Adaptive Phase Detrending for GNSS Scintillation Detection: A Case Study Over Antarctica

• Main Authors: Spogli, Luca, Ghobadi, Hossein, Cicone, Antonio, Alfonsi, Lucilla, Cesaroni, Claudio, Linty, Nicola, Romano, Vincenzo, Cafaro, Massimo
• Other Authors: Maanmittauslaitos, National Land Survey of Finland
• Format: Article in Journal/Newspaper
• Language: English
• Published: IEEE 2023
• Subjects: Galileo; Global Navigation Satellite Systems (GNSSs); ionosphere; ionospheric irregularities; iterative filtering; modal analysis; signal processing algorithm; transform; Concordia Station; Antarc*; Antarctica
• Online Access: http://hdl.handle.net/10138/356663

We aim at contributing to the reliability of the phase scintillation index on Global Navigation Satellite System (GNSS) signals at high-latitude. To the scope, we leverage on a recently introduced detrending scheme based on the signal decomposition provided by the fast iterative filtering (FIF) technique. This detrending scheme has been demonstrated to enable a fine-tuning of the cutoff frequency for phase detrending used in the phase scintillation index definition. In a single case study based on Galileo data taken by a GNSS ionospheric scintillation monitor receiver (ISMR) in Concordia Station (Antarctica), we investigate how to step ahead of the cutoff frequency optimization. We show how the FIF-based detrending allows deriving adaptive cutoff frequencies, whose value changes minute-by-minute. They are found to range between 0.4 and 1.2 Hz. This allows better accounting for diffractive effects in phase scintillation index calculation and provides a GNSS-based estimation of the relative velocity between satellite and ionospheric irregularities.