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あらまし 現在規格化作業が行われている次世代 SBAS(Satellite-Based Augmentation System)では,SBAS 信号を送信する衛星に ついて静止衛星のみならず準天頂衛星を含む非静止衛星も許容される見込みである.ところが,規格案中の SBAS 衛星エフェメリスに 含まれるクロック補正パラメータについては非静止衛星について十分に考慮されておらず,定義域が不足することがわかった.この点を 改善するために,クロック補正パラメータについてビット数を増やす一方で他のパラメータのビット数を削減するようエフェメリスメッセージ の見直しを行ったので,その結果を報告する. Abstract The next generation SBAS Satellite-Based Augmentation System being discussed for international standardization is likely allowed to be transmitted from non-geostationary satellites as well as geostationary satellites. However, it is found that the clock correction parameters in the SBAS ephemeris message of the latest draft standards do not have enough dynamic range for nongeostationary satellites. The author has investigated a revision of the message to solve this point by adjustment of the number of bits for each ephemeris parameter and here reports the discussion. キーワード SBAS,DFMC,エフェメリス Keyword SBAS, DFMC, ephemeris

Ephemeris Message for the Next Generation SBAS