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NASA’s Network of Small Moon-Bound Rovers Is Ready to Roll

By NASA
March 7 in NASA

Preparations for Next Moonwalk Simulations Underway (and Underwater)

Three small rovers that will explore the Moon together — Part of NASA’s CADRE technology demonstration, three small rovers that will explore the Moon together show off their ability to drive as a team autonomously – without explicit commands from engineers – during a test in a clean room at the agency’s Jet Propulsion Laboratory in December 2023.
NASA/JPL-Caltech

Members of the CADRE assembly, test, launch, and operations team pose with completed hardware in a clean room at JPL in late January. Behind the three rovers are the situational awareness camera assembly, one of the deployers that will lower the rovers onto the lunar surface, and the base station.
NASA/JPL-Caltech

Construction and testing are complete on the CADRE rovers, which will map the lunar surface together as a tech demo to show the promise of multirobot missions.

A trio of small rovers that will explore the Moon in sync with one another are rolling toward launch. Engineers at NASA’s Jet Propulsion Laboratory in Southern California recently finished assembling the robots, then subjected them to a punishing series of tests to ensure they’ll survive their jarring rocket ride into space and their travels in the unforgiving lunar environment.

Part of a technology demonstration called CADRE (Cooperative Autonomous Distributed Robotic Exploration), each solar-powered rover is about the size of a carry-on suitcase. The rovers and associated hardware will be installed on a lander headed for the Moon’s Reiner Gamma region. They’ll spend the daylight hours of a lunar day – the equivalent of about 14 days on Earth – conducting experiments by autonomously exploring, mapping, and using ground-penetrating radar that will peer below the Moon’s surface.

The goal is to show that a group of robotic spacecraft can work together to accomplish tasks and record data as a team without explicit commands from mission controllers on Earth. If the project succeeds, future missions could include teams of robots spreading out to take simultaneous, distributed scientific measurements, potentially in support of astronauts.

Engineers have put in long hours test-driving rovers and working out bugs to finish the hardware, get it through testing, and prepare it for integration with the lander.

Clamped to a shaker table, one of NASA’s CADRE rovers gets shaken vigorously during a test in November 2023. This vibration test is designed to show that the rover can withstand the jarring rocket ride on its journey to the Moon aboard a lunar lander.

“We have been in overdrive getting this tech demo ready for its lunar adventure,” said Subha Comandur, CADRE project manager at JPL. “It’s been months of nearly round-the-clock testing and sometimes re-testing, but the team’s hard work is paying off. Now we know these rovers are ready to show what a team of little space robots can accomplish together.”

Shake and Bake

While the list of tests is extensive, the most brutal involve extreme environmental conditions to ensure the rovers can withstand the rigors of the road ahead. That includes being locked in a thermal vacuum chamber that simulates the airless conditions of space and its extreme hot and cold temperatures. The hardware also gets clamped to a special “shaker table” that vibrates intensely to make sure it will endure the journey out of Earth’s atmosphere.

A CADRE rover is prepared for electromagnetic interference and compatibility testing in a special chamber at JPL in November 2023. Such testing confirms that the operation of the electronic subsystems do not interfere with each other nor with those on the lander.

NASA/JPL-Caltech

“This is what we submit our rovers to: ‘shake’ to simulate the rocket launch itself and ‘bake’ to simulate the extreme temperatures of space. It’s very nerve-wracking to witness in person,” said JPL’s Guy Zohar, the project’s flight system manager. “We’re using many carefully selected commercial parts on our project. We expect them to work, but we’re always a little worried when we go into testing. Happily, each test has ultimately been successful.”

Engineers also performed environmental testing on three hardware elements mounted on the lander: a base station that the rovers will communicate with via mesh network radios, a camera that will provide a view of the rovers’ activities, and the deployer systems that will lower the rovers to the lunar surface via a fiber tether fed slowly out from a motorized spool.

Putting Code to the Test, Too

Meanwhile, engineers working on CADRE’s cooperative autonomy software have spent many days in JPL’s rocky, sandy Mars Yard with full-scale versions of the rovers called development models. With flight software and autonomy capabilities aboard, these test rovers showed they can accomplish key goals for the project. They drove together in formation. Faced with unexpected obstacles, they adjusted their plans as a group by sharing updated maps and replanning coordinated paths. And when one rover’s battery charge was low, the whole team paused so they could later continue together.

Two full-scale development model rovers are tested in JPL’s Mars Yard in August 2023 as part of NASA’s CADRE tech demo. These tests confirmed the project’s hardware and software can work together to accomplish key goals.

NASA/JPL-Caltech

The project conducted several drives at night under large flood lamps so the rovers could experience extreme shadows and lighting that approximate what they’ll encounter during the lunar daytime.

After that, the team performed similar drive tests with flight models (the rovers that will go to the Moon) in a JPL clean room. When the spotless floor there proved a bit slippery – a texture different from the lunar surface – the robots got out of formation. But they stopped, adjusted, and proceeded on their planned path.

“Dealing with curveballs – that’s important for the autonomy. The key is the robots respond to things going off plan, then they replan and are still successful,” said JPL’s Jean-Pierre de la Croix, CADRE principal investigator and autonomy lead. “We’re going to a unique environment on the Moon, and there will, of course, be some unknowns. We’ve done our best to prepare for those by testing software and hardware together in various situations.”

Next, the hardware will ship to Intuitive Machines for installation on a Nova-C lander that will launch atop a SpaceX Falcon 9 rocket from NASA’s Kennedy Space Center in Florida.

More About the Project

A division of Caltech in Pasadena, California, JPL manages the CADRE technology demonstration project for the Game Changing Development program within NASA’s Space Technology Mission Directorate in Washington. CADRE is a payload under NASA’s CLPS (Commercial Lunar Payload Services) initiative, which is managed by the agency’s Science Mission Directorate. The agency’s Glenn Research Center in Cleveland and its Ames Research Center in Silicon Valley, California, both supported the project. Motiv Space Systems designed and built key hardware elements at the company’s Pasadena facility. Clemson University in South Carolina contributed research in support of the project.

For more about CADRE, go to:

https://go.nasa.gov/cadre

News Media Contact

Melissa Pamer
Jet Propulsion Laboratory, Pasadena, Calif.
626-314-4928
melissa.pamer@jpl.nasa.gov

2024-022

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Last Updated

Mar 07, 2024

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NASA/Kim Shiflett Teams at NASA’s Kennedy Space Center in Florida practice the Artemis mission emergency escape or egress procedures during a series of integrated system verification and validation tests at Launch Pad 39B on Monday, Aug. 12, 2024. Members of the closeout crew, pad rescue team and the Exploration Ground Systems Program practiced the process of getting inside and out of the emergency egress baskets. While the crew and other personnel will ride the emergency egress baskets to the terminus area in a real emergency, no one rode the baskets for this test. Instead, teams tested the baskets during separate occasions by using water tanks filled to different levels to replicate simulate the weight of passengers.NASA/Frank Michaux Teams at NASA’s Kennedy Space Center in Florida practice the Artemis mission emergency escape or egress procedures during a series of integrated system verification and validation tests at Launch Pad 39B on Monday, Aug. 12, 2024. Members of the closeout crew, pad rescue team and the Exploration Ground Systems Program practiced the process of getting inside and out of the emergency egress baskets. While the crew and other personnel will ride the emergency egress baskets to the terminus area in a real emergency, no one rode the baskets for this test. Instead, teams tested the baskets during separate occasions by using water tanks filled to different levels to replicate simulate the weight of passengers.NASA/Frank Michaux Teams at NASA’s Kennedy Space Center in Florida practice the Artemis mission emergency escape or egress procedures during a series of integrated system verification and validation tests at Launch Pad 39B on Monday, Aug. 12, 2024. Members of the closeout crew, pad rescue team and the Exploration Ground Systems Program practiced the process of getting inside and out of the emergency egress baskets. While the crew and other personnel will ride the emergency egress baskets to the terminus area in a real emergency, no one rode the baskets for this test. Instead, teams tested the baskets during separate occasions by using water tanks filled to different levels to replicate simulate the weight of passengers.NASA/Frank Michaux Teams at NASA’s Kennedy Space Center in Florida practice the Artemis mission emergency escape or egress procedures during a series of integrated system verification and validation tests at Launch Pad 39B on Monday, Aug. 12, 2024. Members of the closeout crew, pad rescue team and the Exploration Ground Systems Program practiced the process of getting inside and out of the emergency egress baskets. While the crew and other personnel will ride the emergency egress baskets to the terminus area in a real emergency, no one rode the baskets for this test. Instead, teams tested the baskets during separate occasions by using water tanks filled to different levels to replicate simulate the weight of passengers.NASA/Frank Michaux Teams at NASA’s Kennedy Space Center in Florida practice the Artemis mission emergency escape or egress procedures during a series of integrated system verification and validation tests at Launch Pad 39B on Sunday, Aug. 11, 2024. Members of the closeout crew, pad rescue team and the Exploration Ground Systems Program practiced the process of getting inside and out of the emergency egress baskets. While the crew and other personnel will ride the emergency egress baskets to the terminus area in a real emergency, no one rode the baskets for this test. Instead, teams tested the baskets during separate occasions by using water tanks filled to different levels to replicate simulate the weight of passengers. NASA/Kim Shiflett When the launch team sent in the red crew during the Artemis I launch countdown to help fix a hydrogen leak, the Pad Rescue team was nearby to help in case anything went wrong. Now as teams train for Artemis II – the first crewed Artemis mission – they’re learning all the new additions at Launch Complex 39B that come with having astronauts onboard.
  This includes learning the Artemis emergency egress system. Before Artemis II launches, the Pad Rescue team – along with other teams like the Exploration Ground Systems (EGS) Program responsible for launching the Artemis missions, and the closeout crew who are responsible for helping the astronauts get inside the Orion spacecraft – will thoroughly train for all kinds of emergency procedures that can occur during the launch countdown.
  The most recent training ahead of Artemis II included practicing several emergency egress situations such as helping aid the closeout and the simulated flight crew off of the launch tower after a simulated hydrogen leak occurred during a launch countdown.
  “It’s a sense of pride for all of us that are on this team. They step up and they volunteer to be a part of this. Working with EGS, the Commercial Crew Program, and other commercial space companies makes me feel really involved with the space program. This is a one-of-a-kind rescue team.”
  CHRISTOPHER YOUNG
  NASA Kennedy Fire Protection Chief and Pad Rescue Program Operational Lead
  Artemis II will send four astronauts – commander Reid Wiseman, pilot Victor Glover and mission specialists Christina Koch and Jeremy Hansen from the Canadian Space Agency – around the Moon on NASA’s path to establishing a long-term presence at the lunar surface for science and exploration through Artemis. The 10-day flight will test NASA’s foundational human deep space exploration capabilities, the SLS (Space Launch System) rocket, Orion spacecraft, for the first time with astronauts.
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