| 摘要 |
A system (1200) and a method (700, 800) are provided for determining the position of a mobile unit (MU) in communication with a network in an environment. A database (720) is provided with coefficients of a polynomial function representative of a relationship between received signal strength indicators (RSSIs) of network access points (APs) and physical distances (PDs) between reference points and each AP. RSSIs are obtained (725) at the MU from the APs and a physical distance is calculated (730) between the MU and each AP based on the RSSIs and the coefficients for each AP. The position of the MU is next calculated (735) based on the calculated PDs. When the environment comprises sub-regions with variable signal propagation characteristics, the method (800) determines coefficients for each sub-region and determines the sub-region in which the mobile unit is located with a fingerprint positioning method (802). |
