Topic
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.
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17 Sep 2012
TL;DR: In this article, a method for correcting errors for an Inertial Navigation System is proposed, which includes the steps of determining a working state of the inertial navigation system based on a current positioning parameter of the moving object, a navigation map-based reference positioning parameter and a GPS-based positioning parameter.
Abstract: A method for correcting errors for an Inertial Navigation System. The method includes the steps of determining a working state of the Inertial Navigation System based on a current positioning parameter of the moving object, a navigation map-based reference positioning parameter and a GPS-based reference positioning parameter, and replacing an initial parameter of the Inertial Navigation System with the GPS-based reference positioning parameter and resetting the Inertial Navigation System to an initial state if the Inertial Navigation System is determined to be in an abnormal working state.
7 citations
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24 Nov 2014TL;DR: In this article, an invariant Kalman filter is used to estimate a mobile carrier state (P) in a work reference frame (Rt) translated with respect to an inertial reference frame and for which the origin moves along a reference inertial trajectory, the carrier of which is assumed to be close.
Abstract: The invention relates to an alignment method based on a simplified mode allowing processing using an invariant Kalman filter, in which each speed involved in the navigation equations is expressed in a work reference frame (Rt) translated with respect to an inertial reference frame (Ri) and for which the origin moves along a reference inertial trajectory, the carrier of which is assumed to be close (geographic origin for alignment with the sun at known position, GPS trajectory for alignment in-motion, etc.). This simplified mode comprises the repetition of the following steps to estimate a mobile carrier state (P): - propagation (PROP) determining an estimated current state from a preceding estimated state, inertial sensor measurements and theoretical information on the carrier trajectory (P) - updating (MAJ) the estimated state using theoretical information on the carrier trajectory (P). The deterministic uncertainties of the sensors (bias/drift/scale factors, etc.) are only estimated during the propagation and update steps. A perturbation step (PERT) then allows inclusion of the values ignored in the simplified mode and estimation of these values by an optimisation method.
7 citations
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16 Oct 2017
7 citations
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TL;DR: It is found that the gyro timeasynchrony error can be considered as a kind of pseudo-coning motion error caused by data processing and the single-axis tumble test method is introduced for the testing of each accelerometer time- asynchrony with respect to the ideal gyro triad.
7 citations
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12 Jul 2005TL;DR: In this paper, the mass measurement system includes a linear acceleration motion unit that is a linear motion driving source, a first load cell fastened to the LAMU to measure an inertial force of a sample caused by linearly accelerated motion of the 10 linear acceleration unit, and a second load cell, while being spaced apart from the first cell by a predetermined distance.
Abstract: The mass measurement system includes a linear acceleration motion unit that is a linear motion driving source, a first load cell fastened to the linear acceleration motion unit to measure an inertial force of a sample caused by linearly accelerated motion of the 10 linear acceleration motion unit, a second load cell fastened to the linear acceleration motion unit while being spaced apart from the first load cell by a predetermined distance, the second load cell measuring an inertial force of a standard sample having a known standard mass caused by the linearly accelerated motion of the linear acceleration motion unit, and a main control unit for calculating and outputting mass of the sample through an arithmetic operation based on the inertial forces, measured by the first and second load cells, and the standard mass, and controlling an entire operation of the system.
7 citations