J. KIMS Technol Search


Journal of the Korea Institute of Military Science and Technology 2007;10(3):43-50.
Influence of the Geoacoustic Parameters of Seabed Appearing in the Broadband Interference Pattern by Moving Targets
Joo-Young Hahn, Hyeong-Uk Lee, Bong-Ki Lee
이동 표적에 의한 광대역 간섭패턴의 지음향 인자 영향
한주영, 이형욱, 이봉기
A range-frequency interference pattern is analyzed in the course of the propagation of ship noise in shallow water. It has been shown to exhibit striated bands of intensity maxima and minima in the spectrogram. The slope of the striations is an invariant of the modal interference and is described by a waveguide invariant parameter $eta$. It turns out that this interference pattern is useful for identifying the physical properties of the waveguide such as seabed properties. In this article, the interference pattern is analyzed using image processing techniques to produce the distribution of the beta and the effects of sediment types and geoacoustic parameters on beta distribution are examined and characterized by moments of the distributions.
Key Words: Ship-Radiated Noise, Range-Frequency Domain Spectrogram, Striation Pattern, Mode Interference, Geoacoustic Parameters
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