Calibration errors on experimental slant total electron content (TEC) determined with GPS

Ciraolo, L.; Azpilicueta, F.; Brunini, C.; Meza, Amalia; Radicella, S. M.

doi:10.1007/s00190-006-0093-1

Cited by 490 publications

(391 citation statements)

References 17 publications

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“…Note that there is no ambiguity term in code-delay observations and the noise and multipath on carrier-phase measurements has been neglected as described in Braasch (1996). Usually it is assumed that also he P i arc can be disregarded (Braasch 1996;Mannucci et al 1998), but considering the co-located stations' experiment described in Ciraolo et al (2007) it can be noted that this simple assumption does not work in several situations. This empirical evidence suggests maintaining the he P i arc term in the Eq.…”

Section: Tec and Tec Spatial Gradientsmentioning

confidence: 99%

“…A crucial aspect of the data treatment is the calibration of the TEC (i.e. the estimation of the different errors affecting the measurements such as inter-frequency biases, multipath, phase ambiguity and cycle slips), derived from GNSS code and phase carrier delays (Ciraolo et al 2007), as described in Section 2.2. Calibrated TEC measurements are used to obtain the spatial variations of TEC and create maps of calibrated TEC gradients along geographical North-South and East-West directions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum

Cesaroni

Spogli

Alfonsi

et al. 2015

J. Space Weather Space Clim.

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This work presents a contribution to the understanding of the ionospheric triggering of L-band scintillation in the region over São Paulo state in Brazil, under high solar activity. In particular, a climatological analysis of Global Navigation Satellite Systems (GNSS) data acquired in 2012 is presented to highlight the relationship between intensity and variability of the total electron content (TEC) gradients and the occurrence of ionospheric scintillation. The analysis is based on the GNSS data acquired by a dense distribution of receivers and exploits the integration of a dedicated TEC calibration technique into the Ground Based Scintillation Climatology (GBSC), previously developed at the Istituto Nazionale di Geofisica e Vulcanologia. Such integration enables representing the local ionospheric features through climatological maps of calibrated TEC and TEC gradients and of amplitude scintillation occurrence. The disentanglement of the contribution to the TEC variations due to zonal and meridional gradients conveys insight into the relation between the scintillation occurrence and the morphology of the TEC variability. The importance of the information provided by the TEC gradients variability and the role of the meridional TEC gradients in driving scintillation are critically described.

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Section: Tec and Tec Spatial Gradientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum

Cesaroni

Spogli

Alfonsi

et al. 2015

J. Space Weather Space Clim.

View full text Add to dashboard Cite

show abstract

“…However for the purpose of the work, possible cross covariance errors are not considered. Ciraolo et al (2007) investigated the calibration errors on experimental STEC measurements determined by GPS. He found out that the leveling of the carrier to the code measurements is mainly affected by the code multipath.…”

Section: Relationship Between Electron Density Covariance and Stec Mementioning

confidence: 99%

Tomography of the ionospheric electron density with geostatistical inversion

et al. 2015

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Abstract. In relation to satellite applications like global navigation satellite systems (GNSS) and remote sensing, the electron density distribution of the ionosphere has significant influence on trans-ionospheric radio signal propagation. In this paper, we develop a novel ionospheric tomography approach providing the estimation of the electron density's spatial covariance and based on a best linear unbiased estimator of the 3-D electron density. Therefore a non-stationary and anisotropic covariance model is set up and its parameters are determined within a maximum-likelihood approach incorporating GNSS total electron content measurements and the NeQuick model as background. As a first assessment this 3-D simple kriging approach is applied to a part of Europe. We illustrate the estimated covariance model revealing the different correlation lengths in latitude and longitude direction and its non-stationarity. Furthermore, we show promising improvements of the reconstructed electron densities compared to the background model through the validation of the ionosondes Rome, Italy (RO041), and Dourbes, Belgium (DB049), with electron density profiles for 1 day.

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“…Thus the adjustment process reacts sensitive to low elevation rays associated to that sparse geometry and the effects described in section 2 impact the obtained solution. Nevertheless, the differences found in this study are still smaller than other error sources affecting certain approaches in global TEC modeling [Ciraolo et al, 2007]. Moreover the upcoming GNSS systems, like the GLONASS extension and the new GALILEO system, will lead to an increase in the number of observations/epoch what allows to reduce such error sources.…”

Section: Global Maps Of Vertical Total Electron Contentmentioning

confidence: 74%

Effect of the Earth's oblateness on the estimation of global vertical total electron content maps

Hobiger¹,

Kondo²,

Koyama³

et al. 2007

Geophysical Research Letters

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[1] Global Navigation Satellite Systems like the Global Positioning System and the Russian counterpart GLONASS permit the estimation of ionosphere parameters in the form of vertical total electron content (vTEC) values. Although the GNSS reference systems are rotation-symmetric ellipsoids, simple approximations of gravitational equipotential surfaces, the modeling of global vTEC maps is carried out in spherical systems, since this simplifies mathematical expressions. Due to the Earth's oblateness this approximation is in slight disagreement to the geometric situation of the observations. Thus it is expected that estimated vTEC values will change when the WGS84 ellipsoid is taken as a reference for all computations. We will discuss both, the direct effect (i.e due to a shift of the ionospheric pierce point) and the indirect effect, caused by a change of the mapping function, on global vTEC values using a single layer model of the ionosphere. We show that the estimated global TEC maps change slightly by up to ±0.4 TECU when refined mathematical models are considered and we discuss how differential code biases are affected by this change. Citation: Hobiger, T., T. Kondo, Y. Koyama, R. Ichikawa, and R. Weber (2007), Effect of the Earth's oblateness on the estimation of global vertical total electron content maps, Geophys. Res. Lett., 34, L11113,

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Calibration errors on experimental slant total electron content (TEC) determined with GPS

Cited by 490 publications

References 17 publications

L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum

L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum

Tomography of the ionospheric electron density with geostatistical inversion

Effect of the Earth's oblateness on the estimation of global vertical total electron content maps

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