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 at least one directional antenna and each being operable to receive at least one of a plurality of satellite navigation signals from 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; and
a plurality of Digital Remote Units (DRUs) located at a remote location, wherein each individual DRU of the plurality of DRUs is operable to:
receive one or more of the plurality of satellite navigation signals from the one or more DAUs;
delay the one or more of the plurality of satellite navigation signals based on a positional offset for the individual DRU; and
broadcast, using an antenna of the individual DRU, the delayed one or more of the plurality of satellite navigation signals.
2 . The system of claim 1 , further comprising:
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.
3 . The system of claim 2 , wherein the one or more satellite signals are delayed further based on a difference between the measured GPS position and a known position of the GPS receiver.
4 . The system of claim 1 , wherein the positional offset for the individual DRU is based on a position of the individual DRU within the remote location.
5 . The system of claim 1 , wherein the plurality of satellite navigation signals include at least one of GPS, GLONASS, Galileo, QZSS, or BeiDou signals.
6 . 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.
7 . 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.
8 . The system of claim 1 , wherein the plurality of OAAUs are connected together via a daisy chain configuration.
9 . The system of claim 8 , wherein the plurality of OAAUs are coupled via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
10 . The system of claim 1 , wherein a mobile device at the remote location is configured to receive the delayed one or more of the plurality of satellite navigation signals.
11 . A method for indoor localization using satellite navigation signals, the method comprising:
receiving, by a plurality of Off-Air Access Units (OAAUs) each having at least one directional antenna, a plurality of satellite navigation signals from a plurality of satellites;
receiving, by one or more Digital Access Units (DAUs), the plurality of satellite navigation signals from the plurality of OAAUs;
for each individual Digital Remote Unit (DRU) of a plurality of DRUs located at a remote location:
receiving one or more of the plurality of satellite navigation signals from the one or more DAUs;
delaying the one or more of the plurality of satellite navigation signals based on a positional offset for the individual DRU; and
broadcasting, using an antenna of the individual DRU, the delayed one or more of the plurality of satellite navigation signals.
12 . The method of claim 11 , wherein a feedback system communicatively coupled to a first DRU of the plurality of DRUs, and wherein the method further comprises:
measuring, by a GPS receiver at the remote location, a GPS position; and
transmitting, by the GPS receiver, the measured GPS position to the feedback system.
13 . The method of claim 12 , wherein the one or more satellite signals are delayed further based on a difference between the measured GPS position and a known position of the GPS receiver.
14 . The method of claim 11 , wherein the positional offset for the individual DRU is based on a position of the individual DRU within the remote location.
15 . The method of claim 11 , wherein the plurality of satellite navigation signals include at least one of GPS, GLONASS, Galileo, QZSS, or BeiDou signals.
16 . The method of claim 11 , wherein the one or more DAUs are coupled via at least one of a Ethernet cable, Optical Fiber, or Wireless Link.
17 . The method of claim 11 , 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.
18 . The method of claim 11 , wherein the plurality of OAAUs are connected together via a daisy chain configuration.
19 . The method of claim 18 , wherein the plurality of OAAUs are coupled via at least one of Ethernet cable, Optical Fiber, or Wireless Link.
20 . The method of claim 11 , wherein a mobile device at the remote location is configured to receive the delayed one or more of the plurality of satellite navigation signals.