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Ref.: SiPLAB Report 02/08, FCT, University of Algarve,2008.
Abstract:The purpose of the MakaiEx sea trial was to acquire data over a large range of frequencies from 500 Hz upto 50 kHz, for a variety of applications ranging from high-frequency tomography, coherent SISO and MIMO applications, vector sensor and active and passive sonar, etc.
The MakaiEx sea trial took place off the coast of Kauai I., Hawai, from 15 September to 2 October, 2005, involving a large number of teams both from government and international laboratories, universities and private companies, such as HLS Research, UDEL, SPAWAR, NRL and SiPLAB. MIMO, Acoustical Oceanographic Buoy (AOB), Acoustic Communications and Data Storage, Acoustic sources Testebs, Gliders and Vector Sensor Array (VSA) were some of the equipment that was deployed during Makai and some of them served multiple purposes. This report describes the data acquired with the VSA as well as all the related environmental and geometrical data relative to the VSA deployments. It is also described a preliminary VSA data processing aiming at direction of arrival estimation for low frequency ship noise and high frequencies signals emitted by controlled acoustic sources. The estimation of bottom properties, using a method that consists in dividing downward by upward beam response, is also discussed. The bottom reflection loss deduced from experimental data is compared to the modelled reflection loss using the SAFARI model.