Milli-HRG inertial navigation system

Meyer, A. D.; Rozelle, D. M.

doi:10.1109/plans.2012.6236860

Cited by 28 publications

(17 citation statements)

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“…Substituting it into (1), the vibration equation can be complied under the effect of single exciter of resonator. 2 = 2 = sin tan 2 2 ,…”

Section: Multielectrode Incentive Featuresmentioning

confidence: 99%

“…The hemispherical resonator gyro (HRG) is a solid state gyroscope whose sensing property is based on the vibration structure. It has the features of high accuracy, long life span, inherent high reliability, natural radiation hardness, and no parts that can wear out, which makes it very suitable for applications in long-time working state such as in space vehicles [1][2][3][4]. Particularly, over 125 spacecraft missions whose Space Inertial Reference Unit (SIRU) is based on HRGs have been launched successfully by NASA, Department of Defense (DOD) and so on.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Acceleration Influence on Hemispherical Resonator Gyro Forcing System

Xie

et al. 2015

Mathematical Problems in Engineering

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Acceleration adds negative effect to Hemispherical Resonator Gyro (HRG) output; therefore, it is important to model the influence and then make necessary compensations, accordingly. Based on the elastic thin-shell theory under the Kirchhoff-Love assumption, the acceleration influence on HRG forcing system is modeled and then schemes for incentive are suggested. Firstly, the dynamic model of resonator is introduced. Then, inertial load and electrostatic force are calculated to obtain the deformation of resonator. At last, schemes for pickoff incentive are proposed to weaken the effect of acceleration on HRG forcer. The simulation results illustrate that acceleration has negative effects on the exciting confidents of forcers and the proposed scheme can eliminate the acceleration influence on forcing system.

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“…Substituting it into (1), the vibration equation can be complied under the effect of single exciter of resonator. 2 = 2 = sin tan 2 2 ,…”

Section: Multielectrode Incentive Featuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Acceleration Influence on Hemispherical Resonator Gyro Forcing System

Xie

et al. 2015

Mathematical Problems in Engineering

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“…With that, presently available angular motion sensors, including microelectromechanical [17] and fiber-optic [18] ones, do not allow getting the necessarily high precision in use, which is connected to quite high self-noise of the corresponding equipment and low signal-noise ratio, which can be achieved experimentally. The use of more precise and, correspondingly, more expensive gyroscopes [19] considerably discredits the method idea as it does not result in the equipment cost-cutting.…”

Section: Introductionmentioning

confidence: 99%

Precession Azimuth Sensing with Low-Noise Molecular Electronics Angular Sensors

et al. 2016

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This paper describes the use of MET-based low-noise angular motion sensors to precisely determine azimuth direction in a dynamic-scheme method of measuring the Earth’s rotational velocity vector. The scheme includes sensor installation on a rotating platform so that it could scan the space and seek for the position of the highest Earth’s rotation vector projection on its axis. This method is very efficient provided a low-noise sensor is used. A low-cost angular sensor based on MET (molecular electronic transduction) technology has been used. The sensors of this kind were originally developed for seismic activity monitoring and are well known for very good noise performance and high sensitivity. This approach, combined with the use of special signal processing algorithms, allowed reaching the accuracy of 0.2°, while the measurement time was less than 100 seconds.

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“…1). Micro-HRGs and similar emerging axisymmetric 3D MEMS structures have garnered much interest [1][2][3][4][5][6][7][8][9], among other reasons, due to their potential for whole angle (WA) operation, side-stepping the need to integrate the gyro rate signal and the conversion of rate white noise into angle random walk. However, since the standing wave vibration pattern of the micro-HRG can be projected onto its two corresponding orthogonal but otherwise ideally-degenerate vibration eigenmodes, if one of these eigenmodes has a smaller coefficient of damping, the standing wave pattern will tend to align itself with this eigenmode as the other decays faster in amplitude, resulting in an apparent drift relative to the case [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of structural anisotropy on anchor loss mismatch and predicted case drift in future micro-Hemispherical Resonator Gyros

Sorenson

Ayazi

2014

2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014

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The effect of structural anisotropy leading to anchor loss mismatch in micro-Hemispherical Resonator Gyros (micro-HRGs) is investigated by developing an anchor loss model based on finite element analysis. Worst-case lower bound estimates for the anchor loss component of the quality factor (Q) are found based on the computed frequency difference between a clamped support and a free support interface. The Young's modulus of the finite element model is varied in a 4 th -harmonic pattern in the circumferential direction of the micro-HRG, resulting in splitting of the Q and resonance frequency of the otherwise degenerate gyro wineglass mode pair, allowing prediction of the case drift performance.

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Milli-HRG inertial navigation system

Cited by 28 publications

References 0 publications

Modeling of Acceleration Influence on Hemispherical Resonator Gyro Forcing System

Modeling of Acceleration Influence on Hemispherical Resonator Gyro Forcing System

Precession Azimuth Sensing with Low-Noise Molecular Electronics Angular Sensors

Effect of structural anisotropy on anchor loss mismatch and predicted case drift in future micro-Hemispherical Resonator Gyros

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