The paper Measuring phase scintillation at different frequencies with conventional GNSS receivers operating at 1 Hz, co-funded by the BELS+ project has been published in the Journal of Geodesy. The paper is available in open access at the following link.
Abstract of the paper:
Ionospheric scintillation causes rapid fluctuations of measurements from Global Navigation Satellite Systems (GNSSs), thus threatening space-based communication and geolocation services. The phenomenon is most intense in equatorial regions, around the equinoxes and in maximum solar cycle conditions. Currently, ionospheric scintillation monitoring receivers (ISMRs) measure scintillation with high-pass filter algorithms involving high sampling rates, e.g. 50 Hz, and highly stable clocks, e.g. an ultra-low-noise Oven-Controlled Crystal Oscillator. The present paper evolves phase scintillation indices implemented in conventional geodetic receivers with sampling rates of 1 Hz and rapidly fluctuating clocks. The method is capable to mitigate ISMR artefacts that contaminate the readings of the state-of-the-art phase scintillation index. Our results agree in more than 99.9% within ± 0.05 rad (2 mm) of the ISMRs, with a data set of 8 days which include periods of moderate and strong scintillation. The discrepancies are clearly identified, being associated with data gaps and to cycle-slips in the carrier-phase tracking of ISMR that occur simultaneously with ionospheric scintillation. The technique opens the door to use huge databases available from the International GNSS Service and other centres for scintillation studies. This involves GNSS measurements from hundreds of worldwide-distributed geodetic receivers over more than one Solar Cycle. This overcomes the current limitations of scintillation studies using ISMRs, as only a few tens of ISMRs are available and their data are provided just for short periods of time.
Note from the Authors:
This work was supported in part by the Spanish Ministry of Science, Innovation and Universities Project RTI2018-094295-B-I00, in part by the H2020 Projects BELS-PLUS and NAVSCIN, and in part by Vietnamese Government-funded project No DTDL.CN-54/16. Authors acknowledge the use of data from the International GNSS Service and project SCIONAV, ESA-ITT 1-8214/15/NL/LvH of the European Space Agency.