Patent ID: 8493267

Claim:
A method of assisting a mobile station to obtain orbital information of a satellite, the method comprising: computing a correction utilizing a processor of a server between first orbit data of the satellite and second orbit data of the satellite, wherein the second orbit data is more precise than the first orbit data; transforming spatial components of the correction from a first coordinate system to a second coordinate system utilizing the processor of the server, the second coordinate system selected such that the variation of the correction in the second coordinate system is substantially smooth over time, wherein the computed correction further comprises one or more clock correction parameters representing an approximate difference between a clock timing of the first orbit data and a predicted clock bias, and wherein the computed correction is represented by one or more coefficients to be applied to first orbit data for the satellite stored at the mobile station to estimate more precise orbit data for the satellite; and transmitting the computed correction in the second coordinate system from the server to the mobile station.