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Assessment of GRAS ionospheric measurements for ionospheric model assimilation
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-15)
Article
Open AccessWe conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products. The ... -
Real-time tomographic inversion of truncated ionospheric GNSS radio occultations
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-19)
Article
Open AccessThis paper presents a new way of combining Abel inversion and the Chapman model with a linearly increasing scale height to retrieve ionospheric electron density vertical profiles from truncated-sounding radio-occultation ... -
Study of ionospheric bending angle and scintillation profiles derived by GNSS radio-occultation with MetOp-A satellite
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-20)
Article
Open AccessIn this work, a dedicated campaign by MetOp-A satellite is conducted to monitor the ionosphere based on radio-occultation (RO) measurements provided by the onboard GNSS (Global Navigation Satellite System) Receiver for ... -
A new method of electron density retrieval from MetOp-A’s truncated radio occultation measurements
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-03)
Article
Open AccessThe radio occultation (RO) measurements of the Global Navigation Satellite System’s (GNSS’s) signals onboard a Low Earth Orbiting (LEO) satellite enable the computation of the vertical electron density profile from the LEO ... -
Pre-earthquake ionospheric anomalies before three major earthquakes by GPS-TEC and GIM-TEC data during 2015–2017
(2019-04-01)
Article
Restricted access - publisher's policyThe dual-frequency satellite-based measurements from Global Positioning System (GPS) may provide feasible ways of studying and potentially detecting of earthquake (EQ) related anomalies in the ionosphere. In this paper, ... -
Ionospheric VTEC variations over Pakistan in the descending phase of solar activity during 2016–17
(2019-06-01)
Article
Restricted access - publisher's policyThis paper presents the variations of the ionospheric Vertical Total Electron Content (VTEC) observed over Pakistan at the verge of low- to mid-latitude regions during the years 2016–17 of the descending phase of the solar ... -
Retrieving geophysical signals from GPS in the La Plata River region
(2019-06-08)
Article
Restricted access - publisher's policyOver the last few years, efforts to model short-term deformations of the Earth’s crust have multiplied. Sudden water level rise can cause sporadic, but significant, motions in the solid Earth’s surface. In this work, we ... -
IGS real-time service for global ionospheric total electron content modeling
(2020-02-18)
Article
Restricted access - publisher's policyBenefiting from global multi-frequency and multi-constellation GNSS measurements provided by the experimental International GNSS real-time service (IGS RTS), a predicting-plus-modeling approach employed by Chinese Academy ... -
High-rate Doppler-aided cycle slip detection and repair method for low-cost single-frequency receivers
(2020-06-08)
Article
Restricted access - publisher's policyCarrier phase cycle slips can be an important source of error in precise Global Navigation Satellite System (GNSS) positioning. In such cases, cycle slips can seriously compromise the positioning accuracy and reliability, ... -
A new way of improving global ionospheric maps by ionospheric tomography: consistent combination of multi-GNSS and multi-space geodetic dual-frequency measurements gathered from vessel-, LEO- and ground-based receivers
(2020-08)
Article
Restricted access - publisher's policyIn this work, we introduce a new way of improving the sligthly best performing global ionospheric model (GIM) within the International GNSS Service, the UQRG produced by UPC-IonSAT with the TOMION dual-layer voxel model ... -
Generation of proxy GIM-TEC for extreme storms before the Era of GNSS observations
(John Wiley & sons, 2022-01)
Article
Open AccessFor the first time, we reconstructed global distribution of both the total electron content disturbance W index and TEC values for eight extreme storms (Dst < -250 nT) occurred before the epoch of GNSS observations in solar ... -
Topside ionospheric tomography exclusively based on LEO POD GPS carrier phases: application to autonomous LEO DCB estimation
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-08)
Article
Open AccessThis paper presents a novel technique to estimate DCBs from GPS transmitters and receivers on-board Low Earth Orbit (LEO) satellites. The technique consists of obtaining the DCBs as residuals from the difference between ...
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