1 Ocak 2009 Dergi makalesi Açık Erişim

Song, H. C.; Hodgkiss, W. S.; Kuperman, W. A.; Akal, T.; Stevenson, M.

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  "@id": 95093, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "affiliation": "Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA", 
      "name": "Song, H. C."
    }, 
    {
      "@type": "Person", 
      "affiliation": "Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA", 
      "name": "Hodgkiss, W. S."
    }, 
    {
      "@type": "Person", 
      "affiliation": "Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA", 
      "name": "Kuperman, W. A."
    }, 
    {
      "@type": "Person", 
      "affiliation": "Earth & Marine Sci Res Inst, Marmara Res Ctr, TUBITAK MAN, Kocaeli, Turkey", 
      "name": "Akal, T."
    }, 
    {
      "@type": "Person", 
      "affiliation": "Spawar Syst Ctr, San Diego, CA 92152 USA", 
      "name": "Stevenson, M."
    }
  ], 
  "datePublished": "2009-01-01", 
  "description": "Time reversal communication exploits spatial diversity to achieve spatial and temporal focusing in complex ocean environments. Spatial diversity can be provided easily by a vertical array in a waveguide. Alternatively, spatial diversity can be obtained from a virtual horizontal array generated by two elements, a transmitter and a receiver, due to relative motion between them, referred to as a synthetic aperture. This paper presents coherent synthetic aperture communication results from at-sea experiments conducted in two different frequency bands: (1) 2-4 kHz and (2) 8-20 kHz. Case (1) employs binary-phase shift-keying modulation, while case (2) involves up to eight-phase shift keying modulation with a data rate of 30 kbits/s divided by the number of transmissions (diversity) to be accumulated. The receiver utilizes time reversal diversity combining followed by a single channel equalizer, with frequent channel updates to accommodate the time-varying channel due to coupling of space and time in the presence of motion. Two to five consecutive transmissions from a source moving at 4 kts over 3-6 km range in shallow water are combined successfully after Doppler compensation, confirming the feasibility of coherent synthetic aperture communications using time reversal.", 
  "headline": "High-rate synthetic aperture communications in shallow water", 
  "identifier": 95093, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "High-rate synthetic aperture communications in shallow water", 
  "url": "https://aperta.ulakbim.gov.tr/record/95093"
}