Software Platforms

PRIDE PPP-AR is an open-source, high-precision, multi-system GNSS post-processing software developed by the research group for applications across various fields of Earth sciences. It fully supports GPS, GLONASS, Galileo, BDS-2/3, and QZSS constellations. Its key innovation lies in integrating all available frequencies to enable dual-frequency ionosphere-free PPP-AR techniques with ultra-long continuous processing capability (up to 108 days), combined with troposphere modeling based on the Vienna Mapping Functions (VMF1/VMF3) and second-order ionospheric corrections derived from GIM data. These features significantly improve positioning accuracy for geodesy, seismic monitoring, aerial photogrammetry, shipborne gravimetry, and LEO satellite orbit determination. The software is particularly effective in handling 50 Hz high-rate data and high-dynamic platforms, and is fully compatible with the latest IGS standards (including Bias-SINEX, the IGS20 reference frame, and the ORBEX attitude format). It also incorporates several specialized modules, such as ocean tide loading corrections from the Chinese Academy of Surveying and Mapping, receiver clock-jump repair, and static-station multipath mitigation. Furthermore, its cross-platform GUI enables convenient access to rapid (RAP) and real-time (RTS) products, and the system is capable of processing historical data affected by Selective Availability (SA). Together, these features provide a robust, high-efficiency, end-to-end precise data processing engine for both scientific research and engineering applications. PRIDE PPP-AR is available at: https://github.com/PrideLab/PRIDE-PPPAR. Required precise products can be downloaded from:ftp://igs.gnsswhu.cn/pub/whu/phasebias/.

PRIDE PPP-AR Software Architecture

GSeisRT is a wide-area real-time PPP engine independently developed by our research group for BDS/GNSS applications. It supports multi-GNSS constellations (GPS, GLONASS, Galileo, BDS, and QZSS), enabling real-time precise point positioning with ambiguity resolution, and provides global users with centimeter-level positioning services. By utilizing a regional GNSS network to estimate satellite clock and phase bias corrections in real time, GSeisRT reduces the latency of IGS global products by a factor of 2–3, thereby enhancing system autonomy, stability, and the achievable positioning accuracy within the regional network. Real-time results from the U.S. NOTA network show that GSeisRT achieves horizontal positioning accuracy better than 2 cm and vertical accuracy better than 3 cm within 24 hours—representing a 30–40% improvement over global PPP/PPP-AR performance. This demonstrates that GSeisRT is particularly well suited for real-time processing within dedicated or proprietary GNSS networks. In addition, GSeisRT can be co-located and tightly integrated with accelerometers in an all-in-one strong-motion sensor. Under high-rate data streams, this configuration yields smoother and more accurate fused displacement solutions, further enhancing real-time seismic monitoring capabilities.

GSeisRT Software Architecture