Geodesy Laboratory

About

Research Infrastructure

•    Projector
•   2 Laser Printers
•   2 Workstations
•   6 Desktop Computers
•   1 Laptop
•   GNSS Reference Station
•   GNSS Evaluation Kit
•   4 Uninterruptible Power Supply

Researchers

•    Dr. Öğr. Üyesi Gonca Okay Ahi
•    Doç. Dr. Metin Nohutcu
•    Dr. Öğr. Üyesi Kamil Teke
•    Dr. Öğr. Üyesi Murat DURMAZ
•    Yunus Aytaç Akdoğan  
•    Fatih Demirtaş
•    Arş.Gör. Berkay Bahadur
•    Fikret Öcal
•    Yelkin Turan
•    Ahmet Agan
•    İlyas Akpınar
•    Irem Yildiz

Ongoing Projects

•   High Resolution Groundwater Budget Monitoring System with Tübitak 1001 GRACE and Multi-Mission Satellite Remote Sensing Data
Improvement of Multi-GNSS PPP Performance and Development of the First Online PPP Service from Turkey, TÜBİTAK-1001, March 2019-March 2022
•   HT-TTM, Modesis Ltd. St. : Development of a High Precision Stabilized Gimbal Platform for Laser Weapon Systems (TUBITAK 1501)

Completed Projects

•   TUBITAK 3501-Accuracy Improvement of UT1 Parameter Observed by the Space Geodetic Technique, Very Long Baseline Interferometry
Increasing the Accuracy of the UT1 Parameter Monitored by the Very Long Base Interpherometry (VLBI) Space Geodesy Technique, TÜBİTAK-3501, October 2015-October 2018
•   HT-TTM, Modesis Ltd. St. : Improving Toolpath Position Accuracy for Robotic Machining (TUBITAK 1003)

Publications

•   Akdoğan, Y. A., Yildiz, H., & Ahi, G. O. (2019). Evaluation of global gravity models from absolute gravity and vertical gravity gradient measurements in Turkey. Measurement Science and Technology, 30(11), 115009.
•   Okay Ahi, G., & Jin, S. (2019). Hydrologic mass changes and their implications in Mediterranean-climate Turkey from GRACE measurements. Remote Sensing, 11(2), 120.
•   Okay Ahi, G. (2019). Evaluation of filtering effects on terrestrial water storage estimation from new GRACE releases. Geocarto International, 1-16.
•   Bahadur B., Nohutcu M. (2021). Real-time single-frequency multi-GNSS positioning with ultra-rapid products. Measurement Science and Technology 32 (1).
•   Bahadur B., Nohutcu M. (2020). Impact of observation sampling rate on Multi-GNSS static PPP performance. Survey Review, 1-10.
•   Bahadur B., Nohutcu M. (2020). Galileo-based precise point positioning with different MGEX products. MEASUREMENT SCIENCE AND TECHNOLOGY, 31(9).
•   Bahadur B., Nohutcu M. (2019). Comparative analysis of MGEX products for post-processing multi-GNSS PPP. Measurement, 145, 361-369.
•   Bahadur B., Nohutcu M. (2018). PPPH: A MATLAB-based Software for Multi-GNSS Precise Point Positioning Analysis. GPS Solutions, 22(4).
•   LYU HAIXIA, HERNANDEZ PAJARES MANUEL, Chickpea TEXT, GARCIA RIGO ALBERTO, ZHANG HONGPING, LIU JINGNAN (2018). The Barcelona ionospheric mapping function (BIMF) and its application to northern mid-latitudes. GPS Solutions, 22(3).
•    K. Teke (2020) M2 constituent of ocean tide loading displacements from VLBI CONT14 hourly sessions, Annals of Geophysics, Vol: 63(3), GD327, 1-19, doi:10.4401/ag-8180
•    J. Böhm, S. Böhm, J. Boisits, A. Girdiuk, J. Gruber, A. Hellerschmied, H. Krasna, D. Landskron, M. Madzak, D. Mayer, J. McCallum, L. McCallum, M Schartner, K. Teke (2018) Vienna VLBI and Satellite Software (VieVS) for Geodesy and Astrometry, Publications of the Astronomical Society of the Pacific, Vol. 130 (986), 044503; 1 – 6.
•   Bahadur B., Nohutcu M. (2020). Analysis of Robust Kalman Filter Methods for Precise Point Positioning. Map Magazine, vol.86, pp.29-42
•   Bahadur B., Nohutcu M. (2020). MULTI-GNSS PPP: An Alternative Positioning Technique for Establishing Ground Control Points. International Journal of Environment and Geoinformatics, 7(1), 88-92.
•   Bahadur B., Nohutcu M. (2019). Investigation of the effect of clock jumps in GNSS receivers on PPP performance. Journal of Geodesy and Geoinformation, 6(2), 87-95.
•   Bahadur B., Nohutcu M. (2019). Performance Evaluation of Galileo Based Precision Point Positioning Method: The Case of Turkey. Map Magazine, 85(162), 1-11.
•   Bahadur B., Nohutcu M. (2018). The Effect of Multi-GNSS Combinations on PPP Performance for Turkey and Its Neighborhood. Map Magazine, 84(160), 1-11.
•    K. Teke, M.F. Ocal, M. Nohutcu, G.O. Ahi (2017) Monitoring Universal Time (UT1) with Analysis of VLBI Intensive Sessions, Afyon Kocatepe University Journal of Science and Engineering, 17 (3), 1004-1018, doi: 10.5578/fmbd.66171.
•    K. Teke, M.F. Öcal (2017) Estimation of High-Frequency Earth Rotation Parameters by Analysis of the IVS-CONT14 Campaign and Comparison with the IERS2010 Model, Afyon Kocatepe University Journal of Science and Engineering, 17 (2), 628-637, doi: 10.5578/fmbd.58667.

Links

About

Research Infrastructure

•    Projector
•   2 Laser Printers
•   2 Workstations
•   6 Desktop Computers
•   1 Laptop
•   GNSS Reference Station
•   GNSS Evaluation Kit
•   4 Uninterruptible Power Supply

Researchers

•    Dr. Öğr. Üyesi Gonca Okay Ahi
•    Doç. Dr. Metin Nohutcu
•    Dr. Öğr. Üyesi Kamil Teke
•    Dr. Öğr. Üyesi Murat DURMAZ
•    Yunus Aytaç Akdoğan  
•    Fatih Demirtaş
•    Arş.Gör. Berkay Bahadur
•    Fikret Öcal
•    Yelkin Turan
•    Ahmet Agan
•    İlyas Akpınar
•    Irem Yildiz

Ongoing Projects

•   High Resolution Groundwater Budget Monitoring System with Tübitak 1001 GRACE and Multi-Mission Satellite Remote Sensing Data
Improvement of Multi-GNSS PPP Performance and Development of the First Online PPP Service from Turkey, TÜBİTAK-1001, March 2019-March 2022
•   HT-TTM, Modesis Ltd. St. : Development of a High Precision Stabilized Gimbal Platform for Laser Weapon Systems (TUBITAK 1501)

Completed Projects

•   TUBITAK 3501-Accuracy Improvement of UT1 Parameter Observed by the Space Geodetic Technique, Very Long Baseline Interferometry
Increasing the Accuracy of the UT1 Parameter Monitored by the Very Long Base Interpherometry (VLBI) Space Geodesy Technique, TÜBİTAK-3501, October 2015-October 2018
•   HT-TTM, Modesis Ltd. St. : Improving Toolpath Position Accuracy for Robotic Machining (TUBITAK 1003)

Publications

•   Akdoğan, Y. A., Yildiz, H., & Ahi, G. O. (2019). Evaluation of global gravity models from absolute gravity and vertical gravity gradient measurements in Turkey. Measurement Science and Technology, 30(11), 115009.
•   Okay Ahi, G., & Jin, S. (2019). Hydrologic mass changes and their implications in Mediterranean-climate Turkey from GRACE measurements. Remote Sensing, 11(2), 120.
•   Okay Ahi, G. (2019). Evaluation of filtering effects on terrestrial water storage estimation from new GRACE releases. Geocarto International, 1-16.
•   Bahadur B., Nohutcu M. (2021). Real-time single-frequency multi-GNSS positioning with ultra-rapid products. Measurement Science and Technology 32 (1).
•   Bahadur B., Nohutcu M. (2020). Impact of observation sampling rate on Multi-GNSS static PPP performance. Survey Review, 1-10.
•   Bahadur B., Nohutcu M. (2020). Galileo-based precise point positioning with different MGEX products. MEASUREMENT SCIENCE AND TECHNOLOGY, 31(9).
•   Bahadur B., Nohutcu M. (2019). Comparative analysis of MGEX products for post-processing multi-GNSS PPP. Measurement, 145, 361-369.
•   Bahadur B., Nohutcu M. (2018). PPPH: A MATLAB-based Software for Multi-GNSS Precise Point Positioning Analysis. GPS Solutions, 22(4).
•   LYU HAIXIA, HERNANDEZ PAJARES MANUEL, Chickpea TEXT, GARCIA RIGO ALBERTO, ZHANG HONGPING, LIU JINGNAN (2018). The Barcelona ionospheric mapping function (BIMF) and its application to northern mid-latitudes. GPS Solutions, 22(3).
•    K. Teke (2020) M2 constituent of ocean tide loading displacements from VLBI CONT14 hourly sessions, Annals of Geophysics, Vol: 63(3), GD327, 1-19, doi:10.4401/ag-8180
•    J. Böhm, S. Böhm, J. Boisits, A. Girdiuk, J. Gruber, A. Hellerschmied, H. Krasna, D. Landskron, M. Madzak, D. Mayer, J. McCallum, L. McCallum, M Schartner, K. Teke (2018) Vienna VLBI and Satellite Software (VieVS) for Geodesy and Astrometry, Publications of the Astronomical Society of the Pacific, Vol. 130 (986), 044503; 1 – 6.
•   Bahadur B., Nohutcu M. (2020). Analysis of Robust Kalman Filter Methods for Precise Point Positioning. Map Magazine, vol.86, pp.29-42
•   Bahadur B., Nohutcu M. (2020). MULTI-GNSS PPP: An Alternative Positioning Technique for Establishing Ground Control Points. International Journal of Environment and Geoinformatics, 7(1), 88-92.
•   Bahadur B., Nohutcu M. (2019). Investigation of the effect of clock jumps in GNSS receivers on PPP performance. Journal of Geodesy and Geoinformation, 6(2), 87-95.
•   Bahadur B., Nohutcu M. (2019). Performance Evaluation of Galileo Based Precision Point Positioning Method: The Case of Turkey. Map Magazine, 85(162), 1-11.
•   Bahadur B., Nohutcu M. (2018). The Effect of Multi-GNSS Combinations on PPP Performance for Turkey and Its Neighborhood. Map Magazine, 84(160), 1-11.
•    K. Teke, M.F. Ocal, M. Nohutcu, G.O. Ahi (2017) Monitoring Universal Time (UT1) with Analysis of VLBI Intensive Sessions, Afyon Kocatepe University Journal of Science and Engineering, 17 (3), 1004-1018, doi: 10.5578/fmbd.66171.
•    K. Teke, M.F. Öcal (2017) Estimation of High-Frequency Earth Rotation Parameters by Analysis of the IVS-CONT14 Campaign and Comparison with the IERS2010 Model, Afyon Kocatepe University Journal of Science and Engineering, 17 (2), 628-637, doi: 10.5578/fmbd.58667.

Links