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A Double-Stage Kalman Filter for Orientation Tracking With an Integrated Processor in 9-D IMU

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4 Author(s)
Sabatelli, S. ; Dept. of Inf. Eng., Univ. of Pisa, Pisa, Italy ; Galgani, M. ; Fanucci, L. ; Rocchi, A.

This paper presents an application-specific integrated processor for an angular estimation system that works with 9-D inertial measurement units. The application-specific instruction-set processor (ASIP) was implemented on field-programmable gate array and interfaced with a gyro-plus-accelerometer 6-D sensor and with a magnetic compass. Output data were recorded on a personal computer and also used to perform a live demo. During system modeling and design, it was chosen to represent angular position data with a quaternion and to use an extended Kalman filter as sensor fusion algorithm. For this purpose, a novel two-stage filter was designed: The first stage uses accelerometer data, and the second one uses magnetic compass data for angular position correction. This allows flexibility, less computational requirements, and robustness to magnetic field anomalies. The final goal of this work is to realize an upgraded application-specified integrated circuit that controls the microelectromechanical systems (MEMS) sensor and integrates the ASIP. This will allow the MEMS sensor gyro plus accelerometer and the angular estimation system to be contained in a single package; this system might optionally work with an external magnetic compass.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:62 ,  Issue: 3 )

Date of Publication:

March 2013

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