Se. Dosso et al., HIGH-PRECISION ARRAY ELEMENT LOCALIZATION FOR VERTICAL LINE ARRAYS INTHE ARCTIC-OCEAN, IEEE journal of oceanic engineering, 23(4), 1998, pp. 365-379
Array element localization (AEL) surveys are often required to accurat
ely localize acoustic instruments (transponders or sensors) in the oce
an. These are typically based on transmitting or recording acoustic si
gnals from or at a set of well-known positions. A significant limiting
factor in many AEL surveys is the uncertainty inherent in these ''kno
wn'' positions. In this paper, an inversion algorithm is developed whi
ch properly treats both transponder anti sensor positions as unknowns.
subject to available a priori information in the form of position est
imates and uncertainties. The algorithm essentially consists of an ite
rative linearized inversion of the raytracing equations employing the
method of regularization. The approach is applied to independently loc
alize transponders and vertical line array (VLA) sensors that form par
t of a three-dimensional sensor array in the Arctic Ocean. Confidence
limits estimated via Monte Carlo simulation indicate that transponders
and sensors are localized to less than 1 m in three dimensions, The V
LA sensor motion, monitored over a seven-week period, appears to be pr
edominately driven by tidal cui rents and is consistent with historica
l current measurements for the region.