@Article{LopesAntFohKriKug:2023:LiTiFi,
               author = "Lopes, Rafael Anderson Martins and Antreich, Felix and 
                         Fohlmeister, Friederike and Kriegel, Martin and Kuga, Helio 
                         Koiti",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {German Aerospace 
                         Center (DLR)} and {German Aerospace Center (DLR)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Linear time-invariant filtering for real-time monitoring of 
                         ionospheric scintillation in GNSS receivers",
              journal = "GPS Solutions",
                 year = "2023",
               volume = "27",
               number = "3",
                pages = "e131",
                month = "July",
             keywords = "Ionospheric scintillation monitoring, GNSS, Real-time phase 
                         estimation, Traditional FLL, Kalman FLL, Traditional PLL, Kalman 
                         PLL.",
             abstract = "We propose an algorithm for estimating the ionospheric 
                         scintillation phase on global navigation satellite systems (GNSS) 
                         receivers for scintillation monitoring. The algorithm comprises 
                         linear time-invariant filtering of available observables or easily 
                         derived in traditional or Kalman filter-based carrier tracking 
                         loop structures, exploiting their complementary frequency content 
                         to provide real-time scintillation phase estimates for monitoring 
                         purposes. This algorithm is developed for receivers with 
                         traditional and Kalman frequency locked loops, but can be adapted 
                         to receivers with traditional and Kalman phase locked loops. The 
                         performance of the algorithm is evaluated via simulations with 
                         synthetic severe scintillation data, showing its capability to 
                         provide the scintillation phase estimates. In addition, we 
                         evaluated the algorithm with real data presenting equatorial 
                         scintillation collected by a professional GNSS receiver, where the 
                         scintillation phase standard deviation computed from the estimates 
                         provided by the real-time algorithm is compared to the standard 
                         deviation derived by post-processing, showing good agreement.",
                  doi = "10.1007/s10291-023-01470-0",
                  url = "http://dx.doi.org/10.1007/s10291-023-01470-0",
                 issn = "1080-5370 and 1521-1886",
             language = "en",
           targetfile = "s10291-023-01470-0.pdf",
        urlaccessdate = "02 maio 2024"
}