Airborne Surface Backscattering Strength Measurements in the Western Atlantic Ocean
Abstract
This report presents the results from a series of airborne, SUS-based acoustic surface backscattering strength tests conducted over the western Atlantic Ocean during April 1988. We describe the airborne technique used to gather the acoustic data and the environmental data (sound speed profiles and wind speed). Analysis provides information on sea surface acoustic backscattering strengths for mean grazing angles from 7 deg to 30 deg, wind speeds from 7 to 18 m/s, and frequencies from 50 to 800 Hz. The data analysis procedure is outlined, and the results are compared to first-order perturbation theory (air-water interface scatter), the Chapman-Harris empirical formula, and the Ogden-Erskine empirical algorithm. The absolute error in measured scattering strengths is approximately + or - 5 dB. The data comparison emphasizes the use of wind history as an environmental predictor of surface scattering. The results are summarized, and a list of the lessons learned concerning the experimental technique is provided. Brief analyses of the sound speed profiles and wind speed data are appended.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 17, 1993
- Accession Number
- ADA271737
Entities
People
- Fred T. Erskine
- John P. Crockett
- Peter M. Ogden
Organizations
- United States Naval Research Laboratory