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arXiv 2201.10636cs.RO
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腿式仿人机器人在动态刚性表面上运动的不变滤波

Invariant Filtering for Legged Humanoid Locomotion on Dynamic Rigid Surfaces

University of Massachusetts Lowell(马萨诸塞大学洛厄尔分校);Purdue University(普渡大学);University of Rhode Island(罗德岛大学)

Yuan Gao, Chengzhi Yuan, Yan Gu

摘要:

动态刚性表面(DRS)上的腿运动的状态估计,动态刚性表面是在世界坐标系中移动的刚性表面(例如,船舶、飞机和火车),仍然是一个未被探索的问题。本文介绍了一种不变扩展卡尔曼滤波器,该滤波器通过使用足式机器人的常见传感器(例如,惯性测量单元(IMU)、关节编码器和RDB-D相机)。该滤波器的一个关键特征在于,它明确地解决了非静止的表面-脚接触点和混合机器人的行为。另一个关键特征是,在没有IMU偏差的情况下,滤波器满足吸引群仿射和不变观测条件,因此对于确定性连续相位可证明收敛。可观测性分析揭示DRS运动对状态可观测性的影响,并检查的混合,确定性滤波器系统的可观测状态变量的收敛性。数字人形机器人在俯仰跑步机上行走的实验验证了该滤波器在大估计误差和适度DRS运动下的有效性。实验的视频可以在https://youtu.be/ScQIBFUSKzo上找到。

英文摘要:

State estimation for legged locomotion over a dynamic rigid surface (DRS), which is a rigid surface moving in the world frame (e.g., ships, aircraft, and trains), remains an under-explored problem. This paper introduces an invariant extended Kalman filter that estimates the robot's pose and velocity during DRS locomotion by using common sensors of legged robots (e.g., inertial measurement units (IMU), joint encoders, and RDB-D camera). A key feature of the filter lies in that it explicitly addresses the nonstationary surface-foot contact point and the hybrid robot behaviors. Another key feature is that, in the absence of IMU biases, the filter satisfies the attractive group affine and invariant observation conditions, and is thus provably convergent for the deterministic continuous phases. The observability analysis is performed to reveal the effects of DRS movement on the state observability, and the convergence property of the hybrid, deterministic filter system is examined for the observable state variables. Experiments of a Digit humanoid robot walking on a pitching treadmill validate the effectiveness of the proposed filter under large estimation errors and moderate DRS movement. The video of the experiments can be found at: https://youtu.be/ScQIBFUSKzo.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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