{"refrec":{"BRefID":247346,"RR":"<b>Candy, J.V.; Ren, Q.; Hermand, J.-P.</b> (2013). Passive vector geoacoustic inversion in coastal areas using a sequential unscented Kalman filter, <b><i>in</i></b>: <i>IEEE SYMPOL Conference Cochin, India October 23, 2013 through October 25, 2013.</i> pp. 6 pp","BEntID":239047,"PublicFlag":1,"CheckedFlag":1,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: <i>IEEE SYMPOL Conference Cochin, India October 23, 2013 through October 25, 2013.</i> pp. 6 pp","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Candy, J.V.; Ren, Q.; Hermand, J.-P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Candy, J.V. <i>et al.</i>","Englishabstract":"An unscented Kalman filter (UKF) for geoacoustic inversion using scalar and vector sound fields created by a passing ship is discussed in this paper. The continuous sound field emitted by a ship of opportunity is processed by the sequential filtering technique to estimate slowly changing environmental properties along the source range. The inversion problem is solved by the UKF with a random-walk parameter model, which is expected to perform well when dealing with highly nonlinear problems. Synthetic geoacoustic inversions are performed using multi-frequency pressure, vertical particle velocity and waveguide impedance (a ratio between pressure and vertical particle velocity) data for the geoacoustic model of a mud environment offshore at the mouth of the Amazon river in Brazil (CANOGA 12). For the preliminary tests, the sound source is composed of a flat spectrum. Numerical results demonstrate that the sequential filtering technique is capable of estimating the evolution of environmental properties along the source range. In practice, ship data have complex time-varying spectral characteristics that can greatly limit the accuracy of broadband or multi-frequency passive applications. Since the vertical waveguide impedance is independent of the source spectral level, it is preferred for environmental characterization by the sound field generated from a ship of opportunity. Because of this independence property, the vertical waveguide impedance is expected to yield a more reliable inversion than that of pressure or vertical particle velocity field. 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