公开(公告)号：BR0309162A

公开(公告)日：2005-04-26

申请号：BR0309162

申请日：2003-04-09

Applicant: QUALCOMM INC

Inventor： RICK ROLAND R ,  STEIN JEREMY M ,  AMERGA MESSAY ,  COBATON IVAN JESUS FERNANDEZ ,  RISTIC BIRISLAV ,  BHATIA ASHOK

IPC: G01S5/00 ,  G01S5/02 ,  G01S5/14 ,  G01S19/27 ,  H04W64/00 ,  H04Q7/38

Abstract: A method and apparatus for calculating a representative measurement from multiple data measurements of signals from cellular base stations, thereby facilitating utilization of a cellular network to determine position of a mobile station even in non-line of sight and/or dynamic fading environments. A method for calculating a representative measurement includes determining a window of time, selecting data measurements within the window, and calculating a representative time of arrival responsive thereto, such as averaging all data measurements within the window. A representative RMSE estimate may be calculated. To determine a window of time all data measurements within a predetermined window from an earliest time of arrival may be selected. Alternatively the window may be determined by sliding over the data measurements. The data measurements may be stored in a database in a mobile station, and the database is updated to include each new measurement.