GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares

Nina, Aleksandra; Nico, Giovanni; Odalović, Oleg; Čadež, V. M.; Drakul, Miljana Todorovic; Radovanović, Milan

doi:10.1109/lgrs.2019.2941643

Cited by 14 publications

(19 citation statements)

References 23 publications

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“…In addition to periodical ionospheric changes, which can be predicted and estimated by different models (see, for example, [1,2] and references therein), sudden events can induce significant ionospheric disturbances and affect many contemporary technologies based on satellite and ground-based electromagnetic (EM) signal propagation [3]. Consequently, variations of the recorded EM signal properties can be used for detections and analyses of influences of many phenomena on this atmospheric layer including processes which induce different kinds of natural disasters [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Reduction of the VLF Signal Phase Noise Before Earthquakes

et al. 2021

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In this paper we analyse temporal variations of the phase of a very low frequency (VLF) signal, used for the lower ionosphere monitoring, in periods around four earthquakes (EQs) with magnitude greater than 4. We provide two analyses in time and frequency domains. First, we analyse time evolution of the phase noise. And second, we examine variations of the frequency spectrum using Fast Fourier Transform (FFT) in order to detect hydrodynamic wave excitations and attenuations. This study follows a previous investigation which indicated the noise amplitude reduction, and excitations and attenuations of the hydrodynamic waves less than one hour before the considered EQ events as a new potential ionospheric precursors of earthquakes. We analyse the phase of the ICV VLF transmitter signal emitted in Italy recorded in Serbia in time periods around four earthquakes occurred on 3, 4 and 9 November 2010 which are the most intensive earthquakes analysed in the previous study. The obtained results indicate very similar changes in the noise of phase and amplitude, and show an agreement in recorded acoustic wave excitations. However, properties in the obtained wave attenuation characteristics are different for these two signal parameters.

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Section: Introductionmentioning

confidence: 99%

Reduction of the VLF Signal Phase Noise Before Earthquakes

et al. 2021

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“…where e, m, ε 0 represent the electric quantity, electronic mass and dielectric constant respectively. Then, the electron density profile of the corresponding height at Hth layer N(H) can be expressed as Equation (27) [36]…”

Section: Mesospheric Soundingmentioning

confidence: 99%

“…Masato Furuya detected midlatitude Sporadic-E (Es) relaying on the interferometric synthetic aperture radar (InSAR) in 2017, which clarified the spatial structure with unprecedented resolution [26]. Nina et al also investigated the influence of the perturbed (by a solar X-ray flare) ionospheric D-region on the global navigation satellite systems (GNSS) and synthetic aperture radar (SAR) signals in 2019 [27]. Although the observation range is large in this way, the establishment of satellite networks is difficult.…”

Section: Introductionmentioning

confidence: 99%

Design of Multifunctional Mesosphere-Ionosphere Sounding System and Preliminary Results

Liu

Yang

Zhao

et al. 2020

Sensors

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This paper describes a novel sounding system for which the functions of the medium frequency (MF) radar and the ionosonde are integrated on the same hardware platform and antenna structure, namely the middle atmosphere-ionosphere (MAI) system. Unlike the common MF radar, MAI system adopts the pseudo-random (PRN) phase-coded modulation technology, which breaks the limitation of the traditional monopulse mode. Through the pulse compression, only a small peak power is needed to achieve the signal-to-noise ratio (SNR) requirement. The excellent anti-jamming performance is also very suitable for the ionospheric sounding. One transmitting and six receiving modes are adopted for the MF sounding. While neglecting the structure of the T/R switches, the coupling interference between the transmitter and the receiver may also be avoided. Moreover, by employing a miniaturized antenna array composed of progressive-wave antennas for the MF receiving and ionospheric sounding, the MAI system takes account of the requirements of the inversion algorithms of MF radar and the large bandwidth need for the ionospheric sounding concurrently. Such an antenna structure can also greatly simplify the system structure and minimize the difficulty of deployment. The experiments verified the availability of the system scheme and its engineering application significance. Through further analysis of the sounding data, the wind field of the mesosphere, the electron density of D layer and electron density profile from layers E to F were obtained at the identical location. The capability of MAI system can play an important role in studying the interaction and coupling mechanism between the mesosphere and ionosphere.

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“…Advanced studies are carried out by using space-borne exploration techniques like ionosondes, LiDAR, radio waves [17]. The geomagnetic field of the upper atmosphere, the ionospheric plasma and the GPS signal propagation in line of sight from explorer satellite to the GPS vehicle were studied in, for example, the ESA Swarm mission [18].…”

Section: Introductionmentioning

confidence: 99%

Extreme Solar Events’ Impact on GPS Positioning Results

2021

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The main objective of the present study is to perform an analysis of the space weather impact on the Latvian CORS (Continuously Operating GNSS (Global Navigation Satellite System) Stations) GPS (Global Positioning System) observations, in situations of geomagnetic storms, sun flares and extreme TEC (Total Electron Content) and ROTI (Rate of change of TEC index) levels, by analyzing the results, i.e., 90-second kinematic post-processing solutions, obtained using Bernese GNSS Software v5.2. To complete this study, the 90-second kinematic time series of all the Latvian CORS for the period from 2007 to 2017 were analyzed, and a correlation between time series outliers (hereinafter referred to as faults) and extreme space weather events was sought. Over 36 million position determination solutions were examined, 0.6% of the solutions appear to be erroneous, 0.13% of the solutions have errors greater than 1 m, 0.05% have errors greater than 10 m, and 0.01% of the solutions show errors greater than 50 meters. The correlation between faulty results, TEC and ROTI levels and Bernese GNSS Software v5.2 detected cycle slips was computed. This also includes an analysis of fault distribution depending on the geomagnetic latitude as well as faults distribution simultaneously occurring in some stations, etc. This work is the statistical analysis of the Latvian CORS security, mainly focusing on geomagnetic extreme events and ionospheric scintillations in the region of Latvia, with a latitude around 57° N.

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GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares

Cited by 14 publications

References 23 publications

Reduction of the VLF Signal Phase Noise Before Earthquakes

Reduction of the VLF Signal Phase Noise Before Earthquakes

Design of Multifunctional Mesosphere-Ionosphere Sounding System and Preliminary Results

Extreme Solar Events’ Impact on GPS Positioning Results

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