Frequency-Difference Matched Field Processing in the Ocean
Abstract
The PI s effort will focuses on discovering: (a) the science and mathematics that allows use of a recorded signal s in-band frequency information to provide information at out-of-band frequencies, and (b) the practical limitations that govern the production and exploitation of such information. The proposed study~s technical approaches include (i) mathematical analysis and simulations of propagating waves in environments of interest, and (ii) investigations using existing experimental recordings to determine the extent to which unexpected results occur in specific real circumstances for variable signal-to-noise ratio, signal characteristics, recording array size, sound channel type, etc. The PI will provide quantitative specifications of the performance of the frequency-difference approach applied to both conventional (Bartlett) and adaptive MFP routines when tested with simulated and measured ocean propagation data as a function of SNR, signal characteristics, ocean waveguide characteristics, and receiving array characteristics."Accurate acoustic remote sensing is essential for Naval undersea surveillance, reconnaissance, andenvironmental sensing. Typically, information is collected from transducer recordings of propagating acoustic waves that carry information about objects or regions of interest, and the undersea environment through which they have passed. Recent ocean acoustics research has shown that a quadratic nonlinearity introduced into otherwise standard signal processing schemes can be used to deduce useful information at frequencies well below the signal s frequency band. The proposed study focuses on discovering: (a) the science and mathematics that allows use of a recorded signal s in-band frequency information to provide information at out-of-band frequencies, and (b) the practical limitations that govern the production and exploitation of such information. The proposed study~s technical approaches include (i) mathematical analysis and simulations of propagating waves in environments of interest, and (ii) investigations using existing experimental recordings to determine the extent to which unexpected results occur in specific real circumstances for variable signal-to-noise ratio, signal characteristics, recording array size, sound channel type, etc. The anticipated outcomes and impact of this research are a new and enhanced understanding of acoustic wave propagation, and performance results for novel nonlinear array signal processing schemes that may lead to disruptive new capabilities for Naval remote sensing systems.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 30, 2016
- Source ID
- N000141612975
Entities
People
- David J. Dowling
Organizations
- Board of Regents of the University of Michigan
- Office of Naval Research
- United States Navy