N2 - The normal modes cannot be extracted even in the Pekeris waveguide when
the source-receiver distance is very close. This paper introduces a normal
mode extraction method based on a dedispersion transform (DDT) to solve
this problem. The method presented here takes advantage of DDT, which is
based on the waveguide invariant such that the dispersion associated with
all of the normal modes is removed at the same time. After performing DDT
on a signal received in the Pekeris waveguide, the waveform of resulting
normal modes is very close to the source signal, each with different
position and amplitude. Each normal mode can be extracted by determining
its position and amplitude parameters by applying particle swarm
optimization (PSO). The waveform of the extracted normal mode is simply
the waveform of the source signal; the real waveform of the received
normal mode can then be recovered by applying dispersion compensation to
the source signal. The method presented needs only one receiver and is
verified with experimental data
JO - Archives of Acoustics
L1 - http://sd.czasopisma.pan.pl/Content/101362/PDF/02_paper.pdf
L2 - http://sd.czasopisma.pan.pl/Content/101362
IS - No 1
EP - 18
KW - normal mode extraction
KW - dedispersion transform
KW - Pekeris waveguide
KW - source ranging
ER -
A1 - Guang-Bing Yang
A1 - Lian-Gang Lü
A1 - Da-Zhi Gao
A1 - Ying Jiang
A1 - Hong-Ning Liu
PB - Committee on Acoustics PAS, PAS Institute of Fundamental Technological Research, Polish Acoustical Society
VL - vol. 40
JF - Archives of Acoustics
SP - 11
T1 - Dedispersion Transform Method for Extracting the Normal Modes of a Shallow Water Acoustic Signal in the Pekeris Waveguide
UR - http://sd.czasopisma.pan.pl/dlibra/docmetadata?id=101362
DOI - 10.1515/aoa-2015-0002