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16 results for “Very long baseline interferometry”
Dataset for 'Intercontinental comparison of optical atomic clocks through very long baseline interferometry'
<p>Dataset for the international comparison of optical atomic clocks using Very Long Baseline Interferometry (VLBI) and Global Positioning System (GPS) precise point positioning solution with integer ambiguity (IPPP) techniques appeared in <em>Nature Physics, <strong> 17</strong></em>, 223-227 (2021). The dataset is also available at <a href="https://doi.org/10.1038/s41567-020-01038-6">https://doi.org/10.1038/s41567-020-01038-6</a></p>
Very Long Baseline Interferometry (VLBI) DB data from NASA CDDIS
Very Long Baseline Interferometry (VLBI) binary files provided by the International VLBI Service for Geodesy and Astrometry (IVS) in vgosDB format.
Data related to Manuscript: Common-clock Very Long Baseline Interferometry using a coherent optical fiber link
<p>Data related to the Figures of Manuscript: Common-clock Very Long Baseline Interferometry using a coherent optical fiber link</p>
Very Long Baseline Interferometry (VLBI) Tropospheric Parameters (TROP) products from NASA CDDIS
Troposphere Zenith Path Delay (ZPD) values derived from analysis of Very Long Baseline Interferometry (VLBI) data. These products are the generated by analysis centers in support of the International VLBI Service for Geodesy and Astrometry (IVS).
Very Long Baseline Interferometry (VLBI) Level 1A correlator (SWIN) output from NASA CDDIS
SWIN files contain the VLBI fringe visibilities of an observing session (24 hours long or 1 hour long). The files are created by the International VLBI Service for Geodesy and Astrometry (IVS) correlation centers and constitute the raw output of the Distributed FX-style (DiFX) software correlator running on a Swinburne supercomputer. These data form the basis for the fringe fitting process and can also be used to make source maps of the observed quasars.
Very Long Baseline Interferometry (VLBI) Celestial Reference Frame (CRF) solution products from NASA CDDIS
Celestial Reference Frame (CRF) product derived from analysis of Very Long Baseline Interferometry (VLBI) data. These products are the generated by analysis centers in support of the International VLBI Service for Geodesy and Astrometry (IVS) and combined by the IVS analysis coordinator to form the official IVS CRF product.
Very Long Baseline Interferometry (VLBI) Intensive Earth Orientation Parameter (EOP-I) Series products from NASA CDDIS
These derived data products are intensive (1-hour experiments) Earth orientation parameter (EOPI) solutions obtained with Very Long Baseline Interferometry (VLBI). The CDDIS archive contains EOPI solutions provided by various analysis centers of the International VLBI Service for Geodesy and Astrometry (IVS). The VLBI EOPI series products includes one for each Universal Time (UT1) intensive session with a minimum of one year of data. The operational EOPI product is available at IVS Data Centers 24 hours after the Intensive data become available.
Very Long Baseline Interferometry (VLBI) National Geodetic Survey (NGS) card data from NASA CDDIS
Very Long Baseline Interferometry (VLBI) ASCII files in the NGS card format. Very Long Baseline Interferometry (VLBI) auxiliary ASCII files provided by the International VLBI Service for Geodesy and Astrometry (IVS) include schedules, notes, and session log files.
Very Long Baseline Interferometry (VLBI) Daily SINEX Independent Solution product (DSNX) from NASA CDDIS
The daily solution files are an analysis product that provides estimates of Earth orientation and site positions for each 24-hour session, the covariance matrix of the estimates, and decomposed normal equations. The solution files are in SINEX format. The SINEX product files are available on the same frequency as the EOP-S products: 24 hours after each new session data base is available.
Global Very Long Baseline Interferometry (VLBI) Terrestrial Reference Frame (TRF) solution products from NASA CDDIS
The Terrestrial Reference Frame product consists of a set of station positions, velocities, and correlations. A minimum of three years of data is used in each solution. The TRF operational product is available on the IVS Data Centers approximately quarterly.
Very Long Baseline Interferometry (VLBI) Daily Intensive Solution Product (DSNI)
The daily Intensive solution files in SINEX format are analysis products that are mainly designed for combination, for both within the IVS and with other space techniques, since they contain datum-free normal equations (decomposed normal equations). Secondly, they allow to estimate UT1 for each 1-hour Intensive session applying a selected datum. Thirdly, the files contain estimates for all parameters (site positions, polar motion, UT1-TAI, and LOD), but these parameters, except UT1-TAI, have been tightly constrained to a priori values. The files are in SINEX format providing also the covariance matrix of the estimates. The SINEX product files are available on the same frequency as the EOP-I products: 24 hours after each new session data base is available.
Very Long Baseline Interferometry (VLBI) Terrestrial Reference Frame (TRF) products from NASA CDDIS
Terrestrial Reference Frame (TRF) product derived from the analysis of Very Long Baseline Interferometry (VLBI) data. The Terrestrial Reference Frame product includes station positions, velocities, and correlations. A minimum of three years of data are used in each solution. The TRF operational product is available quarterly at International VLBI Service for Geodesy and Astrometry (IVS) Data Centers.
Very Long Baseline Interferometry (VLBI) Session Earth Orientation Parameter Series (EOP-S) Product from NASA CDDIS
The Session Series EOP product is a series of EOP results, one for each geodetic session. Data are irregularly spaced and there are multiple results for days on which there were simultaneous sessions. Each series includes a minimum of one year of results. The operational EOP-S product is available on the IVS Data Centers 24 hours after availability of each new session data base.
Very Long Baseline Interferometry (VLBI) Auxiliary Files from NASA CDDIS
Very Long Baseline Interferometry (VLBI) auxiliary ASCII files provided by the International VLBI Service for Geodesy and Astrometry (IVS) include schedules, notes, and session log files.
Very Long Baseline Interferometry (VLBI) Level 2 VLBI Global Observing System (VGOS) DB format data from NASA CDDIS
This CDDIS collection is composed of geodetic, Very Long Baseline Array (VLBI) level 2 observational and supporting data (including observations, standard deviations, station coordinates, and more) and derived products which are stored and exchanged in a format named vgosDB, which is the International VLBI Service for Geodesy and Astrometry (IVS) standard format for storing, transmitting, and archiving VLBI data. vgosDB datasets are comprised of NetCDF and ASCII files which contain almost all the information that is required to process a single VLBI session (typically 24-hours of data per single session).
Supporting Information for Very Long Baseline Interferometry (VLBI) Data and Products from NASA CDDIS
Very Long Baseline Interferometry (VLBI) is a geometric technique: it measures the time difference between the arrival at two Earth-based antennas of a radio wavefront emitted by a distant quasar. VLBI precisely locates points on Earth by comparing radio signals from a quasar radio source located in deep space received at different times at different Earth ground stations. This method gives relative positions of the Earth stations. VLBI data can be used to calculate information on Earth rotation, length of day, polar motion, baseline and velocities of stations. Products generated by VLBI contribute to research in many areas, including solid Earth, tides, studies of the vertical, fundamental astronomy, and VLBI technique improvement. More information about these data and products are available on the CDDIS website at https://cddis.nasa.gov/Data_and_Derived_Products/VLBI/VLBI_data_and_product_archive.html.
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