Signal‐In‐Space Performance Under Multiconstellation Environment From an Indian Low Latitude Station

Biswas, Trisani; Paul, Ashik

doi:10.1029/2020rs007119

Cited by 3 publications

(5 citation statements)

References 34 publications

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“…Scintillation effects on L1 and L2 signals of GLONASS along with a comparative study of simultaneous scintillation occurrence at GPS and GLONASS have been reported earlier using observations from four different stations within Brazilian sector (de Oliveira Moraes et al., 2018). A multi‐frequency comparison of signal fading at GPS, GLONASS and Galileo, during period of scintillation has also been reported previously from a low‐latitude station (Biswas & Paul, 2021).…”

Section: Introductionsupporting

confidence: 64%

“…Equatorial and low‐latitude region of the Earth's ionosphere being most dynamic out of all, in terms of formation and evolution of ionization density depletions, transionospheric satellite links used for communication and navigation are most vulnerable to the effects of scintillation in these locations (Bandyopadhayay et al., 1997; DasGupta et al., 2004), even to the extent of complete signal outage (Biswas & Paul, 2021; de Oliveira Moraes et al., 2017; Guo et al., 2019). This paper focuses on the dynamics of satellite motion as observed from a low latitude station, in order to interpret its effect on tracking loop performance of receivers, in presence of ionospheric scintillation, caused by irregularity structures.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, observation of ground scintillation pattern from Calcutta, along with its effect on tracking loop of receivers can be frequent, especially during equinoctial months. Previous studies report cases of intense scintillation and associated loss-of-lock from this station (Biswas & Paul, 2021;Biswas et al, 2019;Goswami et al, 2020;Roy & Paul, 2013). However, a correlated study of satellite motion with loss-of-lock and S 4 has not been extensively studied, especially from a low-latitude station.…”

Section: Biswas and Paulmentioning

confidence: 97%

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Effects of the Relative Dynamics of Ionospheric Irregularities and GPS Satellites on Receiver Tracking Loop Performance

Biswas,

Paul

2023

Radio Science

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Transionospheric satellite signals are exposed to perturbation, caused by irregularities generated in the ionosphere. However, the characteristics of the satellite motion can have an additional impact on signal perturbation, in addition to the effects of irregularity structures, that drift from west to east during geomagnetic quiet conditions. This paper reports the effect of GPS satellite geometry, on tracking loop performance of ground‐based receivers, during occurrence of ionospheric scintillations. Observations are made from station Calcutta (22.58° N, 88.38° E geographic; magnetic dip 34.54°), located near the northern crest of Equatorial Ionization Anomaly (EIA), during three different solar activity periods (March 2014, March 2015 and March 2022). Efforts have been made to study the correlation of east‐west component of satellite velocity at Ionospheric Pierce Point (IPP) with duration of loss‐of‐lock and rate of signal fading (< ‐10 dB), from ground scintillation pattern observations. Results of this study show 75‐78% correlation between duration of loss‐of‐lock and eastward component of satellite velocity, for all three period of observation. Subsequently, shorter duration of loss‐of‐lock has been observed corresponding to satellite velocity being westward. Signal fading rate is found to decrease with increasing satellite velocity, having median value of the fading rate cumulative distribution percentage, corresponding to satellite velocity of 16.69 m/s, 31.76 m/s and 19.14 m/s respectively during March 2014, March 2015 and March 2022. Results of this study also indicate direction and component of satellite velocity at IPP to be a dominant cause of signal outage, even during periods of weak to moderate scintillations.

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Section: Introductionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Biswas and Paulmentioning

confidence: 97%

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Effects of the Relative Dynamics of Ionospheric Irregularities and GPS Satellites on Receiver Tracking Loop Performance

Biswas,

Paul

2023

Radio Science

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“…Scintillation caused by diffraction can occur when the radio wave interacts with a medium with many small changes in refractive index, whereas refractive scintillation takes place when the wave falls upon increased or decreased phase velocity medium (Kintner et al., 2007). Effects of ionospheric scintillation on satellite signal can be intense and most severe in the low‐latitude and equatorial regions, as some of the worst instances of signal perturbation can be observed here, even to the extent of complete loss‐of‐lock of signal (Biswas et al., 2019; Biswas & Paul, 2021; Roy & Paul, 2013).…”

Section: Introductionmentioning

confidence: 85%

Multi‐Wavelength (L and S Band) Study of Ionospheric Irregularities From an Anomaly Crest Location

2023

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This paper reports observation of moderate to intense scintillations, at S band of Indian Regional Navigation Satellite System (IRNSS). During current solar cycle 25, these occurrences are probably being reported for the first time, from a low‐latitude station Calcutta (22.58°N, 88.38°E geographic; magnetic dip 34.54°), located near the northern crest of Equatorial Ionization Anomaly. Efforts have been made to analyze irregularity dynamics at IRNSS S band, along with a comparative study at GNSS L1 to characterize occurrence and evolution of multiscale irregularity structures. Power spectral analysis technique has been applied on recorded C/NO, during scintillation patches, to measure east‐west zonal drift velocity. Efforts are also made to study intensity of signal perturbation at L5 frequency of IRNSS, compared to S band, when observed simultaneously, during period of ionospheric scintillation. Concurrent irregularity dynamics at L1, L5, and S band, particularly from a low‐latitude station, has not been extensively reported earlier. Data is recorded during vernal equinox (February–April 2022) of current solar cycle. Results of this study show occurrence of simultaneous night‐time scintillation at L1, L5, and S band. East‐west zonal drift velocity of irregularity, obtained from S band observations are found to decrease with the progress of time during 20–23 LT having a maximum value of 125 m/s. At GNSS L1, hourly average value of the velocity, is observed to maximize during 20–21 LT. Simultaneous observation of scintillation effects at L5 and S band of IRNSS led to loss‐of‐lock at L5, while no such occurrence was noted at S band.

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“…A similar study but with data from only one equinoctial month of solar active year 2014 was performed by Biswas and Paul [41] in terms of occurrence and duration of cycle slip and LoL at the northern anomaly crest location in India. They highlight the susceptibility of GLONASS L1 CA among all GNSS signals and the resistant characteristics of Galileo signals among the primary L1 signals from only three constellations (GPS, GLONASS, Galileo).…”

Section: Introductionmentioning

confidence: 87%

A Comparative Analysis of the Effect of Orbital Geometry and Signal Frequency on the Ionospheric Scintillations over a Low Latitude Indian Station: First Results from the 25th Solar Cycle

Vankadara,

Dashora,

Panda

et al. 2024

Remote Sensing

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The equatorial post-sunset ionospheric irregularities induce rapid fluctuations in the phase and amplitude of global navigation satellite system (GNSS) signals which may lead to the loss of lock and can potentially degrade the position accuracy. This study presents a new analysis of L-band scintillation from a low latitude station at Guntur (Geographic 16.44°N, 80.62°E, dip 22.18°), India, for the period of 18 months from August 2021 to January 2023. The observations are categorized either in the medium Earth-orbiting (MEO) or geosynchronous orbiting (GSO) satellites (GSO is considered as a set of the geostationary and inclined geosynchronous satellites) for L1, L2, and L5 signals. The results show a higher occurrence of moderate (0.5 < S4 ≤ 0.8) and strong (S4 > 0.8) scintillations on different signals from the MEO compared to the GSO satellites. Statistically, the average of peak S4 values provides a higher confidence in the severity of scintillations on a given night, which is found to be in-line with the scintillation occurrences. The percentage occurrence of scintillation-affected satellites is found to be higher on L1 compared to other signals, wherein a contrasting higher percentage of affected satellites over GSO than MEO is observed. While a clear demarcation between the L2/L5 signals and L1 is found over the MEO, in the case of GSO, the CCDF over L5 is found to match mostly with the L1 signal. This could possibly originate from the space diversity gain effect known to impact the closely spaced geostationary satellite links. Another major difference of higher slopes and less scatter of S4 values corresponding to L1 versus L2/L5 from the GSO satellite is found compared to mostly non-linear highly scattered relations from the MEO. The distribution of the percentage of scintillation-affected satellites on L1 shows a close match between MEO and GSO in a total number of minutes up to ~60%. However, such a number of minutes corresponding to higher than 60% is found to be larger for GSO. Thus, the results indicate the possibility of homogeneous spatial patterns in a scintillation distribution over a low latitude site, which could originate from the closely spaced GSO links and highlight the role of the number of available satellites with the geometry of the links, being the deciding factors. This helps the ionospheric community to develop inter-GNSS (MEO and GSO) operability models for achieving highly accurate positioning solutions during adverse ionospheric weather conditions.

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Signal‐In‐Space Performance Under Multiconstellation Environment From an Indian Low Latitude Station

Cited by 3 publications

References 34 publications

Effects of the Relative Dynamics of Ionospheric Irregularities and GPS Satellites on Receiver Tracking Loop Performance

Effects of the Relative Dynamics of Ionospheric Irregularities and GPS Satellites on Receiver Tracking Loop Performance

Multi‐Wavelength (L and S Band) Study of Ionospheric Irregularities From an Anomaly Crest Location

A Comparative Analysis of the Effect of Orbital Geometry and Signal Frequency on the Ionospheric Scintillations over a Low Latitude Indian Station: First Results from the 25th Solar Cycle

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