Patent ID: 9274228
Filing Date: 2016-03-01
CPC Classification: G01S

Claim Text:
1. A method in a receiver apparatus configured to receive positioning signals from Global Navigation Satellite System (GNSS) satellites, comprising: positioning the receiver apparatus at a time value by, for each of a plurality of GNSS satellites: using an algebraic solution of a differential equation of motion of the GNSS satellite to determine a position of the GNSS satellite at the time value; using positioning signals received at the receiver apparatus at the time value from the GNSS satellite; and having received, for each of the plurality of the GNSS satellites, first information for defining a first algebraic function that relates a time variable to a first mapped variable, performing long-term-accurate-positioning of each of the plurality of the GNSS satellites without a need for receiving updated ephemeris data by: using the first information defining the first algebraic function to convert the time value of the time variable to a first value of the first mapped variable; converting the first value of the first mapped variable to a second value of a second mapped variable; and positioning the GNSS satellite by converting the second value of the second mapped variable to a position value that positions the GNSS satellite at the time value.