ORBIT DETERMINATION MODELING ANALYSIS BY GPS.
- Professor of Space Dynamics, Cairo University, Faculty of Science, Egypt.
- Associated Professor of Space Dynamics National Research Institute of astronomy and Geophysics (NRIAG), Egypt.
- Master degree student in Cairo University, Faculty of Science, Egypt.
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The purpose of this paper was to analyze the modeling of a GPS satellite orbit, The Global Positioning System (GPS) is a satellite navigation system for determining position, velocity and time with high accuracy, using signals of the GPS constellation (RINEX files), with the aim of analyzing the performance of the orbit. One pursues to verify how differences of modeling can affect the final accuracy of orbit, To do that, the following effects were considered in the orbit propagation process: earth oblatness and Sun-Moon attraction.a RINEX(Receiver Independent EXchange) file with navigation data at the 8th of August 2015 was used as an input for an algorithm for determining the GPS satellite position and velocity , the algorithm was implemented using VB.net code with the ability of determining the position and velocity of any GPS satellite within the chosen orbit epoch of the used RINEX navigation file , in order to yield conclusive results about the position and velocity accuracy, a NGA(National Geospatial-Intelligence Agency) data file for precise GPS satellites positions and velocities at the chosen orbit epoch was used for the algorithm output verification. Numerical application will be given.
[M.E. Awad, R. Ghoneim and Ahmed Adel Ahmed Abd-Elhamed. (2016); ORBIT DETERMINATION MODELING ANALYSIS BY GPS. Int. J. of Adv. Res. 4 (May). 1545-1552] (ISSN 2320-5407). www.journalijar.com
