6 mai 2020 | International, Aérospatial
Nathan Strout
The Space Development Agency is seeking proposals for its first batch of satellites, which will make up its initial transport layer — an on-orbit mesh network that will connect space-based sensors with terrestrial shooters.
According to the May 1 solicitation, SDA is looking to award two contracts to build a total of 20 small satellites, which will comprise Tranche 0 of the National Security Space Architecture, a proliferated, low-Earth orbit constellation that will fulfill a multitude of military needs, including tracking hypersonic weapons; providing alternative position, navigation and timing data; delivering beyond-line-of-sight targeting; and more. Ultimately, the agency envisions a constellation made up of hundreds of interconnected satellites.
Ten of those Tranche 0 satellites will form the agency's initial transport layer.
The spiral development approach
The agency is taking a spiral development approach to its National Security Space Architecture. Tranche 0 will be a testing and training segment that will demonstrate the integration of the architecture with other war-fighting efforts and inform future SDA developments.
Tranche 0 is anticipated to be on orbit in the fourth quarter of fiscal 2022, with the SDA adding new tranches of satellites every two years, increasing the constellation's size and capabilities.
Launch services will be acquired through the Orbital Services Program 4 contract or follow-on contracts.
The philosophy behind the spiral approach is that the two-year cycles allow the agency to rapidly put new capabilities on orbit in response to evolving threats. Instead of waiting years for the perfect satellite system, the agency wants to push technologies that are currently ready into orbit as soon as possible, giving war fighters increased capabilities in the near term.
With Tranche 0, the SDA wants to achieve periodic, regional, low-latency data connectivity. With Tranche 1, which will add 150 satellites to the constellation, the agency plans to provide persistent regional connectivity.
Building a mesh network
The National Security Space Architecture will be made up of several layers serving different functions. Tranche 0 will establish the transport layer, a space-based mesh network that will be able to pass data from one satellite to the next. The mesh network will operate as part of the Integrated Broadcast System, the Defense Department's standard network for transmitting tactical and strategic intelligence and targeting data.
The key technology that will enable the transport layer are optical inter-satellite cross links, providing approximately 1 Gbps connections between the satellites. Each Transport Layer satellite will have four such cross links — forward, behind, right and left — which will allow them to pass data on to the nearest or next-nearest transport layer satellite operating in the same orbital plane.
The satellites will also be capable of cross-plane cross links, meaning they will be able to connect to non-transport layer satellites operating above or below them. Assuming that they also have optical inter-satellite cross links, these non-transport layer satellites would then be able to pass data through the transport layer's mesh network to another satellite or even to a terrestrial shooter.
For example, it could work like this: A space-based sensor collects imagery that it wants to pass to a ground-based system, but it is not within range of any ground station. No problem. The sensor would pass on that imagery to a transport layer satellite via an cross-plane optical cross link. The data would then bounce from transport layer satellite to transport layer satellite until it arrives above its destination, where it would then be downlinked to an optical ground terminal or distributed to the appropriate weapons system via the Link 16 tactical data network.
In theory, this would allow shooters to receive space-based sensor data in near-real time.
Since the SDA plans to continue building on the transport layer in subsequent tranches across multiple vendors, the optical inter-satellite cross links will need to be designed with interoperability in mind. The SDA also wants radio frequency cross links as a backup to the optical cross links.
Tranche 0 will include 10 transport layer satellites — three of which will include Link 16 payloads.
During an April industry day, SDA Director Derek Tournear said this initial, space-based mesh network will form the space network component to the Defense Department's Joint All-Domain Command and Control enterprise, or JADC2.
“The transport layer, which is what the draft [request for proposals] and the industry day was talking about today, is going to be the unifying effort across the department. That is going to be what we use for low-latency [communications] to be able to pull these networks together, and that, in essence, is going to be the main unifying truss for the JADC2 and that effort moving forward. That is going to be the space network that is utilized for that,” Tournear explained.
The agency has six goals for its Tranche 0 transport layer:
According to the request for proposals, the SDA plans to award a contract Aug 10, with delivery expected by July 31, 2022. Responses to the solicitation are due June 1.
10 janvier 2024 | International, Aérospatial
The group brings together existing private capital networks in the three countries with a goal of increasing investment in national security innovation.
26 décembre 2019 | International, Naval
By: David B. Larter WASHINGTON – The Department of Defense has sent a plan to the White House that would cut the construction of more than 40 percent of its planed Flight III Arleigh Burke destroyers in in fiscal years 2021 through 2025. In total, the proposal would cut five of the 12 DDGs planned through the so-called future years defense program, or FYDP. In total, the plan would cut about $9.4 billion, or 8 percent, out of the total shipbuilding budget, according to a memo from the White House's Office of Management and Budget to the Defense Department obtained by Defense News. The memo also outlined plans to accelerate the decommissioning cruisers, cutting the total number of Ticonderoga-class cruisers in the fleet down to nine by 2025, from a planned 13 in last year's budget. The Pentagon's plan would actually shrink the size of the fleet from today's fleet of 293 ships to 287 ships, the memo said, which stands in contrast to the Navy's goal of 355 ships. The 355 ship goal was also made national policy in the 2018 National Defense Authorization Act. The memo comes on the heels of a wave of rhetoric from the Navy and the highest levels of the Trump Administration that the goal remains 350-plus ships, and the memo directs the Pentagon to submit a “resource-informed” plan to get to 355 ships, though its unclear how that direction might affect the Navy's calculus with regards to destroyer construction. The document gives the Navy a degree of wiggle-room to try and redefine what counts as a ship. “OMB directs DOD to submit a resource-informed plan to achieve a 355-ship combined fleet, including manned and unmanned ships, by 2030,” the memo reads. “In addition to a programmatic plan through the FYDP and projected ship counts through 2030, DOD shall submit a legislative proposal to redefine a battleforce ship to include unmanned ships, complete with clearly defined capability and performance thresholds to define a ship's inclusion in the overall battleforce ship count.” Destroyers are built by General Dynamics Bath Iron Works in Maine and by Huntington Ingalls in Pascagoula, Mississippi. Each destroyer costs an average of $1.82 billion based on the Navy's 2020 budget submission, according to the Congressional Research Service. A Trump Administration official who spoke on background said the Navy's proposed plan to shrink the fleet is being driven primary from the Office of the Secretary of Defense, and that OMB is strongly behind the President's goal of 355 ship. “OMB strongly supports 355 [ships] and is working with the Navy on it,” the official said. “OSD seems to be the most opposed to it.” A Navy spokesman declined to comment on the contents of the memo, saying it was related to a budget still in development and was “pre-decisional.” The military has a policy of refusing to comment on budget matters before they've been submitted to congress. The fate of the cruisers has been a nearly annual fight on Capitol Hill, as the Navy has tried desperately to divest themselves of the troublesome class, though this year's proposed cancellation of six cruiser modernization plans did not make a stir on the Hill. The cruisers themselves are the largest surface combatants in the Navy's inventory but have become increasingly difficult to maintain. Cruisers have 26 more vertical launch system, or VLS, cells per hull than their Arleigh Burke Flight IIA destroyer counterparts, and 32 more than the Flight I Burkes. Cruisers act as the lead air defense ship in a carrier strike group but as they have aged, the fleet has managed everything from cracking hulls to aging pipes and mechanical systems. The ships' SPY-1 radars have also been difficult to maintain, as components age and need constant attention from technicians. Last year, the Navy proposed canceling the modernization of Bunker Hill, Mobile Bay, Antietam, Leyte Gulf, San Jacinto and Lake Champlain in 2021 and 2022. The new proposal would accelerate the decommissioning of the Monterey. Vella Gulf and Port Royal to 2022, which would cut between three and seven years off each of their planned lives. The plan would also advance the decommissioning of the Shiloh to 2024, three years earlier that previously planned. The service's past efforts to shed the cruisers to save money repeatedly drew the ire of former House Armed Services Committee sea power subcommittee Chairman Randy Forbes, R-Va., who didn't trust the Navy to keep the ships in service and therefore wrote clear language into several National Defense Authorization Act bills prohibiting the move. The Navy ultimately agreed to the so-called 2-4-6 plan in 2015, which allowed the service to lay up to two cruisers a year, for no more than four years and allow no more than six of the ships to undergo modernization at any one time. 'Making a Case' The 2030 deadline for 355 ships as mentioned in the OMB memo was first laid out earlier this month by acting Secretary of the Navy Thomas Modly in a speech at USNI's Defense Forum. “[Three hundred and fifty-five ships] is stated as national policy,” Modly told an audience on Dec. 5. “It was also the president's goal during the election. We have a goal of 355, we don't have a plan for 355. We need to have a plan, and if it's not 355, what's it going to be and what's it going to look like? “We ought to be lobbying for that and making a case for it and arguing in the halls of the Pentagon for a bigger share of the budget if that's what is required,” The speech was followed by the President's National Security Adviser Robert O'Brien at the Reagan National Defense Forum saying that Trump was serious when he committed to a 350-ship Navy. “When President Trump says a 350-ship Navy, he means a 350-ship Navy, and not decades from now,” O'Brien said. Bryan McGrath, a retired destroyer captain and analyst with the defense consultancy The Ferrybridge Group, said the plan to reduce the size of the fleet is a sign that the Defense Department isn't willing to put the resources required toward growing the fleet. “If what you are reporting is true, this is a sign of the tension between the grand desires for a much larger fleet and the modest resources being applied to the problem,” McGrath said. “There simply is no way to grow the fleet as it is currently architected while maintaining the current fleet at a high state of readiness with the given resources." McGrath said if 355 is still the goal, the Pentagon has to either dramatically restructure the fleet to switch out large surface combatants such as cruisers and destroyers with smaller, less expensive ships, or it has to change what's counted as a ship – both moves that have been signaled by the Navy in recent years. “This is why it's so hard to grow a Navy,” McGrath said. “You have to decide it's a national priority, you have to devote a lot of resources and you have to do it over a period of years. None of that has happened.” Dan Gouré , an analyst with the Arlington-based think tank The Lexington Institute and former Bush Administration Pentagon official, said trading existing force structure for unproven technologies such as unmanned ships that may pan out down the road is a classic Pentagon trap that rarely pans out. “It sends a bit of a chill up my spine to hear that the Navy may be considering cutting a bird in the hand for a theoretical eagle down the road,” Goure said. “That almost never works. I've been doing this long enough, 40 years of this, tell me when that's ever really worked.” https://www.defensenews.com/naval/2019/12/24/pentagon-proposes-big-cuts-to-us-navy-destroyer-construction-retiring-13-cruisers/
4 janvier 2019 | International, Aérospatial
By: Kyle Rempfer A growing cohort of Air Force researchers are arguing that the service needs to undergo a munitions revolution if it is to take on a peer-level adversary in open conflict. “We're developing a range of technologies to enable next-generation and improve precision effects on the battlefield,” Col. Garry Haase, who helms the Air Force Research Lab Munitions Directorate, told an audience at the Air Force Association Annual Conference this fall. In some instances, that will mean more powerful munitions to breach and destroy Russian and Chinese structures in the event of war. “There is now a shift in emphasis away from minimizing to maximizing effects in a high-end fight,” said John Wilcox, vice president of advanced programs and technology at Northrop Grumman, at the conference. “Requirements from our missions directorate say we continue to have to deal with the whole spectrum of threats as we shift to more of a near-peer threat focus,” Wilcox added. “We are looking at larger munitions with bigger effects.” And while neither members of the AFA panel named Russia or China specifically, a recent study by the Mitchell Institute, which is aligned with the Air Force Association, certainly did. In the document, titled “The Munition Effects Revolution," several retired senior Air Force officers argue that the U.S. munitions arsenal is overdue for a shakeup. “The bomb body, a steel shell filled with explosive material, is relatively unchanged across the past 100 years," the study reads. "But some elements of modern munitions have significantly evolved—particularly guidance elements. Munition effects—the destructive envelope of heat, blast, and fragmentation—remain essentially unchanged.” High demand for combat aircraft is a key driver behind the need for enhanced munitions options, according to the Mitchell Institute. “The Air Force is currently operating the smallest and oldest aircraft force in its history,” the study reads. “Additionally, current mission capable rates are low and pilots are in increasingly short supply. To best meet combatant command requirements amidst these constraints, it is crucial to ensure each sortie flown and every bomb dropped yields maximum potential.” https://www.airforcetimes.com/news/your-air-force/2019/01/03/new-in-2019-air-force-looks-for-new-bomb-designs-to-fight-russia-and-china