Passive Ranging of Tonal Sources in Shallow Water Using the Waveguide Invariant

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Date

2017

Authors

Young, Andrew

Advisors

Krolik, Jeffrey L
Nolte, Loren W

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Abstract

Shallow water, coastal regions with high volumes of shipping traffic provide an excellent opportunity to passively characterize the ocean acoustic propagation environment. In this paper, a hybrid maximum-likelihood method is presented for estimating the value of the waveguide invariant parameter, $\beta$, which succinctly characterizes the interference structure inherent to ducted acoustic propagation. A similar method is also presented by which the range can be estimated to a tonal source that later transits a shallow water region that has previously been characterized by $\beta$. This paper focuses solely on tonal acoustic sources, exploiting one of the defining characteristics of cargo ship emissions. The methods presented require minimal a priori environmental knowledge and relatively few assumptions regarding the acoustic sources. $\beta$ is estimated through spectral analysis of the fading pattern of a received acoustic signal from a transiting cargo ship that broadcasts its GPS location through Automatic Identification System (AIS) data. Range is estimated using a similar method, but also requiring a rough source velocity estimate. Close agreement is seen between simulated results obtained using Kraken and experimental results using data from the Swellex ’96 experiment, in which a shallow source was used to estimate the range to a deep source.

Type

Master's thesis

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Citation

Young, Andrew (2017). Passive Ranging of Tonal Sources in Shallow Water Using the Waveguide Invariant. Master's thesis, Duke University. Retrieved from https://hdl.handle.net/10161/15234.

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