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Contact: Anne Watzman or Teresa Thomas
(412) 268-3830 or 3580

For immediate release:
August 16, 2001

Carnegie Mellon's Solar Powered Robot Demonstrates Concept That Could Lead to Long-Term Exploration of Planets and Moons

PITTSBURGH–A prototype, solar­powered robot, developed with support from NASA by researchers at Carnegie Mellon University's Robotics Institute, has demonstrated a concept that could pave the way for future long­term robotic exploration of distant planets and moons.

In late July, the robot named Hyperion successfully completed field experiments on Devon Island in the Canadian Arctic. It tested the concept of Sun­Synchronous Navigation, a technique that involves tracking the sun while exploring terrain. Hyperion performed navigation experiments during the period of 24­hour sunlight that occurs in the summer, exploring the terrain it encountered while simultaneously monitoring its solar power input to ensure that it chose paths that enabled it to collect enough energy to complete each segment of its planned traverse.

During the initial experiment on July 18­19, Hyperion traveled 6.1 kilometers, circumnavigating the Von Braun Planitia, an area near Devon Island's Haughton Crater. The crater and its surroundings are the subject of ongoing study by NASA because of apparent similarity to features on Mars.

According to Sun­ Synchronous Navigation project manager David Wettergreen, a Robotics Institute research scientist, about 95 percent of the circuit was completed autonomously, with the remainder under remote supervision. The experiment began and ended with the robot's batteries fully charged and ready to continue operation.

As it encountered the unknown terrain, Hyperion sometimes fell behind its timetable for operation, but each time it caught up when it emerged into a more easily navigable region.

"The ability of the robot's perception and navigation system to find routes was very impressive," said Wettergreen. "Analysis of telemetry recorded from Hyperion will reveal the thousands of obstacles it detected and evaluated, the tens of thousands of steering corrections and the statistics of planned versus actual distance and power. Qualitatively, Hyperion wiggled through some pretty tight spots."

In the extended experiment, which took place July 21­22, Hyperion covered 9.1 kilometers, traveled through rougher terrain, including scree slopes and mud flats, and was challenged with a mission plan that at times put desired goal locations in conflict with the position of the sun.

Wettergreen said that the extended experiment intentionally pushed the limits of Hyperion's capability in order to find where further research is necessary. In this experiment, Hyperion had greater difficulty due to communication drop­outs, areas of extremely rugged terrain, and dazzling of its stereo cameras by the sun. In the end, however, it arrived at its destination on schedule with charged batteries.

In only one instance was manual intervention required to correct a steering problem.

"There is more work to do to move new technologies from research into development, but the fundamental ideas have been proven," Wettergreen said. Wettergreen and six colleagues, including graduate students and Robotics Institute engineers, left for Devon Island on July 3. They began to work with Hyperion, building up toward the main experiments that were scheduled for July 10. But the time they had was decreased by bad weather and more snow than they had expected during this time of year. They had a narrow window of time to complete their work—after the snow has melted in mid­July and when the sun begins to drop below the hills toward the end of the month. "The technology is a grand leap for planetary exploration," said William "Red" Whittaker, the Fredkin research professor in the Robotics Institute and principal investigator of the Hyperion project.

Wettergreen emphasized that Hyperion is a concept vehicle designed to operate only on earth. The objective is to develop technologies, like reasoning about terrain, sunlight and power, that are broadly applicable to robotic explorers but specifically tailored to robots that could operate at the poles of the moon or in the polar regions of Mars.

For more detailed information about Hyperion, and the sun­synchronous navigation experiments successfully performed in the Canadian Arctic, see

For more information on the NASA Haughton­Mars project, see http://www.arctic­


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