The ASTRAL Model. Volume 1: Technical Description

Abstract

This report documents the development and evaluation of a new long- range propagation-loss model - ASTRAL (ASEPS Transmission-Loss). ASTRAL has been developed to meet the need for an accurate, high-speed fully automated model capable of predicting range-smoothed (over 30-40 nm) propagation loss in a range-dependent environment. It is being incorporated in the ASEPS Fleet Support model at FNWC Monterey, however it may also be used independent of ASEPS in a stand-alone mode. ASTRAL assumes adiabatic invariance in propagating mode-like envelopes through a fully range-dependent environment. Initial excitation of these quasi-modes (by the receiver, invoking acoustic reciprocity) can include ray-angle conversion effects on a slope immediately in front of the receiver. The mode envelope functions are computed for several source depths and frequencies simultaneously and include surface-image interference as well as diffraction.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1979
Accession Number
ADA956124

Entities

People

  • C. W. Spofford

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Agreements
  • Algorithms
  • Diffraction
  • Distribution Functions
  • Geography
  • Geometry
  • Grazing Angles
  • Losses
  • Navy
  • Oceans
  • Physics
  • Physics Laboratories
  • Second World War
  • Standards
  • Test And Evaluation
  • Transmission Loss

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.