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- W2042230628 abstract "Abstract The NAVSTAR Global Positioning System (GPS) is a satellite-based radionavigation system designed for positioning, velocity determination and timing. The relative movement between a GPS receiver and a GPS satellite causes the received signal frequency to differ from the transmitted frequency due to the Doppler effect. This frequency difference, an observable in GPS measurements, is referred to as the Doppler shift. However, the Doppler shift is biased by the inherent errors in the signal propagation. Since velocities of GPS satellites are known, the velocity of a user can be determined through observing four or more satellites, similar to GPS positioning.When the GPS selective availability (SA) was activated, errors imposed on the ephemeris and satellite clocks significantly affected the accuracy of both GPS positioning and velocity determination. The removal of SA has enabled a significant improvement on the accuracy of both GPS satellite orbits and clocks. As a result, velocity accuracy at sub-c..." @default.
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- W2042230628 date "2008-10-01" @default.
- W2042230628 modified "2023-09-27" @default.
- W2042230628 title "On Real-Time High Precision Velocity Determination for Standalone GPS Users" @default.
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- W2042230628 doi "https://doi.org/10.1179/003962608x325420" @default.
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