LinuxCon: Dragons and penguins in space [LWN.net]

LinuxCon: Dragons and penguins in space

Posted Sep 25, 2012 11:50 UTC (Tue) by nix (subscriber, #2304)
In reply to: LinuxCon: Dragons and penguins in space by khim
Parent article: LinuxCon: Dragons and penguins in space

You might want to pay attention to just how much depends on GPS these days. A smaller actor with space-interdiction capability wishing to bugger up a lot of larger actors could do worse than taking out a bunch of GPS satellites.

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LinuxCon: Dragons and penguins in space

Posted Sep 26, 2012 4:27 UTC (Wed) by khim (subscriber, #9252) [Link] (4 responses)

Military jams GPS regularly when they do military exercises. There are some inconveniences and people complain, yes, but nothing life-threatening.

You right is pointing out that people are using unreliable and fragile GPS significantly more often then it's feasible, but GPS is far from being security critical infrastructure.

Well, it is sometimes critical for military offense, but this different problem altogether (it falls under "space-technology assisted offence and as I've pointed out this is not all that reliable") - and military have replacements (may be not as efficient, but they work).

LinuxCon: Dragons and penguins in space

Posted Sep 26, 2012 18:58 UTC (Wed) by dlang (guest, #313) [Link] (1 responses)

Without Satellites, military communications and targeting will suffer drastically.

the vast majority of the 'smart' bombs that are in use rely on GPS, without GPS we are back to Korea war era targeting precision.

communications would in some ways be in worse shape (while the military keeps some of the old stuff around, just in case, the difference between what they are trained to expect to have available, and what they would have available would cause problems in itself)

space-based assets are a drastic force multiplier (both for offense and defense). I would say that they are well over a 10x multiplier, and I could see arguments putting them in the 100x range.

If being able to weaken your opponent by 10x or 100x doesn't make something a militarily significant target, I don't know what would.

LinuxCon: Dragons and penguins in space

Posted Sep 26, 2012 20:41 UTC (Wed) by khim (subscriber, #9252) [Link]

Without Satellites, military communications and targeting will suffer drastically.

On your own turf? Only if you've did something stupid and replaced reliable land-based communications with a sattelite-based ones.

the vast majority of the 'smart' bombs that are in use rely on GPS, without GPS we are back to Korea war era targeting precision.

Sure, but this an aggression, not defence. You may say that sometimes you actually need to attack someone and I may even agree with you but this does not change the fact that when you sent your 'smart' bombs to some other country you are an agressor.

communications would in some ways be in worse shape (while the military keeps some of the old stuff around, just in case, the difference between what they are trained to expect to have available, and what they would have available would cause problems in itself)

Again: not on your home turf.

space-based assets are a drastic force multiplier (both for offense and defense). I would say that they are well over a 10x multiplier, and I could see arguments putting them in the 100x range.

They are potent multiplier in a case of aggression, but for defence? Not so much. You don't need to use sattelites if you can just connect two military pieces with an optical canble (or just plan old radio). Yes, you can use sattelites to notice enemy earlier, but radars on ground work just fine, too. Only when you move to another, hostile country you need to rely on sattelites - and this move is act of aggression by defnition (when you move to friendly country you can bring the same on-ground network with you).

LinuxCon: Dragons and penguins in space

Posted Sep 26, 2012 22:00 UTC (Wed) by nix (subscriber, #2304) [Link]

Military jams GPS regularly when they do military exercises. There are some inconveniences and people complain, yes, but nothing life-threatening.

This has long ceased to be true. You might note that the military do not jam GPS in major civil centres and especially not near e.g. airports. (What GPS jamming goes on is people trying to fake their tachographs. This is causing increasing trouble and concern at fairly high levels.)

LinuxCon: Dragons and penguins in space

Posted Oct 7, 2012 19:16 UTC (Sun) by oak (guest, #2786) [Link]

I think most goods to US are transferred with ships. I think nowadays ships use GPS extensively for navigation. Taxi services would also suffer quite a lot if GPS would stop working...