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Effects of internal waves on low frequency, long range, acoustic propagation in the deep ocean
(Massachusetts Institute of Technology, 2007)
This thesis covers a comprehensive analysis of long-range, deep-ocean, low-frequency, sound propagation experimental results obtained from the North Pacific Ocean. The statistics of acoustic fields after propagation through ...
Laboratory evaluation of laser-induced breakdown spectroscopy (LIBS) as a new in situ chemical sensing technique for the deep ocean
(Massachusetts Institute of Technology, 2007)
Present-day expeditionary oceanography is beginning to shift from a focus on short-term ship and submersible deployments to an ocean observatory mode where long-term temporally-focused studies are feasible. As a result, a ...
A parallel hypothesis method of autonomous underwater vehicle navigation
(Massachusetts Institute of Technology, 2009)
This research presents a parallel hypothesis method for autonomous underwater vehicle navigation that enables a vehicle to expand the operating envelope of existing long baseline acoustic navigation systems by incorporating ...
Uncertainty Quantification in ocean state estimation
(Massachusetts Institute of Technology, 2013)
Quantifying uncertainty and error bounds is a key outstanding challenge in ocean state estimation and climate research. It is particularly difficult due to the large dimensionality of this nonlinear estimation problem and ...
Controller design for underwater vehicle systems with communication constraints
(Massachusetts Institute of Technology, 2015)
Real-time cooperation between autonomous vehicles can enable time-critical missions such as tracking and pursuit of a dynamic target or environmental feature, but relies on wireless communications. Underwater, communication ...
Computational imaging and automated identification for aqueous environments
(Massachusetts Institute of Technology, 2011)
Sampling the vast volumes of the ocean requires tools capable of observing from a distance while retaining detail necessary for biology and ecology, ideal for optical methods. Algorithms that work with existing SeaBED AUV ...
Three-dimensional acoustic propagation through shallow water internal, surface gravity and bottom sediment waves
(Massachusetts Institute of Technology, 2011)
This thesis describes the physics of fully three-dimensional low frequency acoustic interaction with internal waves, bottom sediment waves and surface swell waves that are often observed in shallow waters and on continental ...
Estimation and tracking of rapidly time-varying broadband acoustic communication channels
(Massachusetts Institute of Technology, 2006)
This thesis develops methods for estimating wideband shallow-water acoustic communication channels. The very shallow water wideband channel has three distinct features: large dimension caused by extensive delay spread; ...
Adaptive sampling in autonomous marine sensor networks
(Massachusetts Institute of Technology, 2006)
In this thesis, an innovative architecture for real-time adaptive and cooperative control of autonomous sensor platforms in a marine sensor network is described in the context of the autonomous oceanographic network scenario. ...
Quantifying hurricane wind speed with undersea sound
(Massachusetts Institute of Technology, 2006)
Hurricanes, powerful storms with wind speeds that can exceed 80 m/s, are one of the most destructive natural disasters known to man. While current satellite technology has made it possible to effectively detect and track ...