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Integrated Computational Formulae of Astronomical Vessel Position System with Developed Software in Navigation
|Contributors: ||NTOU:Department of Merchant Marine|
Astronomical vessel position system;Celestial body position predictiontheory;Sextant altitude correction theory;Sight reduction methodology
|Issue Date: ||2011-06-28T07:28:17Z
|Abstract: ||摘要:航海係為安全且經濟地導引海上運具將人或物從一港口移送另一港口的過程。目 前，船位的決定廣泛地使用全球定位系統，但因其軍事用途導致其在商業應用上的限 制。而天文觀測船位系統和全球定位系統之關係，就如同電腦作業系統的Linux 和 Windows 的關係。有鑑於此，研發電子數位化天文觀測船位系統實有其必要性。而伴隨 科技發展，運算工具呈倍速成長的年代，電子數位化計算整合系統卻不是主要的求解工 具；另外，搜尋國內外與天文觀測船位系統相關的大多數計算軟體，可發現均欠缺完整 性和彈性。這種期望和實際的落差所造成的問題，引發了本研究計畫起初的動機以及欲 完整地建構航海中天文觀測船位系統之計算整合及其軟體開發的想法。一個完美的天文 觀測船位系統包括了天體位置預測理論、六分儀高度修正理論及測天解算方法論等。由 於眾多的複雜且枯燥之計算程序，本研究計畫擬以三年期間來陸續建構完成。最後，本 研究計畫擬將各種理論予以程式化，並建構出一友善介面格式的天文觀測船位系統與圖 形顯示之套裝軟體，以期改善目前商船教育訓練或海上實務作業上航海的現況。|
Abstract:Navigation is the process of directing the moving marine vehicle from one port to another in a safe and economical way. The global position system (GPS, Glonass or Galilei) and astronomical vessel position (AVP) have been widely used to determine the vehicle positions, but both of them have its disadvantages. In addition, in an age of fast growing computer technology, computational approaches can be introduced to deal with this problem easily. These conditions initiated the research to develop the astronomical vessel position system (AVPS) to tackle the problems of the sailings. The basic inputs of AVPS are the apparent positions of navigational celestial bodies. Therefore, first of the three-year period project adapted two academic publications written by Jean Meeus as a major source and extracted the terminology, process, formulae and parameters for calculating the apparent position and developed two Navigational celestial bodies’ Apparent Position computing Software (NavAPS). Besides, this project used the apparent positions of navigational celestial bodies generated from the online ephemeris of the Jet Propulsion Laboratory of NASA as a criterion to examine the performance of the NavAPS 1, NavAPS 2 and the Nautical Almanac 2007 commercial edition (NA 2007), respectively. We adapted the paired data t test to understand their mean of difference between the criterion and the method mentioned above. In this way, the NavAPS 2 is the best of three and NA 2007 is better than NavAPS 1. Except the apparent position, the NavAPS could also obtain the horizontal parallax (HP) and Semi-diameter (SD) for correcting sextant altitude to observed altitude. The most important is the Software has a wide time-span from A.D. 1986 to A.D. 2050 and is able to calculate the apparent position of different bodies at one time. Thus the NavAPS 2 could replace the Nautical Almanac during the process of reducing AVP and had a wide application.
|Appears in Collections:||[商船學系] 研究計畫|
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