Accession Number:

ADA247751

Title:

Large Resonance Signature in Scattering from Submerged Elastic Targets in the Time and Frequency Domain

Descriptive Note:

Final rept.

Corporate Author:

NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS

Personal Author(s):

• Werby, M. F.
• Chin-Bing, S. A.

Report Date:

1991-10-01

Pagination or Media Count:

11.0

Abstract:

There are a variety of resonances that can be excited when one scatters a wave from a submerged elastic target. It is usual to detect these resonances by observing the backscattered echoes from either pulses for the time domain case or by varying frequency in small step sizes in the frequency domain case. Many such resonances produce fairly small effects that can get lost in the background in any realistic environment. On the other hand several types of resonances are quite prominent and quite possible can be observed even in a fluctuating environment. Many of these resonances have characteristic return signals and offer a tell-tale event of a particular target. We refer to such characteristic signals as resonance signature. In this study we illustrate a number of resonance signatures and describe the underlying physics or mathematics behind the event. We indicate how these signatures can be useful in target identification.

Descriptors:

• *ACOUSTIC SIGNATURES
• *ECHOES
• *ACOUSTIC SCATTERING
• TARGETS
• TIME
• HANDS
• BACKGROUND
• TIME DOMAIN
• FREQUENCY DOMAIN
• BACKSCATTERING
• ENVIRONMENTS
• FREQUENCY
• PULSES

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE