Dumpster fire thread

Discussion in 'General Chat' started by HippoCrushEverything, Jan 8, 2017.

  1. The Arrow 3 is now operational. Apparently, it could intercept satellites if it wanted to.
    HippoCrushEverything likes this.
  2. Grade A bad ass. I'd give him honorary Freedom status.

    You would think with lasers more powerful and portable, they would start up the Stars Wars project again. Assuming they cancelled it like they claimed.
  3. lasers are trash
  4. I know you are but what am I?
  5. Galileo satellite navigation system also became operational in late 2016. Plz don't shoot those satellites. Very good news for commercial aviation. No need for pseudolites, as in DGPS systems, and the USAF can't simply switch it off like it did switch off the GPS before the 1st Gulf War -> accurate and reliable enough to be used for landing.

    Saves a shit ton of money and resources because all those VOR/ADF/LORAN beacons and pseudolites don't need to be maintained, and landing in the shittier regions of the world suddenly becomes more convenient.
  6. Pseudolites will still be required for differential measurements in Galileo. Atmospheric diffraction still accounts for a greater circular uncertainty than selective availability ever did, such that the improved clock signal won't translate into improved measurments in practice without them.
  7. I have no idea what either of you just said.
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  8. #58 Vanilla Ice, Jan 21, 2017
    Last edited: Jan 21, 2017
    GPS satellites work by broadcasting the current time, very precisely. Without getting into the mechanics of how they work, there are several ways in which the quality of that time signal is degraded, two in particular being selective availability and atmospheric diffraction. GPS satellites are owned by the US Air Force, and the US military reserves the right to significantly degrade the civilian-available signal or completely disable it. Galileo is an alternative satellite navigation system that works on the same principles as GPS, but being three decades newer, has a much higher precision, and being owned by the ESA/EU, is not subject to selective availability (although ultra-precise services will still be encrypted, this is in order to collect user fees, not for military purposes).

    A second issue is diffraction. As a radio wave passes through the atmosphere, it will bend and slow. This behavior is not a static property, and is affected by the weather, temperature, precipitation, and so on. One solution to this issue is differential GPS. This is where one measures the relative position of two receivers, instead of their absolute position in space. If they are relatively close they are subject to the exact same weather conditions, and therefore have the same error. Their relative position is therefore much more accurate than their absolute position (eg: you may know the absolute location of a receiver ±5m, but the relative position of two receivers ±0.1m). If one receiver is then static, and surveyed precisely using more expensive means, you can now measure precise absolute positions with the second receiver, as you can reference the precise well-known location of the first. If such a static, surveyed receiver is made publically available, it is known as a pseudolite (like a pseudo-satellite). A pseudolite may also offer complete navigation services independent of the GPS system, for instance, near airports. Differential Galileo measurements are expected to have precisions on the order of 1cm error (comparable to survey-grade GPS, which is very expensive and takes a long time).
  9. Also, when the EU said it wanted to have its own satellite navigation system because it was worried the US would block GPS in a conflict, the USA responded in no uncertain terms that they'd shoot down the entire constellation if anyone used Galileo against them in a war. But now Israel can do that too.
    SEABEE likes this.
  10. The question is Merkel stupid enough to start a conflict with US allies or Israel?
  11. Of course. The problem with current GPS coarse acquisition signal is that it's not precise/reliable enough to be used for autoland without DGPS, but Galileo does provide this capability. Runways are generally wide enough to accommodate planes that are off by a few meters, but problems arise if the signal jumps by 100m.

    Galileo pseudolites are reserved for airfields where satellite coverage is poor due to terrain (f.ex. Innsbruck).
  12. Luckily the US did suggest that EU officials pick a different frequency band so they wouldn't have to resort to shooting down civilian satellites mostly funded by their NATO allies. The whole point was denying the enemy an area GNSS capability while retaining your own.
  13. [​IMG]
  14. Merkel and germany seem strange of late, pushing for an EU army, consorting with Erdogan, appointing former stasi to censor social media and restrictions on expression and speech that go beyond what is normal for western countries. She has probably killed the EU in the long term as well. Their international image is deteriorating somewhat at least outside of Europe.
  15. Those are some outrageous claims, do you have any sources? Afaik, Germany really takes freedom of speech and privacy of citizens seriously.

    An European military alliance was first proposed a few years after the WW2 so there's nothing new. EU has several non-NATO countries that share common defense goals. Current plans are for battalion-sized rapid reaction battlegroups, totaling ~60k in personnel. Not something that would be of importance in a major war, but something that would make a Crimea-move in a EU member state very difficult.

    Relative to population and size of economy, Germany remains one of the least heavily armed nations in the world, and you don't have to look very closely to see that the Bundeswehr is a purely defensive force, lacking all sorts of capabilities that even UK/France have.

    Merkel isn't the dictator of the European Union. Quite a few people you've probably never even heard of have way more influence in EU matters. And if the decision-making process of the EU displeases a member state, it can simply leave, just like the UK did.
  16. lasers are the future for space propulsion w/ solar kites
    SEABEE likes this.
  17. This is one of the former stasi known to be involved with social media censorship https://en.wikipedia.org/wiki/Anetta_Kahane . There has been a considerable number of political arrests, they always claim they are nazis but no one really knows how truthful it is. There's some reason to suspect former east german communist and stasi elements are up to something. They have the german media locked down fairly well, you have people being charged for insulting Erdogan. Then you have some infamous journalists at Bild that have been acting as full time propagandists for islamic terror groups in Syria. Given how easy it is to get in trouble for having illegal opinions it gives the impression the pro-terrorist journalists state sanctioned to some degree.
  18. This is legitimately insane.
  19. I think this was the only raid to make the news. http://www.ibtimes.co.uk/germany-60...r-discovery-neo-nazi-facebook-network-1570491 I'm a little skeptical there's enough nazis in modern germany to need simultaneous raids across 14 states, statements on what people are being arrested for are very nebulous and often equate opposition to the governments refugee policy with anti-semitism and nazis. From what I have heard it's still ongoing and some germans have resorted to using tor and vk.com, which quickly resulted in the government screaming it's all a Russian plot.

    Considering how easy it is to find german antifa calling for or planning violence online, islamists marching with ISIS flags and recruiting online it gives the appearance that these laws are primarily used against political opponents. It's difficult to know what is happening due to the language barrier, there's not really a large foreign media presence in germany. The german gov has a very tight grip on facebook, twitter and youtube at the moment so it's not really possible to discuss the issues on those websites if you're german.
  20. Um, I don't think Israel will be shooting any satellites down anytime soon. It's probably more of a Shahab 3, Scud and (large, far away) drone killer.
    Meanwhile we're having a hard time getting our own satellites up in the sky.
  21. what about the emdrive

    @Vanilla Ice
  22. HippoCrushEverything likes this.
  23. Oh hell eyeah

    Right up my alley
  24. #74 HippoCrushEverything, Jan 25, 2017
    Last edited: Jan 26, 2017

    Here's a Soviet ballistic missile early warning radar antenna of Duga-1 in Pripyat. The bigger antenna is 150m+ in height

    Such apocalypse, much wow



  25. oh god brutal

    love seeing those giant structures without a single consideration for form

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