Global Navigation Satellite Systems (GNSS) have many applications in modern society and form the critical geospatial infrastructure needed for precise positioning (with cm-level or better accuracy).
The rapid development and launch of new GNSS constellations will increase the accuracy, reliability and integrity of real-time GNSS precise positioning, creating a platform to extend current capabilities in this field.
GNSS Network real-time kinematic (NRTK) positioning and precise point positioning (PPP) are the two most commonly used techniques for real-time high accuracy positioning. The performances of these two techniques are still limited due to the fact that various errors currently cannot be mitigated or modelled effectively in real-time mode. This significantly affects the speed and accuracy of the ambiguity resolution and the positioning. Algorithms for atmospheric error modelling and carrier phase ambiguity resolution are critical for improving state of the art precise GNSS positioning technologies.
The SPACE research centre focuses on new methods and algorithms for regional atmospheric error modelling and carrier phase ambiguity resolution using multi-GNSS systems, NRTK and PPP techniques. It also aims to develop a near real-time PPP system based on multi-GNSS constellations using high accuracy single frequency receivers. The outcomes of this research will have a significant impact on improving the performance of GNSS precise positioning and advancing current GPS research.
Current research topics are as follows:
- Multi-GNSS , Network Real-Time Kinematic (RTK), Precise Point Positioning (PPP)
- Radio Occultation and GNSS meteorology
- Positioning, Navigation and Timing (PNT)
- Surveying and geodesy
- Ray tracing and reflectometry
- Structural and engineering deformation monitoring and detection
- Integration of GPS, INS, GIS and other geospatial technologies