Does anyone know of a technology, module, chip that can do precise location= determination...
I need something that can get 4cm (centimeters) or better repeatable (not a= bsolute) location accuracy, in an area approx 100m x 100m (or so)... 1 upd= ate per second is fine.
I am pretty sure that this is beyond the capability of GPS.
I can envision a "local LORAN-like" solution consisting of: 3 fixed statio= ns, 1 which is a master transmitter, and the other two of which transmit a = different frequency, but with a phase-locking arrangement. Then, the senso= r would need to sense these 3 frequencies, do a phase difference determinat= ion, and then use this to augment a GPS coordinate with a hyperbolic line o= f transmission.
Just as a reasonability check, 10degrees of phase at 150MHZ works out to so= mething like 5cm or so. Higher frequencies being even more precise.
Thanks for any ideas, before I go about building something like this myself= ! Tman