Abstract
Array processing techniques in shallow water often require knowledge of the spatial coherence of sound propagation. However, few wideband data sets on this subject have been published. As a part of the ASIAEX program in the East China Sea, wideband sound propagation measurements were conducted in June 2001 along three radial directions and along a circle with a radius of 30 km. An earlier related paper dealt with reverberation data from this experiment [J. X. Zhou and X. Z. Zhang, J. Acoust. Soc. Am. 113, 2204 (2003)]. This paper analyzes sound propagation vertical coherence (SPVC) as a function of frequency, range, and propagation direction. Then the SPVC is used to invert bottom sound speed and attenuation. The results show that the characteristics of the SPVC and the SPVC-inverted bottom acoustic parameters agree well with geological survey and sediment cores in the ASIAEX area. [Work supported by ONR and NNSF of China.]
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