Broadband matched-field source localization in the East China Sea*
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1 Broadband matched-field source localization in the East China Sea* Renhe Zhang Zhenglin Li Jin Yan Zhaohui Peng Fenghua Li National Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, China * The work was supported by the National Natural Science Foundation of China and ONR 1/22/4 1
2 Report Documentation Page Form Approved OMB No Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 124, Arlington VA Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. 1. REPORT DATE 1 DEC REPORT TYPE N/A 3. DATES COVERED - 4. TITLE AND SUBTITLE Broadband Matched-field Source Localization in the East China Sea 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) National Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, China 8. PERFORMING ORGANIZATION REPORT NUMBER 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 1. SPONSOR/MONITOR S ACRONYM(S) 12. DISTRIBUTION/AVAILABILITY STATEMENT Approved for public release, distribution unlimited 13. SUPPLEMENTARY NOTES Also See: M1452, The original document contains color images. 14. ABSTRACT 15. SUBJECT TERMS 11. SPONSOR/MONITOR S REPORT NUMBER(S) 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT UU a. REPORT unclassified b. ABSTRACT unclassified c. THIS PAGE unclassified 18. NUMBER OF PAGES 22 19a. NAME OF RESPONSIBLE PERSON Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std Z39-18
3 Outline Introduction Experiment description Environment of ocean Matched field processing Sound propagation model MFP source localization results Conclusion 1/22/4 2
4 Introduction ASIAEx21was performed in the East China Sea. The environment is some complicated The effects of water depth mismatch on MFP source localization are investigated experimentally. The effects of simplified SVPs on MFP source localization are investigated also. 1/22/4 3
5 Experiment description Shiyan3 Shiyan2 32-elements VLA 38g WBS (5m) 1/22/4 4
6 The actual WBS drop locations O: the site of Shiyan3 Direction O-E: From center(o) to Southwest (E) Direction F-O-G-J : From Northwest to Southeast Given by Jim Miller 1/22/4 5
7 The Ocean Environment Experiment site is a continental slope environment. the sea depth vary from 96m to 15m in 8km range. The temperature of sea water has some fluctuation from sea surface to 7m depth. 1/22/4 6
8 SVP of sea water used in MFP source localization 2 Depth (m) Sound speed (m/s) From 21/6/3/2:5 to 21/6/3/23:5 1/22/4 7
9 Sea-water depth from center(o) to southwest (E) 95 Sea depth of direction O-E 1 O(29D4'N, 126D49'E) Depth(m) E(29D26'N, 126D41'E) Range(km) 1/22/4 8
10 Sea-water depth from northwest (Site F) to southeast (Site J) Sea depth of direction F-O-G-J F(29D48'N, 126D33'E) O(29D4'N, 126D49'E) Depth(m) J(29D29'N, 127D17'E) Range(km) 1/22/4 9
11 1/22/4 1/22/4 1 1 Matched field processor Matched field processor = = = = N i j c i N i j e i N i j i j e i j MF f p f p f p f p f z r B c * ) ( ) ( ) ( ) ( ),, ( = = M f j j MF f MF f z r B M z r B 1 ),, ( 1 ), ( 2 Broadband MFP 1 Single frequency linear Bartlett MFP
12 Sound propagation model The coupling normal mode-parabolic equation theory based on the WKBZ approximation k n φ n p c ( r, z, f ) = r 1 2 n= 1 [ k ( r, f )] is the eigenvalue at local range r ( z, r, f ) is the eigenfunction n 1 2 u n ( r, f ) φ n ( z; r, f ) Solved by WKBZ u is the normal mode coefficient, and satisfies n r u r v = A u r r + iku solved by split step PE method 1/22/4 11
13 The geo-acoustic parameters of sea bottom Sound speed 161.8m/s Density 1.86g/cm 3 Attenuation.1dB/wavelength Replica fields calculation parameters Range step: 1m Depth step: 2m Frequency band : 1Hz - 2Hz. 1/22/4 12
14 The range-depth ambiguous function of a WBS at range 7.km 1/22/4 13
15 The range-depth ambiguous function of a WBS at range 18.9 km MFP range 18.5km and depth 46m 1/22/4 14
16 MFP results from center(site O) to southwest(site E) with a flat bottom 3 25 Direction O-E 2 Direction O-E MFP Range/km MFP Depth / km GPS Range/km MFP range results GPS Range / km MFP depth results 1/22/4 15
17 MFP range results from northwest(f) to southeast(j) Direction F-O-G-J Site J Direction F-O-G-J Flat bottom MFP Range / km Shiyan3 Site G MFP Range/km Shiyan3-2 Site F GPS Range / km Slope bottom model GPS Range/km 1/22/ Flat bottom model
18 MFP depth results from northwest (Site F) to southeast(site J) MFP Depth / m 1 Direction F-O-G-J 2 Slope bottom GPS Range / km Slope bottom model MFP Depth / m Direction F-O-G-J Flat bottom Shiyan GPS Range / km Flat bottom model 1/22/4 17
19 Simplification of the mean sound speed profile 2 Depth (m) Speed (m/s) 1/22/4 18
20 MFP range results from Site O to Site J with the simplified profiles MFP Range (km) 3 2 SVP1 MFP Range (km) 3 2 SVP GPS Range (km) GPS Range (km) MFP Range (km) 3 2 SVP3 MFP Range (km) 3 2 SVP GPS Range (km) GPS Range (km) 1/22/4 19
21 Summaries Broadband matched-field source localization is applied to the VLA signals received in the jointed ASIAEX 21 For the slope bottom ocean environment, if we calculate the replica fields using the flat bottom model, significant errors can be introduced into the range and depth localization predictions. If the depth mismatch is too large, it can not localize the source properly. 1/22/4 2
22 Summaries The accuracy of the source localization is largely improved with the consideration of the slope of the bottom. The range estimates of the most signals by MFP in the range from -3.km to 5.km are consistent with the GPS measured ones well. The effects of water sound speed profile on the matched field source localization are also studied in the paper. For the four types of simplifications, MFP processor could still give stable and reliable estimation of source location. 1/22/4 21
23 Thanks! 1/22/4 22
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