A Digital Beamformer for Narrowband Sonar Systems.

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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

Author(s):
Pitt, S. Patrick ; Adams, W. Thomas ; Vaughan, J. Kenneth
Author Organization(s):
TEXAS UNIV AUSTIN APPLIED RESEARCH LABS
Descriptive Note:
Technical rept.,
Pagination:
0115

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARL-TR-72-3
Contract/Grant Number(s):
N00024-72-C-1008
Task Number(s):
8103
Project Number(s):
SF-11-121-106, SF11-121-104
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*SONAR RECEIVERS, NARROWBAND, HYDROPHONES, DIGITAL SYSTEMS, PHASE SHIFT CIRCUITS, ANALOG TO DIGITAL CONVERTERS, COMPUTER PROGRAMS, FEASIBILITY STUDIES
Field(s)/Group(s):
Acoustic Detection and Detectors
Keyword(s):
AN SQS 23, BEAM FORMING, SIGNAL PROCESSING, COMPUTERIZED SIMULATION
Report Date:
1972 Apr 03