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Inertial reference unit

About: Inertial reference unit is a research topic. Over the lifetime, 1306 publications have been published within this topic receiving 22068 citations. The topic is also known as: IRU.


Papers
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Proceedings ArticleDOI
07 Aug 1995

4 citations

Proceedings ArticleDOI
23 Jun 2003
TL;DR: In this article, the covariance analysis is applied to the performance of spacecraft attitude control systems, and the results computed by the analysis are compared with the results calculated by the Monte-Carlo simulation.
Abstract: The covariance analysis is applied to the performance of spacecraft attitude control systems. Subsystem considered here are the spacecraft bus, attitude controller, reaction wheel assembly, star-tracker unit, inertial reference unit, and gyro drift estimator. The results computed by the covariance analysis are compared with the results computed by the Monte-Carlo simulation. The covariance analysis is shown to be useful for studying the effects of system parameters on attitude control performance.

4 citations

Book ChapterDOI
01 Jan 2007
TL;DR: A novel 3-axis rate gyroscope realised in one plane, on a single die, is being developed with a reduction of the package size of multiaxial MEM sensors is achievable at least by a factor of ten.
Abstract: This paper presents the development of systems monitoring human body motions and postures for clinical purposes. The hardware for these applications exploits a newly released commercial Micro-Electro-Mechanical (MEM) 3-axis accelerometer and a MEM 3-axis rate gyroscope being developed by HSG-IMIT. First the paper gives an overview of wearable 3-axis accelerometer systems and the corresponding data storage and transmission developed by ETB. The main part of the paper describes the design of the 3-axis rate gyroscope to be implemented in an Inertial Measurement Unit (IMU) for the body motion monitoring. Such health applications require IMUs of very low size to be able to fix the sensor cluster to the human being. This prevents the use of state-of-the-art IMUs implemented by three perpendicular orientated rate gyroscopes for this purpose. Thus a novel 3-axis rate gyroscope realised in one plane, on a single die, is being developed. With this device a reduction of the package size of multiaxial MEM sensors is achievable at least by a factor of ten. A further advantage of this approach is the reduced cost due to the omission of a spatial configuration and due to the small dimensions. Finally the synthesis of the 3-axis accelerometer and the 3-axis rate gyroscope to an IMU for monitoring 3D body segment orientation is addressed.

4 citations

Journal Article
TL;DR: In this article, the state space equation is augmented by the filter states, and the linear quadratic regulator (LQR) method is used to design the feedback gain matrix for the momentum management controller of space station in inertial reference.
Abstract: For saturation of control moment gyros because of accumulation of constant component of gravitational torque and aero torque,a dynamics model of space station is established and linearized in inertial reference,then the state space equation is augmented by the filter states,and the linear quadratic regulator(LQR) method is used to design the feedback gain matrix for the momentum management controller of space station in inertial reference.In inertial reference the gravitational torque and aero dynamical torque are composed by multiples of frequency of orbit angular velocity,so the augmented filters can be selected according to the actual disturbance frequency to reduce the influence of different disturbing torgues on attitude of space station or momentum of control moment gyros,thus the space station can maintain attitude control without disaturation for long time.Simulation validats the controller.

4 citations

Patent
Caron Jean-Michel1
07 Aug 2007
TL;DR: In this article, the method of aligning an inertial unit having an axially symmetrical vibrating sensor that generates vibration comprises the step of establishing the vibration in a position for which the sensor presents variation in drift error that is the smallest relative to variation of drift error for other positions of the vibration.
Abstract: The method of aligning an inertial unit having an axially symmetrical vibrating sensor that generates vibration comprises the step of establishing the vibration in a position for which the sensor presents variation in drift error that is the smallest relative to variation in drift error for other positions of the vibration.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202221
20211
20202
20193
20189