Abstract: A method of collecting RF fingerprint data in a cross-correlated manner is disclosed. At each of a plurality of locations RF signals are sensed with a wireless communication device to form first sensed data, the RF signals transmitted according to a first standard. At each of the plurality of locations RF signals are sensed with a wireless communication device to form second sensed data, the RF signals transmitted according to a second other standard. Location is sensed to provide location data relating to said location. Then, the first sensed data, the second sensed data and the location data are stored within a database for forming a plurality of RF fingerprints related to a plurality of locations.

Abstract: A method for determining a location of a mobile electronic device includes receiving from said device, at a first electronic device, a first RF signal comprising a wireless signal according to a first standard other than a GPS standard. First RF fingerprint data is provided based on the first RF signal. A second RF signal comprising a wireless signal according to a second standard other than a GPS standard is received from said device at a second electronic device. Second RF fingerprint data is provided based on the second RF signal. Device specific RF signal fingerprint data is determined in dependence upon each of the first and second RF fingerprint data. The location of the device is determined using the first RF signal, the device specific RF signal fingerprint data for the first standard, the second wireless signal, and the device specific RF signal fingerprint data for the second standard.

Abstract: A method is disclosed for determining a region of highest probability. At a first electronic device an RF signal is received comprising a first wireless signal and a second wireless signal is received. The first wireless signal and the second wireless signal are each other than solely a GPS signal. Based on both the first wireless signal and the second wireless signal, a region of highest probability is determined comprising an area of location estimates for the electronic device, the determined region of highest probability other than a region of highest probability determinable independently with each of the first RF signal and the second RF signal.