Investigation of UWB Time-Domain Electromagnetic Phenomenology.
Abstract
The research investigated under this grant has focused on the basic problem of time-domain electromagnetic scattering and propagation in various physical environments. An issue of particular importance has been dispersion, and how it is manifested in the time domain, Particular dispersive environments that have been investigated are periodic and quasi-periodic propagation and scattering, short-pulse propagation in lossy, dispersive soils. With regard to this latter topic, a significant problem of interest involved short-pulse electromagnetic scattering from buried targets, with a focus on buried mines. The research on short-pulse wave phenomenology has motivated a new research thrust, in which the underlying phenomenology is exploited in the development of what has been termed "wave-oriented" signal processing. Particular signal processing algorithms that have been investigated including the Gabor transform, the wavelet transform, and windowed superresolution processing. In this context, we have also performed sophisticated Cramer-Rao bound studies to assess the ultimate accuracy of such algorithms when the data is containunated with additive noise. Finally, the phenomenology is being exploited in the development of new wave-based time-frequency algorithms, in particular the wave-based methods of matched pursuits. This algorithm is very useful for the denoising of scattering data and is not being placed in the context of a decision-theoretic paradigm.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 08, 1996
- Accession Number
- ADA332353
Entities
People
- Lawrence Carin
Organizations
- Duke University