Deniz seviyesi değişimlerinin belirlenmesinde GNSS-IR yönteminin kullanımı ve doğruluk analizi üzerine bir araştırma

Year 2022, Volume: 7 Issue: 3, 187 - 196, 15.12.2022

Cemali Altuntaş , Nursu Tunalıoğlu

https://doi.org/10.29128/geomatik.946594

Cited By: 2

Abstract

GNSS İnterferometrik Reflektometri (GNSS-IR) yöntemi, GNSS verilerinin analizi ile anten etrafındaki çevresel özelliklerin kestirimine olanak sağlamaktadır. Deniz kıyısındaki GNSS antenlerinin, deniz yüzeyinden yansıma alabilecek kadar yeterli açık görüş açısına sahip olması durumunda, GNSS-IR yöntemine dayalı olarak deniz seviyesi değişimleri belirlenebilmektedir. Bu çalışmada, deniz seviyesi değişimlerinin GNSS-IR yöntemine dayalı olarak belirlenebilirliği, TUSAGA-Aktif ağına ait istasyonlardan Tekirdağ (TEKR) istasyonunun 2020 yılına ait bir yıllık statik GPS uydu verileri ile SNR1 ve SNR2 (L1 ve L2 frekansları) için ayrı ayrı analiz edilmiştir. Analizlerde frekans limiti, uydu yükseklik açısı limiti, spektral analiz ile elde edilen arka plan gürültü koşulu (AGK) ve medyan mutlak sapma (MAD) koşulu dikkate alınmıştır. Verilerin değerlendirilmesi için 18 farklı analiz stratejisi oluşturulmuş ve kestirimler için doğrulama verisi olarak TUDES Marmara Ereğlisi mareograf istasyonunun sağladığı deniz seviyesi ölçüleri kullanılmıştır. Sonuçlar, veriden elde edilen kestirim sayısı (KS) ve 1 yıllık veride toplam günlük kestirim kapsam sayısı bakımından da incelenmiştir. Buna göre, 1 yıllık veri için en yüksek korelasyon SNR1 ile 5°-20° yükseklik açısı ve 5AGK koşulu için %75 (KS: 1911, Kapsam: 279) olarak bulunmuştur. Yıllık veri için en yüksek korelasyonun elde edildiği strateji ile aylık değerlendirmeler yapıldığında ise SNR1 için %84’e, SNR2 için ise %88’e varan korelasyon değerleri elde edilmiştir.

Keywords

GNSS-İnterferometrik Reflektometri (GNSS-IR), Deniz Seviyesi, Lomb-Scargle Periyodogramı (LSP), Sinyal-Gürültü Oranı (SNR).

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