Journal ArticleDOI
Improved amplitude- and phase-scintillation indices derived from wavelet detrended high-latitude GPS data
TLDR
In this article, the performance of a wavelet-based detrending method was evaluated and compared with a new waveletbased detending method using GPS data from high latitudes.Abstract:
Accuracy and validity of scintillation indices estimated using the power and phase of the GPS signal depend heavily on the detrending method used and the selection of the cutoff frequency of the associated filter. A Butterworth filter with a constant cutoff frequency of 0.1 Hz is commonly used in detrending GPS data. In this study, the performance of this commonly used filter is evaluated and compared with a new wavelet-based detrending method using GPS data from high latitudes. It was observed that in detrending high-latitude GPS data, a wavelet filter performed better than Butterworth filters as the correlation between amplitude- and phase-scintillation indices in S 4 and ? ? improved significantly from 0.53, when using a Butterworth filter, to 0.79, when using the wavelet filtering method. We also introduced an improved phase-scintillation index, ? CHAIN, which we think is comparatively a better parameter to represent phase scintillations at high latitudes as the correlation between S 4 and ? CHAIN was as high as 0.90. During the analysis, we also noted that the occurrence of the "phase scintillation without amplitude scintillation" phenomenon was significantly reduced when scintillation indices were derived using the wavelet-based detrending method. These results seem to indicate that wavelet-based detrending is better suited for GPS scintillation signals and also that ? CHAIN is a better parameter for representing GPS phase scintillations at high latitudes.read more
Citations
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Journal ArticleDOI
Characterization of high‐latitude ionospheric scintillation of GPS signals
TL;DR: In this article, a statistical analysis of arctic auroral oval ionospheric scintillation events during the current solar maximum based on high-rate Global Positioning System data collected in Gakona, Alaska (62.39°N, 145.15°W) from August 2010 to March 2013 is presented.
Journal ArticleDOI
A review of GPS/GLONASS studies of the ionospheric response to natural and anthropogenic processes and phenomena
Edward L. Afraimovich,Elvira Astafyeva,V. V. Demyanov,Ilya Edemskiy,Nadezhda S. Gavrilyuk,Artem Ishin,E. A. Kosogorov,L.A. Leonovich,O. S. Lesyuta,K.S. Palamartchouk,N. P. Perevalova,Anna Polyakova,Gennadyi Y. Smolkov,S. V. Voeykov,Yury Yasyukevich,I. V. Zhivetiev +15 more
TL;DR: In this paper, the main results of GPS/GLONASS radio sounding of ionospheric disturbances of natural and anthropogenic origin are presented and a review of studies of ionosphere effects carried out in ISTP SB RAS is presented.
Journal ArticleDOI
Overview of the 2015 St. Patrick's day storm and its consequences for RTK and PPP positioning in Norway
TL;DR: The 2015 St. Patrick's day storm was the first storm of solar cycle 24 to reach a level of "Severe" on the NOAA geomagnetic storm scale as discussed by the authors.
Journal ArticleDOI
Comparison of the effect of high-latitude and equatorial ionospheric scintillation on GPS signals during the maximum of solar cycle 24
TL;DR: In this paper, the authors compared the characteristics of high-latitude and equatorial scintillation using multifrequency GPS data collected at Gakona, Alaska, Jicamarca, Peru, and Ascension Island during the 24th solar maximum.
Journal ArticleDOI
Climatology of GPS phase scintillation and HF radar backscatter for the high-latitude ionosphere under solar minimum conditions
TL;DR: In this article, phase scintillation is associated with auroral arc brightening and substorms or with perturbed cusp ionosphere, while the dayside scintillant patches persist over a large area of the cusp/cleft region sampled by different satellites for several hours.
References
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Journal ArticleDOI
A Practical Guide to Wavelet Analysis.
TL;DR: In this article, a step-by-step guide to wavelet analysis is given, with examples taken from time series of the El Nino-Southern Oscillation (ENSO).
Journal ArticleDOI
GPS and ionospheric scintillations
TL;DR: In this paper, the authors review the impact of scintillations on GPS receiver design and use and present a review of GPS and ionospheric scintillation for scientists interested in space weather.
Ionospheric Effects on GPS
TL;DR: In this paper, the authors describe the major effects of the ionosphere on GPS performance, including the following: 1) group delay of the signal modulation, or absolute range error, 2) carrier phase advance, or relative range error; 3) Doppler shift, or range-rate errors; 4) Faraday rotation of linearly polarized signals; 5) refraction or bending of the radio wave; 6) distortion of pulse waveforms; 7) signal amplitude fading or amplitude scintillation; and 8) phase scintillations.
Ionospheric Scintillation Monitoring Using Commercial Single Frequency C/A Code Receivers
TL;DR: The result is a design of a low-cost, portable Ionospheric Scintillation Monitor (ISM) being developed on a follow-on SBlR Phase II project and testing of a software-modified commercial C/A code receiver to perform this function.