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Over the equatorial region, the inhomogeneous formation of the ionosphere introduces greater ionospheric horizontal gradient which could give greater positioning error for a user station in a DGPS system. Furthermore, the difference in the elevation angle of the user station that `views' the same GPS satellite as the reference station also introduces range measurement errors at mm to cm levels. In...
A new approach to resolve integer ambiguity and achieve instantaneous spacecraft attitude from phase information of Global Positioning System (GPS) signals, without requiring independent attitude information from traditional attitude sensors is presented. A newly approached algorithm based on Gram-Schmidt orthonormalisation (GSO) is proposed for medium length baseline observations. By using a newly...
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