Abstract
Using data collected by a vertical line array (VLA) during an experiment conducted in the South China Sea, October 2011, source localization results obtained by the broadband incoherent conventional matched-field processor (MFP) method are presented and analyzed. The results indicate that the MFP method is practicable for sources at a range of less than 40 km. However, when the source range is beyond 40km, many of the estimated source locations are at the wrong peaks. Also a bimodal character emerges in most of the MFP outputs, and the distance between the two output peaks is about 30km. Excepting the environmental variables mismatch, it is proposed that in such environments there exists a periodic analogous sound field structure formed by the sea bottom reflection and that this explains the phenomenon on the basis of normal mode theory.
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