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題名:EXAMINATION OF ACCURACY AND EFFICIENCY OF THE GPS AS A SHIPBOARD NAVIGATOR UP TO EARLY 1992 IN TAIWAN REGION    
檢視1992年初臺灣附近海域全球衛星定位系統應用於船雙導航之有效性及準確度
著者:Gwo-Shyh Song(宋國士)
出版地區:台灣
出版城市:台北市
學科:地球科學
刊名:ACTA Oceanographica Taiwanica
卷期:28期(1992.3)
頁碼:102-117
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

利用C/A電碼全球衛星定位系統(GPS)接收器做三度空間/二度空間的船隻定位,不同測量方法的準確度及有效性於本文中予以檢視。至目前?止,在臺灣附近海域三度空間單點定位做法上,於點位精度因子(PDOP)?小於5時其誤差量有時仍會超過100公尺,並且其有效性(一天中可提供定位的小時數比)在觀測5°以上衛星?時只達約70%。相對定位怯(DGPS)在"SA"碼影響下仍能有效地使定位誤差減低至±5公尺,但基站及移動站必須於測量時段能同時觀測完全相同的衛星?。在不影響測量精確度下?了加?定位的有效性,本研究建議考慮在船隻定位時應觀測在大地精密測量時應忽略的低角度(小於5°)衛星;並且相對定位法的成敗因素,於船隻定位時,完全取決於基站應位於對低角度衛星無任何之遮蔽環境下作業?之。另外,於臺灣小區域沿海實施探測時,設定一預先測定的大地高程"h"(平均?20公尺)從事二度空間相對衛星定位在達到最高效率及精準度上?一最佳選擇。
C/A coded receivers were used to investigate accuracy and efficiency of positioning as a navigator on ships in 3D/2D GPS or DGPS measuring schemes. To date, in Taiwan offshore region 3D OPS may give over one hundred meters error of point positioning even at PDOP values lower than 5 and has an efficiency (hours positioning obtained in a day) at about 70% at satellite cutoff angle of 5°. DGPS reduces the positioning error significantly to about ±5 m with "SA" activated in the condition of both remote and reference receivers observing identical group of satellites. To enlarge efficiency of using GPS receivers without losing positioning accuracy, it is recommended to accept those low elevated satellites (lower than 5°) which are generally cut off during high precision geodetic carrier phase measurement; however, to ensure the task of DGPS efficiently accomplished, a proper site selected for reference station without any obstruction arround is most important. In addition, when doing survey in a limited area of Taiwan offshore, 2D DGPS with "height h'' set at a pre-measured height (averaging 20 m) is best choice giving high efficiency and good accuracy of the positioning.


    

本卷期目次
ACTA Oceanographica Taiwanica 28期 (1992.3)
DISTRIBUTION OF SUBSTRATES AND MACROBENTHOS AT DEPTHS BETWEEN 35 AND 120 M IN SOUTHERN TAIWAN/ Chang-Feng DaiLance L. StewartRichard A. CooperHelga J. Sprunk
EXAMINATION OF ACCURACY AND EFFICIENCY OF THE GPS AS A SHIPBOARD NAVIGATOR UP TO EARLY 1992 IN TAIWAN REGION/ Gwo-Shyh Song
臺灣東北海域冷水消長:1990年6~12月/ 龔國慶徐崇仁施文鴻劉康克
THE KAOHSIUNG SUBMARINE CANYON: A MODERN ABORTED CANYON AND ITS MORPHOLOGY AND ECHO CHARACTER/ Ho-Shing YuChar-Shine LiuJoun-Tai Lee
GEOLOGY OF THE TUNGYINTAO BASIN OFF NORTHWESTERN TAIWAN/ Ho-Shing Yu
EFFECT OF GRAIN SIZE ON THE DISTRIBUTION OF FATTY ACIDS IN COASTAL SEDIMENTS/ Woei-Lih Jeng
SPECIES OF MANGANESE, IRON, LEAD, CHROMIUM AND CADMIUM IN THE ANTARCTIC OCEAN AND TAIWAN ERHJIN CHI COASTAL SEDIMENTS/ Tsu-Chang HungPei-Jie Meng
UPTAKE AND REDUCTION OF NITRATE BY HYMENOMONAS SP. (PRYMNESIOPHYCEAE)/ Hsiu-Chun ChenRang HuangWoei-Lih Jeng
SCLERACTINIA OF TAIWAN Ⅲ. Family Agariciidae/ Chang-Feng DaiChia-Huey Lin
 
   
 
   

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