(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-09)
Miller, Thomas E.
Due to the costs involved and time required to perform experiments at sea, it is important
to provide accurate simulations of the ocean environment. Using the ray tracing code,
BELLHOP, the Mission Oriented Operating Suite (MOOS), methods outlined by the Naval
Research Laboratory (NRL) for bottom reverberation, and MATLAB, a model will be developed
to incorporate the effects of bottom reverberation into the BELLHOP suite of code.
This will be accomplished by using BELLHOP to generate a ray trace and eigen ray file.
Then a MATLAB script will take the BELLHOP information and calculate the reverberation
level using the NRL model by measuring the amplitude and reverberation at a receiver
array simulated on the ocean floor. These reverberation values will then be used to determine
the reverberation level at the source due to these bottom interactions. Testing of the
simulation will include deep and shallow ocean profiles and multiple sound speed profiles
(SSP). Following this testing, the goal is to implement the model in existing C++ code used
for the testing of AUV systems. The ability to accurately model the ocean will not only
allow for testing of autonomy code in the laboratory, but also make it possible to refine and
calibrate code making ship time more efficient.
