Accession Number:

AD0648010

Title:

CROSS-CORRELATION LOSS CAUSED BY BOTTOM REFLECTION,

Descriptive Note:

Corporate Author:

NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s):

• Cron,Benjamin J.
• Shaffer,Robert L.

Report Date:

1966-12-27

Pagination or Media Count:

24.0

Abstract:

The cross-correlation between an incident direct and a bottom-reflected pulse is analyzed, and the physical models of the reflection process are briefly reviewed. A three-layer model is assumed for the analysis performed in this report. The bottom is considered to act as a linear filter, and the transfer function, which includes the general case of attenuation and phase shift, is given for the filter. A random function with a flat spectrum and finite bandwidth is transmitted, and the cross-correlation between the direct and the bottom-reflected versions of this random function is obtained. For the special case of no attenuation, there is negligible change in the correlation peak when Q or 1.5, where Q is the center frequency divided by the bandwidth. The cross-correlation peak is evaluated as a function of the bandwidth in Hz and the attenuation in nepersHz. Author

Descriptors:

• (*UNDERWATER SOUND SIGNALS
• DISTORTION)
• (*SONAR PULSES
• REFLECTION)
• OCEAN BOTTOM
• MATHEMATICAL MODELS
• STATISTICAL FUNCTIONS
• TRANSFER FUNCTIONS

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE