29 août 2018 | International, C4ISR
By: Kelsey Atherton
The ocean hides what it contains, and it is in that hiding that submarines have their power. Lurking under seas, at first with just enough capability for an attack run and now with the ability to lurk for months at a time, submarines remain power out of reach, unseen until engaged in combat or resupplying in a friendly port. That stealth comes at a cost, however, besides the simple perils of existing underwater.
When submerged, submarines are more or less on their own until they resurface again, since radio waves do not travel well through seawater. Or they are for now. New research by MIT, presented at a conference in late August, devised a way for submerged submarines to communicate wirelessly with people on the surface by combining hydroacoustics and acoustic radars.
Presently, submarines communicate either across normal radio frequencies when surfaced or through hydroacoustic signals and listening posts underwater that can transmit the messages back to counterparts on shore. Very and extremely low-frequency radio waves can be transmitted in a way that submarines can listen to below the surface, but it's a one-way form of communication, from stations on land to submarines. To get something responsive, with the flexibility to communicate away from static seabed hydrophones, needs something else.
Specifically, it needs a way to combine hydroacoustic transmission from the submarine through water that can then be converted into a useful data.
“We present a new communication technology, translational acoustic-RF communication (TARF),” write paper authors Francesco Tonolini and Fadel Adib of the MIT Media Lab.
“TARF enables underwater nodes to directly communicate with airborne nodes by transmitting standard acoustic signals. TARF exploits the fact that underwater acoustic signals travel as pressure waves, and that these waves cause displacements of the water surface when they impinge on the water-air boundary. To decode the transmitted signals, TARF leverages an airborne radar which measures and decodes these surface displacements.”
In testing, they demonstrated that the communication technique can transfer data at standard underwater bitrates up to 400bps, and even do so with surface waves 6.3 inches crest-to-crest, or 100,000 times larger than the surface perturbations made by the acoustic transmitter.
Right now, this communication is one-way. While the signal transmitted up from the water produces useful information at the boundary with the air, a signal transmitted through the air downwards would disintegrate on integration with water. This one-way is distinct from previous forms of communication with submarines, however, as it lets the submarine talk without revealing its position to surface sensors.
Despite the limitations, and the earlierness of the research, Tonolini and Adlib see a bright future for the technology, as a way to enable a host of new technology in machines. The technology, they write, can enable “many applications including submarine-to-drone communication, deep-sea exploration, and subsea IoT (Internet of Things).
https://www.c4isrnet.com/c2-comms/2018/08/28/mit-discovers-way-for-submarines-to-talk-to-drones
5 avril 2023 | International, Aérospatial
The aircraft support contract is valued at approximately ?147M and will ensure and enhance the UK F-35 fleet?s availability and capability to conduct combat missions worldwide
26 mars 2024 | International, Terrestre
The contract will be performed over a period of ten years.
4 septembre 2018 | International, Terrestre, C4ISR
By: Kelsey Atherton Drones are everywhere in the Pentagon today. While unpeopled vehicles are most closely associated with the Air Force and targeted killing campaigns, remotely controlled robots are in every branch of the military and used across all combatant commands. The fiscal year 2018 defense authorization contained the largest budget for drones and robots across the services ever, a sign of just how much of modern warfare involves these machines. Which is perhaps why, when the Department of Defense released its latest roadmap for unmanned systems, the map came in at a punchy 60 pages, far shy of the 160-page tome released in 2013. This is a document less about a military imagining a future of flying robots and more about managing a present that includes them. The normalization of battlefield robots Promised since at least spring 2017, the new roadmap focuses on interoperability, autonomy, network security and human-machine collaboration. The future of drones, and of unpeopled ground vehicles or water vehicles, is as tools that anyone can use, that can do most of what is asked of them on their own, that communicate without giving away the information they are sharing, and that will work to make the humans using the machines function as more-than-human. This is about a normalization of battlefield robots, the same way that mechanized warfare moved from a theoretical approach to the standard style of fighting by nations a few generations ago. Network security isn't as flashy a highlight as “unprecedented battlefield surveillance by flying robot,” but it's part of making sure that those flying cameras don't, say, transmit easily intercepted data over an open channel. “Future warfare will hinge on critical and efficient interactions between war-fighting systems,” states the roadmap. “This interoperable foundation will transmit timely information between information gatherers, decision makers, planners and war fighters.” A network is nothing without its nodes, and the nodes that need to be interoperable here are a vast web of sensors and weapons, distributed among people and machines, that will have to work in concert in order to be worth the networking at all. The very nature of war trends toward pulling apart networks, toward isolation. Those nodes each become a point at which a network can be broken, unless they are redundant or autonomous. Where will the lethal decision lie? Nestled in the section on autonomy, the other signpost feature of the Pentagon's roadmap, is a small chart about the way forward. In that chart is a little box labeled “weaponization,” and in that box it says the near-term goals are DoD strategy assessment and lethal autonomous weapon systems assessment. Lethal autonomous weapon systems are of such international concern that there is a meeting of state dignitaries and humanitarian officials in Geneva happening at the exact moment this roadmap was released. That intergovernmental body is hoping to decide whether or not militaries will develop robots that can kill of their own volition, according to however they've been programmed. The Pentagon, at least in the roadmap, seems content to wait for its own assessment and the verdict of the international community before developing thinking weapons. Hedging on this, the same chart lists “Armed Wingman/Teammate (Human decision to engage)” as the goal for somewhere between 2029 and 2042. “Unmanned systems with integrated AI, acting as a wingman or teammate with lethal armament could perform the vast majority of the actions associated with target identification,tracking, threat prioritization, and post-attack assessment," reads the report. "This level of automation will alleviate the human operator of task-level activities associated with the engagement of a target, allowing the operator to focus on the identified threat and the decision to engage.” The roadmap sketches out a vision of future war that hands off many decisions to autonomous machines, everything from detection to targeting, then loops the lethal decision back to a human responsible for making the call on whether or not the robot should use its weapons on the targets it selected. Humans as battlefield bot-shepards, guiding autonomous machines into combat and signing off on the exact attacks, is a possible future for robots in war, one that likely skirts within the boundaries of still-unsettled international law. Like its predecessor, this drone roadmap is plotting a rough path through newly charted territory. While it leans heavily on the lessons of the present, the roadmap doesn't attempt to answer on its own the biggest questions of what robots will be doing on the battlefields of tomorrow. That is, fundamentally, a political question, and one that much of the American public itself doesn't yet have strong feelings about. https://www.c4isrnet.com/unmanned/2018/08/31/new-military-drone-roadmap-ambivalent-on-killer-robots