000196302 001__ 196302
000196302 003__ CZ-ZdVUG
000196302 005__ 20210818123244.0
000196302 041__ $$aeng
000196302 040__ $$aABC039$$bcze
000196302 1001_ $$aNesvadba, Otakar
000196302 24510 $$aComparison and Assessment of Float, Fixed, and Smoothed Precise Point Positioning
000196302 300__ $$a12 stran
000196302 5203_ $$9eng$$aPrecise Point Positioning (PPP) has been considered a powerful method for GNSS data processing. The essential input products, such as precise satellite orbits and clocks, are provided within the International GNSS Service (IGS) with a sufficient quality for estimating receiver coordinates with centimeter level accuracy. However, the IGS satellite clocks enable users to estimate ambiguities only as float values. An additional product for satellite phase biases is necessary for an integer ambiguity resolution (PPP AR). Another approach is the backward smoothing algorithm utilizing already precise and converged parameters for improving those parameters estimated at previous epochs. All the three approaches for ambiguity estimation are compared and assessed in terms of advantages and disadvantages, achieved coordinates precision, and flexibility. The comparison are performed through a processing of GNSS data from selected IGS permanent stations during 30 days in 2018, and a processing of high rate GNSS observations of the station STRF in Greece collected during the seismic event occurred on October 25, 2018. The backward smoothing improved the float solution similarly like the PPP AR, and therefore can be considered an alternative approach providing easier implementation and no dependency on additional satellites products. We utilized two different products for phase biases in the PPP AR, namely Integer Recovery Clocks (IRC) provided by the Centre National d'Etudes Spatiales/Collecte Localisation Satellites (CNES/CLS) analyses center and Fractional Cycle Biases (FCB) which were estimated at the Geodetic Observatory Pecny (GOP) analyses. The IRC is based on the assimilation phase biases into satellite clocks, while the FCB products are distributed in terms of wide-lane and narrow-lane biases. A similar accuracy obtained from our comparison indicates an interoperability of products when using different strategies and even different software.
000196302 655_4 $$ačlánek v časopise
000196302 7001_ $$aVáclavovic, Pavel
000196302 7730_ $$92020$$dČeská republika,2020.$$g17. (3), s.329-340$$tACTA GEODYNAMICA ET GEOMATERIALIA$$x1214-9705
000196302 8564_ $$uhttps://www.irsm.cas.cz/materialy/acta_content/2020_doi/Vaclavovic_AGG_2020_0024.pdf
000196302 85642 $$ahttps://www.isvavai.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F20%3AN0000011%21RIV21-MSM-00025615
000196302 910__ $$aABC039
000196302 980__ $$aclanky_vugtk
000196302 985__ $$avaclavovic
000196302 985__ $$ariv
000196302 985__ $$autvar24