NASA's New Robotic Polar Rover — GROVER — Passes First Polar Field Test

NASA’s new robotic polar rover — GROVER — recently passed its first field test in a polar environment. The rover — commanded solely via satellite communications — successfully navigated the highest, most-extreme point in Greenland, dealing with wind gusts of over 30 mph and temperatures as low as -22 Fahrenheit.

"GROVER in Greenland. GROVER underwent a test of its power consumption at Greenland's highest spot, Summit Camp, on June 2, 2013." Image Credit: NASA Goddard/Matt Radcliff
“GROVER in Greenland. GROVER underwent a test of its power consumption at Greenland’s highest spot, Summit Camp, on June 2, 2013.”
Image Credit: NASA Goddard/Matt Radcliff

GROVER — an acronym for both Greenland Rover and Goddard Remotely Operated Vehicle for Exploration and Research — is the product of a collaboration between teams of students who attended engineering boot camps at the Goddard Space Flight Center during the summers of 2010 and 2011, and researchers at NASA. The rover was designed to house a ground-penetrating radar which would be able to analyze the of layers of snow and ice beneath it.

GROVER had previously been tested by researchers both at a beach in Maryland and in the snow in Idaho, but the recent testing — from May 6 to June 8 at Summit Camp in Greenland — was the first polar testing. “One of the main goals was proving that the robot could execute commands sent from afar over an Iridium satellite connection — an objective GROVER accomplished.”

“When we saw it moving and travelling to the locations our professor had keyed in from Boise, we knew all of our hard work had paid off,” stated Gabriel Trisca, a graduate student from Boise State University. “GROVER has grown to be a fully-autonomous, GPS-guided and satellite-linked platform for scientific research.”

During the testing — which took place over a period of five weeks — GROVER collected radar data on an area of ice spanning over 18 miles. And the rover was able to successfully transmit the data in real time, along with data on how the onboard systems were performing. The robot is solar-powered and can operate for about 12 hours before it needs to recharge its batteries.

“When you work at the poles, on the ice, it’s cold, it’s tiring, it’s expensive and there’s a limit to how much ground you can cover on snowmobiles,” stated Lora Koenig, a glaciologist at NASA’s Goddard Space Flight Center in Greenbelt, Md. “It would be great if autonomous robotic platforms could do part of this work — especially the part where high winds and blowing snow try to freeze your skin.”

While the researchers had originally predicted that “the 800-pound robot to work around the clock and cover more ground, the extreme polar conditions took a toll on GROVER’s electronics, battery consumption and mobility.”

“This is very common the first time you take an instrument into an environment like Greenland,” stated Hans-Peter Marshall, a geoscientist at Boise State University and science adviser on the project. “It’s always more challenging than you thought it was going to be: Batteries don’t recharge as fast and they don’t last as long, and it takes computers and instrumentation longer to boot.”

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Another challenge was the uneven icy terrain. The researchers had to repeatedly tinker with the rover’s speed and the power sent to each of its two autonomous tracks so that the robot would not get stuck in the snow.

GROVER’s radar emits a signal that bounces off the different layers of the ice sheet, allowing scientists to study how snow and ice accumulates in Greenland. The team wanted to check whether the robot could see a layer in the ice sheet that formed after an extreme melt event in the summer of 2012. Marshall said a first analysis of GROVER’s radar data revealed it was sufficient to detect the melt layer and potentially estimate its thickness.

Though currently the radar information is stored onboard and retrieved afterward, the GROVER team wants to switch to a geostationary satellite connection that will let the robot transmit large volumes of data in real time. Other possible changes include replacing components that are hard to manipulate in the cold (like switches and wires), merging the two onboard computers to reduce energy consumption, and using wind generators to create more power or adding a sled carrying additional solar panels.

GROVER’s test in Greenland coincided with the field-testing of a smaller, non-autonomous and faster robot called CoolRobot, built by Dartmouth College. Marshall said that in the future, he would like to see the different science teams that are currently developing polar rovers work together to create a pool of robotic platforms, which glaciologists could borrow from for their studies.

“One thing I can imagine is having a big robot like GROVER with several smaller ones that can move radially outwards to increase the swath GROVER would cover,” Marshall said. “Also, we’ve been thinking about bringing back smaller platforms to a larger one to recharge.”
“An army of polar robots — that would be neat,” Koenig said.

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