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>everyone knows that would break GPS (which already operate well below the noise floor). Can you explain the noise floor bit?
by core-questions 6y ago
>everyone knows that would break GPS (which already operate well below the noise floor).
Can you explain the noise floor bit?
- Junk_Collector 6y agoThere exists a fundamental level of electrical noise at all frequencies typically controlled by the background temperature that sets the minimum level of signal you can resolve before it gets washed out in noise. GPS uses multiple coherent (noise being random instead of coherent does not combine at the same rate) copies of the signal that can be recombined to increase their effective signal, so even though they are transmitted below the universal noise floor, they are above it once recombined. *edited for spelling
- core-questions 6y agoThanks, that's very interesting. Appreciated.
- jrockway 6y agoThe reply that you already have is pretty good. https://en.wikipedia.org/wiki/Gold_code https://en.wikipedia.org/wiki/Gold_code is a good jumping off point for further research (as is the wikipedia article on GPS).