Accession Number:

ADA237976

Title:

Shallow Water RASP Upgrade

Descriptive Note:

Final rept.

Corporate Author:

NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS

Personal Author(s):

Report Date:

1991-05-01

Pagination or Media Count:

38.0

Abstract:

The Range Dependent Active System Performance model RASP has been modified to function at higher frequencies in shallower water than its initial design specification. The major difficulties in the original version of the model were the control of the cubic spline fitting routines to the sound speed points, extension of attenuation coefficients to higher frequencies and the need to interface to Navy standard data bases or models for bottom loss calculations. These two areas of difficulty were overcome using a front end sound speed fitting algorithm based on cubic splines under tension to control the oscillations in the spline fits in the model, and subroutines to allow input of standard bottom loss curves. The resulting modifications to the model created a model capable of predicting range dependent monostatic reverberation with reasonable accuracy at frequencies up to kHz. The modifications did not address the broader problem of bistatic range dependent reverberation at high frequencies or in shallow water, or the problem of energy splitting loss on predicted target returns.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE