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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20 Apr 2016TL;DR: In this article, mobile connectivity and an innovative approach to sensor data gathering and integration have been employed to automate maintenance inspection, performance monitoring and ride quality measurement in vertical transportation systems, which significantly rationalized and improved the process of maintenance inspection and monitoring.
Abstract: In this project, mobile connectivity and an innovative approach to sensor data gathering and integration have been employed to automate maintenance inspection, performance monitoring and ride quality measurement in vertical transportation systems. An Inertial Navigation System (INS) has been proposed, implemented and tested to track lift car movement profile. The inherent characteristics of vertical motion have been used to minimize errors and obtain higher accuracy in the integration results. The measurement of a correlation between kinematic profiles constructed from lift-car tracking data compared to its nominal values provides key information on the lift condition at any time. A frequency analysis was applied to processing vibrations and noise data, effectively adding another dimension to the lift ride quality measurement. This approach enabled lift performance profiles to be compiled automatically and transmitted in real time, which significantly rationalized and improved the process of maintenance inspection and monitoring. An advanced prototype, AdInspect, has been produced, with the full set of described features. Industry partners are currently evaluating it.
3 citations
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09 Aug 2017TL;DR: Although not yet competitive with state-of-the-art inertial sensors, this novel high-frequency eddy-current displacement sensor performs better than other types of inductive accelerometers and offers the inherent advantages of ECDSs, such as insensitivity to the environment.
Abstract: The eddy-current displacement sensing principle is, to the best of our knowledge, not yet used in inertial sensors. The main reasons for this are the important performance limitations of the existing eddy-current sensor solutions, such as low sensitivity, poor stability, high-power consumption, and bulkiness. Our novel high-frequency eddy-current displacement sensor (ECDS), however, has significantly improved performance with respect to these limitations and allows the use of planar, stable coils, making it a viable candidate for the use in inertial sensors. An implementation example of an ECDS-based inertial sensor with a bandwidth of 370 Hz and a noise floor of $13\,\mu {\text{g}/ \surd \text{Hz}}$ is proposed. Although not yet competitive with state-of-the-art inertial sensors, it performs better than other types of inductive accelerometers and offers the inherent advantages of ECDSs, such as insensitivity to the environment.
3 citations
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21 Jun 2011TL;DR: In this article, a system and method for motion-based adaptive frequency estimation of a Doppler sensor is presented. But the system is not suitable for the measurement of the velocity of an inertial navigation system.
Abstract: A system and method for motion-based adaptive frequency estimation of a Doppler sensor is provided. The system comprises a Doppler sensor configured to output a digitized Doppler data signal, and a Doppler velocity estimation module operatively coupled to the Doppler sensor to receive the Doppler data signal. An inertial navigation system is operatively coupled to the Doppler velocity estimation module, and one or more inertial sensors is operatively coupled to the inertial navigation system. The inertial sensors are configured to transmit inertial navigation data to the inertial navigation system. The Doppler velocity estimation module calculates a speed or velocity estimate based on the Doppler data signal and the inertial navigation data. The speed or velocity estimate is then transmitted to the inertial navigation system.
3 citations
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01 Aug 1973
TL;DR: In this article, the authors present a real-time detection and isolation of hard and soft failures in real time by an airborne computer using skewed alignment of two redundant conventional inertial measuring units.
Abstract: Skewed alignment of two redundant conventional inertial measuring units permits nonambiguous detection and isolation of hard and soft failures in real time by an airborne computer. Accelerometer outputs and gimbal readouts are monitored periodically, and attitude rate and velocity error vectors are computed from these data. Magnitudes of these vectors provide failure detection, and projection of these error vectors onto the coordinate axes of the two clusters permits isolation. A detailed Monte Carlo simulation of one version of the mechanization as applied to Space Shuttle boost trajectories demonstrates effectiveness down to very low levels of inertial instrument performance failures. The results indicate that worst case overall navigation performance occurs when accelerometer failures are of the order of 20 sigma and gyro failures are about 100 sigma for conventional state-of-the-art IMU instruments.
3 citations
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TL;DR: This paper summarizes the development of a MEMS-based flight information system that includes an inertial and air data measurement unit and an electronic compass unit that provides the capability for three-axis accelerations, three- axis angular rates, airspeed, altitude, temperature, and angle of attack measurements.
Abstract: This paper summarizes the development of a MEMS-based flight information system. It includes an inertial and air data measurement unit and an electronic compass unit. The inertial and air data measurement unit provides the capability for three-axis accelerations, three-axis angular rates, airspeed, altitude, temperature, and angle of attack measurements. The compass system is used to measure the magnitude of the external magnetic fields. A Microchip PIC micro-controller is used in each measuring unit to perform data acquisition and deduction andto transfer the results to the host system for further analysis and processing. The inertial and air data measurement unit uses the RS232 serial port to interface with the host system while the compass unit uses the USB bus. The performance of the designed system is evaluated using an in-house designed four-axis motion platform. A specially designed wireless transmission system is also developed and integrated into the test system to improve the efficiency and flexibility of the test system A hardware-software integrated, function tested real system is accomplished in this design.
3 citations