Boots – shoes – and leggings
Patent
1988-05-26
1990-06-05
Chin, Gary
Boots, shoes, and leggings
244164, 244170, B64G 138
Patent
active
049319426
ABSTRACT:
A method for controlling transition from thruster control to momentum wheel control to minimize nutation angle and transition time in a three-axis stabilized spacecraft employing an internal body fixed-momentum wheel as an attitude stabilizer. The method employs direct, substantially real-time measurement of momentum components and angular rates and generates paired roll thrust impluses and paired yaw thrust impulses in synchronization with the nutation period of the spacecraft to drive the spacecraft to a state of substantially zero nutation. The controller employs a deadbeat principle in a closed-loop real-time feedback system. In a preferred embodiment, the impulsive thruster firing commands in roll and yaw are simultaneous, spaced one-half nutation period apart in time with the effect that the target momentum is achieved in one to three pairs of impulse firings. The invention provides, with minimum transient overshoot, automatic reduction of angular momentum relative to a desired on-orbit state to a level which can be managed by a low-authority momentum wheel controller.
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Garg Subhash C.
Gretz Bruce D.
Allen Kenneth R.
Chin Gary
Ford Aerospace Corporation
Radlo Edward J.
Zerschling Keith L.
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