An enhancement of an existing algorithm to track the GNSS signals in presence of strong scintillation is presented. The Carrier Tracking mechanism employs both a Phase Locked Loop and Frequency Locked Loop and a switching mechanism between the two in order to maintain the signal lock during power fades and phase variations; a new Loss of Lock detection method based on the linearity region of the atan2 PLL discriminator is implemented and a switch back from PLL to the FLL is proposed. The Loss of Lock performances of the new strategy are evaluated and compared to the standard PLL and FLL assisted PLL through MATLAB simulations.
The PEGASUS receiver is a newly designed prototype for GNSS application in SoL user segment. The project is part of an Italian initiative, financed by the Italian Space Agency (Agenzia Spaziale Italiana, ASI contract ASI I/024/10/0 "Evoluzione tecnologica di un ricevitore integrato GALILEO per applicazioni Safety of Life"). The project is a technological common platform where the SoL Receiver technology is developed, integrated and tested in a real environment.
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