To form the sparse array antenna, the robots arrange themselves at roughly equal intervals

Wednesday, May 8th, 2024

Several drones working together can act as a single large radar dish, David Hambling explains (in Swarm Troopers), an arrangement known as a “sparse antenna array”:

The emissions from several drones are combined together into a single signal in a process called beamforming.

[…]

To form the sparse array antenna, the robots arrange themselves at roughly equal intervals, generally in a line or a circle. One robot acts as master and has software that takes information about the signal at each of the antennas — specifically the amplitude, phase, and delay — and combines this information to get an enhanced signal. There is little extra hardware needed as the system exists almost entirely in software, so any of the drones can be the master.

[…]

In a process known as nulling, the jammer signal is detected and located from its influence at different points, then completely cancelled out.

“I showed that we could completely ignore the effect of a jammer, positioned between the transmitter and receiver, that was twenty-three decibels above the desired transmitted signal,” says Okamoto.

Twenty-three decibels means the jammer is transmitting noise two hundred times as powerful as the source signal. It is like being able to hear a distant whisper while someone is bellowing in your ear.

[…]

In addition, Kocaman’s paper demonstrates how ten drones could act together and use “distributed beamforming,” like Kitts’ formation robots, to achieve more than a simple addition of their power would suggest. Kocaman calculates ten of these drones could jam a Russian Sam-2 Fan Song anti-aircraft radar, producing too much radio noise for the radar to “burn through.” This would render it helpless – the drones could broadcast the radar’s exact location with impunity, and even “lase” it with a designator, making the radar a sitting duck for an air strike.

[…]

A swarm that combined jammers with “flying IED” would be able to overwhelm a ship comparatively easily. If it attacked at night, even the last-ditch machine-guns would be lucky to score any hits.

[…]

Its ability to act as a giant antenna means it could carry out stealthy electronic eavesdropping over a wide area.

Posted in Technology | No Comments »

Gaikokumaniakku: Possibly relevant: https://www.yahoo.com/ne ws/britain-says-developi ng-radio-wave-132346318. html
Gaikokumaniakku: Possibly relevant: https://www.laserfocuswo rld.com/lasers-sources/a rticle/14211951/testing- 50-kw-lasers-in-weapon-s ystems I did a few searches trying to find good news about long-range electrolasers, but I only found short-range devices suitable for clearing IEDs.
Shadeburst: The three thousand feet sounds highly suspect. A formation of WW2 Forts would drop all its bombs simultaneously on a signal from the lead bombardier. As the formation was spread out across the sky, side- as well as long-ways, and the bombs were released over a period of a few seconds (during which time the formation had traveled a thousand feet) the intention was to bomb an area, not a pickle-barrel pinpoint. In addition, Europe being Europe, the target might often be obscured by cloud, in...
Gaikokumaniakku: Also, the cars may or may not be well-designed but the charging stations apparently were designed to be convenient for copper thieves.
Gaikokumaniakku: “Musk, in contrast, spent more time walking assembly lines than he did walking around the design studio. ‘The brain strain of designing the car is tiny compared to the brain strain of designing the factory,’ he says.” I have heard rumors that Tesla cars cannot survive car washes or mud puddles unless they are first put into “car wash mode.” If such rumors are true, maybe the factory is well-designed but the car is badly designed.
M. Mack: Elon sounds pretty “Old School,” like Henry Ford and his right hand man “Cast Iron” Charlie Sorensen. Between them, they defined the auto industry, with the moving assembly line, one worker doing one task, and setting up the River Rouge plant to be vertically integrated, from the iron ore being turned into steel and iron in blast furnaces on site all the way to the cars rolling off the end of the line, and close to every step in between.
Elmer: Few decades back Marlin made the Supergoose, a 10-gauge bolt action shotgun with a 36-inch extra full choke barrel, took 3 1/2 inch 10-gauge shells, had a 2-round box magazine. Heavy, ugly, slow rate of fire unless you knew how to run a bolt gun, but it brought down geese at distances a 12-gauge could only dream about. Might be pretty good against drones. About the same time Ithaca made a 10 gauge 3 round semi-auto shotgun, also took 3 1/2 unch shells; IIRC, a 32 inch full choke barrel was...
Phileas Frogg: Blanket censorship of internal criticisms and critiques, without respect to their efficacy, is a sure sign of a social group lacking the internal social flexibility to withstand a serious external threat to their cohesion. The only thing keeping them together is the static nature of their circumstances; change that and there is a high likelihood of failure. Such a group is ossified and ready to break. I hesitate to put a number on it, but I’m willing to wager that a shockingly small...
Lu An Li: For McChuck and thank you. Makes sense. Unity of command.
McChuck: Just as there can only be one king, and army may only have a single commander. Command, by its very nature, rests upon a single head. Two commanders will constantly butt heads, confusing the troops and adding to the natural chaos of war. They often end up fighting each other more than the enemy. Even if they have the best of intentions, two commanders will inadvertently misdirect each others’ troops and interfere with each others’ plans.
Lucklucky: Maybe bad translation. But i think it means it is better to have 1 good and 1 bad than 2 good to be able to choose.
Lu An Li: “I believe it would be better to have one bad general than to have two good ones.” Someone explain this to me.
Gaikokumaniakku: After the lemur bites the millipede, it sprays its toxic secretion, which the lemur then rubs all over its fur. Research suggests that there is a practical purpose to this: the benzoquinone secretion functions as a natural pesticide and wards off malaria-carrying mosquitos. The secretion also acts as a narcotic, which causes the lemur to salivate profusely and enter a state of intoxication.
Freddo: If you want to reach the mass market you need an equally sized megaphone (or a lot of luck). A push by Oprah will do it, Joe Rogan probably to a lesser extend. Amazons algorithm and star rating have been wokified to the point of uselessness; goodreads fast approaching the same point. Aspiring writers get the advice to build their own internet presence, but that of course is a lot of work by itself. I like the concept of a book bomb where a group of like-minded authors do a push of a new novel.
Felix: And, no mention of romance novels. Aren’t they supposed to be 50% or better of books sold? Sure, there are big name romance writers. A lot of them, if the grocery store is indicative. But. No mention?
Felix: Jim, what are the important, unread books you have in mind?
Albion: As someone who has published a couple of books (independently) on-line I can testify no one reads them much. In a way not a problem as it was more of a hobby, and there is a certain pleasure in getting words down in roughly the right order. But in terms of return for effort, it is barely a penny an hour in all likelihood. As they say, don’t give up the day job. Equally I can go to a library or bookshop, and while there tens of thousands of books available, I know I don’t want to read...
Phileas_Frogg: Jim, Your comment is obviously true, and yet the religion of those Ellis Islanders has managed to intellectually persevere, and indeed dominate, in intellectually rigorous fields, and in particular at the most intellectually rarified branch of the government (SCOTUS is 6 Catholics, 2 Protestants, 1 Jew). It is an odd paradox. I suspect we’re seeing a selection process take place where the less intelligent, curious, and literate Catholics are ending up non-Catholic, while the more...
Jim: Pre-World Wars America was so much more literate than now that it may as well have been another planet. Nor has the displacement of Americans by the descendants of Ellis Islanders helped much.
Jim: No one buys books because no one reads books. There are books of great importance that practically no one has had access to for dozens or hundreds of years now available for free on the Internet Archive, and they have been “viewed” only a handful of times, let alone read. It would be comical were it not so tragic.

Isegoria

To form the sparse array antenna, the robots arrange themselves at roughly equal intervals

Leave a Reply

Search

Recent Comments

Categories

Archives