An Autonomous GPS Carrier-Phased-Based System for Precision Navigation

Precision navigation tasks have traditionally been carried out in the differential positioning mode. This is due mainly to the higher positioning accuracy obtained with the differential positioning mode compared to that of GPS point positioning. A major disadvantage of GPS differential positioning, however, is its dependency on the measurements or corrections from a reference receiver; i.e., two or more GPS receivers are required to be available. New developments in GPS positioning show that a user with a single GPS receiver can obtain positioning accuracy comparable to that of differential positioning (i.e., centimeter to decimeter accuracy). This paper discusses these new GPS developments and shows how this high accuracy level could be achieved