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

Spogli, Luca; Ghobadi, Hossein; Cicone, Antonio; Alfonsi, Lucilla; Cesaroni, Claudio; Linty, Nicola; Romano, Vincenzo; Cafaro, Massimo

doi:10.1109/lgrs.2021.3067727

Cited by 35 publications

(46 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Authors found that the scintillation impact is strongest when the appearance of the PMAFs coincides with the appearance of the PCPs. Studies (Van der Meeren et al, 2016) showed that the Sun-aligned arc in the polar cap does not cause significant phase scintillations.…”

Section: Introductionmentioning

confidence: 99%

“…During a strong and stable polar cap convection, segmentation may not happen, and a continuous tongue of ionization (TOI) may be formed across the polar cap (Foster et al, 2005). Phase scintillations in TOI were studied in the paper by Van der Meeren et al (2014), who was observed bursts of phase scintillations and no amplitude scintillations in relation to the leading gradient of the TOI. Patches may develop smaller-scale irregularities down to decametre scale through the Kelvin-Helmholtz (KH) and gradient drift instabilities (Oksavik et al, 2012;Clausen et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Upon the availability of data, the Skibotn (Norway; mainland) GPS receiver was also used. The UiO GNSS scintillation receiver is the standard GNSS ionospheric scintillation/TEC monitor (GISTM; model GSV4004B; Van Dierendonck et al, 1993). The carrier phase and power at the L1 frequency (1.57542 GHz) are tracked and recorded at 50 Hz rate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of different types of ionospheric disturbances on GPS signals at polar latitudes

2021

View full text Add to dashboard Cite

Abstract. The comparative research of the influence of different types of auroral particle precipitation and polar cap patches (PCPs) on the global positioning system (GPS) signals disturbances in the polar ionosphere was done. For this purpose, we use the GPS scintillation receivers at Ny-Ålesund and Skibotn, operated by the University of Oslo. The presence of the auroral particle precipitation and polar cap patches was determined by using data from the EISCAT 42m radar on Svalbard. The optical aurora observations in 557.7 and 630.0 nm spectrum lines on Svalbard were used as well for the detection of ionospheric disturbances. The cusp identification was done with using SuperDARN (Hankasalmi) data. We consider events when the simultaneous EISCAT 42m and GPS data were available for the years 2010–2017, and in this paper we present, in detail, typical examples describing the overall picture, and we present the statistics for 120 events. We considered the dayside/cusp precipitation, substorm precipitation, daytime and nighttime PCPs, and precipitation associated with the interplanetary shock wave arrival. We demonstrate that substorm-associated precipitation (even without PCPs) can lead to a strong GPS phase (σϕ) scintillations up to ∼ 1.5–3 radians, which is much stronger than those usually produced by other types of considered ionosphere disturbances. The value of the substorm-phase scintillations in general correlate with the value of the geomagnetic field disturbance. But sometimes even a small geomagnetic substorm, when combined with the PCPs, produces quite strong phase scintillations. Cusp phase scintillations are lower than dayside PCPs scintillations. PCPs can lead to stronger ROT (rate of total electron content) variations than other types of ionosphere disturbances. So our observations suggest that the substorms and PCPs, being different types of the high-latitude disturbances, lead to the development of different types and scales of ionospheric irregularities.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of different types of ionospheric disturbances on GPS signals at polar latitudes

2021

View full text Add to dashboard Cite

show abstract

“…A recent study [11] revealed that there exist fluctuations that are refractive in nature that can mimic phase scintillations, while [10] showed that dominant phase variations in the polar and auroral regions are indeed refractive. Recently, studies [12,13] also emphasized the importance of proper detrending in the identification of scintillation in the polar region.…”

Section: Introductionmentioning

confidence: 99%

“…Amplitude scintillation occurrence in the polar region is very low due to the nature of the scintillation producing irregularities [37]. It is compounded by completed dominance of phase variations due to the problems with the detrending of the phase of the GNSS signal [12,13] to determine the phase scintillation index. However, the introduction of the new dynamic detrending and method along with the calculation of the modified scintillation method [38] provided an opportunity to detect amplitude scintillation occurrence accurately.…”

Section: Introductionmentioning

confidence: 99%

Global Positioning System (GPS) Scintillation Associated with a Polar Cap Patch

et al. 2021

View full text Add to dashboard Cite

A Global Positioning System (GPS) network in the polar cap, along with ionosonde and SuperDARN radar measurements, are used to study GPS signal amplitude and phase scintillation associated with a polar cap patch. The patch was formed due to a north-to-south transition of the interplanetary magnetic field (IMF Bz). The patch moved antisunward with an average speed of ~600 m/s and lasted for ~2 h. Significant scintillation occurred on the leading edge of the patch, with smaller bursts of scintillation inside and on the trailing edge. As the patch moved, it maintained the integrity of the scintillation, producing irregularities (Fresnel scale) on the leading edge. There were no convection shears or changes in the direction of convection during scintillation events. Observations suggest that scintillation-producing Fresnel scale structures are generated through the non-linear evolution of the gradient drift instability mechanism.

show abstract

Ionospheric Plasma IRregularities - IPIR - data product based on data from the Swarm satellites

Jin

Kotova

Xiong

et al. 2021

Preprint

View full text Add to dashboard Cite

The dynamics of ionospheric plasma are coupled to different processes in the solar wind, magnetosphere, thermosphere and lower atmosphere. This complex coupling often gives rise to plasma instabilities and turbulence, which lead to structuring in the ionospheric plasma (Hasegawa et al., 2004;Kintner & Seyler, 1985;Moen et al., 2013). The resulting irregularities in plasma density can impact the propagation of radio waves. This leads to radar echoes and affects communication and satellite navigation services (Kintner et al., 2007). Thus, ionospheric plasma irregularities are an important aspect of the space weather system. They are also a space weather risk, which can be crucial for the ground-based operations that rely on precise positioning with the Global Navigation Satellite Systems (GNSS), such as with the GPS, GLONASS, Galileo, or Beidou satellite constellations (Jakowski et al., 2012;Pi et al., 1997).The occurrence and strength of plasma irregularities are related to the geomagnetic activity, and depend on the geomagnetic region of interest. The Interplanetary Magnetic Field (IMF) and solar wind conditions control the energy input into the magnetosphere-ionosphere-thermosphere (MIT) system (Borovsky, 2021). This is notable at high latitudes, with increased auroral activity and related phenomena during prolonged periods of the IMF B z negative, which facilitates magnetic reconnection on the dayside magnetosphere, and thus allows for the energy input into the MIT system (Carlson, 2012;Cowley & Lockwood, 1992;Lockwood & Carlson, 1992). Such phenomena as the polar cap patches (PCPs), auroral blobs, or auroral electrojects are subject to various plasma instabilities and hence to plasma structuring (Jin et al., 2014(Jin et al., , 2015(Jin et al., , 2016van der Meeren et al., 2015). Significant plasma structuring is also present in the equatorial ionosphere, where it is manifested within the Equatorial spread F (ESF) (Woodman, 2009). In the post-sunset sector, the Rayleigh-Taylor instability impacts the ionospheric F-layer, which is also reflected in the equatorial bubbles (Farley et al., 1970;Woodman & La Hoz, 1976). Thus, the polar cap, auroral oval, and post-sunset equatorial regions are characterized by the most structured plasma densities (Basu et al., 2002;. This is also seen in the statistical maps of ionospheric scintillations of transionospheric radio waves, which assign strongest scintillations to these regions (Basu et al., 1988).Characterising and monitoring of structuring in the ionospheric plasma density is thus of both scientific and practical interests. The understanding of ionospheric plasma response to external drivers, such as the solar wind, IMF, or gravity waves, will shed more light onto coupling processes in the MIT system and can contribute to the development of global ionospheric models. On the other hand the monitoring of plasma irregularities at different scales is important for the development of operational space weather services related to the quality of transionospheric radio signals...

show abstract

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

Cited by 35 publications

References 24 publications

Influence of different types of ionospheric disturbances on GPS signals at polar latitudes

Influence of different types of ionospheric disturbances on GPS signals at polar latitudes

Global Positioning System (GPS) Scintillation Associated with a Polar Cap Patch

Ionospheric Plasma IRregularities - IPIR - data product based on data from the Swarm satellites

Contact Info

Product

Resources

About