Local Positioning System for DJI Phantom

Hello, I am experimenting with indoor flying inside large building using a DJI phantom 3. The DJI already has a vision positioning system for indoor flight, but I want to try an achieve the hovering stability regularly found in outdoor flying. I am wondering if there is some sort of simple local positioning positioning system that can be use as an alternative to GPS. If not, would a GPS repeater work in this situation? Has anybody tried any of these ideas? 

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