The Analysis of GPS Data in Different Observation Periods Using Online GNSS Process Services

Yıl 2017, Cilt: 4 Sayı: 1, 43 - 53, 01.03.2017

Sümeyra Gülmez Ekrem Tuşat

https://doi.org/10.30897/ijegeo.306492

Cited By: 2

Öz

The usability and the accuracy of internet-based position determination services which have gained importance
in recent years is one of the up-to-date subjects of studies. Online processing services have more advantages
than commercial and scientific software; since they are easy to use, require less experience and free because
they get quick results. In this study, GPS observation files in rinex format belonging to 6 stations were
evaluated using Auspos, Magic-GNSS and Opus services then the results were obtained. Three systems
showed the similar results for the results obtained according to 24-hour measurement period. In the second
study, observation files were divided into 12, 6 and 2 hour groups and after the results were obtained they were
compared to 24-hour results. According to the reports, it was seen that the accuracy decreased as the
observation period got shorter. In all three systems, 24 and 12-hour observation accuracy occurs in cm
measures. In 6 and 2 hour periods where the observation period is shorter, accuracy value reaches to 3-4 cm.
According to these results, it is seen that although it generally depends on observation period, internet-based
position determination services sustain adequate accuracy for basic geodetic network application that the
topographical engineering needs.

Anahtar Kelimeler

GPS, Geodetic networks

Kaynakça

• Alçay, S., Yiğit, C. Ö. ve Ceylan, A., 2013, CSRS-PPP, Magic GNSS ve APPS Web Tabanlı Yazılımların Statik PPP Modüllerinin Karşılaştırılması, Harita Teknolojileri Elektronik Dergisi, 5 (1), 1 - 12. (In Turkish)
• Alkan, R. M., İlçi, V. ve Ozulu, M., 2014, PPP Yönteminde GPS ve GLONASS Uydularının Kullanımının Nokta Konum Doğruluğuna Etkisinin Araştırılması, Harita Teknolojileri Elektronik Dergisi, 6 (2), 27-34.(In Turkish)
• Anonymous, 2016, GPS, https://tr.wikipedia.org/wiki/GPS:
• Bahadur, B. ve Üstün, A., 2014, İnternet Tabanlı GNSS Veri Değerlendirme Servisleri Harita Dergisi, 152, 40-50. (In Turkish)
• Ghoddousi-Fard, R. ve Dare, P., 2006, Online GPS processing services: an initial study, GPS Solutions, 10 (1), 12-20.
• Grewal, M. S., Weill, L. R. ve Andrews, A. P., 2007, Global Positioning Systems, Inertial Navigation, and Integration, Wiley, p.
• Hoffman-Wellenhof, B., Lichtenegger, H. ve Collins, J., 2001, Global positioning system: theory and practice, New York, Springer-Verlag, p.
• Liu, J.-H. ve Shih, T.-Y., 2007, A Performance Evaluation of the Internet Based Static GPS Computation Services, Survey Review, 39 (304), 166-175.
• MacDonald, D., 2002, Auto-GIPSY, GrafNet, OPUS and SCOUT: A Comparison Scripps Orbit and Permanent Array Center (SOPAC), San Diego, USA.
• Subaşı, H. K. ve Alkan, R. M., 2011, İnternet-Tabanlı GPS Değerlendirme Servislerinin Doğruluk Analizi: İstanbul Örneği. 13. Türkiye Harita Bilimsel ve Teknik Kurultayı. Ankara, TMMOB Harita ve Kadastro Mühendisleri Odası. (In Turkish)
• Tsakiri, M., 2008, GPS Processing Using Online Services, Journal of Surveying Engineering, 134 (4), 115-125.
• Urquhart, L., Santos, M. C., Garcia, C. A., Langley, R. B. ve Leandro, R. F., 2014, Global Assessment of UNB’s Online Precise Point Positioning Software, In: Earth on the Edge: Science for a Sustainable Planet: Proceedings of the IAG General Assembly, Melbourne, Australia, June 28 - July 2, 2011, Eds: Rizos, C. ve Willis, P., Berlin, Heidelberg: Springer Berlin Heidelberg, p. 585-589.
• Yılmaz, H., 2011, Cors-Tr Verileriyle Belirlenen Türkiye Tektonik Plaka Hareketlerinin Görselleştirilmesi, Master of Science, İstanbul Kültür Üniversitesi Fen Bilimleri Enstitüsü Yüksek Lisans Tezi, 61 s, İstanbul. (In Turkish)