Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963saosr.123.....v&link_type=abstract
SAO Special Report #123 (1963)
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Three distinct reference systems are involved in an analysis of observations of artificial satellites for geodetic purposes: a terrestrial system for earth-fixed points, a celestial system for observations, and an orbital system for the orbital elements. These reference systems have to be carefully defined and their precise relation established for the fullest exploitation of satellites for geodetic purposes. In practice, both the terrestrial system and the celestial system are replaced by the geodetic and the astrometric systems. The transformation from the celestial system to the terrestrial is done through the use of a sidereal system, or of a modified sidereal system introduced by the author. It can be proved that the optimum system for orbital work is the same with the modified sidereal system. The existing geodetic triangulation nets are expected to be internally consistent to an accuracy of 10-5, and the accuracy with which directions in space can be determined by photographic the object against the star background is expected to be better than 1 sec of arc.
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