~/publications

Selected publications and conference work.

2026
Assessing the Reliability of the GNSS Loss of Lock Indicator (LLI) Index for PPP Across Different Types of GNSS Receivers
Sermet Ogutcu, Salih Alcay, Sercan Bulbul, Marcus Franz Wareyka-Glaner, Gurkan Oztan, Behlul Numan Ozdemir, Huseyin Duman
Advances in Space Research
https://doi.org/10.1016/j.asr.2026.01.063
2025
The effect of ambiguity resolution on the precision of the GPS/Galileo PPP using a u-blox ZED-F9P low-cost GNSS receiver
Sermet Ogutcu, Huseyin Duman, Behlul Numan Ozdemir, Salih Alcay
Advances in Space Research
https://doi.org/10.1016/j.asr.2024.09.047
2025
Towards geodetic-level accuracy in low-cost GNSS: tectonic velocity determination capabilities of the u-blox ZED-F9P over a year multi-GNSS PPP-AR time series
Huseyin Duman, Sermet Ogutcu, Salih Alcay, Behlul Numan Ozdemir, Omer Faruk Atiz, Sercan Bulbul
Advances in Space Research
https://doi.org/10.1016/j.asr.2025.10.025
2024
GRIMS: global and regional ionosphere monitoring system
Behlul Numan Ozdemir, Salih Alcay, Sermet Ogutcu, Ahmet Pekgor, Gopi Krishna Seemala, Gurkan Oztan
GPS Solutions
https://doi.org/10.1007/s10291-024-01702-x
2024
Analysis of Ionospheric VTEC Retrieved from Multi-Instrument Observations
Gurkan Oztan, Huseyin Duman, Salih Alcay, Sermet Ogutcu, Behlul Numan Ozdemir
Atmosphere
https://doi.org/10.3390/atmos15060697
2023
GPS + Galileo + BDS-3 medium to long-range single-baseline RTK: an alternative for network-based RTK?
Salih Sermet Öğütcü, Salih Alcay, Behlül Numan Özdemir, Hüseyin Duman, Ülkünur Koray, Ceren Konukseven, Nesibe Gül Bilal
Cambridge University Press (CUP)
https://dx.doi.org/10.1017/S0373463323000243
2023
Static and kinematic PPP-AR performance of low-cost GNSS receiver in monitoring displacements
Salih Sermet Öğütcü,Salih Alçay,Hüseyin Duman, Behlül Numan Özdemir, Ceren Konukseven
Advances in Space Research
https://doi.org/10.1016/j.asr.2023.09.025
2023
Data Integrity and Quality Analysis of Low Cost Zed-F9p U-Blox Gnss Receiver
Salih Sermet Öğütcü,Salih Alçay,Hüseyin Duman, Behlül Numan Özdemir, Ülkünur Koray
Konya Journal of Engineering Sciences
https://doi.org/10.36306/konjes.1268932
2023
GPS, GLONASS, Galileo ve BeiDou GNSS Sistemlerinin 1. ve 2. Temel Frekanslarının Doluluk Analizi
Salih Sermet Öğütcü, Behlül Numan Özdemir, Salih Alçay, İlkay Buğdaycı
Necmettin Erbakan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi 5 (1), 14-22
https://doi.org/10.47112/neufmbd.2023.6
2023
Availability Analysis of GNSS Orbit and Clock Files
Salih Sermet Öğütcü,Salih Alçay,Behlül Numan Özdemir,Ceren Konukseven,Ömer Faruk Atiz
El-Cezeri: Journal of Science and Engineering,
https://dx.doi.org/10.31202/ecjse.1095911
2022
ON THE ALL-SATELLITE AND SINGLE-SATELLITE TECHNIQUES FOR GNSS CLOCK PRODUCTS COMPARISON
Salih Sermet Öğütcü, Behlül Numan Özdemir, Ülkünur Koray
International Studies in Engineering, Serüven Publishing
ISBN 978-625-6644-80-9
2022
Evaluation of the TEC prediction performance of NeQuick2 model
Salih Alçay, Salih Sermet Öğütcü, Gürkan Öztan, Behlül Numan Özdemir
5th Intercontinental Geoinformation Days
2022
Epoch Availability Analysis Of Low Cost GNSS Receiver
Ceren Konukseven, Salih Alçay, Salih Sermet Öğütcü, Behlül Numan Özdemir, Mehmet Hacibeyoğlu, Esma Nisa Candan
International Conference on Engineering Technologies
2022
Assessing the performance of BDS-3 for multi-GNSS static and kinematic PPP-AR
Salih Sermet Öğütcü, Salih Alçay, Behlül Numan Özdemir, Pan Li, Yize Zhang, Ceren Konukseven, Ömer Faruk Atiz
Advances in Space Research
https://dx.doi.org/10.1016/j.asr.2022.10.016
2021
The impact of variable neighbor numbers on Wi-Fi fingerprint-based indoor positioning using the KNN and WKNN algorithms
Behlül Numan Özdemir, Ayhan Ceylan
2nd Intercontinental Geoinformation Days
2018
An Indoor Positioning Study Based On The Wi-Fi Fingerprinting Method
Behlül Numan Özdemir, Ayhan Ceylan
EURASIAN GIS 2018
2018
On The Improvement Of The Orthometric Heights With Gnss Leveling: The Case Of Selcuk University Campus Area
Ayhan Ceylan, Behlül Numan Özdemir
EURASIAN GIS 2018
2016
Investigating Point Positioning Accuracy and Digital Mapping Using Low Altitude UAV
Ayhan Ceylan, Behlül Numan Özdemir
International Scientific Conference On Applied Sciences, ”Spatial Data Processing, Modelling, Analysing and Management for Knowledge Based Systems
2016
CORS Ağları Ve Konya Sabit Gnss Ağı’nın (KOSAGA) Nokta Konum Doğruluğunun Araştırılması
Ayhan Ceylan, Behlül Numan Özdemir
8. Ulusal Mühendislik Ölçmeleri Sempozyumu
2016
Satellite and Terrestrial Radio Positioning for Indoor Location
Behlül Numan Özdemir, Ayhan Ceylan
International Scientific Conference On Applied Sciences, ”Spatial Data Processing, Modelling, Analysing and Management for Knowledge Based Systems
2015
Utility Software for Web Based PPP Applications for Automated Data Processing
Behlül Numan Özdemir, Salih Alçay, Cemal Özer Yiğit, Ayhan Ceylan
FIG Working Week 2015
2015
Evaluating the Performance of Kinematic PPP and Differential Kinematic Methods in Rural and Urban Areas
Ayhan Ceylan, Cemal Özer Yiğit, Salih Alçay, Behlül Numan Özdemir
FIG Working Week 2015
2014
Kinematik PPP ve Post Process Kinematic Yöntemlerinin Kırsal ve Meskun Alanlardaki Performanslarının Karşılaştırılması
Ayhan Ceylan, Cemal Özer Yiğit, Salih Alçay, Behlül Numan Özdemir
7. Mühendislik Ölçmeleri Sempozyumu
2014
Kapalı Mekânlarda Uygulanan Konum Belirleme Yöntemleri ve Karşılaştırılması
Behlül Numan Özdemir, Ayhan Ceylan, Salih Alçay, Cemal Özer Yiğit
7. Mühendislik Ölçmeleri Sempozyumu