Feedback based indoor localization using digital off-air access units

Abstract

A system for indoor localization using satellite navigation signals in a Distributed Antenna System includes a plurality of Off-Air Access Units (OAAUs). Each of the plurality of OAAUs is operable to receive an individual satellite navigation signal from at least one of a plurality of satellites and operable to route signals optically to one or more DAUs. The system also includes a plurality of remote DRUs located at a remote location. The plurality of remote DRUs are operable to receive signals from a plurality of local DAUs. The system further includes an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs and a GPS receiver at the remote location used in a feedback loop with the DRU to control the delays.

What is claimed is: 
     
         1 . A method comprising:
 transmitting, by a remote unit, one or more delayed satellite navigation radio frequency (RF) signals;   receiving, by a remote satellite navigation system receiver, the one or more delayed satellite navigation RF signals;   determining, by the remote satellite navigation system receiver, a measured geographic position corresponding to the one or more delayed satellite navigation RF signals;   transmitting, by the remote satellite navigation system receiver, the measured geographic position;   receiving, by a feedback system, the measured geographic position; and   updating, by the feedback system, a delay value based on the measured geographic position.