Gerçek-Zamanlı GNSS VADASE Yaklaşımının Düşey Yönlü Dinamik Hareketleri Yakalayabilme Kabiliyetinin İncelenmesi

Year 2022, Volume: 22 Issue: 3, 626 - 636, 30.06.2022

Barış Karadeniz , Mert Bezcioğlu , Cemal Özer Yiğit , Ahmet Anıl Dindar , Özgür Avcı

https://doi.org/10.35414/akufemubid.1066489

Abstract

Yeryüzünde meydana gelen dinamik hareketlerin tespit edilmesinde GNSS (Global Navigation Satellite System) sensörüne dayalı birçok konum belirleme yöntemi (Bağıl Kinematik, Gerçek Zamanlı Kinematik (RTK), Hassas Nokta Konumlama (PPP), Gerçek Zamanlı (RT)-PPP vb.) kullanılmıştır. Kullanılan bu yöntemler ikinci bir GNSS alıcısı, internet bağlantısı, uydu yörünge ve saat düzeltme bilgisi gibi harici parametreler gerektirir. Bu çalışmada herhangi bir harici parametreye ihtiyaç duymadan gerçek zamanlı (Real-Time) dinamik hareketleri doğrudan yakalayabilen VADASE (Variometric Approach for Displacement Analysis Stand-Alone Engine) yaklaşımının düşey yönlü dinamik davranışları belirleyebilme yeteneği incelenmiştir. Çoklu-GNSS gözlemlerine dayalı bu yöntem, zaman ve frekans alanında bağıl konum belirleme (RP) yöntemi referans alınarak PPP yöntemi ile karşılaştırılmıştır. Sonuçlara bakıldığında düşey dinamik hareketlerin baskın frekans değerlerinin üç yöntem için de aynı olduğu görülmüştür. Baskın frekansa karşılık gelen genlik değerlerinde ise deneylerde referans alınan RP yöntemine göre RT-VADASE yönteminde 1.6 mm ila 3.2 mm arasında değişmekteyken PPP yönteminde bu farklılık 1.1 mm ila 1.6 mm arasında değişmektedir. Ayrıca zaman alanında tüm deney durumlarına incelendiğinde RT-VADASE yönteminin PP-PPP yöntemine göre KOH değerleri arasında milimetre düzeyinde (1-2mm) küçük farklılık bulunmaktadır. Sonuçlar, RT-VADASE yaklaşımının anlık olarak düşey dinamik hareketleri doğru ve güvenilir bir şekilde tespit edebileceğini göstermektedir. Bununla birlikte, RT-VADASE yöntemi deprem, rüzgâr, trafik yükü gibi dinamik yüklerin, yapıda meydana getirebileceği etkiyi anlık olarak tespit etmek ve yapı sağlığını tehdit edebilecek durumlarda yapının hızlı tehlike değerlendirilmesi yapılarak insan hayatını tehlikeye düşürecek durumlarda erken uyarı sistemine entegre bir sensör olarak kullanılabileceği gösterilmiştir.

Keywords

GNSS, VADASE, PPP, Dinamik Hareket

Thanks

Bu çalışmada sağlamış oldukları donanım ve yazılım destekleri için Sistem A.Ş.’ye, PP-PPP çözümde kullanılan açık kaynaklı RTKLIB yazılımı için Araştırmacı Tomoji Takasu’ya ve Çoklu-GNSS uydu yörünge ve saat düzeltmesi sağlayan Uluslararası GNSS Servisine teşekkür ederiz.

Investigation of Real-Time GNSS VADASE Approach Capability of Capturing Vertical Dynamic Movements

Abstract

Many positioning methods (Relative Kinematic, Real Time Kinematic (RTK), Pricese Point Positioning (PPP) and Real Time (RT)-PPP etc.) based on GNSS sensor have been used to detect dynamic motions occurring on the earth. These methods used require external parameters such as a second GNSS receiver, internet connection, satellite orbit and clock correction information. In this study, the VADASE (Variometric Approach for Displacement Analysis Stand-Alone Engine) approach, which can directly capture dynamic motions in real-time without the need for any additional parameters, are examined. This method, based on multi-GNSS observations, was compared with the PPP method, with reference to the Relative Positioning(RP) method in the time and frequency domain. According to the results, it was seen that the dominant frequency values of vertical dynamic motions were the same for all three methods. While the amplitude values corresponding to the dominant frequency vary between 1.6 mm and 3.2 mm in the RT-VADASE method according to the RP method referenced in the experiments, this difference varies between 1.1 mm and 1.6 mm in the PPP method. In addition, when all experimental cases are examined in the time domain, there is a small (1-2mm) difference between the KOH values of the RT-VADASE method compared to the PP-PPP method. The results show that the RT-VADASE approach can accurately and reliably detect instantaneous vertical dynamic motions. However, it has been shown that the RT-VADASE method can be used as an integrated sensor in the early warning system in situations that will endanger human life by making a rapid hazard assessment of the structure in cases that may threaten the health of the structure, instantly detecting the effect of dynamic loads such as earthquake, wind, traffic load.

Keywords

GNSS, VADASE, PPP, Dynamic Motion

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