可動域制約を利用した磁気センサ不要の関節姿勢トラッキング
Magnetometer-free inertial motion tracking of arbitrary joints with range of motion constraints
回転関節でつながれた物体の可動域制約を利用し、磁力計なしでIMUのみから長期的に安定した相対姿勢を推定する非線形ウィンドウベース手法を提案し、機械関節で実験的に検証した。
著者: Dustin Lehmann, Daniel Laidig, Raphael Deimel, Thomas Seel
分類: eess.SY, cs.RO, cs.SY
原文アブストラクト
In motion tracking of connected multi-body systems Inertial Measurement Units (IMUs) are used in a wide variety of applications, since they provide a low-cost easy-to-use method for orientation estimation. However, in indoor environments or near ferromagnetic material the magnetic field is inhomogeneous which limits the accuracy of tracking algorithms using magnetometers. Methods that use only accelerometers and gyroscopes on the other hand yield no information on the absolute heading of the tracked object. For objects connected by rotational joints with range of motion constraints we propose a method that provides a magnetometer-free, long-term stable relative orientation estimate based on a non-linear, window-based cost function. The method can be used for real-time estimation as well as post-processing. It is validated experimentally with a mechanical joint and compared to other methods that are used in motion tracking. It is shown that for the used test object, the proposed methods yields the best results with a total angle error of less than 4 degrees for all experiments.
