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
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Outline Introduction Experiment description Environment of ocean Matched field processing Sound propagation model MFP source localization results Conclusion 1/22/4 2
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
Experiment description Shiyan3 Shiyan2 32-elements VLA 38g WBS (5m) 1/22/4 4
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
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
SVP of sea water used in MFP source localization 2 Depth (m) 4 6 8 1 1518 152 1522 1524 1526 1528 153 Sound speed (m/s) From 21/6/3/2:5 to 21/6/3/23:5 1/22/4 7
Sea-water depth from center(o) to southwest (E) 95 Sea depth of direction O-E 1 O(29D4'N, 126D49'E) Depth(m) 15 11 E(29D26'N, 126D41'E) 115 5 1 15 2 25 3 Range(km) 1/22/4 8
Sea-water depth from northwest (Site F) to southeast (Site J) 8 9 1 Sea depth of direction F-O-G-J F(29D48'N, 126D33'E) O(29D4'N, 126D49'E) Depth(m) 11 12 13 14 J(29D29'N, 127D17'E) 15-3 -2-1 1 2 3 4 5 Range(km) 1/22/4 9
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 1 2 1 2 1 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
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
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
The range-depth ambiguous function of a WBS at range 7.km 1/22/4 13
The range-depth ambiguous function of a WBS at range 18.9 km MFP range 18.5km and depth 46m 1/22/4 14
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 2 15 1 5 MFP Depth / km 4 6 8 5 1 15 2 25 3 GPS Range/km MFP range results 1 5 1 15 2 25 3 GPS Range / km MFP depth results 1/22/4 15
MFP range results from northwest(f) to southeast(j) 5 4 3 Direction F-O-G-J Site J 5 4 3 Direction F-O-G-J Flat bottom MFP Range / km 2 1-1 Shiyan3 Site G MFP Range/km 2 1-1 Shiyan3-2 Site F -3-3 -2-1 1 2 3 4 5 GPS Range / km Slope bottom model -3-3 -2-1 1 2 3 4 5 GPS Range/km 1/22/4 16-2 Flat bottom model
MFP depth results from northwest (Site F) to southeast(site J) MFP Depth / m 1 Direction F-O-G-J 2 Slope bottom 3 4 5 6 7 8 9 1-3 -2-1 1 2 3 4 5 GPS Range / km Slope bottom model MFP Depth / m 1 2 3 4 5 6 7 8 Direction F-O-G-J Flat bottom Shiyan3 9 1-3 -2-1 1 2 3 4 5 GPS Range / km Flat bottom model 1/22/4 17
Simplification of the mean sound speed profile 2 Depth (m) 4 6 1 4 2 3 8 1 12 1518 152 1522 1524 1526 1528 153 Speed (m/s) 1/22/4 18
MFP range results from Site O to Site J with the simplified profiles 5 5 4 4 MFP Range (km) 3 2 SVP1 MFP Range (km) 3 2 SVP2 1 1 1 2 3 4 5 GPS Range (km) 1 2 3 4 5 GPS Range (km) 5 5 4 4 MFP Range (km) 3 2 SVP3 MFP Range (km) 3 2 SVP4 1 1 1 2 3 4 5 GPS Range (km) 1 2 3 4 5 GPS Range (km) 1/22/4 19
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
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
Thanks! 1/22/4 22