Browsing Reprints by Subject "Sonar mathematical models"

Now showing items 1-9 of 9

    • A general purpose software system for applications in different fields of physics 

      Ring, Poul B. (NATO. SACLANTCEN, 1979/12)
      The paper presents the principle of a software system (FTSS) developed by the Danish Defence Research Establishment (DDRE) for applications in different fields of physics. Software is made up by independent modules exchanging ...

    • Acoustic propagation models as viewed by the sonar systems designer 

      Reeves, J. L. (NATO. SACLANTCEN, 1971/12)
      The purpose of this paper is to consider the efforts performed in the development of ray acoustic propagation analyses from the viewpoint of advanced sonar system design. In particular, those parameters required of such ...

    • Assessment techniques for computer models of sound propagation 

      Wood, David H. (NATO. SACLANTCEN, 1975/10)
      Computer models of sound propagation have exactly three drawbacks: the model only approximates reality,the computer program only approximates the model, and the cost approximates infinity. The only way to assess these ...

    • Channel-adapted source for shallow water 

      Gingras, Donald F. (NATO. SACLANTCEN, 1993/08)
      In shallow water areas the utilization of active sonar is complicated by the fact that in these environments the performance of active systems is degraded by source signal interaction with channel boundaries. These boundary ...

    • High-speed simulation of an underwater acoustic field using an array processor 

      Kuperman, William A.; Jensen, Finn B.; Martinelli, Giovanna (NATO. SACLANTCEN, 1979/12)
      A computer model PAREQ for simulating the acoustic field of sound propagating in a complicated ocean environment has been installed on a realtime computer system (HP MX21) which includes an array processor (MAP 300). The ...

    • Model-aided data adaptive suppression of reverberation 

      Kirsteins, Ivars P. (NATO. SACLANTCEN, 1993/08)
      We propose a processing methodology which is based on the piece-wise modeling, adaptive estimation, and removal of reverberation components. An important feature of this approach is that backscatter models and information ...

    • Range and depth estimation by line arrays in shallow water 

      Klemm, Richard (NATO. SACLANTCEN, 1982/01)
      In shallow water sound propagates in terms of normal modes. The interference between the modes can be utilized to estimate range and depth of an acoustic source in shallow water by applying high resolution power estimators ...

    • Surface duct propagation loss measurements and model predictions at low and mid frequencies 

      Klingbeil, Delia H. (NATO. SACLANTCEN, 1993/08)
      Side-by-side measurements of low- and mid-frequency propagation loss were obtained during a sea test conducted in the North Atlantic during February of 1992. These measurements are compared to each other and with model ...

    • Wavefront curvature ranging as a passive synthetic aperture problem 

      Sullivan, Edward J. (NATO. SACLANTCEN, 1997)
      A new method of wavefront curvature passive ranging is introduced that is based on a model-based approach. The signal and measurement systems are placed into state-space form, thereby allowing the unknown parameters of the ...