Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004smra.conf..158c&link_type=abstract
Spectrum Management for Radio Astronomy, Proceedings of the IUCAF summer school Held at Green Bank, West Viginia, June 9-14, 200
Astronomy and Astrophysics
Astronomy
Scientific paper
GLONASS navigation satellites transmit one of their navigation signals in a frequency band that overlaps the frequency band 1610.6-1613.8 MHz used for radio astronomical observations of the spectral line of hydroxyl (OH) at 1612.231 MHz. Following growing levels of interference during the 1980s, IUCAF and GLONASS entered into negotiations. A joint experiment was conducted in November 1992 to verify the levels of interference to different types of radio astronomical measurements and to test possible interference mitigation methods that the GLONASS administration could employ without compromising the integrity of the navigation signal. Twelve radio observatories around the world participated. During the 2-day experiment the centre frequencies of navigation signals were removed from the radio astronomy band and some navigation signals were turned off. The results of the experiment are reviewed. These formed the basis for the GLONASS-IUCAF signed in November 1993, which has served as a model for coordination agreements between GLONASS and many administrations. The agreement sets out s step-by-step plan for interference reduction. The current status and future prospects are reviewed.
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