Patent ID: 8106816
Filing Date: 2012-01-31
Classification: G01S

Abstract:
1. A method of determining a set of device parameters defining the position of a mobile device from signals received from satellites pertaining to a global navigation satellite system, where code phases of said signals are assessed and the position of the mobile device is derived from said code phases and a system time of the global navigation satellite system comprising a week number (WN) and a time of week (TOW) and assumptions on the trajectories of said satellites which depend on said system time, by resolving a system of equations using a solution algorithm, the method comprising: solving the system of equations by using the solution algorithm for each of a plurality of attempts with a system time comprising one of a plurality of week number candidates, selecting a valid week number from among the plurality of week number candidates by eliminating at least any week number candidate where the application of the solution algorithm has not yielded a solution, assigning a deviation value to any remaining week number and selecting the valid week number from among the remaining week numbers according to the deviation value, and designating the solution of the system of equations based on the valid week number as the determined set of device parameters.