THE APPLICATION OF SEISMOMETERS TO ARCTIC ASW - AN ANALYTICAL STUDY
Abstract
In ice-covered waters the usefulness of hydrophones is limited by the necessity to create or to locate openings through which the sensors can enter the water. But ability to detect submarines in Arctic waters is important. For this reason the effectiveness of an on-ice sensor, namely, the geophone, has been studied analytically toward the assessment of its feasibility. Comparisons were made between meager measurements of ice noise reported in the literature and signal levels calculated from normal mode theory. The studies indicate that a submarine emitting one-watt or more at 7 or 8 Hz, a frequency range of low natural noise, might be detectable at a range of 1 km and possibly as large as 30 km. Noise data is lacking particularly for shallow water areas, where the geophone seems most useful, and experimental measurements are recommended using three component geophones. No matter what the signal-to-noise ratio, array processing can be used to enhance the probability of recognizing a submarine. However, the acoustic environment causes dispersive waves and this would add to the operational difficulties.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1967
- Accession Number
- AD0380954
Entities
People
- Norman E. Goldstein
Organizations
- SRI International