50 Vendors Vie For Air Force Flying Car

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  4 janvier 2024 | International, Aérospatial

  Pakistan to buy Chinese FC-31 fighter jets, says air chief

  Pakistan is set to acquire the Chinese FC-31 Gyrfalcon fifth-generation fighter, according to head of the Pakistan Air Force.

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  2 juin 2020 | International, Naval

  All aboard the Sea Train!

  Imagine the following scenario. Four medium-sized U.S. Navy vessels depart from a port along the United States' coast. There's no crew aboard any of them. About 15 nautical miles off the coast, the four vessels rendezvous, autonomously arranging themselves in a line. Using custom mechanisms, they attach to each other to form a train, except they're in the water and there's no railroad to guide them. In this configuration the vessels travel 6,500 nautical miles across the open ocean to Southeast Asia. But as they approach their destination, they disconnect, splitting up as each unmanned ship goes its own way to conduct independent operations, such as collecting data with a variety of onboard sensors. Once those operations are complete, the four reunite, form a train and make the return journey home. This is the Sea Train, and it may not be as far-fetched as it sounds. The Defense Advanced Research Projects Agency is investing in several technologies to make it a reality. “The goal of the Sea Train program is to be able to develop and demonstrate long-range deployment capabilities for a distributed fleet of medium-sized tactical unmanned vessels,” said Andrew Nuss, DARPA's program manager for Sea Train. “So we're really focusing on ways to enable extended transoceanic transit and long-range naval operations, and the way that we're looking to do that is by taking advantage of some of the efficiencies that we can gain in a system of connected vessels — that's where the name ‘Sea Train' comes from.” According to DARPA, the current security environment has incentivized the Navy and the Marine Corps to move from a small number of exquisite, large manned platforms to a more distributed fleet structure comprised of smaller vessels, including unmanned platforms that can conduct surveillance and engage in electronic warfare and offensive operations. While these unmanned vessels are smaller and more agile than their large, manned companions, they are limited by the increased wave-making resistance that plagues smaller vessels. And due to their size, they simply can't carry enough fuel to make the long-range journeys envisioned by DARPA without refueling. By connecting the vessels — physically or in a formation — the agency hopes the Sea Train can reduce that wave resistance and enable long-range missions. In February, the agency released a broad agency announcement to find possible vendors. Citing agency practice, Nuss declined to share how many proposals were submitted, although he did say there was significant interest in the announcement. The agency completed its review of any submissions and expects to issue contracts by the end of the fiscal year. Sea Train is expected to consist of two 18-month periods, where contractors will work to develop and test technologies that could enable the Sea Train concept. The program will culminate with model testing in scaled ocean conditions. If successful, DARPA hopes to see the technologies adopted by the Navy for its unmanned platforms. “What we're looking to do is be able to reduce the risk in this unique deployment approach,” Ness said. “And then be able to just deliver that set of solutions to the Navy in the future, to be able to demonstrate to them that there is, potentially, a new way to deploy these vessels, to be able to provide far more operational range without the risk of relying on actual refueling or in-port refueling.” And while DARPA's effort is focused on medium-sized unmanned vessels — anywhere from 12 to 50 meters in length — the lessons learned could be applied to larger or smaller vessels, manned or unmanned. https://www.c4isrnet.com/unmanned/2020/06/01/all-aboard-the-sea-train/

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  13 mai 2020 | International, Naval, C4ISR

  Failure to communicate: US Navy seeks faster data transfers amid Arctic ice

  Andrew Eversden WASHINGTON — Research in the Arctic Ocean is no small feat. The area can prove inaccessible at times, and sensors can fail to communicate data from under the ice or get crushed by slabs of ice. But with the Arctic getting warmer and ice melting at an accelerated rate, the U.S. Navy is preparing to operate in newly available waterways. To do that effectively, the service knows it will take intense research to create durable, innovative solutions that can withstand harsh conditions, while also relaying data to researchers. “If the Navy's thinking about having to run operations up there with submarines, surface vessels and aircraft, you really need to understand that operational environment,” Scott Harper, the Office of Naval Research's program manager for Arctic and global prediction, told Defense News in a May 4 interview. “Where is that sea ice and how quickly is it retreating? And what is it doing to the upper water column in the ocean? "To really understand all that, you need to have a lot of observations.” Navy and academic researchers are working together to improve the service's forecasting models in the Arctic. The Navy currently has research buoys, sensors and other technology floating in the water to track a variety of metrics: waves, atmospheric and water circulation, sea ice thickness and cover, speed at which the ice moves, and several other factors. All those metrics factor into Arctic forecasting. In order to improve its forecasting capabilities, the Navy needs to improve its numerical models, or complex equations used in predictions. But to do that, the service needs more up-to-date data. “These numerical models are kind of like balancing your checkbook,” Harper said. “You need to start with what your current checking account balances [to[ if you're going to predict what it's going to be at the end of the month. And so even if you had a perfect numerical model that you could use to make a forecast, if you don't know what the conditions are right now, you're not going to be able to forecast what the future state is going to be.” To do this, the Navy wants to more quickly collect data through an effort called the Arctic Mobile Observing System, or AMOS. The program aims to create near-real-time data transmission of the sea condition under the ice, and communicate that information to the Navy via satellite. “You have satellites that can look down at the surface of the Arctic Ocean and the sea ice conditions,” Harper said. “But what we don't have [is] the ability to look under the ice and understand what the ocean conditions are, and that's what we're really trying to enable with Arctic Mobile Observing System prototype.” The AMOS program has deployed gliders underneath the sea that are collecting and storing data about the oceanic conditions under the ice, and tracking the location of frozen water using acoustics. In a few months, Harper said, researchers will send an icebreaker to the Arctic and gather the data collected by the gliders. The Office of Naval Resarch, however, would like to bypass the multi-month delay involved in collected the data. To do so, the office plans to enable two-way communication so underwater sensors can communicate data via floating buoys in the ice that, in turn, communicate the data via satellites back to the Naval Oceanographic Office. The project is currently two years into the five-year project. According to the project website, it's slated to end in fiscal 2023 with the recovery and evaluation of the initial prototype in the late summer of 2023. Harper said the project's biggest success has been the navigation system that's currently working underneath the ocean surface. “The fact that we can put sensors out that will know where they are without having to come to the surface to get a GPS fix — because they can't come to the surface because there's sea ice there for nine months out of the year," he said. "That's a big win.” Another critical component to the real-time data collection are the buoys that ultimately must be able to survive the cruel nature of Arctic ice. The AMOS team has deployed prototypes of “ice-hardened” buoys that survived “multiple months” in the Arctic environment, Harper said, paving the way for a fully equipped communications buoy that can talk with underwater sensors. “You can go out there and you can put your sensors in the ice, but a lot of times they'll fail,” Harper said. “And they'll fail because they'll get crushed in the ice or tipped over or toppled by changing ice conditions. And so the ability to deploy a buoy that is robust enough to survive the sea ice is one of the technological hurdles to doing this.” https://www.c4isrnet.com/smr/frozen-pathways/2020/05/11/failure-to-communicate-us-navy-seeks-faster-data-transfers-amid-arctic-ice/