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D~f-A193 229 VERTICAL DIRECTIONALITY OF AMBIENT NOISE AT 32 DEG N AS I/FUNCTION OF LON (U) SCRIPPS INSTITUTION OF
OCEANOGRAPHY LA JOLLA CA MARINE PHYSICUNCLASSIFIED W S HODGKISS ET AL JAN 88 MPL-TM-287-D F/G 28/1EEIIEIIIIIIII~lElllEEllll.EElllllllElllIEIIIEEEEEIIIIEIIIIIIEEEEEIIEEEEllllEEEEEEIEIIIIIIIIIIIIl
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0 --MARINE P~HYSICAL
LABORATORY
SCRIPPS I.NSTITUTION OF OCEANOGRAPHY
San Diego. California 92152
a)
V ERTICAL DIRECTIONALITY OF AMBIENT NOISEAT 32 *N AS A FUNCTION OF LONGITUDE:Tape #186247
I W. S. Hodgkiss and F. H. Fisher
00
V MPL TECHNICAL MEMORANDUM 387-D
6.~NMPL-U-32/86
Approved for public release, distribution unlimited.
N
January 1988
%~ %
R7 C S S .- S C.
REPORT DOCUMENTATION PAGE
a -3E:OR7SCRT CASS.CA7 ON lo RESTRICTIVE MARKINGSUN~SIF=~
,a -. ,RITY CASSF CATON, A,,Tm-OR,7Y 3 DISTRIBU3LTION /AVAiLABILITY OF RIEPORi
~ ECSSF.ATONDONCRANGSC"EDULE Approved for public release; distributionunlimnited.
4 PERFORMiNG CRGAN4ZAT,:ON REPORT NUMBER(S) 5. MONITORING ORGANIZATION REPORT NUMBER(S)
1TL Technical Menrrandumn 387-D [NPiL-U-32/86]
6a NAME OF PERF:ORMING ORGANIZATION 6o OFFICE SYMBOL 7a NAME OF MONITORING ORGANIZATION
MarnePhyicl aboatry (If aoplicable) Office of Naval Research
Department of the Navy6c. ADDRESS \C~ty, stare, and ZIP Cocle) 7b. ADDRESS (City/, State, and ZIP Code)
University of California, San Diego 800 North Quincy StreetScrinps Institution of Oceanography Arlington, VA 22217-5000San Diego, CA 92152______________ _________
3a. NAME OF ;*NDING, SPONSORING 8b OFFICE SYMBOL 9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER
Office of Naval Research ONR N00014-84-K-0097 and N00014-87-C-0127
3c. ADDRESS (City, State. and ZIP Code) 10 SOURCE OF FUNDING NUMBERS
Deparmnt of the Navy PROGRAM IPROJECT ITASK WORK UNIT
800 North Quincy Street ELEMENT NO. NO. NOACESON.Arlingjton, VA 22217-5000
11 iTLE (include Security Classification)
Vertical Directionality of Ambient Noise at 321N as a Function of Longitude: Tape #86247
*~ ~ W . PES dgT Rss ad F. H. Fisher
i3a. TYPE OF REPORT 13b, TIME COVERED 114- DATE OF REPORT (Year, Month, Day) 115 PAGE COUNT
*tech rxio FROM TO January 1988 I 12316. SUPPLEMENTARY NOTATION
!7COSATI CODES 18. SUBJECT TERMS (Continue on reverse if necessary and identify by block number)
FELD ROUP SUB-ROUP ambient noise, PL 27-elertent vertical array, vertical
directionality, 9 ABSTRACT (Continue on reverse if necessary and identify by block number)
0 Measurements have been made of the ambient noise field between 25 and 300 Hz -with vertical
arrays at 32 'N (1241 * %, 136 'W, and 150 W). This technical report contains the complete analysis
results for the MPL 27-element vertical array Tape 06247. The tape was recorded at 32 N, 136 WV
(approximately 1000 nmi due west of San Diego) on 9 'May 1986 beginning at 13:38 PDT. At that time,the wind speed was 17 kts.
N
0D67RBUT ON' AVAILABILITY OF ABSTRACT 21 ABSTRACT SECuRiTY CLASSIFICATION
~jCL5I~D'JL'IED~ SAMEc AS RPT :)DTIC IJSERS UNCASFIED22a NAME ~ E3PO~SB~S ND'JDUAL 22bTELEPHONE (include Area Code) cOFIESBL
W. S. Hcxgkiss 5. 619-534-1798 T
DD FORM 1473, 3e %.AR 83 APR edt on mnay oe used urtil exnausted SECURITY CLASSIFICATION OF THIS PAGEAll1 other Pdinans are oosoiete eus ~r ~.i667O
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Vertical Directionality of Ambient Noise
at 32 * N as a Function of Longitude:
Tape #86247
W.S. Hodgkiss and F.H. Fisher
Marine Physical LaboratoryScripps Institution of Oceanography
San Diego, CA 92152
Abstract
Measurements have been made of the ambient noise field between 25 and 300 Hz with vertical
arrays at 32 N (121- W, 136 °W, and 150 °W). This technical report contains the complete analysisresults for the MIPL 27-ulement vertical array Tape *86247. The tape was recorded at 32 o N, 136 °W
(approximately 1000 nmi due west of San Diego) on 9 May 1986 beginning at 13:38 PDT. At that time,the wind speed was 17 kts.
*';0
'a.
% %
1. Introduction
This technical report contains the complete analysis results for the NIPL 27-element vertical array
Tape #86247. The tape was recorded at 32 * N, 136 ' V (approximately 1000 nmi due west of San Diego)
on 9 May 1986 beginning at 13:38 PDT. At that time, the wind speed was 17 kts.
A complete description of the experiment and data analysis procedure is given in the summary
technical report (TNI-387-A). Here, a brief guide will be provided to the results documented in the the
various sections.
Section 11 (Preliminary Analysis) provides a preliminary look at the data quality from 4
'.
hydrophones spaced approximately equally across the array for the first data segment (65536 points).
The results are ordered as follows:
(1) 9 haniel means (A D counts).
(2) Time series (A/D counts) for the first 1024 points of the first segment.
(3) Time-varying m eran (AbD counts, 64-point averagesd
(4) Time-varying power (AD counts squared, 64-point averages) (channel means have been
removedc).
(5) Power spectra (dB//pPa/Vllz) (channel means have been removed).
Section III (Power Spectra) provides an extended preliminary look at the power spectra from all
hydrophones in the array for the first data segment (65536 points). The results are ordered as follows:
(1) Channel means (A/D counts).
(2) Power spectra (dB//pPa/V/Iz) (channel means have been removed).4
Section (Array R csponse: Waterfall, 1KB Window) provides waterfall plots of the time-evolving For
vertical directionality of ambient noise for successive segments (65536 points) across the entire data
tape (dB//pPa/ r A Kaiser-Bessel window (a = 1.5) was used to amplitude shade the array
elemnents.
rl/
Section V (Pwray I -ponsc Waterfall Rect WindoSpcr) provides waterfall plots of the ti rme-evlving
;ltst Spec la4
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vertical directionality of ambient noise for successive segments (65536 points) across the entire data
tape (dB//pPa//HzDeg). A rectangular window was used to amplitude shade the array elements.
Section VI (Array Response: Panels, KB Window) provides multi-panel plots of the time-evolving
vertical directionality of ambient noise for successive segments (65536 points) across the entire data
tape (dB//pPa/V/lzDeg). A Kaiser-Bessel window (a = 1.5) was used to amplitude shade t'he array
elements.
Section VII (Array Response: Panels, Rect Window) provides multi-panel plots of the time-evolving
vertical directionality of ambient noise for successive segments (65536 points) across the entire data
, tape (dB//pPa//HzDeg). A rectangular window was used to amplitude shade the array elements.
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