Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.294..271k&link_type=abstract
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 294, Issue 1410,
Astronomy and Astrophysics
Astronomy
Scientific paper
During 1974-6, the Geodetic Survey of Canada established a geodetic control network with spacing between points of about 200-500 km with the use of the satellite-Doppler method. For this application, a unique observation strategy and Doppler data reduction procedures have been developed, by using both precise and broadcast satellite ephemerides. The satellite-Doppler geodetic control has contributed greatly to the readjustment of the Canadian triangulation network, in particular to the datum orientation and positioning. The results have also been useful for geoid studies in Canada. Continuous satellite-Doppler tracking from the two Canadian Tranet stations provides additional information on polar motion and long-term variations of the satellite system, which are important for monitoring and maintaining the related geodetic datum. The basic Doppler control at 200-500 km has been completed and successfully used in the test adjustment of the Canadian geodetic network. Currently, the Doppler method is used for densification at station spacing below 100 km, and in conjunction with the Inertial Survey Systems. A possible difference between Canadian and the U.S. astronomical observations has been encountered. Further research and field programmes are necessary to solve this problem. Permanent Doppler monitoring is viewed as essential for geodetic datum maintenance and determination of time-related aspects of future precise geodetic networks. The research in Canada is directed towards improvements and better understanding of the relation between the different methods of precise global positioning.
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