Defense

January 13, 2014

DARPA programs create new future for space, director says

Current deep-space search telescopes can’t provide a full picture of objects such as microsatellites and space debris that threaten military satellites. Gaps in observational coverage hamper space situational awareness in this critical area. Begun in 2002, the Space Surveillance Telescope program aims to enable ground-based, broad-area search, detection and tracking of small objects in deep space for purposes such as space mission assurance and asteroid detection. The telescope achieved first light in February 2011. SST completed its Defense Advanced Research Projects Agency test and evaluation period in August 2012. DARPA will now help Air Force Space Command to undertake a military utility assessment study of SST by taking observations to demonstrate SST’s performance over a full lunar cycle.

Space is critical to understanding the planet and how the United States safeguards national security, but the costs and difficulties of reaching the domain have slowed U.S. effectiveness in space, the director of the Defense Advanced Research Projects Agency said Jan. 13.

Speaking at SciTech 2014, a technical conference hosted by the American Institute of Aeronautics and Astronautics, Arati Prabhakar explained that now is an important time to think in fresh ways about how to break that paradigm.

In many ways the situation takes Prabhakar back to 1958, she said, when DARPA was established partly because of the technological surprise delivered in 1957 by Sputnik, the world’s first artificial satellite, launched by the Soviet Union and marking the start of the space age.

“I think we’re in the middle of a self-inflicted surprise in some sense in space today,” the director said. “It’s a very different kind of surprise, but it’s one that is rendering us ineffective and putting us in a place [where] we simply cannot afford to be.”

DARPA, the Defense Department’s research and development enterprise, has a portfolio that includes hypersonic technology in rethinking air dominance for the future, new ways to control the electromagnetic spectrum, new cyber opportunities, big data analytics, brain function, outpacing the threat of infectious disease, and accelerating the development of synthetic biology.

Another part of DARPA’s portfolio is rethinking national security space, Prabhakar said.

“Today we are extremely effective at waging a kind of precise lethal war,” she added. “It’s something that is a core element of our national security today, but it is a kind of warfighting capability that’s simply not possible without the assets that we have on orbit.”

Around the national security environment, the director said, space is becoming increasingly congested as more commercial activity takes place in orbit and as other nations stake their claims in space.

“There’s also something going on inside the national security community in space that’s actually quite troubling,” Prabhakar said. “That has to do with how slow and costly it is for us today to do anything we need to do on orbit for national security purposes.”

The director said the situation reminds her of living on a lake in Reston, Va., many years ago and watching ducks on the water in winter.

“I would look out at the lake, and … these ducks would cluster at twilight, and they’d sit in the lake, and they would stop moving, and the lake would start icing up around them. Eventually, they would just freeze in place on this lake,” she said. “Tragically, that’s what it feels like to me when I think about where we are in terms of our ability to react and do what we need to do quickly, cost effectively in space for national security purposes.”

At DARPA, scientists are working on three projects – involving space launch, satellites and real-time domain awareness – that the director said she thinks will create a very different future for space.

It can cost tens of millions of dollars to get even a very small satellite to orbit, and years to schedule the launch, she said, because only a few fixed sites around the world can launch such craft.

“Today at DARPA, we’re investing in programs that we hope will change that model and allow for the ability to launch on 24-hour call-up from anywhere around the world,” Prabhakar said.

With DARPA’s Airborne Launch Assist Space Access program, called ALASA, the idea is for an aircraft to carry a small satellite and its host-booster inside the plane or externally. At the right altitude and direction, the aircraft would release the satellite and booster and both would continue climbing into space.

A key benefit of the system is that, within a day of being called up, a satellite launch mission could be conducted from a runway anywhere in the world. Another advantage is the flexibility of an aircraft to deliver a satellite into any orbit at any time, according to DARPA.

“Our ALASA program … aims to be able to get a [100-pound] satellite to [low-Earth orbit] for about $1 million. Our new experimental spaceplane program, XS-1, aims to develop a reusable first stage that enables a cost in the range of $5 million to get 3,000 pounds to 5,000 pounds to LEO,” the director said.

These changes are dramatic, she added, because the price would be a revolution in capability and because of the flexibility and rapid call-up.

“These are important new dimensions and new ways of thinking about launch,” Prabhakar said.

The second project involves satellites, she added.

“Today you assemble and create these very complex systems here on the ground. We launch them and when we get to orbit what we’ve got is what we’ve sent up, and it’s a very inflexible capability in that regard,” she explained.

DARPA’s Phoenix program is working to create a future in which space robotics technologies can service satellites and even assemble them on orbit, and reuse components of old or nonworking satellites perhaps on orbit.

“As we develop those capabilities at [geostationary orbit, or GEO] we believe that we’re going to start changing the fundamental dynamics and economics of what’s going to be possible in terms of satellite capability,” the director said.

The third project simply has to do with knowing what’s going on in orbit, she added.

“Space is becoming a real-time domain, and it’s no longer good enough to sort of know what’s up there. We really need to start moving to a future of space traffic control, more like flight traffic control for the air domain,” Prabhakar said.

DARPA has several programs that reach for this future, she said. One is the Space Surveillance Telescope, or SST, that can see very dim objects at geostationary orbit across a broad swath of the sky. DARPA has demonstrated this telescope capability in New Mexico and now is in the process of moving to Australia in cooperation with the Australian government.

“In addition to changing what we do, the director added, “I think how we work in space and how we work together to achieve these new capabilities is equally important. DARPA has a long history of working with a broad technical community, spanning universities, companies large and small and labs of all different sorts.”

In the national security space environment, she said, “I think all of us in DOD have had a tendency to focus in a narrower fashion on the capabilities we think are important for our missions. And today we’re at a juncture where it’s critically important that we find new ways of working more broadly with the civilian and commercial space communities.”

This is true, Prabhakar added, “first, because we have shared interests, and secondly because the challenges we face are so significant that we simply are not going to get there any other way.”




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