Method using double thruster firings to deadbeat flexible solar

Details Method using double thruster firings to deadbeat flexible solar Method using double thruster firings to deadbeat flexible solar

1997-12-24

1999-09-28

Jordan, Charles T.

Aeronautics and astronautics

Spacecraft

Attitude control

244164, 244172, 244173, B64G 126

Patent

active

059574119

ABSTRACT:
A spacecraft includes a plurality of thrusters mounted at predetermined locations on a spacecraft structure, individual ones the plurality of thrusters being fired for generating a torque about a desired axis. The firing of a thruster is partitioned into two firings that are offset in time by an amount .DELTA.t, wherein .DELTA.t=(1/2).times.(1/F).times.SF, where F is a dominant modal frequency, in Hertz, for any particular axis (nominally the 1st mode) of the spacecraft structure, and where SF is a scale factor that is adjustable about the frequency. In a presently preferred embodiment the thruster is a low thrust thruster that is mounted on a solar array panel, and the thrusters are fired in pairs.

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