The New Vienna VLBI Software VieVS

Böhm, Johannes; Böhm, Sigrid; Nilsson, Tobias; Pany, A.; Plank, Lucia; Spicakova, H.; Teke, Kamil; Schuh, Harald

doi:10.1007/978-3-642-20338-1_126

Cited by 77 publications

(46 citation statements)

References 4 publications

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“…Various studies have illustrated that VLBI is capable of determining accurate tropospheric delays as well as water vapor content in the vicinity of the VLBI stations (Heinkelmann et al 2007;Schuh and Böhm 2012). Since GNSS and VLBI observations are subject to the same type of errors in terms of the atmospheric effect, tropospheric parameter derived from VLBI provide an excellent basis for the comparison and validation of parameters retrieved by GNSS, which has been shown by many authors (Teke et al 2011;Ning et al 2012 Comparable to the GNSS, the GMF are used as hydrostatic and wet mapping functions, and the elevation cut-off angle is set to 5°.…”

Section: Vlbi Datamentioning

confidence: 99%

Estimation and evaluation of real-time precipitable water vapor from GLONASS and GPS

et al. 2015

GPS Solut

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Abstract:The revitalized Russian GLONASS system provides new potential for real-time retrieval of zenith tropospheric delays (ZTD) and precipitable water vapor (PWV) in order to support time-critical meteorological applications such as nowcasting or severe weather event monitoring. In this study, we develop a method of real-time ZTD/PWV retrieval based on GLONASS and/or GPS observations. The performance of ZTD and PWV derived from GLONASS data using real-time precise point positioning (PPP) technique is carefully investigated and evaluated. The potential of combining GLONASS and GPS data for ZTD/PWV retrieving is assessed as well. The GLONASS and GPS observations of about half a year for 80 globally distributed stations from the IGS (International GNSS Service) network are processed. The results show that the real-time GLONASS ZTD series agree quite well with the GPS ZTD series in general: the RMS of ZTD differences are about 8 mm (about 1.2 mm in PWV). Furthermore, for an inter-technique validation, the real-time ZTD estimated from GLONASS-only, GPS-only, and the GPS/GLONASS combined solutions are compared with those derived from Very Long Baseline Interferometry (VLBI) at co-located GNSS/VLBI stations. The comparison shows that GLONASS can contribute to real-time meteorological applications, with almost the same accuracy as GPS. More accurate and reliable water vapor values, about 1.5-2.3 mm in PWV, can be achieved when GLONASS observations are combined with the GPS ones in the real-time PPP data processing. The comparison with radiosonde data further confirms the performance of GLONASS-derived real-time PWV and the benefit of adding GLONASS to stand-alone GPS processing.

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Section: Vlbi Datamentioning

confidence: 99%

Estimation and evaluation of real-time precipitable water vapor from GLONASS and GPS

et al. 2015

GPS Solut

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“…In this research we have developed a new empirical FCN model with higher temporal resolution by fitting M a n u s c r i p t the amplitude parameters directly to the Very Long Baseline Interferometry (VLBI) solution calculated with the GeoForschungsZentrum (GFZ) version (Nilsson et al, 2015) of the Vienna VLBI Software (VieVS) (Böhm et al, 2012). A comparison with other recently determined empirical FCN models: Malkin (2013), Krásná et al (2013) and Lambert and Dehant (2007) was included by means of the weight root mean square (WRMS) of the residuals during the entire period of VLBI data.…”

Section: Introductionmentioning

confidence: 99%

Testing a new Free Core Nutation empirical model

Belda

Ferrándiz

Heinkelmann

et al. 2016

Journal of Geodynamics

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The Free Core Nutation (FCN) is a free mode of the Earth's rotation caused by the different material characteristics of the Earth's core and mantle. This causes the rotational axes of those layers to slightly diverge from each other, resulting in a wobble of the Earth's rotation axis comparable to nutations. In this paper we focus on estimating empirical FCN models using the observed nutations derived from the VLBI sessions between 1993 and 2013. Assuming a fixed value for the oscillation period, the time-variable amplitudes and phases are estimated by means of multiple sliding window analyses. The effects of using different a priori Earth Rotation Parameters (ERP) in the derivation of models are also addressed. The optimal choice of the fundamental parameters of the model, namely the window width and step-size of its shift, is searched by performing a thorough experimental analysis using real data. The former analyses lead to the derivation of a model with a temporal resolution higher than the one used in the models currently available, with a sliding window reduced to 400 days and a day by day shift. It is shown that this new model increases the accuracy of the modeling of the observed Earth's rotation. Besides, empirical models determined from USNO Finals as a priori ERP present a slightly lower Weighted Root Mean Square (WRMS) of residuals than IERS 08 C04 along the whole period of VLBI observations, according to our computations. The model is also validated through comparisons with other recognized models. The level of agreement among them is satisfactory. Let us remark that our estimates give rise to the lowest residuals and seem to reproduce the FCN signal in more detail.

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“…Because of their regularity and timeliness in correlation and analysis, these sessions constitute the majority of the IVS data and heavily contribute to its main products: the terrestrial reference frame, the Earth orientation parameters and the CRF. The Vienna VLBI Software (VieVS; Böhm et al 2012) allows us to simulate and analyse these observations. In geodetic/astrometric analysis (e.g.…”

Section: S I M U L At I O N M E T H O Dmentioning

confidence: 99%

On the estimation of a celestial reference frame in the presence of source structure

Plank

Shabala

McCallum

et al. 2015

Mon. Not. R. Astron. Soc.

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The spatial structure of sources making up the celestial reference frame (CRF) at radio frequencies is a systematic error source in very long baseline interferometry (VLBI) measurements. Using simulations, we investigate the effects of source structure on the CRF, determined by the actual observational programme of the International VLBI Service for Geodesy and Astrometry. This is done using the source structure simulator of the Vienna VLBI Software. Applying various mock two-component source models, systematic displacements of 10-80 μas in median source position offsets are found. These offsets are predominantly aligned with the direction of the jet. The simulations further show that slight changes in the source model can significantly change the estimated positions. We finally present a new parametrization of source positions in the analysis, namely along the jet direction and perpendicular to it, allowing us to significantly mitigate the effects of source structure on an estimated CRF.

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The New Vienna VLBI Software VieVS

Cited by 77 publications

References 4 publications

Estimation and evaluation of real-time precipitable water vapor from GLONASS and GPS

Estimation and evaluation of real-time precipitable water vapor from GLONASS and GPS

Testing a new Free Core Nutation empirical model

On the estimation of a celestial reference frame in the presence of source structure

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