Acoustical Interference by Hull in LORAD Receiving Array.

Abstract

(1) The response of hydrophones is materially affected by proximity to the hull. Least interference was observed in the wing tips and at the blow. It is concluded that relocation of the present receiving array to the vicinity of Frame 3 should improve beam pattern response. (2) The array directivity patterns show high minor lobe levels as observed in earlier tests. This is attributed to hull shadowing. (3) The measured array gain is in good agreement with the gain calculated from the measured hydrophone responses. (4) The measured phase relations between hydrophones agree with phases calculated from the angle of arrival of sound, if the curvature of the wave front is taken into account. (5) A systematic difference of +1 degree between the zero points of the periscope and the acoustic bearings was established. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 15, 1963
Accession Number
ADA069143

Entities

People

  • Joel Wong
  • L. D. Morgan

Organizations

  • Navy Electronics Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Cameras
  • Diffraction
  • Electronics Laboratories
  • Frequency
  • Hydrophones
  • Measurement
  • Navy
  • Ordnance Laboratories
  • Photographs
  • Preamplifiers
  • Ships
  • Submarine Hulls
  • Submarine Warfare
  • Submarines
  • Test And Evaluation
  • Transducers

Readers

  • Acoustical Oceanography.
  • Aerodynamics/Aeronautics.
  • Phased Array Antenna Design.