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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Astral propagation model ： ウィキペディア英語版 Astral propagation model The Astral propagation model is an underwater sound propagation loss model. It began as a model for predicting range-smoothed (over 30–40 nm) propagation loss (PL) in a range dependent environment in the late 1970s and was developed by C. W. Spoffard.〔C. W. Spofford, (The ASTRAL Model, Vol. I: Technical Description ), Report SAI-79-742-WA, January 1979. Retrieved 20 August 2013〕 A convergence zone and surface duct capability was added〔D. White, ASTRAL 2.0: A Preliminary Report, Surface Ducts and Convergence Zone Modifications, Report SAIC-86/6562, December 1986〕 in the mid-1980s, after which it underwent testing by the US Navy along with range dependent Raymode and the Parabolic Equation (PE) model. As a result of these tests, ASTRAL became one of the official US Navy's range dependent PL models along with PE. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Astral propagation model」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.