Method and device for earth acquisition using the pole star for

Details Method and device for earth acquisition using the pole star for Method and device for earth acquisition using the pole star for

1993-05-13

1996-04-16

Chin, Gary

Boots, shoes, and leggings

364455, 244164, 244171, G06F16500, B64G 134

Patent

active

055089321

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.

REFERENCES:
patent: 4617634 (1986-10-01), Izumida et al.
patent: 4621329 (1986-11-01), Jacob
patent: 4746976 (1988-05-01), Kamel et al.
patent: 5107434 (1992-04-01), Paluszek
patent: 5109346 (1992-04-01), Wertz
patent: 5177686 (1993-01-01), Boinghoff et al.

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