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About the CDDIS VLBI archive:VLBI uses observations of quasars in the microwave frequency band to yield positions of radio telescopes and radio sources as well as Earth rotation parameters. The raw observables from telescopes involved in simultaneous measurements, typically 24 hours in length, are correlated at a central facility to produce an experiment. VLBI experiments using both fixed and mobile antennas have been sponsored by many global institutions such as NASA, the U. S. Naval Observatory (USNO), the National Geodetic Survey (NGS), the Institute of Applied Geodesy (IfAG) in Germany, the Communications Research Laboratory (CRL) in Japan, and others. The VLBI data available in the CDDIS are organized by experimental session and frequency band and are available in the Mark-III Data Base Handler (DBH) format as well as National Geodetic Survey (NGS) card-image format. Each data base alsocontains other information such as calibration data, solar system ephemerides, a priori parameter values, Earth orientation information, partial derivatives, and theoretical delays and rates. These experiments have been submitted to the CDDIS by VLBI analysis groups located at the GSFC, USNO, JPL, and NGS. Currently, the CDDIS does not routinely provide on-line access to VLBI experiments; these data are stored off-line on magnetic tape. The data are available approximately three to six months after each observing session. VLBI product files. Products derived from VLBI data are also archived at the CDDIS. More information about VLBI data analysis can be found on the IVS products website.
Obtaining access to the CDDIS VLBI data archive:Contact the CDDIS manager to learn how to access data from VLBI experiments.
Summary of CDDIS VLBI tracking data holdings:
Related VLBI data and information links:
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Author: Carey E. Noll |