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Detection, classification and localization of seabed objects with a virtual time reversal mirror
(Massachusetts Institute of Technology, 2009)
The work presented in this thesis addresses the problem of the detection, classification and localization of seabed objects in shallow water environments using a time reversal approach in a bistatic configuration. The ...
Sparse Bayesian information filters for localization and mapping
(Massachusetts Institute of Technology, 2008)
This thesis formulates an estimation framework for Simultaneous Localization and Mapping (SLAM) that addresses the problem of scalability in large environments. We describe an estimation-theoretic algorithm that achieves ...
Acoustic scattering from sand dollars (Dendraster Excentricus) : modeling as high aspect ratio oblate objects and comparison to experiment
(Massachusetts Institute of Technology, 2008)
Benthic shells can contribute greatly to the scattering variability of the ocean bottom, particularly at low grazing angles. Among the effects of shell aggregates are increased scattering strength and potential subcritical ...
Acoustic scattering of broadband echolocation signals from prey of Blainville's beaked whales : modeling and analysis
(Massachusetts Institute of Technology, 2006)
Blainville's beaked whales (Mesoplodon densirostris) use broadband, ultrasonic echolocation signals (27 to 57 kHz) to search for, localize, and approach prey that generally consist of mid-water and deep-water fishes and ...
Landmine detection with a standoff acoustic/laser technique
(Massachusetts Institute of Technology, 2008)
Landmines and mine-like traps are effective weapons that are difficult to detect and discriminate from a safe distance. The ability to detect landmines in their host environment at a distance and to discriminate them from ...
Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
(Massachusetts Institute of Technology, 2009)
A confluence of several coastal oceanographic features creates an acoustically interesting region with high variability along the New England Shelfbreak. Determining the effect of the variability on acoustic propagation ...
A computational tool for the rapid design and prototyping of propellers for underwater vehicles
(Massachusetts Institute of Technology, 2007)
An open source, MATLABTM-based propeller design code MPVL was improved to include rapid prototyping capabilities as well as other upgrades as part of this effort. The resulting code, OpenPVL is described in this thesis. ...
The feasibility of sodar wind profile measurements from an oceanographic buoy
(Massachusetts Institute of Technology, 2006)
This thesis explores the feasibility of making wind speed profile measurements from an oceanographic buoy using a Doppler sodar. In the fall of 2005, we deployed a Scintec SFAS sodar on an ASIS buoy. Roughly one week of ...
Target tracking onboard an autonomous underwater vehicle : determining optimal towed array heading in an anisotropic noise field
(Massachusetts Institute of Technology, 2007)
In order to overcome the challenges that an anisotropic noise field poses for underwater target tracking, we conduct an onboard estimation of the horizontal noise directionality in the real-time processing suite of an ...