Browsing by Author "Hastrup, Ole F."

Now showing items 1-5 of 5

    • Acoustic bottom reflectivity 

      Hastrup, Ole F. (NATO. SACLANTCEN, 1989/06)
      Acoustic reflectivity from the seafloor is often an important factor influencing the performance of ASW systems in different environments, such as in deep water when the bottom bounce paths are used, and in general in ...

    • Distortion of bottom reflected pulses 

      Hastrup, Ole F. (NATO. SACLANTCEN, 1966/03)
      The theory of linear systems combined with numerical Fourier transformations and inversion is used to obtain the shape of a general pressure pulse after its reflection from a general multilayered sea floor. The method is ...

    • Fast Fourier transformation algorithms: experiments with microcomputers 

      Conolly, Brian W.; Hastrup, Ole F. (NATO. SACLANTCEN, 1986/07)
      We describe experiments intended to exploit the potential of modern

    • Impulse response of a layered bottom 

      Hastrup, Ole F. (NATO. SACLANTCEN, 1967/01)
      Numerical methods are used for the Fourier inversion of the frequency-dependent loss transfer function. Because of the non-zero finite values of the integrand for an infinite high frequency, the asymptotic value is subtracted ...

    • The influence of a low velocity layer on the reflectivity from the sea floor 

      Hastrup, Ole F. (NATO. SACLANTCEN, 1966/05)
      The influence on the reflectivity of a low velocity layer on top of a sand half-space has been investigated. By expressing sediment density and velocity in terms of porosity it has been possible to use this quantity as an ...