A flock of volleyball-size spherical robots could soon have a very important role on the International Space Station and future space missions: helping astronauts with basic tasks like inspections and data collection.
Known as Synchronized Position Hold, Engage, Reorient, Experimental Satellites, or SPHERES, the robots can work autonomously or be controlled by a human operator. And for the first time this week, ISS astronauts and a crew on Earth collaborated on commanding them by running them through a series of exercises.
Controlling any kind of machine in space from Earth can be tricky because of the time lag — generally one to three seconds — between when a command is sent and acted on. If a robot is working with delicate machinery or humans, it’s very important that it operates in a safe way or it risks causing damage or injury.
According to Lockheed Martin, which collaborated with NASA astronauts from the ground, the researchers ran the three ISS SPHERES through exercises that called for them to follow a lead robot and dock with another piece of machinery. It was shown that one robot could be operated manually while the rest responded autonomously.
The SPHERES’ autonomous maneuvering, which can take it in any direction in microgravity, is made possible by tiny on-board propulsion, power and computer systems. They sense their surroundings via a smartphone, which they also use to take pictures, collect data and send information. Later this year, the satellites’ environmental awareness will go three dimensional when the ISS crew swaps in Google’s Project Tango phones.
“The Project Tango prototype incorporates a particularly important feature for the Smart SPHERES – a 3D sensor,” NASA Ames Research Center Intelligent Robotics Group director Terry Fong said in a NASA release. “This allows the satellites to do a better job of flying around on the space station and understanding where exactly they are.”
As control over SPHERES from Earth improves, they could venture farther than the ISS; say, to Mars or an asteroid.
“We’ve customized cutting-edge commercial technologies to help us answer questions like: How can robots help humans live and work in space? What will happen when humans explore other worlds with robots by their side? Can we make this happen sooner, rather than later?” Fong said in the release. “Building on our experience in controlling robots on the space station, one day we’ll be able to apply what we’ve learned and have humans and robots working together everywhere from Earth’s orbit, to the moon, asteroids and Mars.”