Indoor trilateralization using digital off-air access units
A system for indoor localization using satellite navigation signals in a Distributed Antenna System. The system includes a plurality of Off-Air Access Units (OAAUs), each operable to receive an individual satellite navigation signal from at least one of a plurality of satellite navigation systems (e.g., GPS, GLONASS, Galileo, QZSS, or BeiDou) and operable to route signals optically to one or more DAUs. The system further includes a plurality of remote DRUs located at a Remote location that are operable to receive signals from a plurality of local DAUs. Moreover, the system includes an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs.
1. A system for indoor localization using satellite navigation signals in a Distributed Antenna System, the system comprising:
a plurality of Off-Air Access Units (OAAUs), each having directional antennas, wherein each of the plurality of OAAUs are operable to receive an individual satellite navigation signal from at least one of a plurality of satellites;
one or more Digital Access Units (DAUs), wherein the plurality of OAAUs are communicatively coupled to at least one of the one or more DAUs;
a plurality of Digital Remote Units (DRUs) located at a remote location, each having multiple directional antennas, wherein each DRU of the plurality of DRUs is operable to:
receive one or more satellite navigation signals from the one or more DAUs; and
delay each individual satellite navigation signal of the one or more satellite navigation signals based on a positional offset;
a feedback system communicatively coupled to a first DRU of the plurality of DRUs; and
a GPS receiver at the remote location communicatively coupled to the feedback system, wherein the GPS receiver transmits a measured GPS position to the feedback system.
2. The system of claim 1 wherein the satellite navigation signal comprises at least one of a GPS, GLONASS, Galileo, QZSS, or BeiDou signal.
3. The system of claim 1 wherein the one or more DAUs are coupled via at least one of a Ethernet cable, Optical Fiber, or Wireless Link.
4. The system of claim 1 wherein the plurality of OAAUs are connected to the one or more DAUs via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
5. The system of claim 1 wherein the plurality of OAAUs are connected together via a daisy chain configuration.
6. The system of claim 5 wherein the plurality of Off-Air Access Units (OAAUs) are coupled via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
7. The system of claim 1 wherein each DRU is further configured to transmit each individual satellite navigation signal of the one or more satellite navigation signals for receipt by a mobile device.
8. A system for indoor localization using GPS signals in a Distributed Antenna System, the system comprising:
a plurality of Multiple Input Off-Air Access Units (MIOAAUs), each having a plurality of directional antennas, wherein each of the plurality of directional antennas is operable to receive an individual GPS satellite signal from at least one of a plurality of GPS satellites;
one or more local Digital Access Units (DAUs), wherein each of the plurality of MIOAAUs is communicatively coupled to at least one of the one or more local DAUs;
a plurality of Digital Remote Units (DRUs) located at a remote location with multiple directional antennas, wherein each DRU of the plurality of DRUs is operable to:
receive one or more GPS satellite signals from the one or more local DAUs; and
delay each individual GPS satellite signal of the one or more GPS satellite signals based on a positional offset;
a feedback system communicatively coupled to a first DRU of the plurality of DRUs; and
a GPS receiver at the remote location communicatively coupled to the feedback system, wherein the GPS receiver transmits a measured GPS position to the feedback system.
9. The system of claim 8 wherein the plurality of MIOAAUs are coupled via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
10. The system of claim 8 wherein the individual GPS satellite signal comprises at least one of a GPS, GLONASS, Galileo, QZSS, or BeiDou signal.
11. The system of claim 8 wherein the one or more local DAUs are coupled via at least one of a Ethernet cable, Optical Fiber, or Wireless Link.
12. The system of claim 1 further comprising:
a second feedback system communicatively coupled to a second DRU of the plurality of DRUs; and
a second GPS receiver at a second remote location communicatively coupled to the second feedback system.
13. The system of claim 1 wherein the feedback system further comprises:
a server;
a processor communicatively coupled to the server, wherein the processor is configured to:
receive a known GPS position from the server;
receive the measured GPS position from the GPS receiver;
calculate a position error based on the known GPS position and the measured GPS position; and
adjust the delay based on the position error.
14. The system of claim 13 wherein the feedback system is further configured to:
calculate an alarm condition based on a threshold error value and the position error; and
transmit the alarm condition.
15. The system of claim 8 wherein the feedback system further comprises:
a server;
a processor communicatively coupled to the server, wherein the processor is configured to:
receive a known GPS position from the server;
receive the measured GPS position from the GPS receiver;
calculate a position error based on the known GPS position and the measured GPS position; and
adjust the delay based on the position error.
16. The system of claim 15 wherein the feedback system is further configured to:
calculate an alarm condition based on a threshold error value and the position error; and
transmit the alarm condition.
17. The system of claim 8 wherein each DRU is further configured to transmit each individual satellite navigation signal of the one or more satellite navigation signals for receipt by a mobile device.