Cheng Xin-mi
Abstract
The article introduces the type of IGS ephemeris,analyzes the accuracy of ultra-rapid precise ephemeris orbit before 24 hours issued by IGS,and shows that the orbit accuracy is equivalent between precise ephemeris in IGU before 6 hours and 24 hours.
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The article introduces the type of IGS ephemeris,analyzes the accuracy of ultra-rapid precise ephemeris orbit before 24 hours issued by IGS,and shows that the orbit accuracy is equivalent between precise ephemeris in IGU before 6 hours and 24 hours.
Key concepts: Ephemeris, Orbit (dynamics), Geodesy, Orbit determination, Geology, Physics, Satellite, Astronomy