Equatorial Scintillation Amplitude Fading Characteristics Across the GPS Frequency Bands

Jiao, Yu; Xu, Dongyang; Morton, Yu; Rino, C. L.

doi:10.1002/navi.146

Cited by 43 publications

(41 citation statements)

References 30 publications

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“…A fading model used by the above workers has verified the degraded performance of new L2C and L5 signals with respect to L1 signal. Jiao et al () reported L5 to have smaller tendency toward number of fades compared to L1 and L2C signal during the same period of scintillation and a decreased correlation between the GPS frequencies during strong scintillation. In the present work, effort has been made to compare L1 C/A signal with L2C and L5 signals in terms of loss of lock and cycle slips.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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Introduction of new navigation signals L2C (1227.60 MHz) and L5 (1176.45 MHz) to the existing GPS (Global Positioning System) spectrum, under the modernization program of GPS offers the improvement of position accuracy. The present study aims to understand the relative robustness of the L2C and L5 signals compared to legacy L1 C/A signal during periods of scintillations in terms of durations of cycle slips encountered from an anomaly crest location, Calcutta (22.58°N, 88.38°E geographic; magnetic dip 32°N). The data analyzed in this study were recorded during the vernal equinox of 2014 (February–April), a period of high solar activity of cycle 24. Results obtained from the comparative analyses, which are perhaps one of the first from the Indian longitude sector, indicate GPS L5 to be more robust than L1 C/A and L2C in terms of occurrence and duration of cycle slips under adverse ionospheric conditions. Furthermore, loss‐of‐lock events of duration greater than 6 s are found to be more frequent for S4 ≥ 0.6. It is found that frequency sensitivity of the GPS spectrum, in terms of occurrence of cycle slips and loss of locks are in conformity with earlier results from the equatorial region but are different from the high latitudes with respect to local time of occurrence and geomagnetic activity.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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“…Strong equatorial scintillation is known to degrade receiver carrier tracking performance, causing measurement error, cycle slips, and even loss of lock signals Seo et al 2009). In the real data analysis presented in our previous publications (Jiao et al 2016;Myer and Morton 2018), cycle slips and loss of lock are frequently observed in commercial receivers in the equatorial region, some of which can last more than 2 h.…”

Section: Introductionmentioning

confidence: 92%

“…In recent years, the availability of massive scintillation measurement data has led to numerous studies focused on the temporal and spectral characteristics of the scintillation signal amplitude and phase (Seo et al 2009(Seo et al , 2011Oliveira et al 2014;Jiao et al 2016). This work will focus on the navigation message bit decoding error (BDE) during strong equatorial scintillation.…”

Section: Introductionmentioning

confidence: 99%

GPS navigation data bit decoding error during strong equatorial scintillation

Morton

2018

GPS Solut

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Strong equatorial scintillation is often characterized by simultaneous fast phase changes and deep amplitude fading. The combined effect poses a challenge for GNSS receiver carrier tracking performance. One of the consequences of the strong scintillation is increased navigation message data bit decoding error. Understanding the rate of the data bit decoding error under equatorial scintillation is essential for high accuracy and high integrity applications. We present the statistical relationship between the data bit decoding error occurrences and the intensity of amplitude scintillation based on the processing of intermediate frequency GPS scintillation data collected on Ascension Island in March 2013. A third-order phase lock loop (PLL) is implemented to process the data and to access the data bit error typically expected in conventional receivers. A Kalman filter-based PLL is also used to process the same data to demonstrate that the data bit decoding error can be reduced through advanced carrier tracking designs.

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“…A number of recent studies have provided empirical evidence that the phase scintillation exhibits a high degree of correlation between different GNSS frequencies, including L1, L2 and L5. It has been suggested that this correlation persists except in the case of strong amplitude scintillation, when deep amplitude fades occur (Sokolova et al, 2015;Carrano et al, 2012;Jiao et al, 2016). This implies that even when strong phase scintillation is observed, which is not uncommon at high latitudes, these variations in the carrier will be correlated across frequencies.…”

Section: Ionospheric Scintillationmentioning

confidence: 98%

“…The Cornell Scintillation Model (CSM) (Humphreys et al, , 2010, a popular synthetic signal simulator that generates scintillation amplitude and phase traces, was used to test the AR-based filtering methodology. Recent studies of real equatorial and highlatitude data have shown that scintillation characteristics are frequency-dependent (Carrano et al, 2012;Sokolova et al, 2015;Jiao et al, 2016). While phase disturbances may be correlated, deep amplitude fades tend to occur at different times on different frequencies, thus motivating the potential performance gain of using inter-frequency aiding and multifrequency architectures.…”

Section: Introductionmentioning

confidence: 99%

Multi-frequency GNSS robust carrier tracking for ionospheric scintillation mitigation

Vilà‐Valls¹,

Closas²,

Curran³

2017

J. Space Weather Space Clim.

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-Ionospheric scintillation is the physical phenomena affecting radio waves propagating from the space through the ionosphere to earth. The signal distortion induced by scintillation can pose a major threat to some GNSS application. Scintillation is one of the more challenging propagation scenarios, particularly affecting high-precision GNSS receivers which require high quality carrier phase measurements; and safety critical applications which have strict accuracy, availability and integrity requirements. Under ionospheric scintillation conditions, GNSS signals are affected by fast amplitude and phase variations, which can compromise the receiver synchronization. To take into account the underlying correlation among different frequency bands, we propose a new multivariate autoregressive model (MAR) for the multi-frequency ionospheric scintillation process. Multi-frequency GNSS observations and the scintillation MAR are modeled in state-space, allowing independent tracking of both line-of-sight phase variations and complex gain scintillation components. The resulting joint synchronization and scintillation mitigation problem is solved using a robust nonlinear Kalman filter, validated using real multi-frequency scintillation data with encouraging results.

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Equatorial Scintillation Amplitude Fading Characteristics Across the GPS Frequency Bands

Cited by 43 publications

References 30 publications

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

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

GPS navigation data bit decoding error during strong equatorial scintillation

Multi-frequency GNSS robust carrier tracking for ionospheric scintillation mitigation

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