@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/551ea875-44d5-4623-99f2-e52eac477661> a dcat:Dataset ;
    dct:description """
FUNCTION: Records underwater acoustic signals and has the
capability to time-reverse and re-broadcast these signals. This
provides the ability to focus and scan acoustic energy for the
detection of underwater objects. The signals can be emitted from
guide sources or received in the form of ocean reverberation.DESCRIPTION: The heart of the system is a 64-element transducer
array that can alternately operate as a receiver array or an array
of acoustic sources. The time-reversal functionality involves the
capability to record signals, reverse them in time, and then
re-broadcast them. This provides, for example, the capability to
have a received signal returned to its point of origin where it
will focus in both time and space. The importance of the concept is
that this can be accomplished without detailed knowledge of the
complex multipath structure produced by the ocean waveguide.
Applications include enhanced echos from target objects, such as
submarines or ocean mines, and reduced clutter echos from the ocean
bottom or ocean surface.INSTRUMENTATION:64 6-in. spherical source/receive elements in a linear array
with 1.25-m spacing (78.75 m aperture)Array elements independently controllable over the 500 to 3500
Hz frequency bandA data digitization and recording systemA pressure vessel to enclose system electronics for
bottom-moored deploymentFiber-optic umbilical cable for connection between pressure
vessel and ship/surface buoy.""" ;
    dct:identifier "551ea875-44d5-4623-99f2-e52eac477661" ;
    dct:issued "2025-11-29T21:12:16.318588"^^xsd:dateTime ;
    dct:modified "2025-11-29T21:12:16.318592"^^xsd:dateTime ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "Underwater Acoustic Time-Reversal Mirror" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn " " ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/551ea875-44d5-4623-99f2-e52eac477661/resource/5c0bb1df-06bd-46a7-89dc-b3fb7868f8de> ;
    dcat:keyword "amerigeo",
        "amerigeoss",
        "ckan",
        "geo",
        "geoss",
        "national",
        "north-america",
        "united-states" .

<https://data.amerigeoss.org/dataset/551ea875-44d5-4623-99f2-e52eac477661/resource/5c0bb1df-06bd-46a7-89dc-b3fb7868f8de> a dcat:Distribution ;
    dct:description "2008Facilities_revised.pdf" ;
    dct:format "PDF" ;
    dct:issued "2017-03-08T15:38:34.560612"^^xsd:dateTime ;
    dct:modified "2025-11-29T21:12:16.312254"^^xsd:dateTime ;
    dct:title "PDF File" ;
    dcat:accessURL <http://www.nrl.navy.mil/content_images/2008Facilities_revised.pdf> .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .