Self-calibration of scale factor for dual resonator class II Coriolis vibratory gyros
First Claim
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1. An apparatus, comprising:
- a first resonator receiving on an input thereof an angular rate, said first resonator operating in a closed loop mode during a first time interval and in an open loop whole angle mode during a second time interval;
a second resonator receiving on an input thereof the angular rate, said second resonator operating in an open loop whole angle mode during a first time interval and in a closed loop mode during a second time interval; and
scale factor calibration unit operatively coupled to the first and second resonators;
wherein by alternately proceeding between open and closed loop operation, each of the first and second resonators scale factor may be self-calibrated.
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Abstract
The method and apparatus in one embodiment may have: operating one of two resonators of a class II coriolis vibratory gyro in a closed loop mode and another of the two resonators in an open loop whole angle mode; sensing an angular rate by each of the two resonators; calibrating the scale factor of the closed loop resonator to yield the same integrated whole angle as measured by the open loop resonator; reversing operation of the two resonators such that the one of two resonators is operated in an open loop mode and the another of the two resonators in a closed loop whole angle mode; and alternately proceeding between open and closed loop operation of the two resonators, thereby self-calibrating scale factors respectively of the two resonators.
27 Citations
10 Claims
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1. An apparatus, comprising:
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a first resonator receiving on an input thereof an angular rate, said first resonator operating in a closed loop mode during a first time interval and in an open loop whole angle mode during a second time interval; a second resonator receiving on an input thereof the angular rate, said second resonator operating in an open loop whole angle mode during a first time interval and in a closed loop mode during a second time interval; and scale factor calibration unit operatively coupled to the first and second resonators; wherein by alternately proceeding between open and closed loop operation, each of the first and second resonators scale factor may be self-calibrated. - View Dependent Claims (2, 3, 4)
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5. An apparatus, comprising:
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a first resonator receiving on an input thereof an angular rate, said first resonator operating in a closed loop mode during a first time interval and in an open loop whole angle mode during a second time interval; a second resonator receiving on an input thereof the angular rate, said second resonator operating in an open loop whole angle mode during a first time interval and in a closed loop mode during a second time interval; scale factor calibration unit operatively coupled to the first and second resonators; and a bias self-calibration unit operatively coupled to the first and second resonators and having an input for receiving a signal indicative of motion of an inertial system; wherein by alternately proceeding between open and closed loop operation, each of the first and second resonators scale factor may be self-calibrated, and wherein scale factor self-calibration is combined with bias self-calibration for a mode of operation. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification
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Current AssigneeNorthrop Grumman Guidance And Electronics Company, Inc.
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Original AssigneeNorthrop Grumman Guidance And Electronics Company, Inc.
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InventorsStewart, Robert E.
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Primary Examiner(s)Raevis, Robert R
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Application NumberUS12/800,090Publication NumberTime in Patent Office683 DaysField of SearchNoneUS Class Current73/1.37CPC Class CodesG01C 19/5776 Signal processing not speci...G01C 25/005 initial alignment, calibrat...
