Patent ID: 6671649
Filing Date: 2003-12-30
Classification: G01S

Abstract:
A method of determining a position of a terminal, using reception timings of signals transmitted between the terminal and a plurality of base stations, comprising the steps of:providing a plurality of candidate terminal positions; evaluating a likelihood of each of said plurality of candidate terminal positions using one of plurality of base stations as a reference for which a range error between a pseudo measured range and a pseudo range is less than for the remaining base stations, wherein said likelihood of each of said plurality of candidate terminal positions is evaluated according to a probability density of a reception timing error which is asymmetric for positive and negative values, and determining a candidate terminal position with a highest likelihood as the position of the terminal, wherein the pseudo measured range is a range between the terminal and a base station according to the reception timings of signals, and wherein said pseudo range is a calculated range between the candidate terminal position and the base station.