Affiliation:
1. Gdynia Maritime University
Abstract
The paper discusses the position of the orbit of PRN11 GPS satellite. Visual analysis of the current GPS
constellation showed considerable deviation of PRN11 GPS satellite orbital parameters relative to other orbital plane
D satellites. Short comparison of available GPS almanac format was included. Two almanacs per year since the launch
of the PRN11 satellites in 1999 were obtained. Parameters of right ascension of ascending node and rate of right
ascension of ascending node were taken into investigation. The results confirmed the fact of constant and progressive
separation of the orbit from home orbital plane D since the very beginning of the satellite mission. The simulation of
long-term persistence of the current trend in the postion of the PRN11 ascending node was presented.
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