Coupled Research in Ocean Acoustics and Signal Processing for the Next Generation of Underwater Acoustic Communication Systems
Abstract
Description: Technical work this period has spanned two areas. The first of these is VHF Acoustics. During this time period, the Principle Investigator worked with Dr. Grant Deane at the Scripps Institution of Oceanography to conduct a second VHF acoustics wave tank experiment. Using experience from the first full experiment conducted in October 2015, Dr. Deane designed and fabricated a new array mounting mechanism that was able to maintain stability to on the order of millimeters in the tank with wind speeds up to 16 meters per second. The data from the experiment was all quality checked and found to be of very high quality. Quality check results are discussed more fully in the Results and Recommendations section of this report. Numerous insights were gained from the analysis and are described more fully in the Results and Recommendations section of this report. In parallel, the Principle Investigator continued to work with vendors to develop a new field deployable system for collecting VHF acoustic data in a wide range of environments. This work falls under Research Task 2 from Section 2.2 of the Technical Approach and Justification. The second area of work involved the continued development and convergence analysis of new methods of applying reduced-dimensional inference algorithms to improve the performance of or reduce the computational complexity of coherent equalizer adaptation algorithms. This is joint work with MIT/WHOI Joint Program Student, Atulya Yellepeddi and is motivated by the desire to exploit lower dimensional structures in acoustic communications data, specifically frequency domain transformations of received communications signals, to achieve the specified improvements. The work this quarter focused on the continued development and analysis of an Expectation Maximization (EM) based technique that exploits a proposed graph structure of the data to improve performance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 05, 2016
- Accession Number
- AD1013191
Entities
People
- James Preisig