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Multi-GNSS precise position, velocity, and acceleration determination for airborne gravimetry over Antarctica


Li,  Min
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Li, M. (2020): Multi-GNSS precise position, velocity, and acceleration determination for airborne gravimetry over Antarctica, PhD Thesis, Berlin : Technische Universität Berlin, 95 p.

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000508
The precise knowledge of aircraft position, velocity, and acceleration is a mandatory prerequisite for airborne gravimetry. For the determination of these quantities the Global Navigation Satellite System (GNSS) plays an important role. However, kinematic positioning over Antarctica is a challenging task which is different from positioning in low-latitude regions. The main reason is the sparse distribution of International GNSS Service (IGS) ground stations which is also difficult or impractical to be densified by setting up dedicated reference stations because of its hostile environment. Therefore, traditional double-differenced (DD) positioning using Global Positioning System (GPS) may be difficult to be applied. Precise Point Positioning (PPP) using a stand-alone receiver is recognized as a helpful tool for obtaining reliable and accurate trajectories of moving platforms based on precise orbit and clock products derived from a global reference network. Therefore, it is necessary to study the special characteristics of positioning over Antarctica and to exploit innovative and reliable approaches for precise position, velocity and acceleration determination. An extended precise positioning method called Precise Orbit Positioning (POP), which was originally developed in Salazar et al. (2009), is further developed towards application with multi-GNSS data. This approach takes advantage of a widely spaced network of ground stations to estimate satellite clock offsets and drifts and only relies on precise orbit information. It is illustrated that POP has the potential to achieve centimeter-level accuracy for the vertical component with sparse distributed reference stations. The aforesaid POP method is extended further to derive reliable and high accurate velocity and acceleration which are more important than position for airborne gravimetry. A GPS+GLONASS+Galileo+BDS four-system model is presented and proper weighting of different types of observations is investigated. The PPP solutions are also calculated with multi-GNSS observations for comparison. During static tests over Antarctica, it was found that POP derived velocity and acceleration tend to have much lower noise than the PPP solutions. Moreover, the addition of GLONASS, Galileo and BDS data can increase the accuracy of velocity and acceleration estimates by 32% and 43% with POP compared to a GPS-only solution when using data of 30-second sampling interval and the improvements are 28% and 31% with respect to the PPP solutions.