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

摘要

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.