Search
Now showing items 1-10 of 14
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 ...
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 ...
Geoacoustic inversion by mode amplitude perturbation
(Massachusetts Institute of Technology, 2007)
This thesis introduces an algorithm for inverting for the geoacoustic properties of the seafloor in shallow water. The input data required by the algorithm are estimates of the amplitudes of the normal modes excited by a ...
Application of statistical learning theory to plankton image analysis
(Massachusetts Institute of Technology, 2006)
A fundamental problem in limnology and oceanography is the inability to quickly identify and map distributions of plankton. This thesis addresses the problem by applying statistical machine learning to video images collected ...
Cooperative localization for autonomous underwater vehicles
(Massachusetts Institute of Technology, 2009)
Self-localization of an underwater vehicle is particularly challenging due to the absence of Global Positioning System (GPS) reception or features at known positions that could otherwise have been used for position ...
Stochastic mapping for chemical plume source localization with application to autonomous hydrothermal vent discovery
(Massachusetts Institute of Technology, 2006)
This thesis presents a stochastic mapping framework for autonomous robotic chemical plume source localization in environments with multiple sources. Potential applications for robotic chemical plume source localization ...