Accession Number:

AD0745302

Title:

A Digital Beamformer for Narrowband Sonar Systems.

Descriptive Note:

Technical rept.,

Corporate Author:

TEXAS UNIV AUSTIN APPLIED RESEARCH LABS

Personal Author(s):

• Pitt,S. Patrick
• Adams,W. Thomas
• Vaughan,J. Kenneth

Report Date:

1972-04-03

Pagination or Media Count:

115.0

Abstract:

Near the end of 1968, the study of geometric quantization of input data for digital replica correlation led to the concept of a digital beamformer using the same technique. Geometric AD GAD provides a wide digital dynamic range with a small number of bits. Such a beamformer was proposed, using quadrature sampling and digital phase shifting to approximate desired time delays. A computer simulation was used to determine feasibility and, as a result, a particular version applicable to narrowband systems using cylindrical arrays was implemented and tested. Results show that such a system provides a good approximation to a fully linear, phase shift beamformer. Author

Descriptors:

• *SONAR RECEIVERS
• NARROWBAND
• HYDROPHONES
• DIGITAL SYSTEMS
• PHASE SHIFT CIRCUITS
• ANALOG TO DIGITAL CONVERTERS
• COMPUTER PROGRAMS
• FEASIBILITY STUDIES

Subject Categories:

• Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE