長基線によるDGPSの測位精度について : Guamでの測定結果を中心として

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  • On the Positioning Accuracy of DGPS in Case of Long Base Line : About Result of Measurement at Guam
  • チョウキセン ニヨル DGPS ノ ソクイ セイド ニ ツイテ Guam デ

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An Experiment of differential GPS (DGPS) to study the effects of distance (base line length) between a reference station and a user station, was conducted during January 10 to February 8 in 1996. The reference station was set in Tachikawa city and a survey vessel "Shoyo", Japan Maritime Safety Agency, was used as the user station. The GPS data was sampled in cruising and mooring condition at the port pier in Guam. The DGPS correction was made using the pseudo range correction value obtained from post processing. In this cruise, the maximum base line length was about 4, 000km. The results at Guam and in cruising at sea were reported, and the effects of base line length with respect to the DGPS positioning dispersion were discussed in this paper. From this experiment, it was found that the DGPS positioning dispersion increases linearly with base line length at a rate of 0.51m/100km. In addition, it was suggested that the deviation of the ellipsoidal height derived from the DGPS could be used as an index value of estimation for the DGPS horizontal positioning dispersion.

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