Accession Number:

ADA010229

Title:

The Use of Computer-Generated Pictures to Extract Information from Underwater Acoustic Transfer Function Data.

Descriptive Note:

Technical rept.,

Corporate Author:

MICHIGAN UNIV ANN ARBOR COOLEY ELECTRONICS LAB

Personal Author(s):

• Cederquist,Gerald N.

Report Date:

1975-04-01

Pagination or Media Count:

205.0

Abstract:

A fundamental block to the experimental measurement of the time-varying transfer function of an underwater acoustic channel has been the inability of the scientist to cope with the necessarily detailed and hence large amount of data involved. This research shows that computer-generated pictures are one key to solving this data deluge problem. Data display techniques are developed to scan large amounts of multifrequency, bandpass, underwater acoustic transfer function data in the form of computer generated pcitures. Transformations are defined to reveal regions of interest as peaks and edges in the pictures. Thus an observer can follow these regions both in frequency and in time, gaining insights into propagation which are impossible to glean from single-frequency data. In addition, the techniques permit easy separation of propagation variations due to low signal-to-noise ratio from variation due to oceanographic effects. These display techniques, applied to transfer function data collected in the Straits of Florida, reveal new insights into underwater acoustic propagation in this locale.

Descriptors:

• *ACOUSTIC VELOCITY
• *UNDERWATER SOUND
• MATHEMATICAL MODELS
• FOURIER TRANSFORMATION
• STOCHASTIC PROCESSES
• TRANSFER FUNCTIONS
• SIGNAL TO NOISE RATIO
• INTERACTIVE GRAPHICS
• ACOUSTIC ATTENUATION
• SALINITY
• THERMOCLINES
• FLORIDA STRAIT

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE