Accession Number:

AD0831579

Title:

PROCESSING OF DATA FROM SONAR SYSTEMS, VOLUME 4, SUPPLEMENT 1

Descriptive Note:

Annual rept. 1 Jul 1965-1 Jul 1966

Corporate Author:

GENERAL DYNAMICS GROTON CT ELECTRIC BOAT DIV

Personal Author(s):

• Kanefsky, Morton
• Hill, Jr., F. S.
• Schultheiss, Peter M.

Report Date:

1967-12-27

Pagination or Media Count:

136.0

Abstract:

This Supplement and Volume IV examine performance of digital optimal and suboptimal detectors in an interference-dominated environment. Costs of clipping and sampling and the problem of recovering clipping losses are evaluated. Detection threshold variations dependent on measured noise parameters are also studied. Using noise power as a parameter shows non-parametric properties asymptotically independent of the noise amplitude distribution. Reduced dependency on noise properties can also be achieved by a zero count at each hydrophone. An active receiver using widely separated receivers for reverberation and noise-dominated conditions, and the effect of linear frequency modulation on the transmitted signal, are examined. Computation of ambient noise directivity is reported for shallow depths.

Descriptors:

• *DATA PROCESSING
• *SONAR RECEIVERS
• *SONAR SIGNALS
• *UNDERWATER OBJECTS
• ANTISUBMARINE WARFARE
• FREQUENCY MODULATION
• HYDROPHONES
• MATHEMATICAL ANALYSIS
• MATHEMATICAL MODELS
• NOISE
• REPORTS
• REVERBERATION
• SAMPLING
• SCATTERING
• SIGNAL TO NOISE RATIO
• SONAR EQUIPMENT
• SONAR TARGETS
• SOUND TRANSMISSION
• TELEVISION DISPLAY SYSTEMS
• THRESHOLDS(PHYSIOLOGY)
• UNDERWATER SOUND

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE