Optimization-Based System Identification and Moving Horizon Estimation Using Low-Cost Sensors for a Miniature Car-Like Robot

Abstract

This paper presents an open-source miniature carlike robot with low-cost sensing and a pipeline for optimizationbased system identification, state estimation, and control. The overall robotics platform comes at a cost of less than ${\$}$ 700 and thus significantly simplifies the verification of advanced algorithms in a realistic setting. We present a modified bicycle model with Pacejka tire forces to model the dynamics of the considered all-wheel drive vehicle and to prevent singularities of the model at low velocities. Furthermore, we provide an optimization-based system identification approach and a moving horizon estimation (MHE) scheme. In extensive hardware experiments, we show that the presented system identification approach results in a model with high prediction accuracy, while the MHE results in accurate state estimates. Finally, the overall closed-loop system is shown to perform well even in the presence of sensor failure for limited time intervals. All hardware, firmware, and control and estimation software is released under a BSD 2-clause license to promote widespread adoption and collaboration within the community.Code: https://gitlab.ethz.ch/ics/crsDataset: https://gitlab.ethz.ch/ics/crs/-/tree/ main/datasetsVideo: https://youtu.be/vKF30Sol8Qk