NASA and CSA robotic operations advance satellite servicing

Mar 14, 2012 By Michael Curie and Dewayne Washington
The Robotic Refueling Mission (RRM) module on the International Space Station before it was installed on its permanent platform. RRM will demonstrate robotic servicing technology and lay the foundation for future missions. Credit: NASA

NASA's Robotic Refueling Mission (RRM) experiment aboard the International Space Station has demonstrated remotely controlled robots and specialized tools can perform precise satellite-servicing tasks in space. The project marks a milestone in the use of the space station as a technology test bed.

"We and our partners are making important technological breakthroughs," Charles Bolden said. "As we move ahead toward reaching our exploration goals, we will realize even more benefits from humans and robots working together in ."

The Canadian Space Agency's (CSA) robotic handyman, Dextre, successfully completed the tasks March 7-9 on the space station's external RRM module, designed to demonstrate the tools, technologies and techniques needed to robotically refuel and repair satellites.

"The Hubble servicing missions taught us the importance and value of getting innovative, cutting-edge technologies to orbit quickly to deliver great results," said Frank Cepollina, a veteran leader of five Hubble Space Telescope servicing missions and associate director of the Satellite Servicing Capabilities Office (SSCO) at NASA's Goddard Space Flight Center in Greenbelt, Md. "The impact of the space station as a useful technology cannot be overstated. Fresh satellite-servicing technologies will be demonstrated in a real space environment within months instead of years. This is huge. It represents real progress in space technology advancement."

Before a satellite leaves the ground, technicians fill its fuel tank through a valve that is sealed, covered and designed never to be accessed again. The RRM experiment demonstrates a remote-controlled robot can remove these barriers and refuel such satellites in space.

On July 12, 2011, spacewalking astronauts Mike Fossum and Ron Garan successfully transferred the Robotic Refueling Mission module from the Atlantis shuttle cargo bay to a temporary platform on the International Space Station's Dextre robot. Credit: NASA

Dextre successfully retrieved and inspected RRM tools, released safety launch locks on tool adapters, and used an RRM tool to cut extremely thin satellite lock wire. These operations represent the first use of RRM tools in orbit and Dextre's first participation in a research and development project.

RRM was developed by SSCO and is a joint effort between and CSA. During the next two years, RRM and Dextre will conduct several servicing tasks using RRM tools on satellite parts and interfaces inside and covering the cube-shaped RRM module.

NASA expects the RRM results to reduce the risks associated with satellite servicing. It will encourage future robotic servicing missions by laying the foundation for them. Such future missions could include the repair, refueling and repositioning of orbiting satellites.

"We are especially grateful to CSA for their collaboration on this venture," Cepollina said. "CSA has played a pivotal role in the development of space robotics, from the early days of the space shuttle to the work they are doing with Dextre on space station."

During the three-day RRM Gas Fittings Removal task, the 12-foot (3.7-meter) Dextre performed the most intricate task ever attempted by a space robot: cutting two separate "lock wires" 20 thousandths of an inch (0.5 millimeters) in diameter using the RRM Wire Cutter Tool (WCT). Deftly maneuvered by ground-based mission operators and Dextre, the WCT smoothly slid its hook under the individual wires and severed them with only a few millimeters of clearance. This wire-cutting activity is a prerequisite to removing and servicing various parts during any future in-orbit missions.

RRM operations are scheduled to resume in May 2012 with the completion of the gas fittings removal task. The RRM Refueling task is scheduled for later this summer. NASA and CSA will present RRM results at the Second International Workshop on on-Orbit Servicing, hosted by Goddard May 30-31, 2012.

Dextre and RRM are an example of how robots are changing operations in space. Another is Robonaut 2, or R2, a project of NASA and General Motors. R2, the first human-like , was launched into space in 2011 and is a permanent resident of the .

Explore further: Planetary Society hopes tiny satellite sets sail above Earth

More information: For more information about RRM or the On-Orbit Servicing Workshop, visit: ssco.gsfc.nasa.gov

add to favorites email to friend print save as pdf

Related Stories

Robotic refueling mission begins with space station robotics

Mar 07, 2012

NASA's highly anticipated Robotic Refueling Mission (RRM) began operations on the International Space Station with the Canadian Dextre robot and RRM tools March 7-9, 2012, marking important milestones in satellite-servicing ...

NASA Sends Dextre to Fix the Hubble

Aug 11, 2004

NASA has decided to try to save the orbiting Hubble Space Telescope by sending a Canadian-made robot Dextre to fix it, agency officials say. Dextre - formally the Special Purpose Dextrous Manipulator - is a ...

Image: Dextre gets to work

Feb 10, 2011

Dextre, the Canadian Space Agency's robotic "handyman", is featured in this image photographed by an Expedition 26 crew member aboard the International Space Station on Feb. 3, 2011.

Recommended for you

Tidal forces gave moon its shape, according to new analysis

6 hours ago

The shape of the moon deviates from a simple sphere in ways that scientists have struggled to explain. A new study by researchers at UC Santa Cruz shows that most of the moon's overall shape can be explained by taking into ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

Kimben
5 / 5 (1) Mar 14, 2012
This is good, now we can use robots to do repairs, not only on the ISS, but, i believe we will biuld robotic repairmen, to repair satalites and even the Hubble Space Telascope. One can only hope so anyway. I do hope the stupid polititions in Washington D.C. don't get the idea to replace all human's in space with them. Oh, and we could biuld robotic garbage scows with robot trash collectors to gather in all the space junk, hey, it's a thought. :)