1 Murzabekov M.M.
2 Kopaev A.V.
3 Fateev V.F.

FSUE «All-Russian Scientific Research Institute of Physical-Technical and Radiotechnical Measurements» (FSUE «VNIIFTRI»)

Within several decades astrogeodetic observations were carried out visually therefore were required not only the best devices, but also the qualified observers. The invention of CCDs caused significant technological changes in geodetic astronomy. Digital zenith camera systems (DZCS) based on the CCDs led to improvements in the degree of automation, efficiency and accuracy of determining of vertical deflection. Thanks to a fully automated system of registration of this new experimental model has eliminated «human factor». The existing DZCS have accuracy at least at the level of traditional methods and considerably surpass them in performance reaching the accuracy of definition of vertical deflection in 0,1″ and better within 30 min. Astrogeodetic method using DZCS provides direct determination of vertical deflection by comparing the geodetic and astronomical coordinates of location. This paper describes astrogeodetic method and existing DZCS.
1.   Bragin A.A. Issledovanie sposobov opredeleniya koordinat centra izobrazheniya tochechnogo istochnika izlucheniya. Izv. Vuzov. Geodeziya i aehrofotos"emka, 2009, no. 5, pp. 73–80.
2.   Zharov V.E. Sfericheskaya astronomiya. Fryazino: Vek 2, 2006, 480 p.
3.   Fosu C. (2004) Determination of centroid of CCD star images. XX ISPRS Congress, Istanbul, Turkey, pp. 612–617.
4.   Hirt C. (2004) Entwicklung und Erprobung eines digitalen Zenitkamerasystems für die hochpräzise Lotabweichungsbestimmung. Ph. D. Thesis, Wissen. Arb. der Fachrichtung Geodäsie und Geoinformatik ander Universität Hannover, no. 253,
5.   Hirt C. (2006) Monitoring and Analysis of Anomalous Refraction Using a Digital Zenith Camera System. Astronomy and Astrophysics, no. 459(1), pp. 283–290. DOI: 10.1051/0004-6361:20065485.
6.   Høg E., Fabricius C., Makarov V.V., Urban S., Corbin T., Wycoff G., Bastian U., Schwekendiek P., Wicenec A. (2000) The Tycho-2 catalogue of the 2.5 million brightest stars. Astron. Astrophys.,
7.   Somieski A. (2008) Astrogeodetic Geoid and Isostatic Considerations in the North Aegean Sea, Greece. A dissertation submitted to the ETH Zurich for the degree of Doctor of Sciences,
8.   Torge W. (2001) Geodesy, 3rd Ed., Walter de Gruyter, Hawthorne, N.Y..
9.   Zacharias N., Finch C.T., Girard T.M., Henden A., Bartlett J.L., Monet D.G., Zacharias M.I. (2013) The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4). The Astronomical Journal, Volume 145, no. 2, pp. 14.
Murzabekov M.M., 
Kopaev A.V., 
Fateev V.F., 
(2016) The metrological characteristics of the astrogeodetic measurer of vertical deflections on the basis of digital zenith camera. Geodesy and cartography = Geodezia i Kartografia, (4), pp. 10–17. (In Russian). DOI: 10.22389/0016-7126-2016-910-4-10-17