Accession Number:

ADA125278

Title:

Sensitivity to Sound Speed of Surface/Bottom Reflecting Transmissions in a Deep Ocean Channel,

Descriptive Note:

Corporate Author:

RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATHEMATICAL SCIENCES

Report Date:

1983-02-01

Pagination or Media Count:

60.0

Abstract:

The sensitivity of oceanic sound transmissions to the choice of a sound-speed profile is analyzed using ray theory. The profile may be selected from a large depth-dependent collection which models the deep ocean sound channel. Sound propagation is examined between fixed source and receiver, both close to horizontal ocean boundaries, for ranges up to about 50 km. Given a specified profile, procedures are prescribed for constructing a second, simpler profile so that important acoustic quantities are virtually identical. The construction methods are easy to apply, have physical interpretation, and identify the critical aspects of profile data which influence transmissions. The ray geometries associated with the two profiles are shown to be very close. Useful formulas are derived which demonstrate that per-ray and total-field phases and amplitudes corresponding to the simpler profile approximate accurately those of the specified profile. Schemes are presented for determining range intervals for replacement of the given profile, based on specified tolerances for phase and amplitude differences. Thus, when our procedure is applied, propagation results are not sensitive to the type of profile selected. Author

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE