Accurate IMU Factor Using Switched Linear Systems For VIO

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Accurate IMU Factor Using Switched Linear Systems For VIO
Accurate IMU Factor Using Switched Linear Systems For VIO
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IEEE Trans. on Industrial Electronics
Publication Date:
15 June 2020
Accurate motion estimation plays a crucial role in state estimation of an unmanned aerial vehicle (UAV). This is usually carried out by fusing the kinematics of an inertial measurement unit (IMU) with the video output of a camera. However, the accuracy of existing approaches is hindered by the discretization effect of the model even at a high IMU sampling rate. In order to improve the accuracy, we propose a new IMU motion integration model for the IMU kinematics in continuous time. The kinematics are modelled using a switched linear system. A closed form discrete formulation is derived to compute the mean measurement, the covariance matrix and the Jacobian matrix. Thus, it is more accurate and more efficient for online estimation of visual inertial odometry (VIO), particularly when there is a high dynamic change in the agent’s motion or the agent travels with high speed. The proposed IMU factor framework is evaluated using both real public datasets and indoor environment under different scenarios of motion capture. Our evaluation shows that the proposed framework outperforms the state-ofthe- art VIO approach by up to 22.71% accuracy improvement on the EuRoc dataset and 38.15% accuracy improvement for motion estimation under the indoor environment.
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Funding Info:
This work was supported in part by the National Robotics Programme (NRP) under SERC Grants 162 25 00036 and 192 25 00049.

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