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Volume 30 Issue 12
Jan.  2011
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An Liang, Wang Zhi-Qiang, Lu Ji-Ren. Calculating the Waveguide Invariant by the 2-D Fourier Transform Ridges of Lofargram Image[J]. Journal of Electronics & Information Technology, 2008, 30(12): 2930-2933. doi: 10.3724/SP.J.1146.2007.00800
Citation: An Liang, Wang Zhi-Qiang, Lu Ji-Ren. Calculating the Waveguide Invariant by the 2-D Fourier Transform Ridges of Lofargram Image[J]. Journal of Electronics & Information Technology, 2008, 30(12): 2930-2933. doi: 10.3724/SP.J.1146.2007.00800

Calculating the Waveguide Invariant by the 2-D Fourier Transform Ridges of Lofargram Image

doi: 10.3724/SP.J.1146.2007.00800
  • Received Date: 2007-05-28
  • Rev Recd Date: 2007-10-08
  • Publish Date: 2008-12-19
  • A new method is presented in this paper for the calculation of waveguide invariant () with passive sonar lofargram image. The distributions of in two waveguides are studied with normal mode model. Concise formula for calculating is then derived by finding the 2-D Fourier transforms ridges of the lofargrams. The algorithm is exercised for a Pekeris waveguide and a simulated shallow water waveguide containing thermoclines with source depth varying from 10m to 90m. It then is applied to a lofargram collected during an experiment at the South China Sea. The result of experimental data is well matched to the simulations. The approach differs from normal mode algorithm by virtue of its avoidance of potentially prohibitive computation and accurate estimation of environmental parameters and is more suitable for real-time signal processing.
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  • [1] 李启虎. 数字式声纳设计原理[M]. 合肥:安徽教育出版社,2002: 250-259.Li Qi-hu. Designing Principles of Digital Sonar[M]. Hefei:Anhui Education Press, 2002: 250-259. [2] Unrick R J. Principles of Underwater Sound 3rd ed [M]. NewYork : McGraw-Hill, 1983: 131-133. [3] Brekhovskikh L M and Lysanov Y P. Fundamentals of OceanAcoustics, 3rd ed [M]. New York: Springer-Verlag, 1991:128-129, 143-148. [4] Rouseff D and Spindel R C. Modeling the waveguideinvariant as a distribution[J].AIP Conference Proceedings.2002, 621(1):137-150 [5] Baggeroer A B. Estimation of the distribution of theinterference invariant with seismic streamers [J].AIPConference Proceedings.2002, 621(1):151-167 [6] Thode A M, Kuperman W A, and DSpain G L, et al..Localization using Bartlett matched-field processorsidelobes[J].J. Acoust. Soc. Am.1999, 107(1):278-286 [7] Lourens J G. Passive sonar detection of ships withspectrograms [J]. IEEE 1990 South African Symposium onCommunications and Signal Processing, Johannesburg, 1990:147-151. [8] D'Spain G L and Kuperman W A. Application of waveguideinvariants to analysis of spectrograms from shallow waterenvironments that vary in range and azimuth[J].J. Acoust.Soc. Am.1999, 106(5):2454-2468 [9] 王东晓, 杜岩, 施平. 南海上层物理海洋学气候图集[M]. 北京: 气象出版社,2002, 第4 章.Wang Dong-xiao, Du Yan, and Shi Ping. Climatological Atlasof Physical Oceanography in the Upper Layer of the SouthChina Sea[M]. Beijing: China Meteorological Press, 2002,Charpter 4. [10] Gonzalez R C and Wintz P. Digital Image Processing [M].Reading, Massachusetts: Addision-Wesley PublishingCompany Advanced Book Program, 1977: 44-45.
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