The ionosphere: effects, GPS modeling and the benefits for space geodetic techniques

Hernández‐Pajares, Manuel; Zornoza, José Miguel Juan; Sanz, J.; Aragón‐Àngel, Àngela; García-Rigo, Alberto; Salazar, Dagoberto; Escudero, Miquel

doi:10.1007/s00190-011-0508-5

Cited by 226 publications

(163 citation statements)

References 59 publications

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“…The current maps are only available days later and have a temporal resolution of 2 hours and a spatial resolution of 2.5 x 2.5 degrees, but for the trigger real-time data is required. However, the Space Radio-Diagnostics Research Centre of the University of Warmia and Mazury and the UPC-IonSAT research group of the Technical University of Catalonia are currently developing algorithms to provide real-time high resolution TEC maps, specifically for the ILT (International LOFAR Telescope), using 119 Euref Permanent Network stations [11][12][13]. In the result, near real-time and high-spatial resolution maps are obtained at 15 minutes in temporal resolution and 0.5 degree in latitudinal and longitudinal spatial resolution, (Fig.…”

Section: Ionospheric Correctionsmentioning

confidence: 99%

TEC, Trigger and Check, preparing LOFAR for Lunar observations

et al. 2017

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Abstract. One of the main ways to use radio to detect Ultra High Energy Neutrinos and Cosmic Rays is the Lunar Askaryan technique, that uses the Moon as a target and searches for nanosecond pulses with large radio telescopes. To use low frequency aperture arrays, such as LOFAR and the SKA, pose new challenges and possibilities in detection techniques of short radio pulses and to measure the Total Electron Content (TEC). As a prepatory work, we have used other measurements that use similar techniques, or that can answer a specific question, with the LOFAR radio telescope. This contribution reports on our work on triggering on short radio signals, post-event imaging of radio signals from buffered data and methods to determine the TEC-value.

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Section: Ionospheric Correctionsmentioning

confidence: 99%

TEC, Trigger and Check, preparing LOFAR for Lunar observations

et al. 2017

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“…They also discussed that global navigation satellite system (GNSS) techniques were a powerful tool for monitoring ionospheric perturbations. Hernández-Pajares et al (2011) provided ionospheric monitoring based on GNSS measurements and assessed TIDs, solar flares, ionospheric storms and scintillation. Habarulema et al (2013) estimated the propagation characteristics of large-scale TIDs (LSTIDs) during geomagnetic storm, and showed that disturbances were mostly propagating nearly equatorward.…”

Section: Introductionmentioning

confidence: 99%

Study of ionospheric disturbances over the China mid- and low-latitude region with GPS observations

Ning

Tanida

2018

Ann. Geophys.

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Abstract. Ionospheric disturbances constitute the main restriction factor for precise positioning techniques based on global positioning system (GPS) measurements. Simultaneously, GPS observations are widely used to determine ionospheric disturbances with total electron content (TEC). In this paper, we present an analysis of ionospheric disturbances over China mid-and low-latitude area before and during the magnetic storm on 17 March 2015. The work analyses the variation of magnetic indices, the amplitude of ionospheric irregularities observed with four arrays of GPS stations and the influence of geomagnetic storm on GPS positioning. The results show that significant ionospheric TEC disturbances occurred between 10:30 and 12:00 UT during the main phase of the large storm, and the static position reliability for this period are little affected by these disturbances. It is observed that the positive and negative disturbances propagate southward along the meridian from mid-latitude to low-latitude regions. The propagation velocity is from about 200 to 700 m s −1 and the amplitude of ionospheric disturbances is from about 0.2 to 0.9 TECU min −1 . Moreover, the position dilution of precession (PDOP) with static precise point positioning (PPP) on storm and quiet days is 1.8 and 0.9 cm, respectively. This study is based on the analysis of ionospheric variability with differential rate of vertical TEC (DROVT) and impact of ionospheric storm on positioning with technique of GPS PPP.

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“…These global ionospheric maps are computed using Total Electron Content (TEC) data provided by GNSSbased ground receivers (Hernández-Pajares et al 2011). Due to the lack of homogeneity of the GNSS networks worldwide, interpolation techniques are used for filling the gaps (Orus et al 2005 and citations therein).…”

Section: Introductionmentioning

confidence: 99%

“…For example, for radio-telescope networks, it is important to provide ionospheric information in real time within the area of coverage. In this regard, tomographic models can estimate the state of the ionosphere in real time (Hernán-dez-Pajares et al 2000, 2011.…”

Section: Introductionmentioning

confidence: 99%

Sibsonian and non-Sibsonian natural neighbour interpolation of the total electron content value

et al. 2017

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In radioastronomy the interferometric measurement between radiotelescopes located relatively close to each other helps removing ionospheric effects. Unfortunately, in case of networks such as LOw Frequency ARray (LOFAR), due to long baselines (currently up to 1500 km), interferometric methods fail to provide sufficiently accurate ionosphere delay corrections. Practically it means that systems such as LOFAR need external ionosphere information, coming from Global or Regional Ionospheric Maps (GIMs or RIMs, respectively). Thanks to the technology based on Global Navigation Satellite Systems (GNSS), the scientific community is provided with ionosphere sounding virtually worldwide. In this paper we compare several interpolation methods for RIMs computation based on scattered Vertical Total Electron Content measurements located on one thin ionospheric layer (Ionospheric Pierce Points-IPPs). The results of this work show that methods that take into account the topology of the data distribution (e.g., natural neighbour interpolation) perform better than those based on geometric computation only (e.g., distanceweighted methods).

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The ionosphere: effects, GPS modeling and the benefits for space geodetic techniques

Cited by 226 publications

References 59 publications

TEC, Trigger and Check, preparing LOFAR for Lunar observations

TEC, Trigger and Check, preparing LOFAR for Lunar observations

Study of ionospheric disturbances over the China mid- and low-latitude region with GPS observations

Sibsonian and non-Sibsonian natural neighbour interpolation of the total electron content value

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