"Getting something in a retrograde orbit is not that easy..."
OK, let's suppose you are moving at a speed of 8 kilometer per second (estimated groundspeed) as GPS satellites do. If I throw up a handful or rocks in simple stationary orbit, not circling the globe...relative to your speed they are still retrograde enough. But launching something "this way" versus "that way" is just rocket science, it can still be done easily enough, it just costs more. Compared to the cost of saving one warship or one combat aircraft? Peanuts.
"But then, only idiots wage war on the US."
Well, the good lord loves idiots, he keeps on making so many of them.
"And the Chinese aren't idiots." Ah, that's debateable. Some of their leadership are very clever and willing to make hard plans for the long run, but idiocy knows no borders, or limits.
"You can be sure that GPS assisted precision landing will not be permitted before this issue is solved
. " It isn't just landings, the FAA is under heavy pressure from airline lobbyi$t$, the same folks who convinced them to shut down the sky marshal system in the 80's and set the stage to allow 9/11, for GPS-guided flight routes, which will allow higher density in the routes. Turn off GPS and you're going to find a lot of hungry jet engines saying "I have to land NOW" with no idea of how to navigate to a runway, except the old "follow the highway to the river".
But all of that is nothing new or different. Even in the 1950's the US used to print and distribute guidebooks
for "freedom fighters" teaching them how easy it was to disrupt a modern regime, in order to overthrow it. Some of the fringe printing companies still reprint and sell that stuff, so the knowledge is out there before and beyond the internet
Look at the northeast blackout of 2003. Three days (contrary to news reports saying less) without power in major areas, all because a tree limb wasn't trimmed. Supposedly. One tree limb? Modern societies are easily
disrupted, with major consequences. Hardening the systems is terribly expensive. So, we ignore, and pretend, and take great comfort in the fact that the bad guys are usually just too dumb to figure it out. Usually--but like roaches, they're persistent.
Going back to GPS, I don't think your school
was extracting much from the encrypted military GPS signals. More likely that unknown to you, they had applied for a permit
to actually receive them. Anyone, even private individuals, was allowed to apply for those permits if they could show a need for the high-precision (non-diddled) signals. Today, with WAAS and DGPS, you'd be hard pressed to justify the permit
but AFAIK the systems are still the same, and even a new military GPS signal would be easily spoofed (or buried) by simply putting up a local GPS-type transmitter.
Heck, you could buy the jammers on ebay, truckers were using them so their operators couldn't ell when someone was goofing off with the company truck. The FCC just put the squeeze on eBay to stop those sales this year. Cell phone
None of which worries me for my purposes. Either I can drop an anchor
, or pilot, or aim for the sunrise and sunset. As long as the food
hold out, there's always a way to navigate.<G>
You can go to any air force quartermaster and order up some antiradiation missiles. Of course, you'll probably have to show some paperwork before they'll release them. But yes, basically the same ones they use to take out enemy missile launching systems and other "radar" homing missiles, can take out any radiation emitter, including the GPS jammer. And if you've got the right paperwork, you can get them for free.<G>