An Analysis of Surface-Duct Propagation Loss Modeling in SHARPS
Abstract
The propagation submodels of the Ship Helicopter Acoustic Range Prediction System (SHARPS) are reviewed within the context of their effectiveness in making accurate predictions for surface-duct environments. The surface-duct propagation loss calculations performed by SHARPS are based on the submodels contained in Active RAYMODE. Fleet messages have been critical of SHARPS target detection range predictions for in-layer and cross-layer sonar- target geometries. A review is presented of those computational methods common to both Active and Passive RAYMODE, most likely to affect surface-duct predictions, and includes a summary of the main features of a surface-duct leakage subroutine found in one of the previous versions of Passive RAYMODE. A means of coupling surface-scattered energy into the normal mode sum is reviewed. The possibility of 'anomalous' surface-duct predictions is briefly addressed and several ways to achieve improved surface-duct propagation loss predictions are recommended.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA239802
Entities
People
- Robert W. Mcgirr
Organizations
- United States Naval Research Laboratory