23 janvier 2019 | International, C4ISR
DARPA's Radio Frequency Risk Reduction Deployment Demonstration (R3D2) is set for launch in late February to space-qualify a new type of membrane reflectarray antenna. The antenna, made of a tissue-thin Kapton membrane, packs tightly for stowage during launch and then will deploy to its full size of 2.25 meters in diameter once it reaches low Earth orbit.
R3D2 will monitor antenna deployment dynamics, survivability and radio frequency (RF) characteristics of a membrane antenna in low-Earth orbit. The antenna could enable multiple missions that currently require large satellites, to include high data rate communications to disadvantaged users on the ground. A successful demonstration also will help prove out a smaller, faster-to-launch and lower cost capability, allowing the Department of Defense, as well as other users, to make the most of the new commercial market for small, inexpensive launch vehicles. Satellite design, development, and launch took approximately 18 months.
“The Department of Defense has prioritized rapid acquisition of small satellite and launch capabilities. By relying on commercial acquisition practices, DARPA streamlined the R3D2 mission from conception through launch services acquisition,” said Fred Kennedy, director of DARPA's Tactical Technology Office. “This mission could help validate emerging concepts for a resilient sensor and data transport layer in low Earth orbit – a capability that does not exist today, but one which could revolutionize global communications by laying the groundwork for a space-based internet.”
The launch will take place on a Rocket Lab USA Electron rocket from the company's launch complex on the Mahia Peninsula of New Zealand. Northrop Grumman is the prime contractor and integrated the 150 kg satellite; MMA Design designed and built the antenna. Trident Systems designed and built R3D2's software-defined radio, while Blue Canyon Technologies provided the spacecraft bus.
Rocket Lab will host a webcast and provide coverage of the launch via live stream: http://www.rocketlabusa.com/live-stream.
18 septembre 2023 | International, Naval
“I don’t mind breaking my own back,” said Gen. Eric Smith, who is both the acting and assistant commandant. “It’s just, I have to make good decisions.”
28 août 2023 | International, C4ISR
US institutions try to boost their domestic semiconductor industry as the commodity becomes a hot topic in the nation’s tech war with China.
21 juillet 2020 | International, Naval
By: David B. Larter Update: The headline of this story was changed to more accurately characterize the incident onboard the amphibious assault ship Kearsarge. WASHINGTON — A rapidly extinguished fire aboard the amphibious assault ship Kearsarge prompted the Navy to issue a “stop work order” Friday to General Dynamics NASSCO shipyard in Norfolk, Naval Sea Systems Command told Defense News Saturday. The incident started when a spark from welding landed on nearby material, which was then quickly put out by the fire watch. Fire watch is a sailor or contractor who stands nearby with a fire hose and/or extinguisher to stop a larger blaze in its tracks. In a statement, Naval Sea Systems Command spokesman Rory O'Connor said the “stop work” was to ensure the company followed fire safety protocols. “On July 17, the Navy was informed of a fire aboard USS Kearsarge (LHD 3), currently conducting a Selected Restricted Availability at General Dynamics NASSCO – Norfolk,” O'Connor said. “The fire was quickly extinguished by the fire watch and resulted in minimal damage. In response to this incident, the Navy has issued a stop work order for all ships in maintenance availabilities at GD NASSCO Norfolk to ensure compliance with all established fire protocols and procedures.” In a phone call Saturday, Anthony Paolino, a General Dynamics NASSCO spokesman, said the incident involved an ember landing on plastic, causing it to melt and smoke, but said there was no larger fire. NASSCO was already reviewing its safety protocols prior to the “stop work” order, and that it fully supported the Navy's ongoing safety stand down in the wake of this week's fire aboard Bonhomme Richard, Paolino said. In a phone call Saturday, Anthony Paolino, a General Dynamics NASSCO spokesman, said the incident involved an ember landing on plastic, causing it to melt and smoke, but said there was no larger fire. NASSCO was already reviewing its safety protocols prior to the “stop work” order, and that it fully supported the Navy's ongoing safety stand down in the wake of this week's fire aboard Bonhomme Richard, Paolino said. Once those investigations are finished, Gilday will determine whether a broader examination of the Navy's culture is necessary. “This is a very, very serious incident that I think will force the Navy to stand back and reevaluate itself,” Gilday said. “We've got to follow the facts, we've got to be honest with ourselves and we've got to get after it. My intention, once the investigations are done, is to make this available for the public to debate, including what we need to do to get after any systemic problems that we might have.” https://www.defensenews.com/naval/2020/07/18/us-navy-orders-to-general-dynamics-nassco-to-stop-work-after-fire-on-uss-kearsarge/