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.

Fault-Tolerant GPS/DR Integrated Navigation System Based on Heuristic Reduction of MEMS Inertial Measurement Unit Drift

Abstract: An efficient, adaptive Kalman filter is presented based on heuristic reduction of MEMS inertial measurement unit drift, which can detect the failure of GPS, and reduce the drift of MEMS inertial measurement unit. The method applies in GPS/DR integrated navigation system, which pertains to the reduction of measurement errors in gyroscopes and accelerations used for tracking the position of vehicle when the GPS is unavailable.

Influence of precision inertial systems on astronomical observations

Abstract: The incorporation of precision inertial control on LST could exert a strong influence on the philosophy of and techniques for carrying out astronomical observations. In conjunction with a fine guidance star sensor, the inertial reference unit (IRU) described herein could easily expand LST capability to include observations such as (1) tracking of solar system objects, including specific points of interest on the planets; (2) rapid repositioning of scanning sensors on distributed objects such as nebulae and galaxies; (3) carrying out unified star catalog measurements to eliminate the overlap problem which exists in all ground procedures; and (4) carrying out various astrometric measurements with 'real time' data reduction capability.

A method and system of determining an inertial sensor orientation offset

Abstract: Inertial sensors are typically mounted at an angular offset relative to a chassis, such as a vehicle chassis or electronic device chassis. This offset can influence the measurements of the angular orientation of said chassis derived from inertial sensors. There is provided a method of determining a sensor orientation offset relative to a chassis by obtaining a first inertial sensor measurement, rotating the chassis approximately 180°, obtaining a second inertial sensor measurement; and then determining the offset from the two inertial sensor measurements.

Inertial sensor data correction

Abstract: A method is provided for determining corrections to rate data output by inertial sensors of a type typically used in tracking changes in orientation of anobject. The invention also extends to a tracker system incorporating the correction functionality of the method. The method makes use of rate data output by inertial sensors associated with the object being tracked and rate data derived from measures of orientation supplied by a non-inertial tracker system also associated with the object being tracked and comprises determining from those rate data corrections for errors due to misalignment in rate data output by inertial sensors, by calculating a mapping between vectors linking points in inertial sensor rate space represented by a sample set of received rate data from the inertial sensors and vectors linking points in a derived object orientation rate space represented by a corresponding and synchronised sample set of derived rate data. Corrections for inertial sensor bias may be determined separately from corrections for misalignment-related errors, after correction of inertial sensor rate data for misalignment-related errors by determining the vector translation between a point represented by corrected inertial sensor rate data in the derived object orientation rate space and the point in the same rate space represented by derived rate data synchronised therewith. The invention is applicable to a pilot helmet tracker system as indicated in figure 4.