Patent ID: 6473694
Filing Date: 2002-10-29
Classification: G01S

Abstract:
A method for solving for the position of a satellite positioning system receiver, the receiver having a receiver clock with a receiver clock offset and responsive to ranging codes from at least one satellite, the ranging code from the at least one satellite including a navigation component conveying information about the satellite and having a time of flight from the satellite, the method of use in signal conditions where the ranging codes can be baseband processed so that at least a repeating part of the pseudorange for the at least one satellite can be determined, the method comprising the steps of:a) including the system time at arrival as an independent and additional variable of the pseudorange function for each of the ranging codes, a variable in addition to the receiver position; b) providing estimates of the times of flight of the ranging codes and of the repeating part of the pseudoranges for each of the ranging codes; c) receiving information about the at least one satellite sufficient to determine the orbit of the at least one satellite, although not necessarily the position of the at least one satellite; and d) solving simultaneously for the receiver position and the system time at arrival.