Positioning with wireless local area networks and WLAN-aided global positioning systems

摘要

Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless device disassociates with the access point, the WLAN can periodically provide time, location, and decoded GPS data to the wireless device. In this manner, the wireless device can significantly reduce the time to acquire the necessary GPS satellite data (i.e. on the order of seconds instead of minutes) to determine its coordinate position.

主权项

1. A method of determining a location of a wireless device, the method including:
determining a first access point (AP) having a first known location, a second AP having a second known location, and a third AP having a third known location; determining a first radio signal strength indicator (RSSI) of the first AP, a second RSSI of the second AP, and a third RSSI of the third AP; determining weighting factors using values associated with the first RSSI, the second RSSI, and the third RSSI; and determining a coordinate location of the wireless device using the first known location, the second known location, the third known location, and the weighting factors.