The Global Navigation Satellite System (GNSS) is a constellation of satellites that provides users with positioning, navigation, and timing services. The accuracy and integrity of geodetic surveying and timing in the GNSS applications is closely related to the performance of GNSS satellite orbit and clock solutions. In order to provide excellent solutions to users in real-time kinematic applications, it is preferentially requested a real-time integrity monitoring of the satellite orbit and clock corrections. In this paper a realtime time transfer methodology was employed for the integrity monitoring of the satellite orbit and clock solutions, which composed of carrier phase smoothing measurements from GPS dual frequency receivers in a real-time application network.

Keywords: GNSS, PPP, satellite orbit, satellite clock, IGU, integrity