Method and device for earth acquisition using the pole star for a three-axis stabilized satellite in a low inclination orbit
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United States of America Patent
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Apr 16, 1996
Grant Date -
N/A
app pub date -
May 13, 1993
filing date -
May 19, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Earth acquisition from the Sun pointing attitude starts with angular displacement of the satellite so that, in the field of view of a Sun sensing system, the direction of the Sun is brought into an orientation S' such that subsequent rotation of the satellite about the orientation S' brings the Pole Star into the field of view of a star sensing system whose optical axis is substantially parallel to the pitch axis. During this rotation the stars sensed are compared with those in a catalog containing, in addition to the Pole Star, stars likely to be encountered upon such movement. At least two of these stars are identified and then the Pole Star is captured. The satellite is then rotated in pitch until the Earth is sensed and captured.
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