Invention Grant
- Patent Title: Singularity escape and avoidance using a virtual array rotation
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Application No.: US12573743Application Date: 2009-10-05
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Publication No.: US07974746B2Publication Date: 2011-07-05
- Inventor: Christopher J. Heiberg
- Applicant: Christopher J. Heiberg
- Applicant Address: US IL Chicago
- Assignee: The Boeing Company
- Current Assignee: The Boeing Company
- Current Assignee Address: US IL Chicago
- Agency: Caven & Aghevli LLC
- Main IPC: B64G1/28
- IPC: B64G1/28

Abstract:
Techniques for providing singularity escape and avoidance are disclosed. In one embodiment, a method for providing control moment gyroscope (CMG) attitude control singularity escape includes calculating a Jacobian A of a set of control equations, calculating a measure of closeness to a singularity, and comparing the calculated closeness to a threshold value, when the calculated closeness is less than or equal to the threshold value, recalculating the Jacobian A. Recalculating may include determining a new direction of virtual misalignment of β and γ, recalculating the Jacobian inputting the new direction of the virtual misalignment, recalculating the measure of closeness to a singularity, and comparing the measure of closeness to the threshold value. Further, the method may include calculating a gimbal rate command if the of closeness is greater than the threshold value and generating a torque from the gimbal rate command to control the attitude of a satellite.
Public/Granted literature
- US20100063653A1 SINGULARITY ESCAPE AND AVOIDANCE USING A VIRTUAL ARRAY ROTATION Public/Granted day:2010-03-11
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