chuck

@chuck@lemmy.ca

• ⁨Comment⁩ on ⁨xkcd #2867: DateTime⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  Ah I’ve gotten to the point where I have to define what “frame” and epoch each time base is in before I’ll touch the representation of time( Unix,Gregorian, etc) .To be honest I’m probably just scratching the surface of time problem.

  Hell probably the reason we haven’t seen time travellers is we suck at tracking time and you probably need to accurately know your time and place to a very good precision to travel to a given point and we can’t say where and when that is with enough accuracy to facilitate where to land. And people don’t want to land in the earth’s surface or 10000 km away from a stable orbit. Maybe some writer can build that out for a time travel book or to discount it for some reason lol

• ⁨Comment⁩ on ⁨Commercial Flights Are Experiencing 'Unthinkable' GPS Attacks and Nobody Knows What to Do⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  Yea then they just start shooting down everything randomly,

  And really want needs to be modified on the missiles? Sounds more like an airliner issue to me…

• ⁨Comment⁩ on ⁨Commercial Flights Are Experiencing 'Unthinkable' GPS Attacks and Nobody Knows What to Do⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  First Glonass is a mess, missing quite a few operational satellites Galileo is just ramping up.

  Interms of what is broadcast they still work on the same principle satellites broadcast time receiver does something like a linear least squares fit to estimate position, and time.

  Mixing all the sources and doing a linear least squares like fit means the bad guy has to spoof more signals, and this system will be more robust but it is susceptible to the same attack just ramped up a bit

• ⁨Comment⁩ on ⁨Commercial Flights Are Experiencing 'Unthinkable' GPS Attacks and Nobody Knows What to Do⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  Huh what do you propose then, go back to the 1960s and ensure they are only using VOR and DME ground equipment. There isn’t a check sum to check on GPS/GNSS it just a bunch of satellites broadcasting what they think is the correct time. If you jam those and replace them with signals close enough but wrong values you can trick the math that’s used inside the GPS/GNSS receiver that computes the the position (and velocity), and it looks like this signal can be introduced slow enough to trick the receiver in real-world applications. One trick to protect yourself is to ensure the signals you receive are from the direction you expect but we aren’t going to attach directional antennas on every face of a civilian aircraft, to ensure the strongest signal is from the top of the plane and not the bottom. Essentially civil navigation equipment isn’t supposed to be messed with and if it is authorities are supposed to go over and arrest and fine the idiots doing things over the radio they shouldnt. When thw bad guy is a government well yea I guess that plan doesn’t work and governing bodies such as ICAO should impose penalties like no commerical aircraft from those companies is allowed elsewhere.

• ⁨Comment⁩ on ⁨Netflix to open branded retail stores for some reason⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  Don’t worry dinner will be cancelled midway through the appetizers 😔