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I guess you didn’t view the video. Fact is, ALL GPS based systems can be jammed, by many methods. I will not discuss all the legs that can be cut. To date, the only guidance systems not susceptible to jamming are INS systems ( internal laser gyros) which are very expensive, and still must be “ corrected” for error over longer distances.

Ask me how I know, I used to be tasked daily with monitoring an INS systems “ drift”, up to .3 - 1.0 miles an operational hour. From memory, more than 3 miles an hour drift required replacing the very heavy IRU’s.

That said, international media has much about the Russian successes in jamming Ukie GPS systems. Enough to have our Pentagon voicing concern and re- evaluating our own systems… do remember when Iran brought down intact a very expensive US surveillance drone.

Do realize, the West is no longer fighting a bunch of goat herders.

Laser ring gyros are better but beyond a distance smart bombs/rockets/missiles become useless due to errors larger than CEP. so inertia guidance with gps correction works best. The problem is 2 fold. You can jam, from space air and ground large areas. The system errors will build based on how far from target jamming started. The bigger issue is spoofing where the intentionally draw weapons off targets to safer locations without the risk of a jammed weapon system getting lucky with error is minimal. No low to get around spoofing, jamming … well there are lots of ways honestly and we are finding some that are dirt cheap. Lots of highly accurate data coming from space in lots of frequencies, different data types but having time codes … I will let you think about that.

For the arm chair experts - how many satellites of the GPS constellation are required for sub meter accuracy? How many redundant are desired and on long ranges handoffs to other satellites during transition. I am no expert on all of this

I read the wiki page - no personal knowledge stated above that isn’t open source.

I get it. It is possible to jam gps signals if you spam a band with enough power. You will also have to jam from multiple directions to cover the array of different satellites also broadcasting. It can be done. But it’s not an easy thing to emplace multiple powerful jammers this way. A GPS munition can take different tracks to target. In practice the jammers would have to be deployed vs a defended point for complete signal coverage.

And drift depends on time. We are not talking hours here, but minutes or seconds, depending on the jammer directional coverage vs satellite coverage. GMLRS rockets go Mach 2.5 for 80Km, or maybe 2000km/hour over the altitude range in their trajectory. That’s not a lot of time to jam, given the certain lack of directional coverage given where such powerful jammers can be deployed - not within enemy artillery range, certainly, that’s within 12-20 km of the front. Or maybe even HIMARS range, these things too are targets, including their local generators, etc. And many of the jammers would have to be placed ahead of the jammer line, and would not be adequately covered by the other jammers. So let’s say a minute or less, maybe much less, for INS drift to work.