Looking for interferometer for location detection

I’m still working on this a project where I want to find and continue to know the location of 10 robots moving up to 10kph in a field about 100 yards square with 0.2-1.0 meter accuracy. RFID-Radar is -almost- a solution in a box except that it takes many seconds for it to do range-finding.

GPS isn’t accurate enough.

I’m now envisioning 2 sets of antennas using angle of arrival interferometry. I’ve been googling (and the library) my head off and not coming up with too much thus far. Do you know of an interferometry system that might detect 0.1 degree difference or so? I figure that with 2 sets, one on the X plane, one on the Y, we can get an accurate location. I’ll ping the RFID-Radar guy on this but I think he’s focused elsewhere.

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