By deploying earth based transmitters that work along side the GPS signal, ultrafine positioning can be obtained. There are very few details on how this works, such as number of transmitters, frequency, power, etc. How does this compare with other GPS helpers such as WAAS or dGPS?
A while back there was a proposal to use television frequencies (which have much better propagation properties) to provide indoor positioning. I can no longer find any references to this project. I believe it was envisioned by a guy name Rosen, who was involved with the original GPS system.
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