Interfrequency Performance Characterizations of GPS During Signal Outages From an Anomaly Crest Location

Biswas, Trisani; Ghosh, Sourav; Paul, Ashik; Sarkar, Sailendra Nath

doi:10.1029/2018sw002105

Cited by 10 publications

(14 citation statements)

References 36 publications

(55 reference statements)

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“…Observations of occurrence and duration of loss‐of‐lock at GPS L1 CA, L2C, and L5 have previously been reported by Biswas et al., (2019) for vernal equinox of 2014, where suitable case studies and overall statistics were presented for each signal along with a comparative picture for different frequencies. This paper aims to report the signal outages observed on GLONASS and Galileo around the same time on satellites sharing a common ionospheric volume and illustrates a case study as well as statistics of satellites from the three constellations, namely, GPS, GLONASS and Galileo, exhibiting signal outages around the same time interval over a limited spatial swath of 5 × 5°.…”

Section: Resultsmentioning

confidence: 94%

“…The detrended carrier phase is then used to measure the occurrence and duration of the signal outage by meticulously detecting gaps in the data, if any, following the previous description of loss‐of‐lock reported by Biswas et al. (2019). Signal outages due to hardware failure of the receiver were thoroughly checked and discarded from the results of the analyses.…”

Section: Methodsmentioning

confidence: 99%

“…Deep signal fading (>15 dB) as a consequence of abrupt phase transition, observed dominantly in the equatorial region is thoroughly addressed (Humphreys et al., 2005, 2010). Study of scintillation and its effects on signal fading has been reported extensively for GPS L1 (Béniguel et al., 2009; Roy & Paul, 2013; V. V. Sreeja, Aquino, Forte et al., 2011) and even triple frequency of GPS (Biswas et al., 2019; Jiao et al., 2015; A. Moraes, Costa, Abdu et al., 2017). Focusing toward the scintillation events observed simultaneously in different GNSS signals, V. Sreeja et al.…”

Section: Introductionmentioning

confidence: 99%

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

Biswas

Paul

2021

Radio Science

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Global Navigation Satellite System (GNSS) signals have become a useful tool to analyze signal‐in‐space performance in the presence of ionospheric perturbations with a view to improve the performance of satellite‐based systems and services. For this purpose, continuous monitoring of the signal tracking capabilities of commercial GNSS receivers is a priority, particularly from regions around the crests of Equatorial Ionization Anomaly (EIA), which experiences some of the worst‐case scenarios attributed to ionospheric effects. Ample investigations are reported in literature on GPS signal fading characteristics, while the same for GLONASS and Galileo are limited from Indian low latitude region. The present study aims to report cases of cycle slips and loss‐of‐lock observed independently at GLONASS L1 CA, L2 CA and Galileo L1 BC and E5a, along with a comparative study of robustness of L1 signal in three different constellations GPS, GLONASS, and Galileo, sharing more‐or‐less common ionospheric volume. Data analyzed in this study was recorded during March 2014, a period of high solar activity, from station Calcutta (22.58°N, 88.38°E geographic; magnetic dip 34.54°), located near the northern crest of EIA. Results of this study reveal GLONASS L2 CA to be most affected signal out of all, during periods of ionospheric scintillations. However, when constellations are compared for a particular frequency (L1), Galileo appears to be the least affected. Results of this study could be significant toward better understanding of scintillation effects on GNSS signals while developing more robust applications, especially for a low latitude station.

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Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Biswas

Paul

2021

Radio Science

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“…However, in the absence of appropriate beacons, phase scintillation measurements have been very few from this region. GPS phase scintillations and associated loss of lock and cycle slips have been reported from Calcutta (Biswas et al, 2019; Roy & Paul, 2013) for the periods 2011–12 and 2014, respectively.…”

Section: Introductionmentioning

confidence: 88%

“…Hence, it is conclusively established that the effects of multipath, if any, have not weighted the statistical conclusions arrived at in the present paper. In addition, there have been previous reports from this station where an elevation cutoff angle of 15° has been used (Biswas et al, 2019; Das et al, 2014; Goswami et al, 2018; Paul et al, 2017; Ray et al, 2017; Roy & Paul, 2013). During the analysis of data, it was thoroughly checked that the cases of signal outages or nonavailability of satellite signal presented in this paper are purely due to ionospheric perturbations and not caused by receiver malfunction or poor satellite‐to‐receiver geometry.…”

Section: Methodsmentioning

confidence: 99%

Degradation of Satellite‐Based Navigation Performance Observed From an Anomaly Crest Location in the Indian Longitude Sector

2020

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GPS amplitude and phase scintillations in terms of the index S4 and σϕ and the corresponding losses of lock in signal have been studied with consequent errors in receiver positions for the whole month of March 2014 from Calcutta situated near the northern crest of the equatorial ionization anomaly (EIA). The impact of phase and amplitude scintillations is found to be different on GPS satellites in terms of intensities and duration. There are 42 and 59 cases of loss of lock in C/NO and phase, respectively, all occurring during 13–18 UT (LT = UT + 06:00). For all the cases, duration of amplitude loss of lock is longer than that of phase loss of lock. Associated with such signal perturbations, deviations in receiver positions are found to occur having maximum values of 31.72 m for latitude and 85.2 m for longitude during 15–16 UT. Though 9.5% of the cases start when amplitude scintillation was moderate (0.4 < S4 ≤ 0.6), 32.2% of the cases occurred when phase scintillation was moderate (0.2 < σϕ ≤ 0.7). The percentage of occurrences of moderate amplitude scintillation is 5.07% during 19:00–20:00 UT and does not occur thereafter, whereas the percentage of occurrences of moderate phase scintillations are found to be 18% even during 21:00–22:00 UT. The percentage of occurrences of weak phase scintillations was also higher (49.25%) compared to 1.98% corresponding to amplitude scintillations even at 23:00 UT. Occurrence of phase scintillations on GPS links has not been frequently reported from this longitude sector before, mainly due to nonavailability of appropriate transmissions.

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A deep fading assessment of the modernized L2C and L5 signals for low-latitude regions

et al. 2021

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Interfrequency Performance Characterizations of GPS During Signal Outages From an Anomaly Crest Location

Cited by 10 publications

References 36 publications

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

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

Degradation of Satellite‐Based Navigation Performance Observed From an Anomaly Crest Location in the Indian Longitude Sector

A deep fading assessment of the modernized L2C and L5 signals for low-latitude regions

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