During naval operations, sonar performance\r\nestimates often need to be computed in-situ with limited environmental information. This calls for \r\nthe use of fast acoustic propagation models. Many naval operations are carried out in\r\nchallenging and dynamic environments. This makes acoustic propagation and sonar performance \r\nbehavior particularly complex and variable, and complicates prediction. Using data from a field \r\nexperiment, we have investigated the accuracy with\r\nwhich acoustic propagation loss (PL) can be predicted, using only limited modeling capabilities. \r\nEnvironmental input parameters came from various sources that may be available in a typical naval \r\noperation.\r\n<\/p>\r\n
\r\nThe outer continental shelf shallow-water experimental area featured internal tides, packets of \r\nnonlinear internal waves, and a meandering water mass front. For a moored source\/receiver pair \r\nseparated by 19.6 km, the acoustic propagation loss for 800\r\nHz pulses was computed using the peak amplitude. The variations in sound speed \r\ntranslated into considerable PL variability of order 15 dB. Acoustic loss modeling was carried out\r\nusing a data-driven regional ocean model as well as measured sound speed profile data for \r\ncomparison. The acoustic model used a two-dimensional parabolic approximation (vertical and \r\nradial outward wavenumbers only). The variance of modeled\r\npropagation loss was less than that measured. The effect of the internal tides and sub-tidal \r\n features was reasonably well modeled; these made use of measured sound speed data. The \r\neffects of nonlinear waves were not well modeled, consistent with\r\ntheir known three-dimensional effects but also with the lack of\r\nmeasurements to initialize and constrain them.\r\n<\/p>\r\n","protected":false},"excerpt":{"rendered":"
During naval operations, sonar performance estimates often need to be computed in-situ with limited environmental information. This calls for the use of fast acoustic propagation models. Many naval operations are carried out in challenging and dynamic environments. This makes acoustic propagation and sonar performance behavior particularly complex and variable, and complicates prediction. Using data from […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32,5,186,188],"tags":[102,104,103,105,101],"class_list":["post-2613","post","type-post","status-publish","format-standard","hentry","category-numerical-ocean-modeling","category-publications","category-computational-acoustics","category-proceedings-of-refereed-conferences-computational-acoustics","tag-acoustic-modeling","tag-internal-waves","tag-ocean-modeling","tag-shallow-water-acoustics","tag-sonar-performance-prediction"],"_links":{"self":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts\/2613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2613"}],"version-history":[{"count":12,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts\/2613\/revisions"}],"predecessor-version":[{"id":2986,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts\/2613\/revisions\/2986"}],"wp:attachment":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}