Sim-to-Real Reinforcement Learning for Path-Safe Target Reaching in Robotic Harvesting of Hydroponic Lettuce
This study introduces PSA-PPO, a target-conditioned local reaching framework for robotic harvesting of hydroponic lettuce. Trained entirely in simulation, PSA-PPO achieves 94.7% reaching rate in physical testing, outperforming classical planners. The method integrates safety constraints and trajectory-based encoding to improve performance in constrained environments.