Feasibility of precise navigation in high and low latitude regions under scintillation conditions

Zornoza, José Miguel Juan; Sanz, J.; González-Casado, Guillermo; Camps, Adriano; Riba, Jordi-Roger; Barbosa, José; Blanch, Estefanía; Altadill, D.; Orús, R.

doi:10.1051/swsc/2017047

Cited by 35 publications

(27 citation statements)

References 18 publications

(32 reference statements)

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“…Except the ROTI index, we also show an alternative amplitude index S 4 derived from GPS C / N 0 measurements with 1‐s interval in this study. The availability of this index was confirmed by Juan et al (). The calculation of the S 4 can be expressed as (van Dierendonck et al, )

S_{4} = \sqrt{\frac{⟨{({SI}_{detrended}^{S / N_{0}})}^{2}⟩ - {(⟨⟩, {SI}_{detrended}^{S / N_{0}})}^{2}}{{⟨{SI}_{detrended}^{S / N_{0}}⟩}^{2}}}

where the

{SI}_{detrended}^{S / N_{0}}

represents the detrended signal intensity (SI) based on signal‐to‐noise ratio ( S / N 0 ).…”

Section: Methodsmentioning

confidence: 64%

“…Except the ROTI index, we also show an alternative amplitude index S 4 derived from GPS C/N 0 measurements with 1-s interval in this study. The availability of this index was confirmed by Juan et al (2018). The calculation of the S 4 can be expressed as (van Dierendonck et al, 1993)…”

Section: Ionospheric Scintillation Indexesmentioning

confidence: 90%

“…The most common one is the rate of total electron content (TEC) index (ROTI) based on GNSS dual‐frequency carrier phase measurements. On the other hand, few studies have shown that the amplitude scintillation index S 4 can also be derived from carrier‐to‐noise ratio ( C / N 0 ) measurements released by common GNSS receivers (e.g., Juan et al, ). Using these indexes, especially derived from common GNSS receivers, to study the conjugacy of EPIs is still very limited.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geomagnetically Conjugate Observations of Equatorial Plasma Irregularities From Swarm Constellation and Ground‐Based GPS Stations

Luo

Xiong

et al. 2019

JGR Space Physics

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The near‐polar orbit satellites of Swarm mission provide a good opportunity to investigate the conjugacy of equatorial plasma irregularities (EPIs) since their trajectories at low latitudes are basically aligned with fixed geographical longitude. However, the Swarm in situ electron density occasionally shows EPIs at only one hemisphere at this longitude. In this study, we provide detailed analysis of such EPI events from the in situ electron densities and onboard global positioning system (GPS) measurements of Swarm low pair satellites, and simultaneous GPS data from two geomagnetically conjugate ground stations at the Africa longitudes. The result indicates that when Swam in situ electron density sometime shows EPIs at only one hemisphere, the GPS scintillations are still observed from the Swarm onboard receiver and by the two conjugate ground stations. It implies that the EPIs should generally elongate along the geomagnetic flux tube. More than two‐year statistic results show that the onset time of scintillation in the northern station is on average 16 and 18 min earlier than that in the southern station for September equinox and December solstice in 2015, while for March equinox in 2016 the onset time of scintillation of northern station is about 11 min later than that of southern station, which indicates the asymmetry features of EPIs along the flux tube. Further analysis of nearly three‐year GPS data from two conjugate stations at the Asia longitudes, we find that during solar maximum years the local sunset time plays an important role for causing the difference of onset time of scintillation between two conjugate stations.

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S_{4} = \sqrt{\frac{⟨{({SI}_{detrended}^{S / N_{0}})}^{2}⟩ - {(⟨⟩, {SI}_{detrended}^{S / N_{0}})}^{2}}{{⟨{SI}_{detrended}^{S / N_{0}}⟩}^{2}}}

where the

{SI}_{detrended}^{S / N_{0}}

represents the detrended signal intensity (SI) based on signal‐to‐noise ratio ( S / N 0 ).…”

Section: Methodsmentioning

confidence: 64%

Section: Ionospheric Scintillation Indexesmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geomagnetically Conjugate Observations of Equatorial Plasma Irregularities From Swarm Constellation and Ground‐Based GPS Stations

Luo

Xiong

et al. 2019

JGR Space Physics

View full text Add to dashboard Cite

show abstract

“…The S 4 index is not used to identify the scintillation event because the value of S 4 derived from common geodetic GNSS receivers (30 s interval) is generally smaller than that released by the dedicated ISMRs. Specifically, the largest S 4 values close to 1 show an underestimation of around 10% compared with those from ISMRs [25]. The S 4 shown in this study is only used to display the relevant amplitude scintillation information due to the absence of BDS amplitude scintillation data from ISMRs.…”

Section: Ionospheric Scintillation Indicesmentioning

confidence: 96%

“…Currently, mitigation strategies mainly include suitable stochastic model [18,22,23] and robust data pre-processing method [24,25]. The suitable stochastic model is also called receiver tracking model [18,26].…”

Section: Introductionmentioning

confidence: 99%

A Strategy to Mitigate the Ionospheric Scintillation Effects on BDS Precise Point Positioning: Cycle-Slip Threshold Model

Luo¹,

Lou²,

Gu³

et al. 2019

Remote Sensing

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Because of the special design of BeiDou navigation satellite system (BDS) constellation, the effects of ionospheric scintillation on operational BDS generally are more serious than on the global positioning system (GPS). As BDS is currently providing global services, it is increasingly important to seek strategies to mitigate the scintillation effects on BDS navigation and positioning services. In this study, an improved cycle-slip threshold model is proposed to decrease the high false-alarm rate of cycle-slips under scintillation conditions, thus avoiding the frequent unnecessary ambiguity resets in BDS precise point positioning (PPP) solution. We use one-year (from 23 March 2015 to 23 March 2016) BDS dataset from Hong Kong Sha Tin (HKST) station (22.4°N, 114.2°E; geomagnetic latitude: 15.4°N) to model the cycle-slip threshold and try to make it suitable for three types of BDS satellites and multiple scintillation levels. The availability of our mitigation strategy is validated by using three months (from 1 September 2015 to 30 November 2015) BDS dataset collected at 10 global navigation satellite system (GNSS) stations in Hong Kong. Positioning results demonstrate that our mitigated BDS PPP can prevent the sudden fluctuations of positioning errors induced by the ionospheric scintillation. Statistical results of BDS PPP experiments show that the mitigated solution can maintain an accuracy of about 0.08 m and 0.10 m in the horizontal and vertical components, respectively. Compared with standard BDS PPP, the accuracy of mitigated PPP can be improved by approximately 24.1%, 38.2%, and 47.9% in the east, north, and up directions, respectively. Our study demonstrates that considering different scintillation levels to establish appropriate cycle-slip threshold model in PPP processing can efficiently mitigate the ionospheric scintillation effects on BDS PPP.

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Network‐based ionospheric gradient monitoring to support GBAS

et al. 2021

Self Cite

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Large ionospheric gradients acting between a Ground Based Augmentation System (GBAS) reference station and an aircraft on approach could lead to hazardous position errors if undetected. Current GBAS stations provide solutions against this threat that rely on the use of “worst‐case” conservative threat models, which could limit the availability of the system. This paper presents a methodology capable of detecting ionospheric gradients in real time and estimating the actual threat model parameters based on a network of dual‐frequency and multi‐constellation GNSS monitoring stations. First, we evaluate the performance of our algorithm with synthetic gradients that are simulated over the nominal measurements recorded by a reference network in Alaska. Afterwards, we also assess it with one real ionospheric gradient measured by the same network. Results with both simulated gradients and a real gradient show the potential to support GBAS by detecting and estimating these gradients instead of always using “worst‐case” models.

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Feasibility of precise navigation in high and low latitude regions under scintillation conditions

Cited by 35 publications

References 18 publications

Geomagnetically Conjugate Observations of Equatorial Plasma Irregularities From Swarm Constellation and Ground‐Based GPS Stations

Geomagnetically Conjugate Observations of Equatorial Plasma Irregularities From Swarm Constellation and Ground‐Based GPS Stations

A Strategy to Mitigate the Ionospheric Scintillation Effects on BDS Precise Point Positioning: Cycle-Slip Threshold Model

Network‐based ionospheric gradient monitoring to support GBAS

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