This paper presents software receiver processing results of GPS L1, L2C, and L5 signals undergoing strong ionosphere scintillation. The data used in this study were obtained from a multi-GNSS multi-band IF data collection system at Ascension Island in March 2013. Detailed signal processing algorithms and scintillation indices calculated from carrier tracking loop output such as S4 and σ_Φ are presented and the results are compared with the output of a co-located Septentrio PolaRxS receiver.
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