James Spilker, one of the original architects of the GPS satellite realized a solution to GPS’ inconsistency inside of buildings. With a $40 radio chip from Rosum Corporation, a workaround has been created that detects TV signals and uses them to pinpoint your location.
Using precision timing, they figure out how far a TV signal travels before it is picked up by a device equipped with Rosum chips. Next, they compare the measurements against other data that they collect with their own listening stations and then finally calculate the device’s position.
Since the Rosum solution can’t determine altitude, and obviously won’t work where there aren’t TV signals, the solution is best used when coupled with a traditional GPS system.
Corporate Page [Rosum via DefenseTech]
