THE USE OF THE AUTOMATED DIGITAL ZENITH CAMERA SYSTEM IN ISTANBUL FOR THE DETERMINATION OF ASTROGEODETIC VERTICAL DEFLECTION

Albayrak M., Halicioglu K., Özlüdemir M. T., Basoglu B., Deniz R., Tyler A. R. B., ...More

BOLETIM DE CIENCIAS GEODESICAS, vol.25, 2019 (ESCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25
  • Publication Date: 2019
  • Doi Number: 10.1590/s1982-21702019000400025
  • Journal Name: BOLETIM DE CIENCIAS GEODESICAS
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus
  • Keywords: Vertical deflections, Astrogeodetic Measurement, Geodetic instrumentation, Digital zenith camera system, QDaedalus, Accuracy and precision, SLOPE VALIDATION SURVEY, ACCURACY, COMPONENTS, QDAEDALUS, NETWORK, GPS
  • Istanbul Technical University Affiliated: Yes

Abstract

The Digital Zenith Camera Systems (DZCSs) are dedicated astrogeodetic instruments used to obtain highly accurate astrogeodetic vertical deflection (VD) data. The first Turkish DZCS, the Astrogeodetic Camera System (ACSYS), was developed in Istanbul, Turkey in 2015. The ACSYS was capable of determining astrogeodetic VDs with an accuracy of similar to 0.3 arcseconds. However, it had some limitations in observation duration: because of the semi-automated mechanical design, levelling the system towards zenith was a time-consuming process. Since 2016, the ACSYS has been modernized through system upgrades and new technological components. In this paper, we describe the instrument design of the new DZCS-ACSYS2-observation procedures, evaluation of the test data and calculations of these data. The preliminary ACSYS2 astrogeodetic test observations were conducted at Istanbul Technical University (ITU) test station. The standard deviation results of the repeated observations reveal a VD measurement precision of similar to 0.3 arcseconds for both the North-South and East-West components. To investigate the accuracy of the system, a lightweight total station