ionospheric scintillation

ionospheric scintillation

(ÿ-on-ŏ-sfe -rik) See scattering.
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References in periodicals archive ?
Tsujii, "GBAS availability assessment and modelling of ionospheric scintillation effects," in Proceedings of the ION's Pacific PNT Meeting, Honolulu, Hawaii, USA, April 2015.
Ionospheric scintillation at GNSS frequencies is a phenomenon that typically occurs after sunset and mainly during premidnight hours.
A new GNSS Ionospheric Scintillation and TEC Monitor (GISTM) receiver system from Novatel has been released that integrates the company's powerful OEM628 measurement engine with a high-quality, low-phase-noise, oven-controlled crystal oscillator.
Under the new agreement, which extends present contract arrangements between the two companies, Veripos will provide their PSVs with a combination of its proprietary VERIPOS Standard and Standard2 GNSS data augmentation positioning services, the latter designed to increase the availability of GNSS observations during periods of local masking, ionospheric scintillation or inadequate GPS geometry; both are capable of providing typical accuracies of 1-2 metres over ranges between 1,000km and 2,000km.
NeQuick model has been utilized, among other uses, by the European Geostationary Navigation Overlay Service (EGNOS) project of the European Space Agency for system assessment analysis and has been implemented in the Global Ionospheric Scintillation Model (GISM) to calculate the background ionosphere (Beniguel, 2004).
gradients and ionospheric scintillations) - reproduce small-scale effects such as TIDs or depletions and other disturbances - understand better the effects of geomagnetic storms in the ionosphere - adapt to changes in geomagnetic field and solar cycle - improve prediction and forecasting capabilities for ionospheric effects - understand the effects of such effects on GNSS systems Extensive measurements over solar maximum will be carried out during the MONITOR activity under the GNSS Evolutions Programme and other experiments from external organisations.
For example, monitoring is helpful in distinguishing ionospheric scintillations from a flock of birds roosting on or near a receiving antenna.
In addition to that, the large number of satellites available for navigation will also provide significant benefits in terms of geometric diversity of the satellites and enable good and reliable positioning even in the presence of ionospheric scintillations. For that reason significant work is underway in order to develop and standardize a future GBAS service which supports the use of two frequencies and several constellations in order to mitigate the negative effects on current systems.
MONITOR) able to: - reproduce the effects of the ionosphere in equatorial regions (temporal/spatial gradients and ionospheric scintillations) - reproduce small-scale effects such as TIDs or depletions and other disturbances - understand better the effects of geomagnetic storms in the ionosphere - adapt to changes in geomagnetic field and solar cycle - improve prediction and forecasting capabilities for ionospheric effects - understand the effects of such effects on GNSS systems Extensive measurements over solar maximum will be carried out during the MONITOR activity under the GNSS Evolutions Programme and other experiments from external organisations.