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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
26 Apr 2004
TL;DR: Align In Motion as mentioned in this paper allows initialization of a Strapdown inertial navigation system while an aircraft is moving, in the air or on the ground, using a GPS and an inertial reasonableness test.
Abstract: Strapdown inertial navigation systems require an initialization process that establishes the relationship between the aircraft body frame and the local geographic reference. This process, called alignment, generally requires the device to remain stationary for some period of time in order to establish this initial state. This paper describes an alignment process where the initialization occurs while the device is moving. This is possible because an accurate determination of the aircraft motion is available based on measurements obtained from GPS. Align In Motion allows initialization of a Strapdown Inertial Navigation System while an aircraft is moving, in the air or on the ground. This is accomplished using Civilian grade GPS and an inertial reasonableness test, thereby allowing commercial data integrity requirements to be met. Align In Motion has been FAA certified to recover pure INS performance equivalent to stationary align procedures for civilian flight times up to 18 hours. This Align In Motion capability allows the removal of dedicated backup batteries on aircraft resulting in weight, cost, and reliability improvements. Align In Motion also has benefits for aircraft operations on the ground, on board ship, and in the air such as reduced turn backs, quicker dispatch, and world-wide alignment including polar regions. This paper will describe an avionics architecture using Align In Motion. It will cover INS warm start and cold start following a power interrupt with recovery to full inertial navigation capability without pilot interaction. Successful flight test results will also be presented.

11 citations

Patent
13 May 2009
TL;DR: In this paper, an inertial sensing system with a proof mass providing a deflection signal in response to application of inertial force, where the proof mass has a physical deflection limit and a selected saturation limit set below the deflection constraint, is considered.
Abstract: An inertial sensing system including an inertial sensor having a proof mass providing a deflection signal in response to application of an inertial force, wherein the proof mass has a physical deflection limit and a selected saturation limit set below the deflection limit, elements for providing a closed-loop output in response to the deflection signal from the inertial sensor, wherein the closed-loop output is proportional to the inertial force until the saturation limit of the inertial sensor is reached, elements for providing an open-loop output in response to the deflection signal from the inertial sensor once the saturation limit is reached, and elements for summing the closed-loop output with the open-loop output when the saturation limit of the inertial sensor is reached, to provide a high-range output response for the system.

11 citations

Patent
07 Nov 2013
TL;DR: In this article, a new method for the estimation of ego-motion (the direction and amplitude of the velocity) of a mobile device comprising optic-flow and inertial sensors (hereinafter the apparatus) is presented.
Abstract: A new method for the estimation of ego-motion (the direction and amplitude of the velocity) of a mobile device comprising optic-flow and inertial sensors (hereinafter the apparatus). The velocity is expressed in the apparatus's reference frame, which is moving with the apparatus. The method relies on short-term inertial navigation and the direction of the translational optic-flow in order to estimate ego-motion, defined as the velocity estimate (that describes the speed amplitude and the direction of motion). A key characteristic of the invention is the use of optic-flow without the need for any kind of feature tracking. Moreover, the algorithm uses the direction of the optic-flow and does not need the norm, thanks to the fact that the scale of the velocity is solved by the use of inertial navigation and changes in direction of the apparatus.

11 citations

Journal Article
TL;DR: The roadmap of inertial technology as well as the application of current inertIAL technology at home and abroad is reviewed and the gap between the level in China and the international leading level of inertials technology is analyzed.

11 citations

Patent
08 Jun 1960

11 citations


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