Accession Number:

ADA066653

Title:

Further Comments on Biological Backscatter.

Descriptive Note:

Technical memo.,

Corporate Author:

NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s):

Report Date:

1964-11-05

Pagination or Media Count:

3.0

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.

Subject Categories:

  • Biological Oceanography
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE