極軌道衛星系EPIRBの測位精度の向上について

DOI Web Site Web Site 被引用文献3件 参考文献7件

書誌事項

タイトル別名
  • An Improvement of Positioning Accuracy of a Polar Orbit Satellite EPIRB
  • 極軌道衛星系EPIRBの測位精度の向上について〔含 質疑応答〕
  • キョク キドウ エイセイケイ EPIRB ノ ソクイ セイド ノ コウジョウ
公開日
1995
DOI
  • 10.9749/jin.92.1
公開者
公益社団法人 日本航海学会

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説明

The dead reckoning position is not necessary in the principle of positioning by the polar orbital satellite system EPIRB. On the other hand, the dead reckoning position is needed in algorithm of NNSS, and positioning accuracy is better than that in EPIRB. Therefore, the position was roughly estimated using the time of the closest approach method. Then, using this position as the dead reckoning position, positioning was performed with NNSS algorithm. As the result, in a high angle of elevation, positioning error became about 0.1 nm (90% probability) in the latitudinal direction and about 0.3 nm in the longitudinal direction by measurement time of 6 minutes. Whereas in a low angle of elevation, error circle became about 0.4 nm. Further, it was found that positioning error occurred mainly in the longitudinal direction when the transmission frequency varied.

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