A GPS-based method to model the plasma effects in VLBI observations

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dc.creatorRos, E.
dc.creatorMarcaide, J. M.
dc.creatorGuirado, J. C.
dc.creatorSardon, E.
dc.creatorShapiro, I. I.
dc.date2000-01-28
dc.date.accessioned2026-07-07T01:51:56Z
dc.date.available2026-07-07T01:51:56Z
dc.descriptionGlobal Positioning System (GPS) satellites broadcast at frequencies of 1,575.42 MHz (L1) and of 1,227.60 MHz (L2). The dispersive property of the ionosphere can be used to combine independent measurements at the two frequencies to estimate the total electron content (TEC) between a GPS receiver site and a broadcasting satellite. Such measurements, made at sites near to Very Long Baseline Interferometry (VLBI) sites, can be used to estimate the ionospheric contribution to VLBI observables. For our 1991.9 astrometric VLBI experiment in which we obtained group-delay observations in the 8.4 and 2.3 GHz bands simultaneously, we found that the GPS and VLBI determinations of the ionosphere delays agreed with root-mean-square differences below 0.15 ns for intercontinental baselines and 0.10 ns for continental ones. We also successfully applied the GPS-based procedure to reduce the ionospheric effect in phase delays used for high precision differenced astrometry at 8.4 GHz for this same experiment.
dc.descriptionAccepted for publication in Astronomy & Astrophysics, Main Journal, 6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0001503
dc.identifierhttp://arxiv.org/abs/astro-ph/0001503
dc.identifierAstronomy & Astrophysics, 356, 357-362 (2000)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/463
dc.subjectAstrophysics
dc.titleA GPS-based method to model the plasma effects in VLBI observations
dc.typetext

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