Systems and methods for indoor positioning using wireless positioning nodes

A method for determining a location of a mobile device within an indoor environment, the method comprising:

• transmitting, by a first positioning node (PON), a first modulated signal;
• transmitting, by a second PON disposed in a different location than the first PON, a second modulated signal ;
• receiving, at a server, a request from the mobile device indicating a coarse location of the mobile device;
• transmitting, by the server, location information related to first PON and the second PON based on the request, and signal information related to the first modulated signal and the second modulated signal;
• and
• receiving, at the server, a position report from the mobile device, the position report being based on a difference in time between the first modulated signal and the second modulated signal at a time of arrival at the mobile device.

A method for determining a location of a mobile device within an indoor environment having one or more positioning nodes (PONs), the method comprising:

• determining, at a mobile device, a coarse location of the indoor environment;
• transmitting a request to a server including the coarse location;
• receiving aiding information from the server based on the coarse location;
• receiving a first positioning signal from a first antenna;
• receiving a second positioning signal from a second antenna, the second positioning being out of phase with the first positioning signal;
• receiving a third positioning signal from a third antenna, the third positioning signal being out of phase with the first positioning signal and the second positioning signal;
• and
• determining a position of the mobile device based on a one-way time-difference of arrival (TDOA) between the first positioning signal, the second positioning signal, and the third positioning signal.