Underwater passive acoustic localization of pacific walruses in the northeastern chukchi sea
Mots-clés :
Uncertainty analysis, Chukchi Sea, Environmental parameter, Passive acoustics, Prior estimates, Propagation environment, Range-independent, Relative uncertainty, Summer months, Water depthRésumé
The article examines underwater passive acoustic localization of pacific walruses in the northeastern Chukchi sea. Environmental parameters and receiver parameters, in addition to walrus positions and vocalization times, are treated as unknowns and constrained with prior estimates and prior uncertainties. Three of these recorders were deployed approximately 400 m apart near the Hanna Shoal, a 30 m deep region of the Chukchi Sea where Pacific walruses are known to congregate during the summer months. Given that water depth was essentially uniform, a range independent propagation environment is assumed. Given the relative and absolute uncertainties, several observations can be made about the estimated track. The zig-zags in the track in the x-y plane are within relative uncertainties and, thus, are unlikely to be real.
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