The Potsdam Open Source Radio Interferometry Tool (PORT)

Schuh, Harald; Heinkelmann, Robert; Beyerle, G.; Anderson, J. M.; Balidakis, Kyriakos; Belda, Santiago; Dhar, Sujata; Glaser, Susanne; Jenie, Okky S.; Karbon, Maria; Kitpracha, Chaiyaporn; Nehbit, Pakize Küreç; Liu, L.; Lunz, Susanne; Mammadaliyev, Nicat; Modiri, Sadegh; Nilsson, Tobias; Raut, Shrishail; Soja, Benedikt; Wang, Jungang; Mei-ling, XU

doi:10.1088/1538-3873/ac299c

Cited by 3 publications

(3 citation statements)

References 42 publications

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“…The results discussed in this study are derived from VLBI analysis, the details of which will be specified in this chapter. In this work, we used the GFZ version of the Vienna VLBI Software [ 14 ], VieVs@GFZ [ 15 ], upon which the PORT [ 16 ] is based.…”

Section: Methodsmentioning

confidence: 99%

Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17

Raut

Heinkelmann

Modiri

et al. 2022

Sensors

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This work focuses on the assessment of UT1-UTC estimates from various types of sessions during the CONT17 campaign. We chose the CONT17 campaign as it provides 15 days of continuous, high-quality VLBI data from two legacy networks (S/X band), i.e., Legacy-1 (IVS) and Legacy-2 (VLBA) (having different network geometry and are non-overlapping), two types of Intensive sessions, i.e., IVS and Russian Intensives, and five days of new-generation, broadband VGOS sessions. This work also investigates different approaches to optimally compare dUT1 from Intensives with respect to the 24 h sessions given the different parameterization adopted for analyzing Intensives and different session lengths. One approach includes the estimation of dUT1 from pseudo Intensives, which are created from the 24 h sessions having their epochs synchronized with respect to the Intensive sessions. Besides, we assessed the quality of the dUT1 estimated from VGOS sessions at daily and sub-daily resolution. The study suggests that a different approach should be adopted when comparing the dUT1 from the Intensives, i.e., comparison of dUT1 value at the mean epoch of an Intensive session. The initial results regarding the VGOS sessions show that the dUT1 estimated from VGOS shows good agreement with the legacy network despite featuring fewer observations and stations. In the case of sub-daily dUT1 from VGOS sessions, we found that estimating dUT1 with 6 h resolution is superior to other sub-daily resolutions. Moreover, we introduced a new concept of sub-daily dUT1-tie to improve the estimation of dUT1 from the Intensive sessions. We observed an improvement of up to 20% with respect to the dUT1 from the 24 h sessions.

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Section: Methodsmentioning

confidence: 99%

Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17

Raut

Heinkelmann

Modiri

et al. 2022

Sensors

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“…Note that GNSS and VLBI observations are always processed by a common least‐squares estimator. We adopt a module of the Potsdam Open Source Radio Interferometry Tool (Schuh et al., 2021) to read VGOS‐DB files and output the observations into NGS‐card format for sessions after 2017 as the VGOS‐DB format is adopted by IVS for this period.…”

Section: Methodsmentioning

confidence: 99%

Impact of Tropospheric Ties on UT1‐UTC in GNSS and VLBI Integrated Solution of Intensive Sessions

Wang

Glaser

et al. 2022

JGR Solid Earth

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Earth Orientation Parameters (EOPs) describe the change of the orientation of the Earth with respect to space and give the transformation between the International Celestial Reference Frame (Charlot et al., 2020) and the International Terrestrial Reference Frame (Altamimi et al., 2016). Accurate EOP information is important for positioning and navigation on the Earth and for space exploration missions, in particular for real-time applications. Currently, the EOPs are determined mainly by four space geodetic techniques including Global Navigation Satellite Systems (GNSSs) and Very Long Baseline Interferometry (VLBI) (Bizouard et al., 2018). The latter realizes uniquely the celestial pole offsets and Universal Time 1-Coordinate Universal Time (UT1-UTC), thanks to its precise observation to Active Galactic Nuclei (AGN). The 24-hr VLBI sessions are usually conducted two or three times per week with networks of globally distributed radio telescopes, and provide high-precision

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“…Figure 3 illustrates CPO observations obtained from VLBI using the Potsdam Open-Source Radio Interferometry Tool (PORT) [58] and the emprical B16 FCN model estimated between 1990 and 2017. The B16 model is fitted to VLBI data using a sliding window with a length of 400 days, a step size of one day, and a fixed period of −431.18 sidereal days.…”

Section: Fcn Datamentioning

confidence: 99%

Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques

Modiri

Heinkelmann

Belda

et al. 2021

Sensors

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The understanding of forced temporal variations in celestial pole motion (CPM) could bring us significantly closer to meeting the accuracy goals pursued by the Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG), i.e., 1 mm accuracy and 0.1 mm/year stability on global scales in terms of the Earth orientation parameters. Besides astronomical forcing, CPM excitation depends on the processes in the fluid core and the core–mantle boundary. The same processes are responsible for the variations in the geomagnetic field (GMF). Several investigations were conducted during the last decade to find a possible interconnection of GMF changes with the length of day (LOD) variations. However, less attention was paid to the interdependence of the GMF changes and the CPM variations. This study uses the celestial pole offsets (CPO) time series obtained from very long baseline interferometry (VLBI) observations and data such as spherical harmonic coefficients, geomagnetic jerk, and magnetic field dipole moment from a state-of-the-art geomagnetic field model to explore the correlation between them. In this study, we use wavelet coherence analysis to compute the correspondence between the two non-stationary time series in the time–frequency domain. Our preliminary results reveal interesting common features in the CPM and GMF variations, which show the potential to improve the understanding of the GMF’s contribution to the Earth’s rotation. Special attention is given to the corresponding signal between FCN and GMF and potential time lags between geomagnetic jerks and rotational variations.

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The Potsdam Open Source Radio Interferometry Tool (PORT)

Cited by 3 publications

References 42 publications

Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17

Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17

Impact of Tropospheric Ties on UT1‐UTC in GNSS and VLBI Integrated Solution of Intensive Sessions

Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques

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