Extensions to Lisa Zurk’s depth-based signal separation method

Abstract

Lisa Zurk and her colleagues introduced a depth-based signal separation method that uses interference between the direct and surface-reflected CW signals which are received on a bottom-moored vertical line array in deep water [Asilomar Conference on Signals, Systems and Computers, IEEE, 2130–2312, 2013, J. Acoust. Soc. Am. 133(4), EL320-EL325, 2013]. In this work, her method was extended to broadband signals for instantaneous depth-based signal separation and range estimation. The broadband method was successfully tested by using a single phone or a pair of phones, deployed in the Northern Gulf of Mexico. A broadband (250–800 Hz) source was towed at 20 m, 50 m, and 100 m depths and received at four bottom-moored Environmental Acoustic Recording Systems (EARS). Source depth estimation and localization by trilateration was successfully demonstrated. Realizing the lack of comprehensive CW and broadband data sets, two experiments were planned for late 2022 and mid 2023 in collaboration with Lisa Zurk. These experiments will still be conducted to demonstrate her depth-based signal separation method experimentally. [Work supported by the ONR.]