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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46897

Title: A Modified Sumner Method for Obtaining the Astronomical Vessel Position
Authors: Tien-Pen Hsu
Guo-Yu Weng
Chih-Li Chen
Contributors: 國立臺灣海洋大學:商船學系
Keywords: Sumner line
celestial navigation
running fix
iteration method
Date: 2017
Issue Date: 2018-06-11T02:12:24Z
Publisher: Journal of Marine Science and Technology
Abstract: Abstract: An adaptive boundaries technique (ABT) yielded by the geometrical properties of celestial triangles is proposed to deal with problems resulting from ex-meridian or meridian sights when the Sumner method is used. Due to the trial-and-error characteristic of the Sumner method, an iteration method is introduced to improve numerical accuracy. Combining the ABT and the iteration method into the Sumner method, this modified Sumner method (MSM) is developed so that it successfully determines the astronomical vessel position (AVP). Especially when the non-simultaneous sights condition is encountered, based on the running fix concept, middle-latitude sailing is adopted to translate Sumner points to the fix time for determining the AVP. A program developed using the proposed approach is implemented to solve the AVP problem. Three benchmark examples are conducted to validate the accuracy and versatility of the proposed approach.
Relation: 25(3) pp.319 - 328
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46897
Appears in Collections:[商船學系] 期刊論文

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