What is MEMS Gyrocompassing? Comparative Analysis of Maytagging and Carouseling

Prikhodko, Igor P.; Zotov, Sergei A.; Trusov, Alexander A.; Shkel, Andrei M.

doi:10.1109/jmems.2013.2282936

Cited by 70 publications

(32 citation statements)

References 27 publications

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“…To improve the precision of seeking north with a middle-grade gyro, "carouseling," or multi-position method can be implemented [20]. Using only single fiber optical gyro and two MEMS accelerometers on a rotary platform, north orientation is accurately found by observing the horizontal component of the earth's rotation vector.…”

Section: North-seeking Principlementioning

confidence: 99%

North Finding System using Multi-Position Method with a 2-Axis Rotray Table for a Mortar

et al. 2016

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North-finding techniques involve detecting and calculating the azimuth angle, thus determining north using various kinds of sensors. North identification can be accomplished through the use of a digital magnetic compass. However, the accuracy of a magnetic sensor is easily degraded by spatial and temporal distortions due to ferrous material or electromagnetic interference. Moreover, GPS-based north-finding systems (NFSs) can accurately determine the azimuth by two separated GPS antennas. This still has a practical limitation in jamming or indoor environments, however. Therefore, an inertial NFS has been developed to replace the classic equipment used in estimating the fire direction of hand-carried projectile weapons such as with mortars. To improve the precision of seeking north with a middle grade gyro, multi-position method is implemented. Using only a single fiber optic gyroscope and two MEMS accelerometers on a rotary platform, the north orientation is accurately found by observing the horizontal component of the earth's rotation vector. With a minimum number of inertial sensors on a manual rotary platform, the NFS can be compact, light-weight, low-cost, and robust enough for easily portable mortar. Using additional auxiliary information which can be obtained by magnetic sensors, the time for locating north can be dramatically reduced. The test results compared with the navigation grade inertial navigation system show that a single digit mrad heading accuracy can be achieved. The operability of NFS mounted beside a mortar was tested in the field, in which the reference positions were acquired by DGPS (Differential GPS). To insure the durability in gun-fire shock, the drop-tower test was performed based on the shock profile measured in real mortar fire.

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Section: North-seeking Principlementioning

confidence: 99%

North Finding System using Multi-Position Method with a 2-Axis Rotray Table for a Mortar

et al. 2016

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“…This can be in the form of "carouseling" or "maytagging". Single digit mrad accuracy has been demonstrated by using stateof-the-art MEMS gyro-compassing with the carouseling technique [3].…”

Section: Mems Gyroscope For Mwd Toolmentioning

confidence: 99%

Robust MEMS gyroscope for oil and gas exploration

Lin

Miller

2014

SPIE Proceedings

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To satisfy the performance and reliability requirement of a MEMS based harsh environment sensor, the sensor development needs to depart from the classic method of single-discipline technology improvement. In this paper, the authors will describe a Microsystem-based design methodology which considers simultaneous multiple technology domain interaction and achieves performance optimization at the system level to address the harsh environment sensing challenge. This is demonstrated through specific examples of investigating a robust MEMS gyroscope suitable for high temperature and high vibration environments such as down-hole drilling for Oil and Gas applications. In particular, the different mechanisms of temperature-induced errors in MEMS gyroscope are discussed. The error sources include both the direct impact of the gyroscope dynamics by temperature and the indirect perturbation by temperature-induced package stress. For vibration and shock induced failure, the error contributions from the low frequency and high frequency contents are discussed. Different transducer designs with equivalent rate sensitivity can vary with several orders of magnitude in terms of the susceptibility to mechanical vibration. Also shown are the complex interactions among the gyroscopic transducer, packaging and the control electronics, resulting from these temperature and vibration error sources. The microsystem-based design methodology is able to capture such complex interactions and improve the gyroscope temperature and vibration performance. In contrast to other efforts in harsh environment sensing which focus on specific technology domains, the authors strive to demonstrate the need and advantage of addressing MEMS performance and reliability in harsh environment from a microsystem perspective.

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“…One prerequisite of achieving precise measurement results is that the rotating shafts of these instruments are aligned vertically. Take the north-finder which sets the initial orientation in targeting, pointing and inertial guidance, for instance, Prikhodko [3], Xie [4] and Arnaudov [5] adapted the multi-point measurement method to reduce the effect of gyroscope compass bias drift on azimuth measurements. They assumed the rotating shaft was perpendicular to the horizontal plane so that all measurements were performed in a local horizontal plane; however, in most cases, the angle between the rotating shaft and the horizontal plane does not equal to 90 degrees because of installation.…”

Section: Introductionmentioning

confidence: 99%

Rotating Shaft Tilt Angle Measurement Using an Inclinometer

Luo

Wang

Shen

et al. 2015

Measurement Science Review

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This paper describes a novel measurement method to accurately measure the rotating shaft tilt angle of rotating machine for alignment or compensation using a dual-axis inclinometer. A model of the rotating shaft tilt angle measurement is established using a dual-axis inclinometer based on the designed mechanical structure, and the calculation equation between the rotating shaft tilt angle and the inclinometer axes outputs is derived under the condition that the inclinometer axes are perpendicular to the rotating shaft. The reversal measurement method is applied to decrease the effect of inclinometer drifts caused by temperature, to eliminate inclinometer and rotating shaft mechanical error and inclinometer systematic error to attain high measurement accuracy. The uncertainty estimation shows that the accuracy of rotating shaft tilt angle measurement depends mainly on the inclinometer uncertainty and its uncertainty is almost the same as the inclinometer uncertainty in the simulation. The experimental results indicate that measurement time is 4 seconds; the range of rotating shaft tilt angle is 0.002° and its standard deviation is 0.0006° using NS-5/P2 inclinometer, whose precision and resolution are ±0.01° and 0.0005°, respectively.

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What is MEMS Gyrocompassing? Comparative Analysis of Maytagging and Carouseling

Cited by 70 publications

References 27 publications

North Finding System using Multi-Position Method with a 2-Axis Rotray Table for a Mortar

North Finding System using Multi-Position Method with a 2-Axis Rotray Table for a Mortar

Robust MEMS gyroscope for oil and gas exploration

Rotating Shaft Tilt Angle Measurement Using an Inclinometer

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