... resistant line 抗性系 preliminary orbit 初轨 quantitative character 数量特征 ...
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preliminary orbit determination 初步轨道决定
preliminary orbit calculation 初始轨道计算
preliminary orbit determination algorithm 初轨算法
·2,447,543篇论文数据，部分数据来源于NoteExpress
The result shows that using velocity measuring data after error correction in preliminary orbiting computation can effectively improve the orbit determination precision.
计算结果表明，使用经各种误差修正后的测速数据参与初轨计算能有效提高定轨精度。
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The Orion capsule, which is intended to carry at least four astronauts into Earth orbit and beyond, has completed its preliminary design review, or PDR.
BBC: Spaceship passes critical review
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