Patent ID: 7551579
Filing Date: 2009-06-23
Classification: H04B,H04W

Abstract:
1. In a positioning system having a plurality of Wi-Fi access points in a target area, a method for determining a quality of estimation of characteristics of a Wi-Fi access point, the method comprising: a Wi-Fi enabled scanning device receiving and measuring a number of received signal strength (RSS) samples of a Wi-Fi signal transmitted by the Wi-Fi access point; estimating a total distance traveled by the Wi-Fi enabled scanning device while measuring the number of RSS samples; using the estimated total distance traveled to calculate the quality of estimation of characteristics of the Wi-Fi access point; associating a corresponding speed of travel of the Wi-Fi enabled scanning device with each RSS sample; associating a corresponding period of time of scanning with each RSS sample; determining a confidence factor, CF determining the quality of estimation, R, according to the equation: wherein: