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Ionospheric effects in GNS-reflectometry from space
dc.contributor.author | Camps Carmona, Adriano José |
dc.contributor.author | Hyuk, Park |
dc.contributor.author | Foti, Giuseppe |
dc.contributor.author | Gommenginger, Christine |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions |
dc.date.accessioned | 2017-03-21T11:15:11Z |
dc.date.available | 2017-03-21T11:15:11Z |
dc.date.issued | 2016-12-01 |
dc.identifier.citation | Camps, A., Park, H., Foti, G., Gommenginger, C. Ionospheric effects in GNS-reflectometry from space. "IEEE journal of selected topics in applied earth observations and remote sensing", 1 Desembre 2016, vol. 9, núm. 12, p. 5851-5861. |
dc.identifier.issn | 1939-1404 |
dc.identifier.uri | http://hdl.handle.net/2117/102729 |
dc.description.abstract | Global navigation satellite systems-reflectometry (GNSS-R) is an emerging technique that uses navigation opportunistic signals as a multistatic radar. Most GNSS systems operate at L-band, which is affected by the ionosphere. At present, there is only a GNSS-R space-borne scatterometer on board the UK TechDemoSat-1, but in late 2016, NASA will launch the CYGNSS constellation, and in 2019, ESA will carry out the GEROS experiment on board the International Space Station. In GNSS-R, reflected signals are typically processed in open loop using a short coherent integration time (~1 ms), followed by long incoherent averaging (~1000 times, ~1 s) to increase the signal-to-noise ratio. In this study, the global ionospheric scintillation model is first used to evaluate the total electron content and the scintillation index S4 . The ionospheric scintillation impact is then evaluated as a degradation of the signal-to-noise ratio, which can be used to assess the altimetry and scatterometry performance degradation in a generic GNSS-R mission. Since ionospheric scintillations are mostly produced by a layer of electron density irregularities at ~350 km height, underneath most LEO satellites, but closer to them than to the Earth’s surface, intensity scintillations occur especially in theGNSS transmitter-to-ground transect, therefore, the impact is very similar in conventional and interferometric GNSS-R. Using UK TechDemoSat-1 data, signal-to-noise ratio fluctuations are computed and geo-located, finding that they occur in the open ocean along ~±20° from the geomagnetic equator where S4 exhibits a maximum, and in low wind speed regions, where reflected signals contain a non-negligible coherent component. |
dc.format.extent | 11 p. |
dc.language.iso | eng |
dc.subject | Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció |
dc.subject.lcsh | Global Positioning System |
dc.subject.other | Altimetry |
dc.subject.other | Global navigation satellite systems reflectometry (GNSS-R) |
dc.subject.other | Ionosphere |
dc.subject.other | Scatterometry |
dc.subject.other | Scintillations |
dc.subject.other | Signal-to-noise ratio |
dc.title | Ionospheric effects in GNS-reflectometry from space |
dc.type | Article |
dc.subject.lemac | Sistema de posicionament global |
dc.contributor.group | Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció |
dc.contributor.group | Universitat Politècnica de Catalunya. CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai |
dc.identifier.doi | 10.1109/JSTARS.2016.2612542 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | http://ieeexplore.ieee.org/document/7723820/ |
dc.rights.access | Open Access |
local.identifier.drac | 19789879 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Camps, A.; Park, H.; Foti, G.; Gommenginger, C. |
local.citation.publicationName | IEEE journal of selected topics in applied earth observations and remote sensing |
local.citation.volume | 9 |
local.citation.number | 12 |
local.citation.startingPage | 5851 |
local.citation.endingPage | 5861 |
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