Fluctuations of the Acoustic Field Bragg Backscattered from Rough Surfaces.
Abstract
A rigorous theory of backscattering from slightly rough statistically nonstationary surfaces is developed. The development procedes through the application of two ensemble averages: the first to all realizations of the surface having fixed nonstationary features, and the second over all nonstationary surface characteristics. The resulting theory is applied to acoustic seafloor reverberation, where it is found that nonstationarity must be assumed to obtain agreement with observed reverberation fluctuations. The analysis is further extended to the time domain where it is demonstrated that for Bragg scatter, no reduction in the predicted fluctuations occurs for frequency diverse waveforms, thus providing a method of differentiating Bragg scatter from other nonresonant scattering processes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 30, 1996
- Accession Number
- ADA304186
Entities
People
- Suzanne T. Mcdaniel