Houégnigan, L., Zaugg, S., van der Schaar, M., André, M. 3-D real-time algorithm based on array processing for the localization of cetaceans Proceedings of the 3rd International Workshop on Marine Technology, Martech 2009 , vol 8, p.101, Nov 2009 Abstract: Hydrophone arrays permit to localize populations of cetaceans in real-time to study their behaviour in a noninvasive way and to work on their conservation. The most commonly used method based on time-difference-of-arrival can be challenged by space-time methods which can locate several simultaneous sources and separate them spatially, but the implementation of the latter can be complex especially when the aperture of the array is large compared to the smallest wavelength in the signal (aliased array). Several space-time methods such as the Capon and Music estimators were implemented, but due to the array design which includes a microphone of lesser sensibility they gave poor results compared to what could be expected from simulations. This paper documents some results obtained qua bearing estimation of vocalizing mammals using a three-dimensional array with 4 hydrophones and a steered-power-response beamformer. Project: LIDO, Listening to the Deep-Ocean Environment