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> encrypted GPS Encrypting what? Except if you want people not to be able to use the GPS signal, which sure make sense in military context (and even then, it'
by dwild 7y ago
> encrypted GPS
Encrypting what?
Except if you want people not to be able to use the GPS signal, which sure make sense in military context (and even then, it's pretty meaningless, except if you change the key pretty regularly and you have a safe way to propagate it that won't be possible for enemies to get their hands on).
You know right that GPS signal is a one way signal? The receiver doesn't transmit anything, he just receive and use the timing and its data with some fancy math to be able find your position.
- jdklsjlkdaklk 7y agoIn a military context, they do propagate the key via their own, robust infrastructure. Over time, they've (USG) released keys and generally opened it up to the public, but they reserve the right to lock it down again. As a result, while we have sub-5ft accuracy now, there's no guarantee that in war time, we won't lose that.
- codewritinfool 7y agoIs this correct? SA, or Selective Availability (an intentional degradation of accuracy) was turned off in May of 2000. This allowed existing civilian C/A code GPS receivers to generate better solutions immediately. It did not involve any keys or release of keys. I've never seen any "released keys" and have never heard of this. When did this happen?