Acoustic Tomography with Navy Sonars

Data will be collected from a variety of Navy sonars. Traditional means to process the signals will be done including beamforming, coherent averaging when dealing with periodic signals, correcting for Doppler shifts when dealing with mobile sonars, and matched filtering when a replica with the emitted waveform is available. The data will be interpreted using rays and the sound speed insensitive parabolic approximation Tappert et al. 1995 . The acoustic models will be used in conjunction with oceanographic models that contain the best available digital data sets for bathymetry, sound speed fields that vary with range and depth, and internal waves. Spatial coherence will be modeled using the sound speed insensitive parabolic approximation and spectra of internal waves.