Patent ID: 8766849

Claim:
A mobile communication device comprising: a first wireless receiver adapted to determine, as it travels along a first path, a first plurality of positions of the mobile communication device using signals received from a primary positioning source; a second wireless receiver adapted to receive signals from one or more ambient wireless sources as the mobile communication device travels along the first path; a positioning module adapted to use the determined first plurality of positions of the mobile communication device and the received ambient wireless signals to estimate positions of the ambient sources; said positioning module being further adapted to determine a second plurality of positions of the mobile communication device using the estimated positions of the ambient sources as the mobile communication device travels along a second path, wherein said positioning module estimates positions of the ambient sources using a time of arrival of a marker in the frequency domain carried by signals transmitted by the ambient sources; and a database operative to store the estimated positions and corresponding time references of the signals of the one or more ambient sources.