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Düşük maliyetli GNSS gözlemlerine dayalı gerçek-zamanlı hassas nokta konum belirleme (RT-PPP) tekniğinin performansının değerlendirilmesi ve çoklu-GNSS gözlemlerinin katkısı

Bu çalışma, düşük maliyetli Küresel Uydu Navigasyon Sistemi (Global Navigation Satellite Systems -GNSS-) gözlemlerine dayalı Gerçek-Zamanlı Hassas Nokta Konum Belirleme (Real-Time Precise Point Positioning -RT-PPP-) tekniğinin konum belirleme performansının araştırılmasını ve yönteme çoklu-GNSS gözlemlerinin katkısını sunmaktadır. Çalışmada, iki adet düşük maliyetli u-blox ZED-F9P alıcısı ve ANN-MB-00 anteni kullanılarak statik ve kinematik modda iki farklı deney gerçekleştirilmiştir. Gerçekleştirilen iki deney setinde de Küresel Konum Belirleme Sistemi (Global Positioning System -GPS-) ve GPS+Galileo gözlemlerine dayalı olarak IGS03 akışından elde edilen gerçek-zamanlı hassas yörünge ve saat düzeltmelerinden elde edilen ürünlerle RT-PPP çözümleri gerçekleştirilmiş ve bu sonuçlar, GPS+Galileo gözlemlerine dayalı Gerçek-Zamanlı Kinematik (Real-Time Kinematic -RTK-) verileri ile karşılaştırılmıştır. Statik modda gerçekleştirilen deneyin bulguları, çoklu-GNSS gözlemlerinin sadece-GPS gözlemlerine kıyasla yaklaşık olarak 30 dakika daha erken yakınsadığını ve sağa, yukarı ve h bileşenleri için sırasıyla ±3, ±11 ve ±6 cm mertebesinde daha hassas konum doğruluğu sağladığını açıkça göstermektedir. Kinematik deney sonuçları ise çoklu-GNSS gözlemlerinin tek sisteme kıyasla elde edilen konum doğruluğunu yatay ve düşey bileşenler için sırasıyla %33 ve %25 oranında iyileştirdiğini ifade etmektedir. Ancak, her iki deneyden elde edilen sonuçların dm mertebesinde olduğu göz önüne alındığında, düşük maliyetli GNSS gözlemlerine dayalı RT-PPP tekniğinin yüksek doğruluk gerektiren jeodezik uygulamalarda yeterli olmayacağını, buna karşılık navigasyon uygulamaları için yeterli doğruluk sağladığı açıktır.

Anahtar Kelimeler:

GNSS, Düşük-maliyetli GNSS, RTK, RT-PPP, u-blox

Evaluation of the performance of the real-time precise point positioning (RT-PPP) technique based on low-cost GNSS observations and contribution of multi-GNSS observations

This study presents an investigation of the positioning performance of the Real-Time Precise Point Positioning (RT-PPP) technique based on low-cost Global Navigation Satellite Systems (GNSS) observations and the contribution of multi-GNSS observations to the method. In the study, two different experiments were performed in static and kinematic modes employing two low-cost u-blox ZED-F9P receivers and ANN-MB-00 antennas. In both experiments, RT-PPP solutions were performed using the products obtained from the real-time precise orbit and clock corrections from the IGS03 stream based on Global Positioning System (GPS) and GPS+Galileo observations, and these results were compared with the Real-Time Kinematic (RTK) data based on GPS+Galileo observations. The findings of the experiment realized in static mode clearly demonstrated that the multi-GNSS observations converge about 30 minutes earlier than GPS-only observations and provide approximately ±3, ±11, and ±6 cm more precise position accuracy for the east, north, and up components, respectively. The kinematic test results indicated that the multi-GNSS observations improved the position accuracy obtained compared to a single system by 33% and 25% for horizontal and vertical components, respectively. However, considering that the results obtained from both experiments are in the order of dm, it is clear that the RT-PPP technique based on low-cost GNSS observations will not be sufficient in geodetic applications that require high accuracy, whereas it provides sufficient accuracy for navigation applications.

Keywords:

GNSS, Low-cost GNSS, RTK, RT-PPP, u-blox,

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