PROJECT TITLE :
A Worldwide Ionospheric Model for Fast Precise Point Positioning
Fast precise purpose positioning (Quick-PPP) could be a satellite-primarily based navigation technique using an accurate real-time ionospheric modeling to achieve high accuracy quickly. In this paper, an end-to-finish performance assessment of Quick-PPP is presented in close to-maximum Solar Cycle conditions; from the accuracy of the Central Processing Facility corrections, to the user positioning. A planetary distribution of permanent receivers as well as challenging conditions at equatorial latitudes, is navigated in pure kinematic mode, located from 100 to 1300 km aloof from the closest reference station used to derive the ionospheric model. It's shown that satellite orbits and clocks accurate to few centimeters and few tenths of nanoseconds, employed in conjunction with an ionosphere with an accuracy better than one Total Electron Content Unit (16 cm in L1) reduce the convergence time of twin-frequency Precise Point Positioning, to decimeter-level (3-D) solutions. Horizontal convergence times are shortened forty% to 90%, whereas the vertical parts are reduced by twenty% to 60%. A metric to evaluate the standard of any ionospheric model for Global Navigation Satellite System is additionally proposed. The ionospheric modeling accuracy is directly translated to mass-market single-frequency users. The 95th percentile of horizontal and vertical accuracies is shown to be 40 and sixty cm for single-frequency users and nine and 16 cm for twin-frequency users. The tradeoff between the formal and actual positioning errors has been fastidiously studied to set realistic confidence levels to the corrections.
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