Abstract
A drifting sensor network, such as hydrophones mounted on autonomous underwater vehicles or drifting buoys, can be used as a random volumetric array for locating underwater acoustic sources. However, navigational uncertainties of mobile platforms underwater limit the positioning accuracy of their acoustic sensors. Precise positioning is required to perform coherent processing for sound source localization using this random volumetric array. It has been shown that ambient ocean noise correlations between fixed receivers can provide additional inter-element distance information to perform array element self-localization [Sabra et al., IEEE J.Ocean Eng., 30 (2005)]. An extension of this approach for an array of drifting sensors will be proposed by optimizing the required averaging duration to account for sensor drift motion. Performance of this proposed approach will be demonstrated using at-sea data collected in the Long Island Sound.
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