Publications
Sensitivity issues in acoustic mode tomography
Abstract
Ocean acoustic mode tomography relies on a high signal to noise ratio and an accurate measure of the time of arrival for the mode signals. The low-order modes measured during tomography experiments such as the 2004 long range ocean acoustic propagation experiment (LOAPEX) are sensitive to environmental and experimental conditions. For example, internal waves can cause mode coupling and time of arrival perturbations. The source and the VLA move due to currents and tides, which results in Doppler spreading and frequency selective fading. Uncertainties in the signal affects the accuracy of tomographic methods. Previous work [Chandrayadula et al., J. Acoust. Soc. Am. 121, 3053 (2007)] mainly focused on building a channel model for the internal wave effects. This paper extends the previous work by building a more complete channel model that also includes the effects due to residual source/receiver motion. The statistics from the channel model are used to study the effect of uncertainties on the mode signals measured during LOAPEX. [Work supported by ONR Ocean Acoustics Graduate Traineeship Award.]
© 2008 Acoustical Society of America. This abstract may be downloaded for personal use only. Any other use requires the permission of the author and the Acoustical Society of America. The abstract appeared in the Journal of the Acoustical Society of America, vol. 124(4), p. 2444, October 2008 and may also be found on the JASA website.