Controlling rotation of a spacecraft
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United States of America Patent
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-
Jan 25, 2000
Grant Date -
N/A
app pub date -
May 12, 1997
filing date -
May 17, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An earth orbiting satellite is enabled to assume a 'survival mode' of operation in which its x axis is aligned with the sun by observing characteristics of the movement of the frame of the satellite (e.g. its x axis) relative to the sun and performing calculations based on those operations. A more accurate result is achieved if a deliberate offset is introduced between the mean direction of the x axis and the sun's direction. The control arrangement for positioning the x axis with this offset is preferably adaptive, resulting in control of the satellite's thrusters so as to produce oscillation of the x axis in a way which allows suitable measurements to be taken.
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