We need a high speed local x,y,(and hopefully z) positioning system that can interface with windows programming. (C++) We need to be able to track our position in a 50 x 50 ft room. Ideally, we would like the system to scan at least 60 times per second. GPS updates too slowly for our needs, so please provide suggestions as to which technology to use. Line of site solutions are not possible since occlusion by objects will prevent our product from being effecive. Suggestions for off the shelf solutions will also be rewarded.