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Evaluation of Precise Point Positioning (PPP) Performance Using Various Global Navigation Satellite Systems (GNSS).
Oral Presentation
Authors
1civil engineering ,assiut university,egypt
2Faculty of Eng., Assiut Univ., Egypt,
3Civil Engineering Department,Faculty of Engineering ,Assiut University
4Faculty of Eng., Assiut Univ., Egypt
Abstract
Global navigation satellite system (GNSS) has a wide range of applications in civil engineering such as establishing control points, monitoring large structures deflection, mining plant and drilling rig. In order to achieve high accuracy, short observation time and avoid errors affecting GNSS positioning accuracy, we need to use differential GNSS (DGNSS) technique with at least two receivers, consequently the cost required is too high. Using single GNSS receiver without affecting positioning accuracy will lead to reduce cost and effort.
Precise Point Positioning (PPP) technique is a positioning method that removes or models GNSS system errors to provide high location accuracy by processing both code and carrier phase observations using a single GNSS receiver by using satellite clock and orbit products broadcast from a global network reference stations which are available in online PPP-services. Having several constellations that can be used for positioning such as (GPS, GLONASS, GALILIEO, and BEDIOU) offers redundant coverage between constellations and maintains continuous positioning.
This paper tests different positioning models to make full use of all available observations from different GNSS. The impact of satellite visibility and positional dilution of precision (PDOP) of different constellations are carefully analyzed and compared to assess their individual performance. Overall, BEDIOU system achieved the best positioning precision performance than other system, accuracy obtained are 1.5cm, 4.6cm, and 1.7cm for the east, north, and height, respectively. GALILIEO achieved highest accuracy compared to GPS and GLONASS were accuracy obtained by Galileo are 4.1cm, 4.2cm, and 6.4cm for the east, north, and height.
Precise Point Positioning (PPP) technique is a positioning method that removes or models GNSS system errors to provide high location accuracy by processing both code and carrier phase observations using a single GNSS receiver by using satellite clock and orbit products broadcast from a global network reference stations which are available in online PPP-services. Having several constellations that can be used for positioning such as (GPS, GLONASS, GALILIEO, and BEDIOU) offers redundant coverage between constellations and maintains continuous positioning.
This paper tests different positioning models to make full use of all available observations from different GNSS. The impact of satellite visibility and positional dilution of precision (PDOP) of different constellations are carefully analyzed and compared to assess their individual performance. Overall, BEDIOU system achieved the best positioning precision performance than other system, accuracy obtained are 1.5cm, 4.6cm, and 1.7cm for the east, north, and height, respectively. GALILIEO achieved highest accuracy compared to GPS and GLONASS were accuracy obtained by Galileo are 4.1cm, 4.2cm, and 6.4cm for the east, north, and height.
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