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以X射线脉冲星或其他宇宙X射线源辐射的X射线光子作为观测信号,通过X射线探测器获取脉冲到达时间/方向等观测量,经过数据处理自主确定航天器位置、姿态和时间等参数的方法或过程。
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Paris Aviation Convention
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PA-RISC instruction set
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PA-RISC指令集
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