Title

Localization of a geophone array in the new england mud patch

Document Type

Conference Proceeding

Date of Original Version

6-1-2019

Abstract

The "New England Mud Patch"is a 13,000 square kilometer area covered by a layer of fine-grained sediments. A large ocean acoustics experiment was held in the region in 2016 and 2017 involving a number of institutions and three research vessels. One of the receiver systems deployed during the 2017 experiment was a four-element line array of vertically gimbaled geophones. The water depth at the receiver location was 70 m and mud layer thickness was approximately 6 to 8 m. The nominal spacing of geophones in the array was 5 m. Based on the soft nature of the surficial sediments we hypothesized that the sled which housed the data acquisition packages and the geophone array elements sunk into the mud layer. The three-dimensional characterization of the array elements, specifying the shape of the array, actual spacing and depth of penetration in the mud layer, was carried out. Signals from four SUS charges were used to localize the geophones in range. In addition, noise from the R/V Hugh Sharp was used to estimate the geophone position in depth. The localization algorithm using constrained optimization based on time difference of arrivals will be discussed and performance assessed.

Publication Title

OCEANS 2019 - Marseille, OCEANS Marseille 2019

Volume

2019-June

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