Complex Terrain Navigation via Model Error Prediction
This addresses navigation challenges for robots in unstructured outdoor environments, representing an incremental improvement over traditional geometric methods.
The paper tackles robot navigation in deformable, complex terrain by learning to predict traversability based on model error, enabling successful navigation with as little as 50 minutes of training data across simulation and real-world environments.
Robot navigation traditionally relies on building an explicit map that is used to plan collision-free trajectories to a desired target. In deformable, complex terrain, using geometric-based approaches can fail to find a path due to mischaracterizing deformable objects as rigid and impassable. Instead, we learn to predict an estimate of traversability of terrain regions and to prefer regions that are easier to navigate (e.g., short grass over small shrubs). Rather than predicting collisions, we instead regress on realized error compared to a canonical dynamics model. We train with an on-policy approach, resulting in successful navigation policies using as little as 50 minutes of training data split across simulation and real world. Our learning-based navigation system is a sample efficient short-term planner that we demonstrate on a Clearpath Husky navigating through a variety of terrain including grassland and forest