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Examining the Tolerance of GNSS Receiver Phase Tracking Loop Under the Effects of Severe Ionospheric Scintillation Conditions Based on Its Bandwidth
Author(s) -
Portella Igor Ponte,
de O Moraes Alison,
da Silva Pinho Marcelo,
Sousasantos Jonas,
Rodrigues Fabiano
Publication year - 2021
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2020rs007160
Subject(s) - scintillation , interplanetary scintillation , gnss applications , fading , bandwidth (computing) , phase locked loop , amplitude , multipath propagation , physics , computer science , electronic engineering , detector , optics , telecommunications , phase noise , global positioning system , engineering , channel (broadcasting) , coronal mass ejection , quantum mechanics , magnetic field , solar wind
This study aims to evaluate the performance of phase‐locked loop (PLL) under the presence of distinct scintillation patterns in the signal. Scintillation is very common in low‐latitude regions due to the ionospheric dynamics. Under strong scintillation scenario the occurrence of deep fading events is usually registered and may cause severe degradation in the communication. The investigation conducted in this study uses the amplitude scintillation index S 4 , the decorrelation timeτ 0 , and the bandwidthB nas main parameters. The study evaluates 54 different combinations of these parameters. The results indicate that in order to minimize the occurrence of cycle slips in the output phase of the PLL, the most appropriate tracking loop bandwidthB ndepends on the values of both S 4 andτ 0 , which characterize the scintillation fading pattern. Simulations showed that as the S 4 index increases, the automatic increment in the PLL bandwidth may not be the best choice as the performance depends on the temporal characteristics of the scintillating signal. The analysis showed that, among the configurations tested, the equivalent noise bandwidth of 10 Hz achieved the best performance overall. The investigation also showed that choosing the wrong parameter regarding the PLL bandwidth may increase the probability of cycle slip by up to 10 times during fading events.