Rapid PPP Integer Ambiguity Resolution Assisted with RTK Technology Based on VRS

Abstract

The data processing center of ground-based augmentation system utilizes Precise Point Positioning (PPP) ambiguity resolution (AR) technology to determine the carrier phase integer ambiguities of virtual reference station (VRS). Afterwards, the carrier phase ranges without phase ambiguities at VRS-end are broadcasted to user-end. Based on the aforementioned technique, rapid PPP integer ambiguity resolution assisted with RTK technology based on VRS is realized in this study. By using single-differenced RTK solutions between the rover station and VRS, single-differenced ambiguities between them can be obtained. Since the broadcasted carrier phase observations of VRS is not affected by the phase ambiguities, the single-differenced ambiguities are then equivalent to the undifferenced phase ambiguities at the rover station. The single-differenced ambiguities can be fixed like RTK, which indirectly realizes the PPP AR at the rover station. Compared with the positioning results derived from the traditional PPP method, the PPP AR assisted with RTK based on VRS can effectively reduce the positioning convergence time and improve the positioning accuracy.