Reverberation measurements in the ocean with a source-receiver array

Abstract

During our time reversal experiment (TREX-03) conducted in May 2003 off the New Jersey coast, a 64 channel midfrequency source-receiver array (SRA) was deployed to measure reverberation and test the focusing capabilities of an SRA in the ocean without explicitly introducing a known probe source. Previous simulations [J. Acoust. Soc. Am. 111, 2609–2614 (2002)] and laboratory experiments [J. Acoust. Soc. Am. 113, 3155–3160 (2003)] have shown that the monostatic reverberation signal due to a rough interface can be decomposed to yield SRA source functions that will focus energy at the interface. The range of the focus is controlled by time windowing the reverberation signal. Additionally, measured environmental data (sound-speed profiles and geo-acoustic parameters) were used to estimate the SRA source weights for focusing at targets that were deployed in the water column and on the bottom. [Work supported by ONR.]