階層グラフを用いた地形認識型の地上・空中協調マルチモーダル自律探査
A Hierarchical Graph-Based Terrain-Aware Autonomous Navigation Approach for Complementary Multimodal Ground-Aerial Exploration
階層グラフで環境の走行可能性と意味情報を表現し、地上ロボットが信頼度に基づき空中ロボットの展開を判断することで、未知環境の探査効率を高める手法を提案した。
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著者: Akash Patel, Mario A. V. Saucedo, Nikolaos Stathoulopoulos, Viswa Narayanan Sankaranarayanan, Ilias Tevetzidis, Christoforos Kanellakis, George Nikolakopoulos
分類: cs.RO
原文アブストラクト
Autonomous navigation in unknown environments is a fundamental challenge in robotics, particularly in coordinating ground and aerial robots to maximize exploration efficiency. This paper presents a novel approach that utilizes a hierarchical graph to represent the environment, encoding both geometric and semantic traversability. The framework enables the robots to compute a shared confidence metric, which helps the ground robot assess terrain and determine when deploying the aerial robot will extend exploration. The robot's confidence in traversing a path is based on factors such as predicted volumetric gain, path traversability, and collision risk. A hierarchy of graphs is used to maintain an efficient representation of traversability and frontier information through multi-resolution maps. Evaluated in a real subterranean exploration scenario, the approach allows the ground robot to autonomously identify zones that are no longer traversable but suitable for aerial deployment. By leveraging this hierarchical structure, the ground robot can selectively share graph information on confidence-assessed frontier targets from parts of the scene, enabling the aerial robot to navigate beyond obstacles and continue exploration.
