Abstract
Online approximation of an infinite horizon optimal path-following strategy for a kinematic unicycle is considered. The solution to the optimal control problem is approximated using an approximate dynamic programming technique that uses concurrent-learning-based adaptive update laws to estimate the unknown value function. The developed controller overcomes challenges with the approximation of the infinite horizon value function using an auxiliary function that describes the motion of a virtual target on the desired path. The developed controller guarantees uniformly ultimately bounded (UUB) convergence of the vehicle to a desired path while maintaining a desired speed profile and UUB convergence of the approximate policy to the optimal policy. Simulation results are included to demonstrate the controller's performance.
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