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星光—惯性制导是天文制导与惯性制导的结合,故称为星光—惯性组合制导。这种系统利用恒星作为固定参考点,飞行中用星光跟踪器观测星体的方位来校正惯性基准随时间的漂移,以提高导弹的命中精度。星光—惯性制导比纯惯性制导精确的原因在于在惯性空间里从地球到恒星的方位基本保持不变。因此,星光跟踪器就相当于没有漂移的陀螺。虽然象差、地球极轴的进动和章动、视差等因素使恒星方向有些微小的变化,但是,它们所造成的误差远小于1弧秒。所以,使用星光—惯性制导可以克服惯性基准漂移带来的误差,这是该制导系统的主要优点之一。
Starlight - inertial guidance is the combination of astronomy guidance and inertial guidance, it is called star - inertial combination guidance. This system uses stars as a fixed reference point. In flight, a star tracker is used to observe the orientation of the stars to correct the drift of the inertial reference over time, so as to improve the missile hit accuracy. Starlight - Inertial guidance than pure inertial guidance accuracy is that in inertial space from the Earth to the star’s orientation remained essentially unchanged. Therefore, Starlight Tracker is equivalent to no drift of the top. Although aberrations, the precession of the Earth’s polar axis, and nutation, parallax and other factors make a slight change in the direction of the stars, they cause much less than 1 arc second error. Therefore, the use of star-inertial guidance can overcome the error caused by inertial reference drift, which is one of the main advantages of the guidance system.