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Mitigating high latitude ionospheric scintillation effects on GNSS Precise Point Positioning exploiting 1-s scintillation indices (2021)
Journal Article
Guo, K., Vadakke Veettil, S., Weaver, B. J., & Aquino, M. (2021). Mitigating high latitude ionospheric scintillation effects on GNSS Precise Point Positioning exploiting 1-s scintillation indices. Journal of Geodesy, 95(3), Article 30. https://doi.org/10.1007/s00190-021-01475-y

Ionospheric scintillation refers to rapid and random fluctuations in Radio Frequency (RF) signal intensity and phase, which occurs more frequently and severely at high latitudes under strong solar and geomagnetic activity. As one of the most challeng... Read More about Mitigating high latitude ionospheric scintillation effects on GNSS Precise Point Positioning exploiting 1-s scintillation indices.

Effects of GNSS receiver tuning on the PLL tracking jitter estimation in the presence of ionospheric scintillation (2020)
Journal Article
Guo, K., Aquino, M., & Vadakke Veettil, S. (2020). Effects of GNSS receiver tuning on the PLL tracking jitter estimation in the presence of ionospheric scintillation. Space Weather, 18(7), Article e2019SW002362. https://doi.org/10.1029/2019sw002362

Ionospheric scintillation is an interference characterized by rapid and random fluctuations in radio frequency signals when passing through irregularities in the ionosphere. It can severely degrade the performance of Global Navigation Satellite Sys... Read More about Effects of GNSS receiver tuning on the PLL tracking jitter estimation in the presence of ionospheric scintillation.

Performance of BDS Navigation Ionospheric Model During the Main Phase of Different Classified Geomagnetic Storms in China Region (2020)
Journal Article
Xue, J., Aquino, M., Veettil, S. V., Hu, X., & Quan, L. (2020). Performance of BDS Navigation Ionospheric Model During the Main Phase of Different Classified Geomagnetic Storms in China Region. Radio Science, 55(4), https://doi.org/10.1029/2019RS007033

© 2020. American Geophysical Union. All Rights Reserved. Geomagnetic storms can have a great impact on the Earth's upper atmosphere, that is, the ionosphere. The activity of the ionosphere could be more pronounced during geomagnetic storms, which can... Read More about Performance of BDS Navigation Ionospheric Model During the Main Phase of Different Classified Geomagnetic Storms in China Region.

Mitigation of ionospheric scintillation effects on GNSS precise point positioning (PPP) at low latitudes (2020)
Journal Article
Vadakke Veettil, S., Aquino, M., Marques, H. A., & Moraes, A. (2020). Mitigation of ionospheric scintillation effects on GNSS precise point positioning (PPP) at low latitudes. Journal of Geodesy, 94(2), https://doi.org/10.1007/s00190-020-01345-z

© 2020, The Author(s). Global navigation satellite systems (GNSS) underpin a number of modern life activities, including applications demanding positioning accuracy at the level of centimetres, such as precision agriculture, offshore operations and m... Read More about Mitigation of ionospheric scintillation effects on GNSS precise point positioning (PPP) at low latitudes.

Ionospheric scintillation intensity fading characteristics and GPS receiver tracking performance at low latitudes (2019)
Journal Article
Guo, K., Aquino, M., & Veetill, S. V. (2019). Ionospheric scintillation intensity fading characteristics and GPS receiver tracking performance at low latitudes. GPS Solutions, 23(2), Article 43. https://doi.org/10.1007/s10291-019-0835-1

Ionospheric scintillation refers to rapid fluctuations in signal amplitude/phase when radio signals propagate through irregularities in the ionosphere. The occurrence of ionospheric scintillation can severely degrade the Global Navigation Satellite S... Read More about Ionospheric scintillation intensity fading characteristics and GPS receiver tracking performance at low latitudes.

A statistical approach to estimate Global Navigation Satellite Systems (GNSS) receiver signal tracking performance in the presence of ionospheric scintillation (2018)
Journal Article
Vadakke Veettil, S., Aquino, M., Spogli, L., & Cesaroni, C. (2018). A statistical approach to estimate Global Navigation Satellite Systems (GNSS) receiver signal tracking performance in the presence of ionospheric scintillation. Journal of Space Weather and Space Climate, 8, A51. https://doi.org/10.1051/swsc/2018037

Ionospheric scintillation can seriously impair the Global Navigation Satellite Systems (GNSS) receiver signal tracking performance, thus affecting the required levels of availability, accuracy and integrity of positioning that supports modern day GNS... Read More about A statistical approach to estimate Global Navigation Satellite Systems (GNSS) receiver signal tracking performance in the presence of ionospheric scintillation.

Analysis of the regional ionosphere at low latitudes in support of the Biomass ESA Mission (2018)
Journal Article
Alfonsi, L., Povero, G., Spogli, L., Cesaroni, C., Forte, B., Mitchell, C. N., …Floury, N. (2018). Analysis of the regional ionosphere at low latitudes in support of the Biomass ESA Mission. IEEE Geoscience and Remote Sensing Letters, 56(11), 6412 - 6424. https://doi.org/10.1109/TGRS.2018.2838321

Biomass is a spaceborn polarimetric P-band (435 MHz) synthetic aperture radar (SAR) in a dawn-dusk low Earth orbit. Its principal objective is to measure biomass content and change in all the Earth's forests. The ionosphere introduces the Faraday rot... Read More about Analysis of the regional ionosphere at low latitudes in support of the Biomass ESA Mission.

Accuracy assessment of Precise Point Positioning with multi-constellation GNSS data under ionospheric scintillation effects (2018)
Journal Article
Marques, H. A., Marques, H. A. S., Aquino, M., & Vadakke Veettil, S. (in press). Accuracy assessment of Precise Point Positioning with multi-constellation GNSS data under ionospheric scintillation effects. Journal of Space Weather and Space Climate, 8, Article A15. https://doi.org/10.1051/swsc/2017043

GPS and GLONASS are currently the Global Navigation Satellite Systems (GNSS) with full 16 operational capacity. The integration of GPS, GLONASS and future GNSS constellations can 17 provide better accuracy and more reliability in geodetic positioning... Read More about Accuracy assessment of Precise Point Positioning with multi-constellation GNSS data under ionospheric scintillation effects.

Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator (2018)
Journal Article
Ammar, M., Aquino, M., Vadakke Veettil, S., & Andreotti, M. (2018). Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator. GPS Solutions, 22, Article 32. https://doi.org/10.1007/s10291-018-0700-7

In ionospheric modeling, the differential code biases (DCBs) are a non-negligible error source, which are routinely estimated by the different analysis centers of the International GNSS Service (IGS) as a by-product of their global ionospheric analys... Read More about Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator.

Mitigation of ionospheric effects on GNSS positioning at low latitudes (2017)
Journal Article
Park, J., Vadakke Veettil, S., Aquino, M., Yang, L., & Cesaroni, C. (2017). Mitigation of ionospheric effects on GNSS positioning at low latitudes. Navigation, 64(1), https://doi.org/10.1002/navi.177

Ionospheric conditions at low latitudes are extremely harsh due to the frequent occurrence of scintillation and the presence of strong TEC gradients. For this study, the São Paulo state region in Brazil is chosen as a test area. This study presents a... Read More about Mitigation of ionospheric effects on GNSS positioning at low latitudes.

Tuning a Kalman filter carrier tracking algorithm in the presence of ionospheric scintillation (2017)
Journal Article
Susi, M., Andreotti, M., Aquino, M., & Dodson, A. (2017). Tuning a Kalman filter carrier tracking algorithm in the presence of ionospheric scintillation. GPS Solutions, 21(3), 1149-1160. https://doi.org/10.1007/s10291-016-0597-y

© 2017, The Author(s). Strong ionospheric electron content gradients may lead to fast and unpredictable fluctuations in the phase and amplitude of the signals from Global Navigation Satellite Systems (GNSS). This phenomenon, known as ionospheric scin... Read More about Tuning a Kalman filter carrier tracking algorithm in the presence of ionospheric scintillation.

Observations of quiet-time moderate midlatitude L-band scintillation in association with plasma bubbles (2017)
Journal Article
Vadakke Veettil, S., Haralambous, H., & Aquino, M. (2017). Observations of quiet-time moderate midlatitude L-band scintillation in association with plasma bubbles. GPS Solutions, 21(3), 1113-1124. https://doi.org/10.1007/s10291-016-0598-x

Observations of moderate night time amplitude scintillation on the GPS L1C/A signal were recorded at the midlatitude station of Nicosia, corresponding geographic latitude and longitude of 35.18˚N and 33.38˚E respectively, on a geomagnetically quiet d... Read More about Observations of quiet-time moderate midlatitude L-band scintillation in association with plasma bubbles.

Performance of ionospheric maps in support of long baseline GNSS kinematic positioning at low latitudes (2016)
Journal Article
Park, J., Sreeja, V., Aquino, M., Cesaroni, C., Spogli, L., Dodson, A., & De Franceschi, G. (2016). Performance of ionospheric maps in support of long baseline GNSS kinematic positioning at low latitudes. Radio Science, 51(5), 429-442. https://doi.org/10.1002/2015RS005933

Ionospheric scintillation occurs mainly at high and low latitude regions of the Earth and may impose serious degradation on GNSS (Global Navigation Satellite System) functionality. The Brazilian territory sits on one of the most affected areas of the... Read More about Performance of ionospheric maps in support of long baseline GNSS kinematic positioning at low latitudes.

L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum (2015)
Journal Article
Cesaroni, C., Spogli, L., Alfonsi, L., De Franceschi, G., Ciraolo, L., Galera Monico, J. F., …Bougard, B. (in press). L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum. Journal of Space Weather and Space Climate, 5, Article A36. https://doi.org/10.1051/swsc/2015038

This work presents a contribution to the understanding of the ionospheric triggering of L-band scintillation in the region over São Paulo state in Brazil, under high solar activity. In particular, a climatological analysis of Global Navigation Satell... Read More about L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum.

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison (2015)
Journal Article
Prikryl, P., Ghoddousi-Fard, R., Spogli, L., Mitchell, C. N., Li, G., Ning, B., …Romano, V. (2015). GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison. Annales Geophysicae, 33(6), 657-670. https://doi.org/10.5194/angeo-33-657-2015

During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7–17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. G... Read More about GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison.

Statistics of ionospheric scintillation occurrence over European high latitudes (2014)
Journal Article
Sreeja, V., & Aquino, M. (2014). Statistics of ionospheric scintillation occurrence over European high latitudes. Journal of Atmospheric and Solar-Terrestrial Physics, 120, https://doi.org/10.1016/j.jastp.2014.09.003

Rapid fluctuation in the amplitude and phase of transionospheric radio signals caused by small scale ionospheric plasma density irregularities is known as scintillation. Over the high latitudes, irregularities causing scintillation are associated wit... Read More about Statistics of ionospheric scintillation occurrence over European high latitudes.

Effect of the 24 September 2011 solar radio burst on precise point positioning service (2014)
Journal Article
Sreeja, V., Aquino, M., de Jong, K., & Visser, H. (2014). Effect of the 24 September 2011 solar radio burst on precise point positioning service. Space Weather, 12(3), 143-147. https://doi.org/10.1002/2013sw001011

An intense solar radio burst occurred on 24 September 2011, which affected the tracking of Global Navigation Satellite Systems’ (GNSS) signals by receivers located in the sunlit hemisphere of the Earth. This manuscript presents for the first time the... Read More about Effect of the 24 September 2011 solar radio burst on precise point positioning service.