Adaptive Sampling for Multi-Robot Wide Area Prospecting

Kian Hsiang Low, Geoffrey Gordon, John M. Dolan, and Pradeep Khosla
tech. report CMU-RI-TR-05-51, Robotics Institute, Carnegie Mellon University, October, 2005


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Abstract
Prospecting for in situ mineral resources is essential for establishing settlements on the Moon and Mars. To reduce human effort and risk, it is desirable to build robotic systems to perform this prospecting. An important issue in designing such systems is the sampling strategy: how do the robots choose where to prospect next? This paper argues that a strategy called Adaptive Cluster Sampling (ACS) has a number of desirable properties: compared to conventional strategies, (1) it reduces the total mission time and energy consumption of a team of robots, and (2) returns a higher mineral yield and more information about the prospected region by directing exploration towards areas of high mineral density, thus providing detailed maps of the boundaries of such areas. Due to the adaptive nature of the sampling scheme, it is not immediately obvious how the resulting sampled data can be used to provide an unbiased, low-variance estimate of the regional mineral density. This paper therefore investigates new mineral density estimators, which have lower error than previously-developed estimators; they are derived from the older estimators via a process called Rao-Blackwellization. Since the efficiency of estimators depends on the type of mineralogical population sampled, the population characteristics that favor ACS estimators are also analyzed. The ACS scheme and our new estimators are evaluated empirically in a detailed simulation of the prospecting task, and the quantitative results show that our approach can yield more minerals with less resources and provide more accurate mineral density estimates than previous methods.

Notes
Associated Lab(s) / Group(s): Tele-Supervised Autonomous Robotics
Associated Project(s): Wide Area Prospecting Using Supervised Autonomous Robots
Number of pages: 27

Text Reference
Kian Hsiang Low, Geoffrey Gordon, John M. Dolan, and Pradeep Khosla, "Adaptive Sampling for Multi-Robot Wide Area Prospecting," tech. report CMU-RI-TR-05-51, Robotics Institute, Carnegie Mellon University, October, 2005

BibTeX Reference
@techreport{Low_2005_5170,
   author = "Kian Hsiang Low and Geoffrey Gordon and John M Dolan and Pradeep Khosla",
   title = "Adaptive Sampling for Multi-Robot Wide Area Prospecting",
   booktitle = "",
   institution = "Robotics Institute",
   month = "October",
   year = "2005",
   number= "CMU-RI-TR-05-51",
   address= "Pittsburgh, PA",
}