Grocholsky, Ben
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Publication Experiments in Multirobot Air-Ground Coordination(2004-04-26) Chaimowicz, Luiz; Grocholsky, Ben; Keller, James F; Kumar, R. Vijay; Taylor, Camillo JThis paper addresses the problem of coordinating aerial and ground vehicles in tasks that involve exploration, identification of targets and maintaining a connected communication network. We focus on the problem of localizing vehicles in urban environments where GPS signals are often unreliable or unavailable. We first describe our multi-robot tesbed and control software used to coordinate ground and aerial vehicles. We present the results of experiments in air-ground localization analyzing three complementary approaches to determining the positions of vehicles on the ground. We show that the coordination of aerial vehicles with ground vehicles is necessary to get accurate estimates of the state of the system.Publication Formations of Localization of Robot Networks(2004-04-26) Zhang, Fan; Grocholsky, Ben; Kumar, R. VijayIn this paper, we consider the problem of cooperatively localizing a formation of networked mobile robots/vehicles in SE(2), and adapting the formation to reduce localization errors. First, we propose necessary and sufficient conditions to establish when a team of robots with heterogeneous sensors can be completely localized. We present experimental measurements of range and bearing with omni-directional cameras to motivate a simple model for noisy sensory information. We propose a measure of quality of team localization, and show how this measure directly depends on a sensing graph. Finally, we show how the formation and the sensing graph can be adapted to improve the measure of performance for team localization and for localization of targets through experiments and simulations.