The GFZ real-time GNSS precise positioning service system and its adaption for COMPASS

摘要: Abstract Motivated by the IGS real-time Pilot Project, GFZ has been developing its own precise positioning service for various applications. An operational system at is now broadcasting orbits, clocks, global ionospheric model, uncalibrated phase delays and regional atmospheric corrections standard PPP, PPP with ambiguity fixing, single-frequency augmented PPP. To avoid algorithms different applications, we proposed a uniform algorithm implemented it into our software. In new processing scheme, employed un-differenced raw observations as parameters, which are properly constrained derived model or empirical characteristics of delay variation in time space. The performance terms convergence fixing depends mainly on quality received information spatial temporal constraints. observation can not only integrate NRTK seamless service, but also syncretize these two techniques unique algorithm. Furthermore, suitable both dual-frequency sing-frequency receivers. Based data streams from IGS, EUREF SAPOS reference networks, provide services point (PPP) 5–10 cm accuracy, ambiguity-fixing 2–5 cm using receiver accuracy better than 50 cm augmentation instantaneous resolution 1–3 cm accuracy. We adapted current COMPASS to service. network nine stations used orbit determination clock estimation simulated mode, products applied positioning. confirms that dm-level even cm-level achievable only.