I spent some time today looking at technical information about GPS receivers. I had known for some time that it was possible to determine the relative position of two receivers to a very high degree of accuracy, but didn’t know the details. Here’s one method that appears to have popped up in my brief research, I’m mostly leaving it here as a bookmark for myself.
Using techniques like this, it is possible to determine the distance between two points several kilometers apart to just a few hundred microns. This makes it possible to use GPS receivers to measure things like the movement of tectonic plates.
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