GNSS observations by the VLBI technique using a network of ATNF telescopes

Details GNSS observations by the VLBI technique using a network of ATNF telescopes GNSS observations by the VLBI technique using a network of ATNF telescopes

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3670t&link_type=abstract

ATNF proposal V439, Semester: October, 2010

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Active Galactic Nuclei / Quasars, Lba

Scientific paper

Radio sources to observe are not natural radio sources but six satellites of GPS (Global Positioning System) and three of GLONASS (GLObal NAvigation Satellite System) constellations. Frequency signals are L1 (1575.25 MHz) and L2 (1227.6 MHz) for GPS, GLONASS have individual frequencies around G1 (1600 MHz) and G2 (1250 MHz). We want first evaluate tracking capability at each telescope with Lband receiver: Mopra, Parkes, Hobart, and one ATCA station. Satellite signals are very strong, thus, it is important to know: the necessary attenuation and also if antennas really can track the satellites, the apparent motions are of about 0.5 degree for min. As second step VLBI network observation sessions with the four stations will be planned to determine the satellites coordinates. A possible setup is for example to follow the satellite orbits by re-positioning the telescopes every 20 second, and to record 10 second of VLBI data in Mark4format during each step. Another possibility is to use the SATTRACKmodule of the VLBIFS that could be installed at each station. The recorded VLBI data can be then sent electronically to a data archive at the Onsala Space Observatory for further data processing at Onsala and Metsahovi

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