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Year 2019, Volume 6 , Issue 3, Pages 642 - 658 2019-09-30

Çoklu-Gnss’in (MGEX) Türkiye Üzerinde Hassas Nokta Konumlandirmasina Katkisi: Gözlem Süresi ve Uydu Geometrisinin Değerlendirilmesi Üzerine Bir Çalışma
The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry

Sermet OĞÜTCÜ [1]

Abstract

Uydu yörünge sistemini tamamlamış GPS ve GLONASS sistemlerine ilave olarak GALILEO ve BeiDou uydu navigasyon sistemleri tam kapasite uydu yörünge sistemine geçebilmek için hızlı bir şekilde güncellenmektedir. Uluslararası GNSS servisi (IGS) gelişen farklı uydu sistemleri için çoklu-GNSS hizmetini (IGS-MGEX) başlatmıştır. Sayısı artmakta olan özellikle Galileo ve BeiDou uydu navigasyon sistemleri kullanılarak dört farklı küresel navigasyon amaçlı hizmet veren GPS, GLONASS, GALILEO ve BeiDou uyduları kullanılarak hassas nokta konumlama (PPP) yapılabilmektedir. Bu çalışmada GPS, GLONASS, GALILEO ve BeiDou uydularından yararlanılarak (GPS, GPS-GLONASS, GPS-GLONASS-GALILEO ve GPS-GLONASS-GALILEO-BeiDou kombinasyonları ile) farklı oturum süreleri (24-12-6-3-1 saat) ve uydu yüksek açıları (7°-15°-30°) için PPP doğruluk performansı Türkiye ve çevresi için analiz edilmiştir. 20-30 Kasım 2018 tarihleri arasında 10 gün ve altı adet IGS-MGEX istasyonu Türkiye içinde ve çevresinde olmak üzere seçilmiştir. Sonuçlar, çoklu GNSS kullanılarak yapılan PPP değerlendirmelerinde yatay ve düşey doğruluğun tek GPS uydusu kullanılarak yapılan PPP değerlendirmesine göre daha yüksek çıktığını göstermektedir. Özellikle uydu yükseklik açısı artıkça tek GPS sistemine göre çoklu-GNSS değerlendirmesindeki doğruluğun çok daha fazla arttığı gözlemlenmektedir. Çoklu-GNSS değerlendirmesindeki düşey doğruluktaki artışın yatay doğruluğa göre çoğu istasyon için daha fazla olduğu görülmektedir. Sonuçlar aynı zamanda kısa oturum sürelerindeki uyuşumsuz ölçülerin çoklu GNSS kullanılarak önemli oranda azaldığını göstermektedir.

In addition to the legacy GPS and GLONASS, new emerging systems, e.g. European Galileo and Chinese BeiDou became operational for positioning, timing and navigation purposes. The International GNSS Service (IGS) has initiated the Multi-GNSS Experiment for adaptation of new emerging systems. An increasing number of satellites of GNSS and their constant modernization allow conducting precise point positioning (PPP) with four constellations, namely GPS, BeiDou, GLONASS and Galileo. In this paper, the performance of quad-constellation PPP over Turkey is investigated using different observation time (24-, 12-, 6-, 3-, and 1-h) and elevation cutoff angles (7°-15°-30°). Ten consecutive days in 2018 (DOY: 324-333) and six IGS-MGEX stations are chosen within and around Turkey to conduct quad-constellation PPP. The results indicate that quad-constellation PPP increases the horizontal and vertical accuracy compared to the GPS only PPP. As the elevation cutoff angle increases, the accuracy improvements are getting higher compared to the unconstrained environment. The improvements in the vertical component are much higher than the horizontal component for most of the stations. The results also reveal that the number of outliers is significantly low for multi-GNSS PPP compared to the GPS only PPP, especially for short observation time.         

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Details

Primary Language en
Subjects Engineering
Journal Section Makaleler
Authors

Orcid: 0000-0002-2680-1856
Author: Sermet OĞÜTCÜ (Primary Author)
Institution: NECMETTİN ERBAKAN ÜNİVERSİTESİ
Country: Turkey
Supporting Institution Necmettin Erbakan University Scientific Research Project
Project Number 191219003
Dates

Application Date : May 13, 2019
Acceptance Date : July 6, 2019
Publication Date : September 30, 2019

Cite

Bibtex @research article { ecjse563802, journal = {El-Cezeri Journal of Science and Engineering}, issn = {2148-3736}, eissn = {2148-3736}, address = {}, publisher = {Selami ŞAŞMAZ}, year = {2019}, volume = {6}, pages = {642 - 658}, doi = {10.31202/ecjse.563802}, title = {The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry}, key = {cite}, author = {Oğütcü, Sermet} }
APA Oğütcü, S . (2019). The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry . El-Cezeri Journal of Science and Engineering , 6 (3) , 642-658 . DOI: 10.31202/ecjse.563802
MLA Oğütcü, S . "The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry" . El-Cezeri Journal of Science and Engineering 6 (2019 ): 642-658 <https://dergipark.org.tr/en/pub/ecjse/issue/49096/563802>
Chicago Oğütcü, S . "The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry". El-Cezeri Journal of Science and Engineering 6 (2019 ): 642-658
RIS TY - JOUR T1 - The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry AU - Sermet Oğütcü Y1 - 2019 PY - 2019 N1 - doi: 10.31202/ecjse.563802 DO - 10.31202/ecjse.563802 T2 - El-Cezeri Journal of Science and Engineering JF - Journal JO - JOR SP - 642 EP - 658 VL - 6 IS - 3 SN - 2148-3736-2148-3736 M3 - doi: 10.31202/ecjse.563802 UR - https://doi.org/10.31202/ecjse.563802 Y2 - 2019 ER -
EndNote %0 El-Cezeri Journal of Science and Engineering The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry %A Sermet Oğütcü %T The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry %D 2019 %J El-Cezeri Journal of Science and Engineering %P 2148-3736-2148-3736 %V 6 %N 3 %R doi: 10.31202/ecjse.563802 %U 10.31202/ecjse.563802
ISNAD Oğütcü, Sermet . "The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry". El-Cezeri Journal of Science and Engineering 6 / 3 (September 2019): 642-658 . https://doi.org/10.31202/ecjse.563802
AMA Oğütcü S . The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry. ECJSE. 2019; 6(3): 642-658.
Vancouver Oğütcü S . The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry. El-Cezeri Journal of Science and Engineering. 2019; 6(3): 642-658.
IEEE S. Oğütcü , "The contribution of Multi-GNSS Experiment (MGEX) to precise point positioning over Turkey: Consideration of observation time and satellite geometry", El-Cezeri Journal of Science and Engineering, vol. 6, no. 3, pp. 642-658, Sep. 2019, doi:10.31202/ecjse.563802
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