Data processing: measuring – calibrating – or testing – Calibration or correction system – Direction
Reexamination Certificate
2005-06-07
2005-06-07
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Calibration or correction system
Direction
C702S041000, C073S504020, C073S504080, C073S504180
Reexamination Certificate
active
06904377
ABSTRACT:
System and method for measuring force-dependent gyroscopic sensitivity. A force-effect model of the effects of acceleration on the output of a gyro triad is determined. Rotation sequences are then devised to permit excitation and observation of force-effect model parameters in order to provide calibration information for these parameters. A state diagram containing the gyro triad force-effect model parameters is derived from the force-effect model, where moving from one position in the state diagram to another position indicates the gyro triad error which would occur in rotating the gyro triad according to a corresponding motion. Searching for all possible closed loop paths achievable through the state diagram, by a multiple-axes rate table with a specified number of rotations, to separate gyro triad error calibration from the accelerometer calibration. Closed loop paths having minimal lengths and exhibiting larger error sensitivity are chosen to perform error parameter calibration and reduce force-dependent gyroscopic sensitivity.
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“Fast Orthogonal Calibration of a Ring Laser Strapdown System,” by John Mark, Daniel Tazartes, Timothy Hilby, Symposium Gyro Technology, Sep. 1986, Stuttgart, West Germany.
Liu G. Kevin
Mark John
Tazartes Daniel A.
Barlow John
Northrop Grumman Corporation
Walling Meagan S
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