Impacts of ionospheric scintillations on GPS receivers intended for equatorial aviation applications

Akala, A. O.; Doherty, Patricia H.; Carrano, Charles S.; Valladares, C. E.; Groves, K. M.

doi:10.1029/2012rs004995

Cited by 49 publications

(37 citation statements)

References 36 publications

(57 reference statements)

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“…The probability distributions of signal intensity measurements do not reflect the timing relationship of the signal fading on three GPS bands as highlighted in Figure 1, where L1, L2C, and L5 signals fade at different times with different durations. Previous research studied signal fading characteristics using C/N 0 measurements [21][22][23]. However, as pointed out in [26] and illustrated in Figure 10, C/N 0 under-estimates the scintillation signal fading level and drastically over-estimates fading duration, mainly due to the averaging operation over an extended time period in its calculation.…”

Section: Multi-band Fading Characteristics On Signal Intensitymentioning

confidence: 99%

Equatorial Scintillation Amplitude Fading Characteristics Across the GPS Frequency Bands

Jiao

Morton

et al. 2016

J Inst Navig

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Deep signal fading during ionospheric scintillation possesses a threat to GNSS signal tracking and degrades position, navigation, and timing solution accuracy. Understanding the physics and the characteristics of the signal fading is a pre‐requisite to developing robust scintillation mitigation techniques for assured navigation and for utilizing GNSS signals for ionosphere and space weather studies. In this paper, intermediate frequency GPS data collected on Ascension Island in March 2013 are processed to enable comparison with phase screen theory prediction through spectral and spatial coherence analysis of the measured strong scintillation signals. In addition, signal fading level, duration, and inter‐fading time distributions are obtained from the data to establish statistical relationships of fading properties across the three GPS bands. The results show that simultaneous deep fading on all three GPS bands rarely occurs, suggesting that robust carrier tracking during equatorial ionospheric scintillation can be achieved using inter‐frequency aiding. Copyright © 2016 Institute of Navigation

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Section: Multi-band Fading Characteristics On Signal Intensitymentioning

confidence: 99%

Equatorial Scintillation Amplitude Fading Characteristics Across the GPS Frequency Bands

Jiao

Morton

et al. 2016

J Inst Navig

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“…The equatorial and low-latitude ionosphere manifests a number of unique phenomena, such as the equatorial electrojet (EEJ), equatorial spread F (ESF), equatorial plasma bubble (EPB), and equatorial ionization anomaly (EIA) among others, and is characterized by large transient variations (Bagiya et al, 2009;Mukherjee et al, 2010;Chauhan et al, 2011;Bolaji et al, 2012). The equatorial ionosphere is highly dynamic and consequently poses serious threats to communication and navigation systems (Akala et al, 2010(Akala et al, , 2011(Akala et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria

et al. 2017

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Abstract. The study of diurnal and seasonal variations in total electron content (TEC) over Nigeria has been prompted by the recent increase in the number of GPS continuously operating reference stations (CORSs) across Nigeria as well as the reduced costs of microcomputing. The GPS data engaged in this study were recorded in the year 2012 at nine stations in Nigeria located between geomagnetic latitudes -4.33 and 0.72 • N. The GPS data were used to derive GPS TEC, which was analysed for diurnal and seasonal variations. The results obtained were used to produce local GPS TEC maps and bar charts. The derived GPS TEC across all the stations demonstrates consistent minimum diurnal variations during the pre-sunrise hours 04:00 to 06:00 LT, increases with sharp gradient during the sunrise period (∼ 07:00 to 09:00 LT), attains postnoon maximum at about 14:00 LT, and then falls to a minimum just before sunset. Generally, daytime variations are found to be greater than nighttime variations, which range between 0 and 5 TECU. The seasonal variation depicts a semi-annual distribution with higher values (∼ 25-30 TECU) around equinoxes and lower values (∼ 20-25 TECU) around solstices. The December Solstice magnitude is slightly higher than the June Solstice magnitude at all stations, while March Equinox magnitude is also slightly higher than September Equinox magnitude at all stations. Thus, the seasonal variation shows an asymmetry in equinoxes and solstices, with the month of October displaying the highest values of GPS TEC across the latitudes.

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“…The most intense scintillation over these latitudes is associated with the crests of the EIA [ Aarons et al , ; Basu et al , ]. Scintillation can impair the GNSS receiver signal tracking performance thereby leading to a degradation in the positioning accuracy [ Aquino et al , ; Krankowski and Shagimuratov , ; Aquino et al , ; Akala et al , ; Sreeja et al, ].…”

Section: Introductionmentioning

confidence: 99%

Performance of ionospheric maps in support of long baseline GNSS kinematic positioning at low latitudes

et al. 2016

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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 globe, where the ionosphere behaves very unpredictably, with strong scintillation frequently occurring in the local postsunset hours. The correlation between scintillation occurrence and sharp variations in the ionospheric total electron content (TEC) in Brazil is demonstrated in Spogli et al. (2013). The compounded effect of these associated ionospheric disturbances on long baseline GNSS kinematic positioning is studied in this paper, in particular when ionospheric maps are used to aid the positioning solution. The experiments have been conducted using data from GNSS reference stations in Brazil. The use of a regional TEC map generated under the CALIBRA (Countering GNSS high-Accuracy applications Limitations due to Ionospheric disturbances in BRAzil) project, referred to as CALIBRA TEC map (CTM), was compared to the use of the Global Ionosphere Map (GIM), provided by the International GNSS Service (IGS). Results show that the use of the CTM greatly improves the kinematic positioning solution as compared with that using the GIM, especially under disturbed ionospheric conditions. Additionally, different hypotheses were tested regarding the precision of the TEC values obtained from ionospheric maps, and its effect on the long baseline kinematic solution evaluated. Finally, this study compares two interpolation methods for ionospheric maps, namely, the Inverse Distance Weight and the Natural Neighbor.

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Impacts of ionospheric scintillations on GPS receivers intended for equatorial aviation applications

Cited by 49 publications

References 36 publications

Equatorial Scintillation Amplitude Fading Characteristics Across the GPS Frequency Bands

Equatorial Scintillation Amplitude Fading Characteristics Across the GPS Frequency Bands

Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria

Performance of ionospheric maps in support of long baseline GNSS kinematic positioning at low latitudes

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