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平均运动

平均运动是表征一颗卫星绕其椭圆轨道运行速度的物理量。除了轨道是正圆形外,平均运动都是一个平均值,并不能反映出即时的角速率。

在卫星轨道参数中,平均运动的单位一般为“周期/天”。

计算公式

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其中

  • 引力常量
  • 为绕行天体的质量。
  • 半长轴

相关公式

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平均运动也可以用弧度或角度表达。其中P为绕行周期。

其中M1 和 M0 为在特定位置时一段时间t的平近点角。M0常常表示“某历元的平近点角”,t为该历元已经经历的时间。

参见

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平均运动
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