@article {Raposo:2019:0736-2935:5028, title = "Ocean-acoustic Raytracing Propagation Models Based On Fermat's Least Time Principle", journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings", parent_itemid = "infobike://ince/incecp", publishercode ="ince", year = "2019", volume = "259", number = "4", publication date ="2019-09-30T00:00:00", pages = "5028-5038", itemtype = "ARTICLE", issn = "0736-2935", url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2019/00000259/00000004/art00004", author = "Raposo, Pedro and Gatta, M{\’a}rio and Moreira, Miguel", abstract = "Considering Fermat's least time principle we developed 2D and 3D ocean-acoustic raytracing propagation models. Each one consists of an algebraic differential system of equations. So, considering Fermat's least time principle we developed 2D and 3D ocean-acoustic parametric raytracing propagation models based on the Euler-Lagrange equations. Each one consists of an algebraic differential system of equations. Numerical simulations were presented, discussed and compared with propagation predictions obtained with a consolidated tool developed and utilized by the scientific community.", }