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

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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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