Further Comments on Biological Backscatter.

Abstract

More recent work necessitates a reassessment of the effect of biological backscatter on the SQS-26. Results indicate that it is not unlikely for this scattering peak to shift to the 3 - 4 kc region at night. In one case where the peak shifted to 3.5 kc, the day-night variation was 18 db. The typical DSL surface scattering strength per square yard (integrated over the volume of the layer) was - 41 at night and - 59 in the day. Considering the 4 paths involved, the nighttime level would be equivalent to a sea-surface scattering strength of - 35, that produced by a 20-knot wind for a typical SQS-26 search angle of 15 degrees. This is 8 db higher than previously estimated for the nighttime level.

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Document Details

Document Type
Technical Report
Publication Date
Nov 05, 1964
Accession Number
ADA066653

Entities

People

  • B. F. Cole
  • T. G. Bell

Organizations

  • Navy Underwater Sound Laboratory

Tags

DTIC Thesaurus Topics

  • Backscattering
  • Deep Scattering Layers
  • Depth
  • Frequency
  • Intensity
  • Measurement
  • Resonance
  • Reverberation
  • Scattering
  • Shallow Depth

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Oceanography.
  • Solar Physics