Journal of Emerging Trends in Engineering and Applied Sciences: Research Areas

Article Title: Establishment of Geodetic Control in Jebba Dam using CSRS - PPP Processing Software
by R. Ehigiator-Irughe; M. O. Ehigiator and S. A. Uzoekwe

Abstract:
Most GPS users who require higher precision now operate differentially with respect to a known reference station to eliminate the effects of SA and significantly reduce common station errors. As the distance between a roving receiver and its reference increases, the commonality of errors is reduced and applying range corrections from a single reference station may not provide optimal results for point positioning. Daily, the Geodetic Survey Division (GSD), Natural Resources Canada (NRCan) generates precise GNSS satellite orbits and clocks in a standard format which are contributed to the International GNSS Service for Geodynamics (IGS). Higher frequency satellite clocks are subsequently computed from the Canadian Active Control System (CACS). New developments in GNSS positioning show that a user with a single GNSS receiver can obtain positioning accuracy comparable to that of differential positioning (i.e., centimeter to decimeter accuracy). In this study, the GPS data for a control point BM_AMOS was submitted to CSRS for post processing. Sources of errors and the model used in the solution are discussed. The earth and space based models for attaining the derived accuracies is highlighted

Keywords: GNSS, PPP Model, ITRF, IGS, Ionospheric delay, BM_AMOS

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