Patent ID: 6397147
Filing Date: 2002-05-28
Classification: G01S

Abstract:
A method for determining location coordinates relative to a reference location, the method comprising:receiving a plurality of satellite signals with a receiver, said plurality of satellite signals transmitted from a plurality of satellites; determining a plurality of pseudoranges to said plurality of satellites by measuring timing patterns contained within said plurality of satellite signals; establishing said reference location at a known location; determining a plurality of true ranges between said reference location and each satellites of said plurality of satellites; determining a plurality of error terms by forming a difference between each true range of said plurality of true ranges and each corresponding pseudorange of said plurality of pseudoranges, respectively; calculating a plurality of correction terms by mathematically removing predictable inaccuracies from said plurality of error terms; retaining said plurality of correction terms; combining said correction terms with subsequent measured pseudoranges when computing feature locations of said receiver; and wherein said receiver acts first as a reference receiver; computing said plurality of correction terms, and then as a remote receiver; applying said plurality of correction terms when computing its location.