Patent ID: 7561885

Claim:
A positioning system using a mobile Internet signal, comprising: access points for transmitting downlink signals for mobile Internet communications; an access terminal for receiving the downlink signals and generating positioning information using the downlink signals and access point information on the access points; and a position determination entity (PDE) for calculating range values between the access terminal and the access points using the positioning information from the access terminal and determining a position of the access terminal using the calculated range values, wherein the PDE calculates respective calculation equations for obtaining ranges between the access terminal and the access points, determines a reference access point and adjacent access points from the access points, calculates a difference equation between a calculation equation for obtaining a range between the access terminal and the reference access point and calculation equations for obtaining ranges between the access terminal and the adjacent access points, calculates position information of the access terminal and quadratic equations relating to the ranges between the access terminal and the access points using the difference equation and calculates the position of the access terminal using the position information of the access terminal, the quadratic equations relating to the ranges between the access terminal and the access points and the range values between the access terminal and the access points.