27 avril 2021 | International, Aérospatial, Naval, Terrestre, C4ISR, Sécurité
The world spent almost $2 trillion on defense in 2020
The U.S. and China made up more than half of all military spending in 2020.
4 septembre 2020 | International, C4ISR
Harnessing Quantum Technologies at Room Temperature
Quantum research in both information science and sensing shows great promise for enabling a host of new defense applications. A major hindrance to transitioning breakthroughs from the laboratory to practical use, however, is the extensive equipment needed to cool and trap atoms to exploit their quantum features.
To address this challenge, DARPA has announced its Science of Atomic Vapors for New Technologies (SAVaNT) program. SAVaNT seeks to advance the performance of room-temperature atomic vapors to enable future opportunities for unprecedented combinations of low size, weight, and power (SWaP) with performance across multiple Department of Defense domains.
“The SAVaNT program will explore a new suite of technologies based on room-temperature atomic vapors to address important gaps for military-relevant applications,” said Tatjana Curcic, program manager in DARPA's Defense Sciences Office. “We're interested in innovative research proposals that significantly advance the performance of atomic vapors for electric field sensing and imaging, magnetic field sensing, and quantum information science.”
The program is focused on warm atomic vapors as opposed to cold-atom technology, which requires cooling atoms to very low temperatures with lasers to reduce thermal noise. This process has enabled the world's most accurate atomic clocks with unprecedented levels of timing precision. But the apparatuses needed to cool the atoms can fill up a laboratory, making laboratory atomic clocks impractical for field use. The warm atomic vapors approach, on the other hand, doesn't require complex laser-cooling and allows for a larger number of atoms, boosting the signal. The challenge, however, is that thermal environment effects – even at room temperature – significantly mitigate how long the quantum effects, or coherence, can last.
SaVaNT researchers will demonstrate novel methods in three technical areas to overcome limitations due to thermal effects: Technical Area 1 seeks to develop a Rydberg sensor – which uses atoms to sense electric fields – that would provide ultra-narrow bandwidth, high-sensitivity electric field detection for millimeter waves. Technical Area 2 focuses on Vector Magnetometry to enable low-SWaP, room-temperature, quasi-DC magnetic field sensors. The third technical area will address vapor quantum electrodynamics to enable critical components for quantum networks at room temperature. Current methods require either cryogenics or laser cooling and trapping.
A Proposers Day for interested proposers will be held virtually via webinar on Sept. 3. The Broad Agency Announcement (BAA) solicitation with full details is available here: https://go.usa.gov/xGr4C
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13 juillet 2023 | International, Terrestre
Ground vehicles are the new frontier in Ukraine's drone war
After the role of unmanned aerial vehicles in the Ukraine war expanded dramatically since Russia invaded 16 months ago, attention is turning to ground drones that developers say could be the next frontier in military innovation.
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29 octobre 2018 | International, Aérospatial
US Air Force explores space-based cargo operations, confirms talks with SpaceX
By: Jeff Martin GRAPEVINE, Texas — The U.S. Air Force is exploring the logistics of space-based cargo operations under the purview of Air Mobility Command, even as the impact of a new Space Force on the mobility community remains to be seen. “I don't know how it will affect mobility, but most of you know space affects mobility every day,” Gen. Paul Selva, vice chairman of the Joint Chiefs of Staff, said Thursday at the 2018 Airlift/Tanker Symposium outside Dallas, Texas. “Whatever the Space Force is or does, it has to protect our national interest in space,” he said, adding that GPS is critical to the air mobility community. As for what space cargo operations could look like, the previous head of Air Mobility Command, Gen. Carlton Everhart, espoused the possibility of moving cargo using rocketsduring a Defense Writers Group breakfast in August. “Think about this. Thirty minutes, 150 metric tons [and] less than the cost of a C-5,” he said at the time. Apart from cargo operations, such a focuses space presence could help with pre-positioning equipment and supplies in orbit, ready to be dropped to Earth. But in a roundtable with reporters Friday, the new commander of AMC, Gen. Maryanne Miller, said while the command continues to study the possibility, space cargo operations remain at the conceptual stage. “We're continuing, our [planning] community is going to continue to have discussions with the space companies, and we have agreed to just sit with them and just stay up to date with where they're going with their future plans, to just be at the table with them” she said. “We won't commit any resources, but we've committed to work with them to see how quickly they progress through that." One potential would be SpaceX's next-generation reusable BFR rocket, currently under development. During the roundtable, Miller confirmed that the Air Force had spoken to SpaceX about the idea. “They have talked about moving cargo in space, and we've sat down with SpaceX and had that discussion. But it's really just discussion at this point," she said. “Our connection with space is really just going to be at the table with them, to look at how much progress they're making.” As for what type of cargo could possibly be moved, that's still being discussed. But in August, Everhart said he'd be willing to stick “anything” in space. https://www.defensenews.com/digital-show-dailies/airlift-tanker-annual/2018/10/26/us-air-force-explores-space-based-cargo-operations-confirms-talks-with-spacex