Patent ID: 6373432
Filing Date: 2002-04-16
Classification: G01S,H04B

Abstract:
A method for estimating a position of a user device in a satellite-based navigation system, the method comprising:transmitting carrier signals from a set of satellites, wherein the set of satellites includes a set of LEO satellites; accumulating and sampling at a reference station the carrier signals to obtain reference carrier phase information comprising geometrically diverse reference carrier phase information from the set of LEO satellites; accumulating and sampling at the user device the carrier signals to obtain user carrier phase information comprising geometrically diverse user carrier phase information from the set of LEO satellites; and calculating the precise position of the user device based on the reference carrier phase information and the user carrier phase information, wherein the geometrically diverse reference carrier phase information and geometrically diverse user carrier phase information from the set of LEO satellites are used to resolve parameters related to integer cycle ambiguities in the reference carrier phase information and the user carrier phase information.