Further Comments on Biological Backscatter.
NAVY UNDERWATER SOUND LAB NEW LONDON CONN
Pagination or Media Count:
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.
- Biological Oceanography
- Acoustic Detection and Detectors