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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01 Jun 2015TL;DR: In this article, a calibration for the inertial measurement unit (IMU) is carried out to enhance the navigation precision of a strap-down inertial navigation system, which is necessary to carry out a high accuracy calibration of the IMU.
Abstract: To enhance the navigation precision of strapdown inertial navigation system, it is necessary to carry out a high accuracy calibration for the inertial measurement unit (IMU). In this paper, a novel...
6 citations
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TL;DR: This work develops a special six degrees of freedom IMU, which has the capability of measuring the angular accelerations, and introduces two experimental methods to verify the calibrated IMU readings.
Abstract: Dynamics modeling is becoming more and more important in the development and control of unmanned aerial vehicles (UAV). An accurate model of a vehicle requires good knowledge of the dynamics properties and motion states, which are usually estimated with the help of integrated inertial measurement units (IMUs). This work develops a special six degrees of freedom IMU, which has the capability of measuring the angular accelerations. This paper introduces the design of the new IMU along with its sensor models and calibration procedures. The work introduces two experimental methods to verify the calibrated IMU readings. The IMU was designed to support an on-line methodology to estimate the parameters of UAV’s dynamics model that is currently being developed by the authors. [DOI: 10.1115/1.4007122]
6 citations
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TL;DR: Inertial navigation systems represent the ideal in automatic navigation and operate entirely without external assistance, other than information as to their starting conditions, which makes them of great interest to both military and civil operators.
Abstract: Inertial navigation systems represent the ideal in automatic navigation. They operate entirely without external assistance, other than information as to their starting conditions, which makes them of great interest to both military and civil operators.
6 citations
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TL;DR: Theoretical analysis and simulation of the proposed rotation INS RINS demonstrated that RINS could attenuate positioning errors caused by random constant and time-related components of sensor errors, whereas it did not perform better in modulating white noise component.
Abstract: This research developed a new inertial navigation system INS with two inertial measurement units IMU rotating bi-directionally around the vertical and longitudinal body axis respectively. Theoretical analysis and simulation of the proposed rotation INS RINS were presented, which demonstrated that RINS could attenuate positioning errors caused by random constant and time-related components of sensor errors, whereas it did not perform better in modulating white noise component. It also showed that in RINS, utilising inertial sensors with longer relation time and increasing rotation rate are more beneficial. In addition, bi-directional rotation could acquire better result than that unidirectional rotation. Moreover, an experimental RINS prototype with gyroscope drifts of 0.05°/h and accelerometer biases of 50 ug was built. The vehicle tests showed that RINS can achieve positioning accuracy of less than 3 n miles during 8 h 0.3 n mile/h, CEP, more than 10 times improvement than strapdown INS with the same inertial sensors.
6 citations
01 Mar 2001
TL;DR: In 1995, the NASA Langley Research Center conducted a series of experimental measurements that characterized the electromagnetic environment inside a Boeing 757 airliner while in flight, measurements were made of the electromagnetic energy coupled into a commercially configured aircraft as it was flown in close proximity to ground-based radio frequency (RF) transmitters operating at approximately 26, 173. and 430 MHz as mentioned in this paper.
Abstract: In 1995, the NASA Langley Research Center conducted a series of experimental measurements that characterized the electromagnetic environment (EME) inside a Boeing 757 airliner while in flight, Measurements were made of the electromagnetic energy coupled into a commercially configured aircraft as it was flown in close proximity to ground-based radio frequency (RF) transmitters operating at approximately 26, 173. and 430 MHz. The goal of this experiment was to collect data for the verification of analytical predictions of the internal aircraft response to an external stimulus. This paper describes the experiment, presents the data collected by it, and discusses techniques used to compute both the magnitude of the electric field illuminating the aircraft and its direction of propagation relative to a coordinate system fixed to the aircraft. The latter is determined from Global Positioning System (GPS) and aircraft Inertial Reference Unit (IRU) data. The paper concludes with an examination of the shielding effectiveness of the test aircraft. as determined by comparison of' the measured internal EME and computed external EME.
6 citations