Abstract:In this paper, a structure of precise positioning based on satellite navigation system is proposed. The proposed system is consisted with three parts, range domain filter, navigation filter and position domain filter. The range domain filter generates carrier phase-smoothed-Doppler and Doppler-smoothed-code measurements. And the navigation filter calculates position and velocity using double-differenced code/carrier phase/Doppler measurements. Finally, position domain filter smooth position error, and it means enhancement of positioning performance. The proposed positioning method is evaluated by trajectory analysis using precise map date. As a result, the position error occurred by multipath or cycle slip was reduced and the calculated trajectory was in true lane.
ÖZETGPS sisteminin jeodezik çalışmalarda kullanımı, gün geçtikçe yaygınlaşmakta ve bu sistem adım adım haritacılık sektöründe zirveye tırmanmaktadır. Faz ölçüleri kullanmak suretiyle mm mertebesinde duyarlık elde edilmesi, her türlü hava koşullarında gözlem yapılması, noktaların birbirlerini görme şartı olmaması ise tercih unsurunu artırmaktadır. Ayrıca, her geçen gün ölçü tekniklerinin geliştirilmesi, deformasyon ölçmeleri, fay hareketlerinin izlenmesi, duyarlı jeoid haritalarının çıkarılması, halihazır harita yapımı vb. çalışmalarda GPS'in kullanımını yaygınlaştırmıştır.Anahtar Kelimeler : Global konum belirleme sistemi, Jeodezi, Haritacılık GLOBAL POSITIONING SYSTEM (GPS) ABSTRACTUse of GPS is becoming more widespread on surveying engineering. Especially, preference to GPS is increased by getting accuracy of order of milimeter, making observation on every weather forecast, without requiring intervisibility between station. Besides, developing new observation techniques and technologies in GPS increased its use in deformation measurements, monitoring crustal movements, mapping precise geoid maps, detail surveying, etc.
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