Browsing Reprints by Subject "Noise"

Now showing items 1-5 of 5

    • A noise directionality model including variable bathymetry 

      Harrison, Chris H. (NATO. SACLANTCEN, 1997)
      In this paper we investigate the noise directionality due to distributed surface sources m several envtronments with a uniformly sloping sea bed. Of particular interest are frequency dependence and the question of the ...

    • Effect of different bandwidths for the detection of extended targets in reverberation 

      Ries, S.; Schmidt-Schierhorn, H. (NATO. SACLANTCEN, 1993/08)
      In this paper, firstly the theoretical background of bandwidth effects on detection in noise and reverberation is presented in some detail, and secondly the relevant results of sea. trials with a low frequency active sonar ...

    • Performance assessment of broadband impulsive noise jammers 

      Heine, J.; Theriault, Kenneth B.; Boseck, D. (NATO. SACLANTCEN, 1993/08)
      A noise jammer raises the noise level observed by a threat sonar to degrade the sonar's detection performance. In this paper we assess the potential for a specific noise jammer waveform used to countermeasure low frequency ...

    • Statistical characterization of shallow-water bistatic sonar reverberation and noise 

      Pack, Kenneth D.; Turner, Michael V.; Ling, James M.; Monti, Joseph M. (NATO. SACLANTCEN, 1993/08)
      Shallow-water, low-frequency bistatic sonar measurements often exhibit high noise caused by bathymetric reverberation and other sources. Understanding the noise statistics is an essential first step in developing filters ...

    • The seamount as a noise barrier 

      Medwin, Herman; Childs, Emily; Jordan, Edgar A. (NATO. SACLANTCEN, 1982/06)
      When the path from a localized noise source is intercepted by a seamount the shielded noise consists of a diffracted component and, if the seamount is close to a sufficiently smooth ocean surface , a multiply-reflected ...