Feedback based indoor localization using digital off-air access units

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.

2. The method of claim 1 , wherein updating the delay value based on the measured geographic position further comprises:

receiving a predetermined geographic position;

determining a position error value corresponding to the predetermined geographic position and the measured geographic position; and

processing, by an adaptive algorithm, the position error value, wherein the adaptive algorithm outputs a new delay value.

3. The method of claim 1 , further comprising:

receiving, by the feedback system, a threshold value;

receiving, by the feedback system, a predetermined geographic position;

determining, by the feedback system, a position error value, wherein the position error value is based on the measured position and the predetermined geographic position; and

transmitting a position alarm when the position error value exceeds the threshold value.

4. A method comprising:

receiving, at each of a plurality of Off-Air Access Units (OAAUs), an individual satellite navigation signal from a satellite;

routing signals from the plurality of OAAUs to a plurality of Digital Remote Units (DRUs) located at a remote location;

delaying each individual satellite navigation signal, wherein each of the plurality of DRUs transmits one or more delayed satellite navigation signals;

receiving, at a satellite navigation system receiver at the remote location, the one or more delayed satellite navigation signals; and

transmitting a measured position based on the one or more delayed satellite navigation signals from the satellite navigation system receiver to a feedback system.

5. The method of claim 4 , wherein the feedback system is communicatively coupled to at least one of the plurality of DRUs.

6. The method of claim 4 , wherein routing signals from the plurality of OAAUs to the plurality of DRUs located at the remote location further comprises:

routing signals from the plurality of OAAUs to one or more Digital Access Units (DAUs), wherein the DAUs are configured to route signals between each of the one or more DAUs; and

routing signals from the one or more DAUs to the plurality of DRUs.

7. The method of claim 4 , further comprising converting the individual satellite navigation signal received at each of the plurality of OAAUs into a digital satellite navigation signal.

8. The method of claim 7 , wherein the digital satellite navigation signal is in compliance with the Common Public Radio Interface (CPRI) standard.

9. The method of claim 7 , wherein routing signals from the plurality of OAAUs further comprises routing the digital satellite navigation signal to one or more of the plurality of OAAUs.

10. The method of claim 7 , wherein routing signals from the plurality of OAAUs to the plurality of DRUs at a remote location further comprises:

multiplexing, by at least one of the plurality of OAAUs, the digital satellite navigation signal from each of the plurality of OAAUs to provide a multiplexed signal; and

routing, by the at least one of the plurality of OAAUs, the multiplexed signal to at least one of the plurality of DRUs located at the remote location.

11. The method of claim 4 , further comprising:

receiving, by the feedback system, a threshold value;

receiving, by the feedback system, a predetermined geographic position;

determining, by the feedback system, a position error value, wherein the position error value is based on the measured position and the predetermined geographic position;

determining that the position error value exceeds the threshold value; and

transmitting a position alarm.

12. A method comprising:

receiving, at each of a plurality of Multiple Input Off-Air Access Units (MIOAAUs), a GPS signal from a GPS satellite;

routing signals from the plurality of MIOAAUs to one or more of the plurality of MIOAAUs;

routing signals from at least one of the plurality of MIOAAUs to a plurality of digital remote units (DRUs) located at a remote location;

delaying, by at least one of the plurality of DRUs, each GPS signal;

transmitting, by the at least one of the plurality of DRUs, the delayed GPS signals;

receiving, by a GPS receiver at the remote location, the delayed GPS signals; and

transmitting a measured position based on the GPS signals from the GPS receiver to a feedback system.

13. The method of claim 12 , wherein the feedback system is communicatively coupled to at least one of the plurality of DRUs.

14. The method of claim 12 , further comprising converting, by each of the plurality of MIOAAUs, the GPS signal into a digital satellite navigation signal.

15. The method of claim 14 , wherein the digital satellite navigation signal is in compliance with the Common Public Radio Interface (CPRI) standard.

16. The method of claim 14 , wherein routing signals from the plurality of MIOAAUs further comprises routing the digital satellite navigation signal to one or more of the plurality of MIOAAUs.

17. The method of claim 14 , further comprising:

multiplexing, by at least one of the plurality of MIOAAUs, the digital satellite navigation signal from each of the plurality of MIOAAUs to provide a multiplexed signal; and

routing, by at least one of the plurality of MIOAAUs, the multiplexed signal to at least one of the plurality of DRUs located at the remote location.

18. The method of claim 12 , further comprising:

receiving, by the feedback system, a threshold value;

receiving, by the feedback system, a predetermined geographic position;

determining, by the feedback system, a position error value, wherein the position error value is based on the measured position and the predetermined geographic position;

determining that the position error value exceeds the threshold value; and

transmitting a position alarm.

19. The method of claim 12 , wherein routing signals from the at least one of the plurality of MIOAAUs to the plurality of DRUs located at the remote location further comprises:

routing signals from the plurality of MIOAAUs to one or more Digital Access Units (DAUs), wherein the DAUs are configured to route signals between each of the one or more DAUs; and

routing signals from the one or more DAUs to the plurality of DRUs.