Detection and Measurement of Shallow Water Explosive Sounds Received at an Array of Geophones and Hydrophones.
Abstract
This report contains results of an analysis of seismic and hydroacoustic signals received, at the Naval Coastal Systems Center Stage I array, from a series of shallow water explosions in the Gulf of Mexico. A variety of signal processing techniques were employed to determine the degree of gain realizable, and to characterize the received signals and their propagation paths. Techniques included spectral analysis, coherent crosscorrelative velocity filtering, and polarization filtering. It was found that roughly comparable gains were achieved, using correlation techniques, for both the geophone and the hydrophone signals. The same analysis indicated, however, that the hydrophone signals had relatively larger signal-to-noise ratios than did the geophone signals. Reasonable agreement was obtained, where measurements were possible, between seismic mode propagation speeds as determined by travel time-distance and by coherent correlative beamforming methods. Certain aspects of the signals, most likely attributable to post-experiment data contamination from an unknown origin, had significant effects on processor performance. For this reason, decisive judgments were not made regarding relative merits of geophones versus hydrophones, in this study. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 16, 1981
- Accession Number
- ADA095978
Entities
People
- J. F. Green
- L. C. Weltman
- T. J. Cohen