Array Simulation at the Bearing Stake Sites
Abstract
Acoustic pressures were computed at range-depth points to simulate narrowband, low frequency data (gathered by two long towed arrays), LATA, and OAMS. The pressures were computed with a normal mode program using environmental conditions that were observed during the Bearing Stake exercises. These data were processed by the same computer program used to process recorded data from the exercise. Comparisons between the computed and observed data indicate that a 1.5 degree tilt in LATA resulted in about 0.5 dB loss in array signal gain. A tilt of 1 degree in OAMS accounted for almost none of the observed loss. The loss in array signal gain of the computed data arises when multipath interference nulls occur at the array location. This effect does not account for a major part of the observed loss. Serpentine oscillations which can be seen in plots of coherence between element pairs can be simulated from the computed data by adding a second source separated from the first by a few degrees in azimuth. Some simulations of small amplitude array deformation showed only minor effects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1981
- Accession Number
- ADC025992
Entities
People
- D. Gordon