AD-A267 300 DTIC11111ELECTrE1111111 1 II~I 11 I I U- _ '•JUL2 91993 Sound Speed Profiles from Vertical Array Data •_:C QUALITY L.,.OaV17jD 5

A scheme for extracting sound speed information from vertical arrays in shallow water is examined. The scheme hinges on the covariance matrix of the pressures received at the array being diagonal in the modes of the water column, and involves computing second derivatives of the covariance. Conditions under which the covariance might be mode-diagonal are examined. It is found that without attenuation, it is unlikely to find mode-diagonal covariances. However with reasonable attenuations, the covariance will be dominated by the lowest mode. The scheme described here is applied to vertical array data taken in 1985. Statement A per telecon Bruce Pasewor