Method and apparatus for precision dynamic differential positioning

Abstract From the Canadian patent

A method and apparatus for rapidly and accurately determining the position coordinates of a remote movable, receiver relative to a fixed reference receiver. The technique utilizes successive code measurements and carrier phase measurements of both the L1 and L2 carrier signals broadcast from four or more orbiting GPS satellites. Code measurements based on a weighted average of the individual L1 and L2 code measurements in each satellite/receiver link are adjusted in accordance with the corresponding carrier phase measurement for an L1-L2 carrier difference signal and are further smoothed over time. This yields a rapid determination of the remote receiver's position coordinates, with …