Advancement in PPP by GNSS and LEO integration
The thesis project was developed by Nikolina Zallemi
In the following a short summary of the research work given by Nikolina:
“My master’s thesis was focused on investigating advancements in Precise Point Positioning (PPP) by integrating Global Navigation Satellite System (GNSS) with Low Earth Orbit (LEO) satellites. The research aims to address this limitation by integrating LEO satellites, which offer an improved geometry due to their lower orbital altitudes and fast change of position. At the present, LEO satellites are used in numerous applications such as: Telecommunication, Earth Observation, and other scientific fields, for both civilian and military purposes. To achieve the objective of the research, a hybrid constellation was simulated, including GNSS constellation and LEO satellite.”
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“The methodology involved a simulation of a real-world scenario. Additionally, it included the process of orbit construction for LEO satellites, by determining the Keplerian parameters. Several LEO configurations were built by experimenting in different orbital parameters. At the end, the constellation giving the most balanced and reliable coverage is chosen to be integrated in GNSS. The key steps included the simulation of the normal system of a Least Squares solution,
to assess the diagonal elements of the inverse of the normal matrix (N −1). To analyse
the potential accuracy it was used the Dilution of Precision (DOP) concept. Particularly,
to evaluate the effect of satellite geometry on the accuracy of the estimates of latitude,
longitude and altitude, it was used the Position Dilution of Precision (PDOP)”.
Programming languages used:
-MATLAB
-Python
Field of the research: Positioning and Location Based Services
Supervisor: Prof. Ludovico Giorgio Aldo Biagi