The theme of this research project is the very high sensitivity acquisition of GNSS signals, especially GPS and Galileo, for navigation in space. Indeed, in such context it is necessary to have a very high sensitivity for several reasons: 1. Due to the distance involved, which are much larger compared to terrestrial users; 2. Because the GNSS signals are used in a way that was not expected at the beginning, i.e. in directions where the power transmitted by the satellites is much lower; 3. The dynamics are extremely variable (very fast in low orbits, and very slow in high orbits).
This thematic, started long ago, is currently highly topical with the soon arrival of four global constellations (GPS, GLONASS, Galileo, BeiDou). However, this is a difficult theme, because physical limits apply and require new strategies for an efficient and flexible acquisition.
The goal of this project is therefore to design the acquisition of a GNSS receiver for space, which is both flexible and efficient. This means that the acquisition time and the resources used should be as low as possible; the receiver should be able to acquire signals with a very weak power or with a very high Doppler, and it should be able to work autonomously as well as to exploit the potential assistance available.