31 octobre 2019 | International, Aérospatial

As Era Of Laser Weapons Dawns, Tech Challenges Remain

Steve Trimble

As the U.S. Air Force comes within weeks of the first operational laser weapons, the Defense Department is hatching new concepts to address the power and thermal management limits of the state-of-the-art in the directed energy field.

In a largely secret dress rehearsal staged last week at Fort Sill, Oklahoma, the Air Force performed another round of tests of the deploying Raytheon High Energy Laser Weapon System (HEL-WS), as well as other directed energy options, such as the Air Force Research Laboratory's Tactical High Power Microwave Operational Responder (THOR), says Kelly Hammett, director of AFRL's Directed Energy Directorate.

“All I can say is there were multiple systems. From my reading of the reports, it looked like a very successful exercise,” says Hammett, who addressed the Association of Old Crows annual symposium Oct. 29.

The Fort Sill experiment was intended to put the weapons through their paces in a realistic operational environment. AFRL's Strategic Development, Planning and Experimentation (SDPE, which, despite its spelling, is pronounced “Speedy”) office called on the HEL-WS and THOR to engage swarms of small unmanned aircraft systems (UAS). The experiments also demonstrated new diagnostic tools, allowing AFRL testers to understand the atmosphere's effect on energy propagation in real time.

SDPE awarded Raytheon a contract in August to deliver a “handful” of systems to the Air Force for a one-year deployment scheduled to conclude in November 2020. The HEL-WS will be used to defend Air Force bases from attacks by swarming, small UAS and cruise missiles, Hammett says. The Air Force is not releasing the location of the deployed sites for the HEL-WS.

AFRL also is grooming THOR for an operational debut. Instead of blasting a UAS with a high-energy optical beam, THOR sends powerful pulses of radio frequency energy at a target to disable its electronics. Hammett describes THOR as a second-generation directed energy weapon. It is designed to be rugged for operational duty and compact enough to be transported inside a single container loaded into a Lockheed Martin C-130. Upon unloading from the aircraft, THOR can be activated within a couple hours, or broken down and moved within the same period, he says.

Despite decades of basic research on directed energy systems, such operational capabilities have evolved fairly rapidly. The Air Force finally consolidated its strategy for developing directed energy weapons in the 2017 flight plan, Hemmett said. The document narrowed a once-fragmented research organization that attempted to address too many missions.

“Directed energy zealots like myself have been blamed, rightly so, of saying directed energy can do almost anything you want it to do. And we pursued multiple applications to the effect that we were diffusing some of our efforts,” he says.

The 2017 flight plan selected three initial use cases: Air base defense, precision strike and self-protect.

The HEL-WS and THOR are addressing the first mission. The Joint Navy-Air Force High Power Electromagnetic Non-Kinetic Strike (Hijenks) program is developing a missile to address the precision strike requirement, as a follow-on to the Counter-electronics High Power Microwave Advanced Missile Project (Champ) that concluded five years ago. In the long-term, AFRL also plans to demonstrate the Self-Protect High Energy Laser Demonstrator (Shield), a podded defensive weapon for aircraft.

Although such technology has come far, researchers are still grappling with fundamental issues to make them practical. Namely, the power generation and thermal management requirement for high-energy lasers and high-power microwaves remains a challenge.

“If you're willing to have very limited duty-cycle, very limited magazine, the power and thermal management aren't very challenging,” Hemmett says. “Of course, that's not what we want from directed energy weapons. We want deep magazines. We want to be able to handle wave attacks as favorably or more favorably that kinetic weapons.”

The “rule of thumb” for a high-energy laser is an efficiency of about one-third, meaning a 300-kW generator is necessary to create a 100-kW laser beam, resulting in 200 kW of waste heat that must be dealt with in some way, says Frank Peterkin, a senior technologist on directed energy for the U.S. Navy who spoke at the same event. On Navy ships, that puts the laser in competition with the electronic warfare and radar subsystems for power and thermal management loads, he adds.

“The challenge for the directed energy community is we don't really own the solution,” Peterkin says. “It does need to be a more holistic solution for the Navy. We are a customer, but we're not driving the solution, per se.”

Although directed energy researchers cannot design the power grids for bases, ships and aircraft, they can help the requirement in other ways, says Lawrence Grimes, director of the Directed Energy Joint Transition Office within the Defense, Research and Engineering directorate of the Office of the Secretary of Defense.

The development of special amplifier diodes for fiber optic lasers are breaking the “rule of thumb” for high-energy systems, Grimes says. “They actually operate at higher temperatures and higher efficiency, so they can reduce the requirement necessary for the prime power and thermal management, and we're not throwing away 200 kW.”

Other Defense Department organizations are pursuing more ambitious options. The Strategic Capabilities Office is selecting suppliers to demonstrate small, 10 MW-size nuclear reactors, as a power generation option for directed energy weapons at austere forward operating bases.

Meanwhile, AFRL also is considering space-based power generation. Under the Space Solar Power Incremental Demonstrations and Research program, AFRL will investigate using high-efficiency solar cells on a spacecraft to absorb the solar energy. The spacecraft then would convert the solar energy into a radio frequency transmission and beam it to a base to supply energy. AFRL has awarded Northrop Grumman a $100 million contract to begin developing the technology.

If those seem like long-term options, the Air Force is not immediately concerned. The HEL-WS and THOR are designed to use “wall-plug” power or the military's standard electric generators, Hammett says.

https://aviationweek.com/defense/era-laser-weapons-dawns-tech-challenges-remain

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  • xTechSearch: Army Picks Top 10 Tech Innovators

    23 mars 2020 | International, Aérospatial, Naval, Terrestre, C4ISR, Sécurité

    xTechSearch: Army Picks Top 10 Tech Innovators

    From throwable cameras to magnetic brakes, from disease prevention to battlefield networks, these small businesses have technologies the Army really wants. Read on to find out why. By SYDNEY J. FREEDBERG JR. WASHINGTON: Miniaturized electromechanical compasses so you can still find your way when the enemy's jammed GPS. 360 degree cameras you can throw into a building before you storm it. 60-minute screening for pathogens like COVID-19. Those are just three of the winning ideas in the latest round of the Army's Expeditionary Technology Search program, the service's push to get high tech out of small biz. This week, 20 small businesses made their pitches to a panel of Army judges — and in a suitably 21st century touch, it was all done via the web, since the AUSA Huntsville conference where the pitches were originally to take place was canceled because of the coronavirus. (Click here for all our virtual and surrogate AUSA coverage). Yesterday, in a brief webcast, xTechSearch program manager Zeke Topolosky read out the 10 semifinal winners, who'll receive $120,000 each and – even more important for many of the competitors – access to Army expert mentors to help refine their pitch and their product for military use. One final winner will be picked to receive $250,000 this fall, hopefully at AUSA's grand annual meeting in October if the coronavirus permits. Topolosky spoke to me at length by phone after the announcement. What follows, in his own words (edited for brevity and clarity), is what excited the Army about each of the 10 winners. Zeke Topolosky, Program Manager, Army xTechSearch: It's 20 semifinalists that presented the last two days. This is a selection of all of the top technologies from all of the different technology areas. All that is evaluated by 28 judges over the past two days, from all different fields, very senior technical experts, acquisition experts, end users, and soldiers. We had to come to a consensus agreement on the ten that would move on to the finals. Bounce Imaging, they've made a tactical throwable camera, but it's not just throwable. It can be used mounted on a canine, on a person, on a vehicle, and it gives you a complete 360 degree spherical view. They're working on this in both color and IR [infrared]. And they were working on continuing to miniaturize that technology. And it stabilizes at all times. Imagine a body-worn camera [on someone] running through a building: You can't really follow that video. This device kept the video always oriented in one direction that the users requested, and stabilized, at all times. So it really had a lot of immediate use in things like breaching buildings, subterranean investigation, where they could just toss this into a building and get complete 360 degree situational awareness, day and night. GeneCapture, a very strong company, lots of amazing expertise on their staff. Obviously, they made some references to coronavirus [testing]. What they can do is detect infections and pathogens from a deployable, portable system, and do it rapidly. They have the ability to test for multiple things at once. Most detection systems like this, they're testing for one pathogen at a time, and it has to be done in a laboratory. They were pitching the ability to do this downrange, and to test for multiple things. When you have a soldier downrange, not in a hospital or in a medical station, who may have some illness, you have to sort of guess on treating them, or not treat them at all till they get proper testing, which could lead to administering the wrong medication, or no medication. This would allow a field medic to do those tests, real time, and know exactly what they're dealing with. Inductive Ventures. This is a magnetic braking technology. Now, this company pitched numerous use cases for magnetic brakes versus the carbon brakes that we normally use, but for the xTech competition, they focused on braking for helicopters. Right now, when you land a helicopter, you have no way of moving that machine without either turning on the engine or towing by other vehicles. With this technology, you would enable helicopter operators, if they were to land in an emergency, or have to move their vehicle without it fully functioning, they can do that with this magnetic braking. We did have several helicopter pilots in our judging panel who were saying, “This is revolutionary for us.” We even had an example of somebody having to do an emergency landing on a soccer field with a Huey overseas, due to mechanical failure. And then once they landed, they literally had no way of moving that helicopter. They left it. This would have enabled them to be able to move it around and work on it. IoT/AI, these guys kind of blew the socks off the judges. Essentially, they had a device that was hardened against cyber attacks and other interference. They're also able to do all this on an edge device, in this black box that you can take to the field, as opposed to having to send data back to a server. It's just one less vulnerability. Everything can be done there on the edge. It's kind of the golden nugget for deploying AI for the Army, where it's going to be done in forward deployed areas, without infrastructure, without these computing resources that are power draining, in vulnerable areas where the enemy is trying to mess them up. Deploying artificial intelligence in the Army is going to be way more difficult than all the things we see being developed on the commercial side, from self-driving cars to Alexa. Lots of people are developing algorithms, but we don't necessarily have the hardware to make that a reality for the Army, that's really sort of missing right now. IOT/AI, what they're providing is some of the hardware solutions to make that a reality. LynQ Technologies, this was a very strong company, it had strong VC backing, which de-risks a lot for the Army, and they've also been recognized by Techstars, out of the Air Force. It's a very mature product. There's a real near-term win with this, because it's a ready-to-go product that we could be using now to locate injured soldiers in the field, downed pilots, lost cargo, et cetera. It was a very strong company, well-backed on the commercial side. They clearly had a capability that they could deliver the Army now that we don't have. KeriCure – deployable wound care products. Like LynQ, this was a very mature product: You can go on Amazon and buy their product now. It was just a wonder why the Army doesn't have this in their kit. Field medics right now could be using this. Yes, there's some testing that would have to be done with to validate some of the claims, and there is possibly some more development work that has to go into packaging it better for field use. But it's a mature product that can give immediate, lifesaving capability to soldiers now. The Army deals with wounds that can't be dressed properly immediately, that lead to infections. And what this product does, it's a dressing you spray on wounds to prevent those infections from occurring. We had some combat medics in the group, and they all agreed they could use this in their kit right now. MEI Micro, it's a MEMS [Micro Electronic-Mechanical System] IMU [Inertial Measurement Unit]. It's an order of magnitude improvement on position, navigation, and timing capabilities that we have now. When you're GPS-denied, the solutions that are out there — including quantum clocks and gyro [gyroscopic] devices — are very expensive, and they're under development. What they presented showed a leap-ahead capability for a far lower cost. If it can be realized, it's a game changer here for assured position, navigation, and timing, which helps you with things like communications, navigation, et cetera, especially in a congested or a GPS-denied environment. Multiscale Systems, this is a company that competed in a previous round of xTech, when they were a little less mature. They had a meta-material, an engineered material, so you could customize the properties of the material and how you build it. They're able to make materials for air traffic, cargo, and even lining truck beds, much lighter, much stronger than what we currently have, and for cheaper. With the Army where, especially in logistics and transportation, they can have an immediate impact and save a lot of money and a lot of weight, especially when airdropping cargo and containers and things like that. Beyond that, there just seems to be a lot of other applications for these materials. Granted, they will need some work in lowering the cost to produce them, but the product itself could be a huge cost savings for the Army and lighten the load a lot in aircraft and ground logistics platforms. Novaa, that's the next generation SATCOM [satellite communications]. What these guys are proposing is a brand-new way of handling the spectrum. In the Army, we are constantly having to tap into multiple frequencies, so you'll see vehicles, aircraft driving around with lots of antennas on them. If you're on SATCOM, if you have a radar system, if you're doing high frequency, ultra-high frequency, everything requires a different physical antenna — and all of these antennas take up space. Not only that, they stick out, they get snagged, get caught, these antennas break. And worst of all, they are targets. They're highly visible. They stick out like a sore thumb, and they let the enemy know, hey, this is a vehicle of importance, it's got communication gear or sensor gear. What they are offering is an antenna designed to replace all those antennas with one single aperture, with a very low profile. The space savings, the drag savings, and the concealed nature of it, on top of having the complexity and the cost of all these antennas replaced with just one, was very appealing. It was the antenna design, but it was the architecture that goes with it as well, to be able to handle from one aperture, all these other systems that have to tap into that antenna. Really a potentially revolutionary way of approaching the spectrum. Vita Inclinata is the last one. This is another repeat company, they had previously been in the competition and had come back. They make a stabilization system for helicopters that are hoisting up either cargo or gurneys with injured people on them. This is a huge problem in the rescue operations, where a little gust or just the wrong movement can cause a load to spin out of control. There's instances where the Army is dropping expensive cargo because it would bring down the helicopter when they get into a spin, even losing injured people that are being medevac'ed because of these spins. Even rigging these hoist systems is extremely dangerous and requires somebody on the ground. Vita Inclinata, they've developed fully autonomous solution that completely stabilizes any loads, from just a wounded person to tens of thousands of pounds of cargo. They have a ready-to-go, pretty well tested device that could be added on to any helicopter. Since last year, their company has progressed a lot, with lots of interest across the services and the commercial side, landed some good investments and contracts. And this time around, they really understood where the niche was, where the Army needed this the most. Last year, they were trying to talk to the Future Vertical Lift folks about, “your new aircraft could use this.” But it's really all the helicopters, especially the existing ones that we're using now. The Army does not have this capability and it's desperately needed. https://breakingdefense.com/2020/03/xtechsearch-army-picks-top-10-tech-innovators

  • Indra strengthens the spanish air defence system

    29 mai 2020 | International, Aérospatial

    Indra strengthens the spanish air defence system

    Spain, May 27, 2020 - The Ministry of Defence has awarded Indra the tender for the IFF (identification, friend or foe) systems modernization for Lanza 3D radars used by the Aerial Surveillance Squadrons of the Spanish Air Force. With this upgrade, the systems will comply with the most recent NATO interoperability standards, which will soon be mandatory for military aircraft and ground systems. These are systems capable of interrogating an aircraft over 470 kilometers away to identify it and determine whether or not it is a threat. The Spanish Air Force will have the following interrogation capabilities throughout the national territory: Mode 5 (encrypted), Mode S and ADS-B. All these identification methods will be incorporated into the different air command and control centers that protect Spanish air space and Europe's southwestern flank within NATO. The new equipment supplied by Indra will be set up for security accreditation and will be resistant to cyber attacks. They will offer reinforced protection for the data exchanged with civil air traffic control entities. The contract has a duration of 3 and a half years, and comes with the associated logistic support in the Air Surveillance Squadrons (EVA, in Spanish) as well as in the Logistic Transmissions Center (CLOTRA, in Spanish). This ensures that the systems will be operational throughout their life cycle of at least 15 years. Indra is one of the leading companies worldwide in the development of IFF systems that it has implemented in ground stations as well as in platforms of all types. Indra is a leading company in radar development and one of the main suppliers for NATO. The company has won all the radar tenders awarded by the Alliance in the last five years and has delivered a total of more than 50 Lanza 3D radars to countries on all five continents. Its equipment has been extensively tested in all kinds of scenarios and environments. Indra is also experienced in the supply of complete air defence systems that protect the air space of several countries. About Indra Indra (www.indracompany.com) is one of the leading global technology and consulting companies and the technological partner for core business operations of its customers world-wide. It is a world-leader in providing proprietary solutions in specific segments in Transport and Defense markets, and a leading firm in Digital Transformation Consultancy and Information Technologies in Spain and Latin America through its affiliate Minsait. Its business model is based on a comprehensive range of proprietary products, with a high-value focus and with a high innovation component. In the 2019 financial year, Indra achieved revenue of €3,204 billion, with more than 49,000 employees, a local presence in 46 countries and business operations in over 140 countries. View source version on Indra: https://www.indracompany.com/en/noticia/indra-strengthens-spanish-air-defence-system

  • USAF Errantly Reveals Research On ICBM-Range Hypersonic Glide Vehicle

    19 août 2020 | International, Terrestre

    USAF Errantly Reveals Research On ICBM-Range Hypersonic Glide Vehicle

    Steve Trimble The U.S. Air Force agency that manages the service's nuclear arsenal has started researching enabling technology for an intercontinental-range, hypersonic glide vehicle (HGV), according to a document that was published briefly in error on a public website. Although the document shows a U.S. nuclear weapons agency is researching HGV technology, senior Pentagon officials say there has been no change to a policy that “strictly” limits the emerging class of hypersonic gliders and cruise missiles to non-nuclear warheads. A request for information (RFI) published on Aug. 12 by the Air Force Nuclear Weapons Center asks companies to submit ideas across seven categories of potential upgrades for intercontinental ballistic missiles (ICBMs) designed with a “modular open architecture.” The Air Force often describes the future Ground Based Strategic Deterrent ICBM as featuring a “modular systems architecture,” in contrast with the aging Minuteman III, which does not. Among the seven items on the upgrade list, the Air Force called for a new “thermal protection system that can support [a] hypersonic glide to ICBM ranges,” according to the RFI, which is no longer publicly available on the government's procurement website. The RFI appears to have disclosed information that was not meant by the Air Force's nuclear weapons buyers to be made public. Each of the seven items listed in the RFI's “scope of effort” for ICBM upgrades included a prefix designation of “U/FOUO,” a military marking for information that is unclassified, but for official-use only. Although not technically a classified secret, information marked as “FOUO” usually is withheld from the public. The RFI was removed from beta.sam.gov on Aug. 17 after Aviation Week inquired about the document with the Air Force and the Office of the Secretary of Defense (OSD). The Defense Department (DOD) has three different operational prototypes for HGVs in development now: the Air Force's AGM-183A Air-Launched Rapid Response Weapon, the Army's Long Range Hypersonic Weapon and the Navy's Intermediate Range Conventional Prompt Strike. Once fired from an aircraft, ground-launcher or submarine, all three are designed to strike targets with conventional warheads at intermediate range, which is defined as 1,500-3,000 nm by the official DOD Dictionary of Military and Associated Terms. But the Pentagon has no acknowledged plan to develop an HGV with a range beyond 3,000 nm and maintains a policy that “strictly” prohibits arming any such weapon—regardless of range—with nuclear warheads. The two-most senior staffers leading the hypersonic weapons portfolio reiterated that policy during a press conference on March 2. “Our entire hypersonic portfolio is based on delivering conventional warheads,” said Mike White, assistant director of defense research and engineering for hypersonic weapons. “Right,” agreed Mark Lewis, the director of defense research and engineering for modernization programs. “Strictly conventional.” The Pentagon has not changed the policy since March 2, said Lt. Col. Robert Carver, a spokesman for Lewis' office. “DOD is not developing nuclear-capable hypersonic weapons,” Carver said in an email. “There are common technology needs between the nuclear enterprise and hypersonic systems. Particularly in the area of high-temperature materials, we typically collaborate on the development of advanced dual-use materials technology. I will reiterate that our entire hypersonic program portfolio continues to be based on delivering conventional effects only.” Although the DOD upholds the conventional-only policy for hypersonic gliders and scramjet-powered cruise missiles, the source of the RFI raises questions, said James Acton, co-director of the Nuclear Policy Program at the Carnegie Endowment for International Peace. “The fact that [this RFI] is coming from the nuclear weapons center, it makes it sound an awful lot like this would at least be nuclear-armed or conceivably dual-capable,” Acton said. Although the RFI confirms research is underway, the DOD still has no acknowledged plan to proceed from basic research into the acquisition phase of an ICBM-range hypersonic glider, whether carrying a conventional or nuclear warhead. If the thermal-protection system technology is limited to research only, the RFI by the Air Force's nuclear weapons organization may not violate the DOD policy, which may apply only to fielded weapons. “DOD does a lot of research on a lot of different things and the vast majority of these programs never turn into an acquisition,” Acton said. “It could turn into something, but sophisticated observers recognize that it may not.” The DOD's conventional-only policy for maneuvering hypersonic weapons stands apart from other countries in the field. Russia, for example, has deployed the nuclear-armed Avangard HGV on the SS-19 ICBM. In February, the head of U.S. Northern Command, Gen. Terrence O'Shaughnessy, said in written testimony submitted to Congress that “China is testing a [nuclear-armed] intercontinental-range hypersonic glide vehicle, which is designed to fly at high speeds and low altitudes, complicating our ability to provide precise warning.” The DOD never has had an announced weapons development program for a conventional- or nuclear-armed, intercontinental-range HGV, but has experimented with air-launched gliders. The Hypersonic Test Vehicle-2 program by the DARPA attempted to demonstrate a range of 4,170 nm, but each experimental glider in two tests staged in 2010 and 2011 failed about 9 min. into a planned 30-min. hypersonic glide. The leading edges of an intercontinental-range HGV could be exposed to temperatures as high as 7,000K (6,726C) on reentry, then endure a prolonged glide phase compared to an intermediate-range system, said Christopher Combs, who researches hypersonic aerodynamics as an assistant professor at the University of Texas-San Antonio. “The bottom line is it's just crazy temperatures,” Combs said. “They're still not dealing with space shuttle or Apollo [capsule] temperatures, but it's still really hot.” The rescinded RFI, meanwhile, also may provide a rare glimpse into the Air Force's plans for the new ICBM developed under the Ground Based Strategic Deterrent (GBSD) program. Apart from the thermal-protection system for a hypersonic glider, the scope of effort in the RFI sought industry input on a variety of topics, including: • Fusing data from lower-fidelity, onboard sensors to improve guidance, navigation and control. • New navigation aids to correct inertial measurement unit drift on long-time-of-flight missions. • A lighter, smaller and more efficient “future fuze,” which also could “accept inputs from external subsystems.” • Radiation-hardening techniques for advanced microelectronics, such as a system on a chip or system in a package. • Improved computer hardware and software, including artificial intelligence algorithms. • A more secure architecture and better security sensors for ICBM ground facilities. The Air Force plans to award the contract to Northrop Grumman by the end of the month to launch the engineering and manufacturing development contract for the GBSD program. Northrop remained the sole bidder for the program to deliver more than 600 new ICBMs to the Air Force after a Boeing-led team withdrew from the competition last year. https://aviationweek.com/defense-space/missile-defense-weapons/usaf-errantly-reveals-research-icbm-range-hypersonic-glide

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