Indoor trilateralization using digital off-air access units

Patent metadata

Field	Value
Publication number	US-9958548-B2
Application number	US-201414199617-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 8, 2013
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Dali Systems Co Ltd

Inventors

• Meerkerk Daryl
• Stapleton Shawn Patrick

Classifications

• G01S19/11 Primary

  wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters · CPC title

• G01S19/13 Primary

  Receivers · CPC title