GPS/Galileo PPP-AR ve PPP Yöntemlerinin Doğruluklarının Gözlem Süresi ve Uydu Kombinasyonları Açısından İncelenmesi

Year 2021, Volume: 21 Issue: 6, 1377 - 1392, 31.12.2021

Barış Karadeniz Mert Bezcioğlu Ömer Faruk Bilgen Cemal Özer Yiğit

https://doi.org/10.35414/akufemubid.1003382

Cited By: 2

Abstract

Bu çalışmada farklı enlemlerde seçilen üç farklı Uluslararası GNSS Servisi (IGS) istasyonunun ardışık 15 günlük GPS/Galileo gözlem verileri kullanılmış, elde edilen bu gözlemler, hem geleneksel-PPP hem de PPP-AR teknikleri kullanılarak statik modda değerlendirilmiştir. Kısa ve uzun ölçü süresinin yöntemler üzerindeki etkisini değerlendirmek için, üç farklı istasyondan elde edilen gözlem dosyaları 0.75, 1, 1.5, 2, 3, 4 ve 24 saatlik verilere ayrılmış, Galileo uydu gözlemlerinin GPS uydu gözlemlerine katkısını incelemek için PPP ve PPP-AR yöntemleri sadece-GPS ve GPS/Galileo uydu kombinasyonları açısından da incelenmiştir. Sonuçlar gözlem sürelerinin artması ile PPP yönteminde konum doğruluğunun arttığını ve PPP-AR tekniğinde ise faz başlangıç belirsizliğinin yanlış değere sabitlenme riskini azalttığını göstermiştir. Çalışmanın bulguları, PPP ve PPP-AR tekniklerinde Galileo uydu sisteminin GPS gözlemlerine dahil edilmesiyle konum doğruluğunun geliştiğini, PPP ve PPP-AR yöntemlerinin birbirleriyle karşılaştırıldıklarında ise PPP-AR yönteminin konum doğruluğunun genellikle tüm ölçü sürelerinde PPP yönteminden daha iyi çıktığı açıkça ifade edilmektedir.

Keywords

GPS, Galileo, PPP, PPP-AR, IGS, MGEX

Thanks

Bu çalışmada PPP ve PPP-AR çözümlerinde kullanılan açık kaynak Net_Diff yazılımı için Dr. Yize Zhang’a teşekkür ederiz.

Investigating the Accuracy of GPS/Galileo PPP-AR and PPP Methods In Terms of Observation Duration and Satellite Combinations

Abstract

In this study, 15 consecutive days of GPS/Galileo observations of three different International GNSS Service (IGS) stations selected at different latitudes were used, and these observations were evaluated in static mode using both traditional-PPP and PPP-AR techniques. In order to evaluate the effect of short and long observation duration on discussed the methods, observation files obtained from three different stations were divided into 0.75, 1, 1.5, 2, 3, 4 and 24 hour data. In order to examine the contribution of Galileo satellite observations to GPS satellite observations, PPP and PPP-AR methods were also examined in terms of GPS-only and GPS/Galileo satellite combinations. The results showed that with the increase of the observation duration, the position accuracy increased in the PPP method and the risk of fixing wrong integer ambiguity in the PPP-AR technique was reduced. The findings of the study clearly state that in PPP and PPP-AR techniques, the inclusion of Galileo observations to GPS has improved the positioning accuracy, and when the PPP and PPP-AR methods are compared with each other, the horizontal positioning accuracy of the PPP-AR method is generally better than the PPP method at all observation periods.

Keywords

GPS, Galileo, PPP, PPP-AR, IGS, MGEX

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• 1- https://github.com/YizeZhang/Net_Diff(20.08.2021)
• 2-https://cddis.nasa.gov/archive/gnss/data/daily/2020/ (05.09.2021)
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