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Thrust Category: Long-Range Propagation LONG-TERM GOALS
BibTeX
@MISC{Spindel_thrustcategory:,
author = {Robert C. Spindel and Peter F. Worcester},
title = {Thrust Category: Long-Range Propagation LONG-TERM GOALS},
year = {}
}
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Abstract
The ultimate limits of long-range sonar are imposed by ocean variability and the ambient sound field. Scattering from internal waves limits the temporal and spatial coherence of the received signal. Low frequency noise is dominated by shipping and ultimately, by wave-breaking processes. The resulting “granularity ” of the noise field can be exploited for detection and localization purposes. Our ultimate objective is to understand the fundamental limits to signal processing imposed by these ocean processes, to enable advanced signal processing techniques, including matched field processing and other adaptive array processing methods, to capitalize on the three-dimensional character of the sound and noise fields. OBJECTIVES The objective of this research is to understand the basic physics of low-frequency, broadband propagation and the effects of environmental variability on signal stability and coherence. In particular, it focuses on 3-D wave front coherence (horizontal, vertical, and temporal), on the details of signal energy redistribution through mode scattering, on signal and noise variability on ocean-basin scales, and on environmental processes such as internal waves that most affect long-range coherence. APPROACH
Keyphrases
thrust category long-range propagation long-term goal internal wave noise field basic physic long-range sonar wave-breaking process noise variability environmental variability signal energy redistribution received signal broadband propagation affect long-range coherence environmental process ocean variability mode scattering ultimate objective matched field processing fundamental limit ultimate limit signal stability localization purpose three-dimensional character spatial coherence low frequency noise ocean process adaptive array processing method ocean-basin scale ambient sound field 3-d wave advanced signal processing technique
