Patent ID: 7768963

Claim:
A device for estimating the position of itself in response to gathering wireless signal information from WLAN access points (APs), said device comprising: a WLAN radio module for receiving WLAN packets transmitted by WLAN APs in range of said device; logic located in the WLAN radio module for extracting information from said received WLAN packets to identify the WLAN APs, dividing said received WLAN packets into a plurality of segments, measuring a received signal strength indicator (RSSI) value for each segment, estimating a Doppler frequency of said received WLAN packet using the RSSI values for each segment; and cooperating with a WLAN-based positioning system to estimate the position of the device based at least in part on the extracted information identifying the WLAN APs in the range of said device and the Doppler Frequency of the received WLAN packet.