Lennokkien torjunta


Norwegian ammunition company Nammo has come up with a solution to the anti-drone predicament. The company’s answer is to develop 40x53mm high-velocity grenades using programmable components that allow soldiers to lase the distance to an enemy UAV, transmit that data into the grenade, which then programs that grenade to airburst at that particular altitude. Using bursts to maximize the effectiveness of the explosions around a drone, the likelihood of taking it out of commission can increase, given an accurate distance program is used.

This technology would have been very difficult to fit in a 40x46mm low-velocity grenade typically fired from hand-held grenade launchers or UBGLs due to the size and the lack of range with most of these designs (Max effective 400 meters). However with an automatic grenade launcher, the max effective is pushed out to 1,500 meters (Mark 19), and there is more space to fit the explosive charge as well as the timing mechanism. It is very similar to the 25mm XM25 Punisher that was canned several years back.
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http://www.thefirearmblog.com/blog/...-anti-drone-programmable-airburst-ammunition/
 
Kuinkahan vaikeaa olisi asentaa 40mm Bofors Pyökkiin?
 
Pyökki = Buk

Silti en ymmärrä.
 
Benelli kirjoitti:
Lämpökamera ja tutka lienevät riittäviä lennokin havaitsemiseen ja korkeuden, etäisyyden että nopeuden laskemiseen ja ohjusten paino on yli kaksi ja puoli tonnia eli lavetissa lienee tarpeeksi kantokykyä tykille.
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Bukista on luovuttu. Korvaaja on Nasams.

Maailmalla on kyllä it-järjestelmiä, joissa tykit ja ohjukset.

Esimerkiksi
https://en.wikipedia.org/wiki/Pantsir-S1
 
Mjk5NDg4NA.jpeg


The incredible videos of anti-drone eagles snatching DJI Phantoms out of the sky on command was one of the coolest drone things we’ve seen in a while (if you’re worried, the eagles weren’t harmed, at least according to the bird experts hired by the Dutch police). But it seems that that program has been terminated.

Although birds of prey are trainable, to some extent, and they’re naturally predisposed to grab things out of the air, using them to take out drones is very time-consuming, and according to recent news reports, the Dutch Police had some concerns about how reliably the birds would perform in an operational environment, in the midst of noisy crowds, and against drones that might behave adversarially rather than just hover. (The company helping the Dutch with its drone-hunting eagle program says they have other “international clients in the Defense and Law enforcement Industry.”)

Perhaps more significant, there just wasn’t a lot of demand for the anti-drone eagle squad. Rogue drones haven’t been as much of a problem as predicted, and there are lots of other ways of dealing with them that don’t involve having to buy frozen rodents in bulk. As for the Dutch eagles, they have been taken to new homes, and we’re guessing that their new lives will be a bit more relaxing for them.
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https://spectrum.ieee.org/automaton...stration-is-back-in-a-not-fun-week-for-drones
 

If a drone-creeper is snooping on you, you could catch them by grabbing the video stream – but what if it's encrypted?


Even then, detection turns out to be pretty straightforward: as researchers from Ben-Gurion University of the Negev and the Weizmann Institute of Science explain, you don't need to decrypt the stream at all, you just need to apply a stimulus you control.


Their approach, revealed here and published in detail at arXiv, detects how video bitrate changes given a particular stimulus.


In other words, it's a particular kind of side-channel attack – which is no surprise, since the researchers in question have applied their skills to side-channel attacks for years.


In the new paper they write: “we demonstrate how an interceptor can perform a side-channel attack to detect whether a target is being streamed by analysing the encrypted FPV channel that is transmitted from a real drone (DJI Mavic) in two use cases: when the target is a private house and when the target is a subject.”


Researcher Ben Nassi, a student of BGU professor Yuval Elovici, said: "The beauty of this research is that someone using only a laptop and an object that flickers can detect if someone is using a drone to spy on them ... While it has been possible to detect a drone, now someone can also tell if it is recording a video of your location or something else".


As demonstrated in the video below, the interception takes advantage of how video encoding algorithms work: if nothing changes in an image between frames, the codec doesn't need to re-sent redundant information.
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Linkki
 
The scientists noted that the U.S. military has invested significant resources into counter-drone technologies, often focusing on detecting radio signals from a drone or its operator and jamming the radio link between them. However, the researchers noted that modern drones can increasingly operate without radio links, instead relying on automated systems for target recognition and tracking as well as obstacle avoidance.

The report also indicates that, by 2025, hobby drones could operate in swarms of tens to hundreds of aircraft—much sooner than the U.S. Army might have anticipated. Countering such drone swarms will likely prove to be a difficult challenge; researchers will have to find ways to detect, identify, and track numerous targets simultaneously instead of single drones. “America has done a lot of research with [deploying] swarms, but other nations are now advertising they have swarms as well,” Sciarretta says.

Much of the study's findings are classified. “The Army and all the services are looking for ways to counter multiple numbers of sUASs, but I can't tell you what we recommended,” Sciarretta says.

What the study does make clear is that most counter-sUAS systems are too bulky, heavy, and power hungry for infantry personnel to carry; they’re even too much for the lightly armored vehicles most vulnerable to sUAS attacks. “Dismounted infantry are already overburdened, so any counter-sUAS systems we give them has to take that into account,” Sciarretta says.

The report’s public version also notes that the time horizon on which the U.S. Army says it will combat the problem is too drawn out to deal with the rapid advances in the level of threat posed by sUASs. “The U.S. Army's timeframe of near-term is from now to 2025; mid-term, from 2026 to 2035; and far-term, from 2036 to 2050,” Sciarretta says.

Instead, the committee behind the study proposes much more accelerated timeframes for sUAS and counter-sUAS research. “It should be more like, immediate, from today to 2019; imminent, from 2020 to 2022, and emerging, from 2023 to 2025,” Sciarretta says.
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https://spectrum.ieee.org/tech-talk/aerospace/military/us-military-evaluates-antidrone-tech
 
Benelli kirjoitti:
Lämpökamera ja tutka lienevät riittäviä lennokin havaitsemiseen ja korkeuden, etäisyyden että nopeuden laskemiseen ja ohjusten paino on yli kaksi ja puoli tonnia eli lavetissa lienee tarpeeksi kantokykyä tykille.
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Tuollainen projekti olisi erittäin todennäköisesti taloudellisesti -EV seuraavista syistä:

1. Tela-alusta ja sen huollettavuus.
2. Venäläinen elektroniikka ja sen häirinnänsieto sekä huollettavuus.
3. Kehityskulut jakautuisivat yhdeksän TELAR:n kesken, eli ei skaalaetuja.
 
Talvela kirjoitti:
Kuinka Sergein modattu malli toimii lennokkeja vastaan?
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Sitä voi mahdollisesti käyttää yöllä. "Mahdollisesti, koska en tiedä näkisikö se IP-kamera sen lennokin tai miten kaukaa. Sitten tulee vielä kysymys, että saako siitä lennokista mitattua etäisyyden, jotta laskin saa jotakin minkä perusteella toimia. Sen jälkeen sillä on edelleen ne samat ongelmat osumisessa siihen lennokkiin mitä vanhassa mallissa.
 
PSS kirjoitti:
Ok.
En löytänyt julkisia lähteitä modernisoitujen Sergeiden ominaisuuksille, joten... Tietyistä syistä en voi jatkaa pohdiskelua. :censored: Sori (ei siis mitään henkilökohtaista.)
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Lyhyesti: Sama kuin ennen mutta nyt myös pimeässä. Asemiinajo ja käyttökuntoonlaitto hitaampi kuin vanhalla, joten soveltuvat paremmin kiinteiden kohteiden suojaamiseen.
 
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