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 ~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 ~0.3 arcseconds for both the North-South and East-West components. To investigate the accuracy of the system, a lightweight total station based-geodetic system-QDaedalus-was also used at the ITU test station. The comparison of the VDs data between ACSYS2 and QDaedalus system shows that the ACSYS2 can produce reliable VDs data.
| Original language | English |
|---|---|
| Article number | e2019025 |
| Journal | Boletim de Ciencias Geodesicas |
| Volume | 25 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2019 |
Bibliographical note
Publisher Copyright:© 2019, Universidade Federal do Parana. All rights reserved.
Funding
The instrument design of the ACSYS2 was developed by Sudo Robotik. This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK [grant number 115Y237]). MA is grateful to the Fulbright Foundation and to Prof. CK Shum for their support during the writing process of the manuscript. The authors are grateful to Dr. Christian Hirt and Prof. Sebastién Guillaume for their support of the QDaedalus system, and for sharing their TZK2-D, DIADEM and CODIAC DZCSs experience with us. We are grateful to our students who worked as scholarship holders on the TUBITAK projects, MSc. Rasit Ulug and Seyyid Ali Topal, and to our intern, Alihan Keskin. We also would like to thank Prof. Rahmi Nurhan Çelik, Assoc. Prof. Aydin Ustun and Assist. Prof. Caner Guney for their feedback and constructive comments on the development of the ACSYS2. We would like to thank the Associate Editor who provided insightful and thorough feedback for the manuscript for which we are grateful, and to the reviewers, who provided timely and thoughtful comments. We wish to thank graphic designer Ercan Tuna for ACSYS2‘s illustration assistance (Figure 6). Figure 11 was drawn using the Generic Mapping Tools (GMT) from Wessel et al. (2013). The utilisation of a tribrach as the supporting substructure not only prolonged the levelling process but had many other disadvantages 堀 The total weight of the instrument 縁ȁ褁褁?oximately ?g Z and design of the system produce a tilting effect that needed to be adjusted through a system 爁送褁?cific levelling procedure ? iterative levelling 縀Halıcıoğlu et al 堀 ȃ? ༃Z 堀 Also ? the total weight of the system made transport logistically difficult and required a wheeled substructure design 堀 Therefore 唀 work began in to automate the observation and data processing procedure ? with the support of the Scientific and Technological Research Council of Turkey 縀TUBITAK Z 堀 In the scope of this project ? a supporting substructure was designed based on the lessons learned from previous measurement campaigns that would facilitate the utilisation of the ACSYS during observations 縀Figure Z 堀 The trolley of the new design was influenced by the success of the CODIAC design 縀Guillaume Z ? one of the most recently designed DZCS ?
| Funders | Funder number |
|---|---|
| Fulbright Foundation | |
| Scientific and Technological Research Council of Turkey 縀TUBITAK | |
| Türkiye Bilimsel ve Teknolojik Araştirma Kurumu | 115Y237 |
Keywords
- Accuracy and precision
- Astrogeodetic measurement
- Digital zenith camera system
- Geodetic instrumentation
- QDaedalus
- Vertical deflections