Additionally, a state-space observer was designed to estimate the sideslip angle, which was difficult to measure directly. 由于質(zhì)心側偏角信號難以直接測量，設計了狀態(tài)觀(guān)測器對該信號進(jìn)行估計。
The depression of the constellation fell below the horizon. 星座的俯角降到了地平線(xiàn)以下。
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