Indirect approach to invariant point determination for SLR and VLBI systems: an assessment

Dawson, John; Sarti, Pierguido; Johnston, Gary; Vittuari, Luca

doi:10.1007/s00190-006-0125-x

Cited by 42 publications

(16 citation statements)

References 4 publications

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“…The estimated accuracy of the reference point from the verification model isŝ s ¼ 0:2 mm in each coordinate-component. The di¤erences between the reference points, calculated from the di¤erent methods, are very small and in the range of the esti- Dawson et al (2006) has shown that the chosen additional restrictions influence the result of the circle-fitting method more significantly than the di¤erences given in Table 4.…”

Section: Results Verificationmentioning

confidence: 99%

Reference point determination with a new mathematical model at the 20 m VLBI radio telescope in Wettzell

Lösler¹

2008

Journal of Applied Geodesy

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Abstract. A new mathematical model to estimate the International VLBI Service (IVS) reference point and additional parameters of a Very Long Baseline Interferometry (VLBI) radio telescope was developed by Lö sler and Hennes (2008). To verify this analysis procedure a reference point determination was carried out on the 20 m radio telescope at the ''Fundamentalstation Wettzell'' (Germany) from April to May 2008. This paper describes the terrestrial local survey, the analysis methodology and the results obtained, in particular the accuracy of the determination of the IVS reference point.

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Section: Results Verificationmentioning

confidence: 99%

Reference point determination with a new mathematical model at the 20 m VLBI radio telescope in Wettzell

Lösler¹

2008

Journal of Applied Geodesy

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“…VLBI (Dawson et al, 2007;Eschelbach and Haas, 2003;Johnston et al, 2004). 3 circle (Kallio and Poutanen, 2010).…”

Section: D Circle Fittingmentioning

confidence: 99%

A Comparative Analysis of 3D Circle Fitting Algorithms for Determination of VLBI Antenna Reference Point

Gil¹,

Sang²,

Sik³

et al. 2015

Journal of the Korean Society of Surveying, Geodesy, Photogramm

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The accuracy of reference point of VLBI antenna is mandatory to perform collocation of different space geodetic techniques. In this study, we evaluated the optimal methods for the 3D circle fitting to enhance the accuracy of the reference point of VLBI antenna. Two kinds of methodologies for the orthonormal coordinate system with translation of planar observation point and the unitary coordinate transforamation were suggested and their fitting accuracies were evaluated where the orthogonal distance was calculated by residual between observation point and fitting model and the recursive calculation was performed to improve the accuracy of 3D circle fitting. Finally, we found that the methodology for the unitary coordinate transformation is highly appropriate to determine the optimal equation for azimuth-axis and elevation-axis of VLBI antenna. Therefore, the reference point of VLBI antenna with high accuracy can be determined by the intersection of the above two axises (azimuth-axis and elevation-axis). This result is expected to be utilized for a variety of researches for connection between VLBI observation results and the national control point. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http:// creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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“…Usually, the reference point cannot be materialized for direct measurements, and therefore indirect survey methods need to be applied [e.g. Eschelbach and Haas (2003), Sarti et al (2004), Dawson et al (2007), Leinen et al (2007), Lanotte et al (2008), Lösler (2008), Kallio and Poutanen (2012), Li et al (2014), Ning et al (2015)]. …”

Section: Radio Telescope Reference Point Determinationmentioning

confidence: 99%

Terrestrial monitoring of a radio telescope reference point using comprehensive uncertainty budgeting

Lösler

Haas

Eschelbach

2016

J Geod

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During the 15-day-long global very long baseline interferometry campaign CONT14, a terrestrial monitoring campaign was carried out at the Onsala Space Observatory. The goal of these efforts was to monitor the reference point of the Onsala 20 m radio telescope during normal telescope operations. Parts of the local site network as well as a number of reflectors that were mounted on the 20 m radio telescope were observed in an automated and continual way using the in-house-developed software package HEIMDALL. The analysis of the observed data was performed using a new concept for a coordinate-based network adjustment to allow the full adjustment process in a true Cartesian global reference frame. The Akaike Information Criterion was used to select the preferable functional model for the network adjustment. The comprehensive stochastic model of this network adjustment process considers over 25 parameters, and, to describe the persistence of the observations performed during the monitoring with a very high measurement frequency, includes also time-dependent covariances. In total 15 individual solutions for the radio telescope reference point were derived, based on monitoring observations during the normal operation of the radio telescope. Since the radio telescope was moving continually, the influence of timing errors was studied and considered in the adjustment process. Finally, recursive filter techniques were introduced to combine the 15 individual solutions. Accuracies at the sub-millimeter level could be achieved for the radio telescope reference point. Thus, the presented monitoring concept fulfills the requirement proposed by the global geodetic observing system.

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Indirect approach to invariant point determination for SLR and VLBI systems: an assessment

Cited by 42 publications

References 4 publications

Reference point determination with a new mathematical model at the 20 m VLBI radio telescope in Wettzell

Reference point determination with a new mathematical model at the 20 m VLBI radio telescope in Wettzell

A Comparative Analysis of 3D Circle Fitting Algorithms for Determination of VLBI Antenna Reference Point

Terrestrial monitoring of a radio telescope reference point using comprehensive uncertainty budgeting

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