It will be "one of the most powerful space-qualified computers ever made and flown", stated Alan George, department chair of the Swanson School of Engineerings Department of Electrical and Computer Engineering, who led Pitt researchers and graduate students on the project.
On the space station, the computer will serve as a research "sandbox" for space-based experiments on computing, sensing, image processing and machine learning. Researchers said the main objective of these experiments is progression toward autonomous spacecraft, like a more advanced version of the self-driving cars seen in Pittsburgh.
This radiation-tolerant computer cluster, called the "Spacecraft Supercomputing for Image and Video Processing (SSIVP) system", is part of the U.S. Department of Defense Space Test Program-Houston 6 mission (STP-H6), developed at the National Science Foundation Center for Space, High-performance, and Resilient Computing (SHREC).
The system "features an unprecedented combination of high performance, high reliability, low power and reconfigurability for computing in the harsh environment of space, going beyond the capabilities of previous space computers", stated Alan George, who's also founder and director of SHREC.
The project carries over from time's spent with the University of Florida prior to moving to Pitt in 2017, when a pair of space computers developed by Pitt students and faculty was sent aboard the space station.
Last year, the new space supercomputer embarked on a 1400-mile land-based journey for rigorous testing, from NASA Goddard Space Flight Center in Greenbelt, Maryland, to the NASA Johnson Space Flight Center in Houston to the NASA Langley Research Center in Hampton, Virginia. Its final, much shorter and more meaningful trip will see it travel 250 miles skyward from NASA Kennedy Space Center in Cape Canaveral, Florida, to the space station with the SpaceX-17 mission on a Falcon 9 SpaceX rocket.
The new space computer is more than 2.5 times more powerful than its predecessor, which was launched to the space station with STP-H5 on SpaceX-10 in February 2017. It includes dual high-resolution cameras capable of snapping 5-megapixel images of Earth, for detailed aerial shots like the city of Pittsburgh, all in a system about the size of a breadbox.
The H5 system will remain on the space station, working separately from the soon-to-be-launched H6 system on a dynamic set of space technology experiments until at least 2021. The H6 system is expected to be in service for three to four years after launch.
The large amounts of data the new system captures will pose their own challenge.
"There are limitations in communications between ground and spacecraft, so we're trying to circumvent these limitations with high-performance onboard data processing to more quickly transfer data", stated Sebastian Sabogal, a third-year PhD student studying electrical and computer engineering. "We also want our systems to be highly responsive to processed sensor data to enable spacecraft autonomy, which would reduce the amount of human interaction needed to operate the spacecraft and interpret data."
"Everyone in the space community wants to build sensor systems that are more powerful and autonomous", Alan George stated. "We must process the data where it's gathered, which requires very powerful computers, but space is the most challenging place to build and deploy powerful computers."
Space, too, is a challenging place for computers to thrive due to high fluctuations in temperatures, strong vibrations during launch and higher levels of radiation - all of which can affect performance, said Sebastian Sabogal.
During its time in space, the supercomputer will gather and monitor data on weather patterns, deforestation, and the effects of natural disasters on Earth and the effects of space and radiation on electronic devices, among many applications in Earth and space science.
SHREC also is collaborating for the first time with the Swanson School of Engineering's Department of Mechanical Engineering and Materials Science, with the latter designing, assembling and testing the system chassis to meet the structural requirements from NASA for the computing system.
For students, these space missions are an opportunity to hone their engineering expertise and interact closely with experts at NASA and the U.S. Department of Defense.
"When I initially came in, it was one of the big projects going on here", stated Evan Gretok, a second-year PhD student studying electrical and computer engineering. "I was asked if I was up for a challenge, and I was put on developing some of the flight software for some of the secondary objectives of the mission."
These secondary objectives include studies regarding flight services, hardware configuration and studies on image processing.
Evan Gretok also earned his master's degree in the same field at Pitt this year, and he has been working with the NASA Marshall Space Flight Center in Huntsville, Alabama, to certify the supercomputer's ground-station software for mission operations that will be controlled by Pitt researchers in the SHREC lab meets NASA standards.
"It's really humbling to be part of a team that has this kind of access to such innovative technology", Evan Gretok stated. "The amount of opportunities that open up for Earth observation for data analytics and for these students to develop their own applications and algorithms is exciting to see."
Other leading researchers for the project include Matthew Barry, an assistant professor of mechanical engineering and materials science, who also works with the Center for Research Computing and was in charge of thermal modeling for the computer, and David Schmidt, an associate professor of mechanical engineering and materials science, whose team was in charge of the design and construction of the aluminum chassis to house the electronics, ensuring that it meets NASA specifications.