Receding horizon estimation and control with structured noise blocking for mobile robot slip compensation
This addresses autonomous navigation challenges for field robots in off-road environments, representing an incremental improvement to existing receding horizon estimation and control methods.
The paper tackles the problem of controlling mobile robots on uncertain terrain by improving slip estimation accuracy, demonstrating through simulation that their structured blocking approach yields better state and parameter estimation compared to methods assuming constant slip.
The control of field robots in varying and uncertain terrain conditions presents a challenge for autonomous navigation. Online estimation of the wheel-terrain slip characteristics is essential for generating the accurate control predictions necessary for tracking trajectories in off-road environments. Receding horizon estimation (RHE) provides a powerful framework for constrained estimation, and when combined with receding horizon control (RHC), yields an adaptive optimisation-based control method. Presently, such methods assume slip to be constant over the estimation horizon, while our proposed structured blocking approach relaxes this assumption, resulting in improved state and parameter estimation. We demonstrate and compare the performance of this method in simulation, and propose an overlapping-block strategy to ameliorate some of the limitations encountered in applying noise-blocking in a receding horizon estimation and control (RHEC) context.