), the effect of internal waves on the PPD (Predictive Probability of Detection) of a sonar system was analyzed. The southern west sea of Jeju Island has complex flows due to internal waves and USC (Underwater Sound Channel). In this paper, sonar performance is predicted by probabilistic approach. The LFM (Linear Frequency Modulation) and MLS (Maximum Length Sequence) signals of 11 kHz 31 kHz band of SAVEX15 data were processed to calculate the TL (Transmission Loss) and NL (Noise Level) at a distance of approximately 2.8 km from the source and the receiver. The PDF (Probability Density Function) of TL and NL is convoluted to obtain the PDF of the SE (Signal Excess) and the PPD according to the depth of the source and receiver is calculated. Analysis of the changes in the PPD over time when there are internal waves such as soliton packet and internal tide has confirmed that the PPD value is affected by different aspects.

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