Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its_______________________?

Due to perturbation of the orbit, satellite orbit parameters are frequ

1.	Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its_______________________?
A.	Six ground stations
B.	Five ground stations
C.	Four ground stations
D.	Three ground stations
Answer» C. Four ground stations

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Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its_______________________?

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