NNSSの定点における測位精度-I : 1周波処理と2周波処理の比較を中心に

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タイトル別名
  • Accuracies of Position Fixes obtained by Navy Navigation Satellite System at a Fixed Station I : Comparison of Accuracies between Fixes by Single Channel and Dual Channel Methods, and Others
  • NNSSの定点における測位精度-1-1周波処理と2周波処理の比較を中心に
  • NNSS ノ テイテン ニ オケル ソクイ セイド 1 1 シュウハ ショリ

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The satellite navigation set (TOSNAV-705S) has been installed in Kobe University of Mercantile Marine since the end of March, 1977. This set has the following characteristics; 400MHz/150MHz with dual channel, selectable five calculating modes and selectable auto-calculative function. Besides, this set has a function, called "Up-date position", which means the position recognized as an available position for renewing former one. Position data, in which 1155 data are selected as "Up-dated position" out of 2126 data obtained, have been gathered since 8th April in 1977, and the results obtained so far are summrized as follows; (A) Applying the single channel method (400MHz only), the positional error is highly correlated with the variation of ionosphere with time, but applying the dual channel method, no paticular relation is recognized between them. (B) With the dual channel method, as well known, the ionospheric correction is very effective at higher elevation angle, especially over 70 degrees. Even the position data obtained when the elevation angle are from 75 to 79 degrees, accuracies seem as sufficient as other "Up-date position" data.

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