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…

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

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 the 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 companies from those countries are not allowed elsewhere.

Would be funner with this kid: https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fi.redd.it%2Fbbus95pvpch41.png

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Upvote just for that link I hand it out every time I get asked a controls question

But yea another guy drifting in from the homepage who normally works with physical systems where I can assume I’m in the continuous domain and can do the PID loop with a fast enough computer / sensors.

That said seems like the relationship poles / zeros and your physical components are given by the set of equations found in eq 4 of your second link.

Assuming you used, something like desired second order behavior (%OS, settling time etc), pole placement or lqr methods to pick where those poles should be for your desired system performance you should be able to plug those poles/ zeros in with one real component value to nail something to reality then solve for the rest.

Again you’ll probably get values that are stupid specific and you’ll round up or down to get things you actually can buy or have on hand and you’ll recompute the poles and zeros and see how far off you are from your goal. Provided they aren’t shifted tooff the right hand side of the plane you can test or simulate to make sure you meet your minimal performance requirements.

Edit shifted left to right damn I should do control theory rants at 11pm

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

Well it’s dark humor and I can see how some are deeply offended. The post even says it’s a slow growing treatable form, so personally I’ll laugh at the joke. It’s not like he’s end stage untreatable form of cancer. Like you know arch linux running on WSL level cancer.