GPS Precise Point Positioning Methods Using IGS Products for Vehicular Navigation Application

Recently, GPS precise point positioning (PPP) has attracted the precision GPS community as it can provide the cm-dm level positioning accuracy with a single GPS receiver, which is almost comparable to that obtained by DGPS. We have developed a generic PPP software. Assuming a dual frequency receiver and using IGS precise satellite ephemeris and clock, the software estimates position vector of a moving (and static) antenna, a clock bias of the user receiver, tropospheric delay parameters, and ionospheric-free (non-integer) ambiguities in the undifferenced carrier phase data. In this paper, we present the results of static and kinematic PPP obtained in post-processing, with special emphasis on vehicular navigation application. The accuracy evaluation tests indicate that, for static positioning, the accuracy at the level of a sub-decimeter is achieved while for kinematic positioning, the accuracy level better than a few decimeter is possible with our software