Search
Now showing items 21-30 of 33
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 ...
Low frequency active sonar performance in the Arctic Beaufort Lens
(Massachusetts Institute of Technology, 2017)
A newly discovered double ducted acoustic environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower ...
Stratification on the Skagit Bay tidal flats
(Massachusetts Institute of Technology, 2012)
Estuarine density stratification may be controlled primarily by cross-shore processes (analogous to longitudinal control in narrow estuaries), or by both cross- and alongshore processes (typical of coastal plumes). Here ...
Measuring surface ocean wave height and directional spectra using an Acoustic Doppler Current Profiler from an autonomous underwater vehicle
(Massachusetts Institute of Technology, 2012)
The Acoustic Doppler Current Profiler (ADCP) is a proven technology which is capable of measuring surface wave height and directional information, however it is generally limited to rigid, bottom mounted applications which ...
MEMS IMU inertial measurement unit one-way-travel-time inertial measurement unit autonomous underwater vehicles
(Massachusetts Institute of Technology, 2017)
Recent advances in acoustic navigation methodologies are enabling the way for AUVs to extend their submerged mission time and maintain a bounded XY position error. Additionally, advances in inertial sensor technology have ...
Performance analysis for lateral-line-inspired sensor arrays
(Massachusetts Institute of Technology, 2011)
The lateral line is a critical component of the fish sensory system, found to affect numerous aspects of behavior including maneuvering in complex fluid environments, schooling, prey tracking, and environment mapping. This ...
Three-dimensional propagation and scattering around a conical seamount
(Massachusetts Institute of Technology, 2007)
In this thesis, a numerically effcient three-dimensional propagation and scattering model is developed based on the three-dimensional coupled mode theory for axisymmetric bathymetry. The three-dimensional coupled mode ...
Single Transponder Range Only Navigation Geometry (STRONG) applied to REMUS autonomous under water vehicles
(Massachusetts Institute of Technology, 2005)
A detailed study was conducted to prove the concept of an iterative approach to single transponder navigation for REMUS Autonomous Underwater Vehicles (AUVs). Although the concept of navigation with one acoustic beacon is ...
Analysis of 2-axis pencil beam sonar microbathymetric measurements of mine burial at the Martha's Vineyard Coastal Observatory
(Massachusetts Institute of Technology, 2005)
The changing state of warfare has driven the US Navy's area of operations closer to shore into littoral coastal waters. Mine Warfare has been proven as an extremely effective means of battlespace control in these waters. ...
Broadband and statistical characterization of echoes from random scatterers : application to acoustic scattering by marine organisms
(Massachusetts Institute of Technology, 2013)
The interpretation of echoes collected by active remote-sensing systems, such as sonar and radar, is often ambiguous due to the complexities in the scattering processes involving the scatterers, the environment, and the ...