| Patent application number | Description | Published |
|---|
| 20080223107 | Self-calibration of scale factor for dual resonator class II coriolis vibratory gyros - 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. | 09-18-2008 |
| 20080236242 | Self-calibrating accelerometer - The method and apparatus in one embodiment may have: a sensing element for an accelerometer having a bias, the sensing element having a rectangular plate supported by flexures which allow rotation about a transverse center line thereof; a center of mass (CG) of the sensing element having two stable positions, one on each side of an axis of rotation defined by a centerline of suspension; a secondary mass within a proofmass translates in-plane to move the center of mass to thereby effect a self-calibration mechanization that continuously measures and nulls the accelerometer's bias under dynamic operating conditions. | 10-02-2008 |
| 20080264168 | RING RESONATOR GYROSCOPE WITH CYLINDRICAL RING SUSPENSION - A ring resonator gyro comprises a cylindrical ring suspension. The cylindrical ring suspension supports a cylindrical ring resonator. The cylindrical ring resonator is coupled with an outer perimeter of the ring suspension. | 10-30-2008 |
| 20080295597 | System and Method for Mitigating Errors in Electrostatic Force Balanced Instrument - System and method for mitigating errors in electrostatic force balanced instrument is provided. The system and method mitigate errors in measurement readings caused by charge buildup in force balanced instruments that employ charge pulses to generate an electrostatic force to null an inertial proof mass disposed between opposing electrodes. The system and method mitigate charge buildup by applying charge pulses to each opposing electrode of a sensing element for a given charge cycle time period in a normal polarity configuration followed by charge pulses to each opposing electrode of the sensing element for a second given charge cycle time period in a reverse polarity conjuration. | 12-04-2008 |
| 20090031831 | Micro hemispheric resonator gyro - One embodiment is a micro hemispheric resonator gyro having: a plurality of pickoff and forcer electrodes; a hemispheric resonator; a guard ring having first and second opposed sides, the guard ring containing the plurality of pickoff and forcer electrodes, and the hemispheric resonator; a top cover operatively coupled to the first side of the guard ring; and a bottom cover operatively coupled to the second side of the guard ring; wherein the plurality of pickoff and forcer electrodes, the hemispheric resonator, the guard ring, the top cover and the bottom cover form a micro hemispheric resonator gyro. | 02-05-2009 |
| 20090033329 | Self-calibrating nuclear magnetic resonance gyro - The method and apparatus in one embodiment may have: a gyro housing containing a bias field; a bias field that generates a stable axial magnetic field; Xenon or other gas contained within at least a portion of the axial magnetic field, Xenon or other gas nuclear spins precessing at a constant angular rate with respect to the gyro housing in response to the axial magnetic field; wherein reversing a polarity of the bias field reverses a polarity of the magnetic field and a polarity of the precession of the Xenon or other gas nuclear spin, and wherein a reversing of the polarity of the gyro scalefactor thereby results without reversing a polarity of the gyro bias. | 02-05-2009 |
| 20090173157 | Capacitive bulk acoustic wave disk gyroscopes with self-calibration - The apparatus in one embodiment may have capacitive bulk acoustic wave disk gyro operated in a closed loop mode. A self-calibration system may be operatively coupled to the capacitive bulk acoustic wave disk gyroscope. Self-calibration of gyro bias of the gyro may be implemented by interchanging an anti-nodal axis with a nodal axis of the gyro. | 07-09-2009 |
| 20090293583 | Self-calibrating laser semiconductor accelerometer - A self-calibrating laser accelerometer system that continuously removes bias errors from acceleration measurements under dynamic operating conditions has a frame with a pair of essentially identical mass modulated accelerometers positioned within the frame. Each accelerometer includes a proof mass mounted to the sensing element frame by a flexure suspension. The proof mass is arranged to rotate about an output axis in response to acceleration of the sensing element frame along an input axis. The first proof mass includes a secondary mass that is movable between a first stable position on a first side of the output axis and a second stable position on a second side of the output axis to provide mass modulation of the first proof mass and to provide a selectively reversible polarity to the input axis and to provide self-calibration of bias. | 12-03-2009 |
| 20100071465 | Control component for planar resonator - A control component of an apparatus in one example is configured to signal a plurality of electrodes arranged in at least first, second, third, and fourth radial electrode groups along first, second, third, and fourth axes at approximately 0, 45, 90, and 135 degrees, respectively, around the planar resonator. During a first time period, the control component is configured to signal: the first radial electrode group to induce a drive oscillation in the planar resonator, the third radial electrode group to sense the drive oscillation, the second radial electrode group to sense a Coriolis force induced oscillation, and the fourth radial electrode group to null the Coriolis force induced oscillation. During a second time period after the first time period, the control component is configured to signal: the second radial electrode group to induce the drive oscillation in the planar resonator, the fourth radial electrode group to sense the drive oscillation, the first radial electrode group to sense the Coriolis force induced oscillation, and the third radial electrode group to null the Coriolis force induced oscillation. | 03-25-2010 |
| 20100218587 | Self-calibration of scale factor for dual resonator class II coriolis vibratory gyros - 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. | 09-02-2010 |
| 20110100121 | Vibratory gyro bias error cancellation using mode reversal - The method and apparatus in one embodiment may have: providing a two-dimensional axisymmetric oscillator having a beam containing two principal elastic axes and two principal damping axes; driving the beam with drive components to oscillate across corners of the beam at approximately 45 degrees to sides of the beam, the drive components having forcer components that provide drive and pickoff components that provide feedback; and oscillating the beam in a normal mode and a reverse mode. | 05-05-2011 |
