Horizontal Directionality of Ambient Noise During the CHURCH OPAL Exercise

reportActive / Technical Report | Accession Number: ADC017835 | Open PDF

Abstract:

Ambient noise horizontal directionality was measured in the Northeast Pacific Ocean during the CHURCH OPAL exercise of September 1975. Results obtained from the analysis of data acquired by a towed line-array are reported. The results for frequencies dominated by shipping below 200 Hz indicate a definite north-south bias in excess of 15 dB at some frequencies. The results are similar to the CHURCH ANCHOR results obtained at the same location 2 years previously, supporting the idea that the pseudo-stationary background noise is repeatable and hence, predictable.

Author(s):
Wagstaff, R. A.
Author Organization(s):
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
Descriptive Note:
Research rept. Oct 1975-Oct 1978
Supplementary Note:
DOI: 10.21236/ADC017835
Pagination:
0088

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NOSC-TR-394
Monitor Series:
NOSC
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.2_Exercising; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_4_Logistics; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support; JCA_1.2.5_Lessons Learned
Modernization Areas:
Microelectronics
Communities of Interest:
Sensors
Descriptor(s):
*TOWED ARRAYS, *UNDERWATER SOUND SIGNALS, WAVE PROPAGATION, HORIZONTAL ORIENTATION, AMBIENT NOISE, SHIPPING, NORTH PACIFIC OCEAN, DIRECTIONAL
Field(s)/Group(s):
Acoustic Detection and Detectors, Acoustics
Keyword(s):
*CHURCH OPAL EXERCISE, CHURCH ANCHOR EXERCISE, LAMBDA(LARGE APERTURE MARINE BASIC DATA ARRAY), MARINE BIOLOGICAL NOISE, SUPERLOW FREQUENCY, EXTREMELY LOW FREQUENCY, PE63795N
Report Date:
1978 Oct 01